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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934

Filed by the Registrant  ☒

Filed by a Party other than the Registrant  ☐

Check the appropriate box:

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Preliminary Proxy Statement

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Confidential, for Use of the Commission Only (as permitted by Rule14a-6(e)(2))

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Definitive Proxy Statement

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Definitive Additional Materials

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Soliciting Material under§240.14a-12 §240.14a-12

Trinseo S.A.PLC

(Name of Registrant as Specified In Its Charter)

(Name (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

☒

☒No fee required.

☐Fee computed on table below per Exchange Act Rules14a-6(i)(1)and 0-11.
(1)

Title of each class of securities to which transaction applies:

(2)

Aggregate number of securities to which transaction applies:

(3)

Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

(4)

Proposed maximum aggregate value of transaction:

(5)

Total fee paid:

☐Fee paid previously with preliminary materials.
☐Check box if any part of the fee is offset as provided by Exchange ActRule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.
(1)

Amount Previously Paid:

(2)

Form, Schedule or Registration Statement No.:

(3)

Filing Party:

(4)

Date Filed:

☐ Fee paid previously with preliminary materials.

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

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Trinseo S.A.​

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ExtraordinaryTrinseo PLC

REGISTERED OFFICE:

Riverside One

Sir John Rogerson’s Quay

Dublin 2

Dublin, Ireland

D02 X576

PRINCIPAL PLACE OF BUSINESS:

440 E. Swedesford Rd., Suite 301

Wayne, Pennsylvania 19087 USA

April 29, 2024

Dear Shareholder:

We cordially invite you to attend our 2024 annual general meeting of shareholders (the “Annual Meeting”) to be held on Wednesday, June 26, 2024 at 11:30 a.m. (local time) at the InterContinental Dublin, located at Simmonscourt Road, Ballsbridge, Dublin, D04 A9K8. Further details regarding admission to the Annual Meeting as well as the business to be conducted at the meeting are more fully described in the accompanying materials.

We describe in detail the actions we expect to take in the attached Notice of the 2024 Annual General Meeting of Shareholders and proxy statement. We have also made available a copy of our Annual Report on Form 10-K for our fiscal year ended December 31, 2023. We encourage you to read the Form 10-K, which includes information on our operations and products, as well as our audited financial statements.

As in previous years, we will be using the “Notice and Access” method of providing proxy materials to shareholders via the Internet. We believe that this process provides shareholders with a convenient and quick way to access the proxy materials and vote, while allowing us to conserve natural resources and reduce the costs of printing and distributing the proxy materials. We will mail to most of our shareholders a Notice of Internet Availability of Proxy Materials for the Annual Meeting containing instructions on how to access our proxy statement and Annual Report and vote electronically via the Internet. Each notice will also contain instructions on how to receive a paper copy of the proxy materials. All shareholders who do not receive a notice will receive a paper copy of the proxy materials by mail or an electronic copy of the proxy materials by email.

Your vote is important regardless of the number of shares you own. Whether or not you plan to attend the Annual Meeting, we encourage you to consider the matters presented in the proxy statement and vote as soon as possible. Instructions for Internet and telephone voting, as well as instructions to request to receive proxy materials by mail, are included with the Notice of Internet Availability of Trinseo’s Proxy Materials for the Annual Meeting. If you are a registered shareholder, you can also request to receive a proxy card and vote by mail.

Sincerely yours,

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Frank A. Bozich

President and Chief Executive Officer

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Trinseo PLC

Annual General Meeting of Shareholders

InterContinental Dublin

Simmonscourt Road

Ballsbridge, Dublin, D04 A9K8

June 26, 2024

Luxembourg, Grand Duchy of Luxembourg11:30 a.m. I.S.T.

November 28, 2017Trinseo PLC

Meeting begins at 5:20 p.m. CEST Doors Open at 5:00 p.m. CEST

Sofitel Luxembourg Europe

4, rue du Fort Niedergrünewald

BP 512 / Quartier Européen NordREGISTERED OFFICE:

L-2015 LuxembourgRiverside One

Grand Duchy of LuxembourgSir John Rogerson’s Quay

Registered office of Trinseo S.A.:Dublin 2

46A avenue John F. Kennedy

L-1855 LuxembourgDublin, Ireland

Grand Duchy of LuxembourgD02 X576

Principal executive offices of Trinseo S.A.PLC

440 E. Swedesford Rd., Suite 301

1000 Chesterbrook Boulevard, Suite 300

Berwyn,Wayne, Pennsylvania 1931219087 USA

(610) 240-3200+1 610-240-3200

NOTICE OF EXTRAORDINARYANNUAL GENERAL MEETING OF SHAREHOLDERS

To the Shareholders of Trinseo S.A.:PLC:

Notice is hereby given that an Extraordinary General Meetingannual general meeting of Shareholdersshareholders (the “Annual Meeting”) of Trinseo S.A.PLC (“we,” “Trinseo” or the “Company”) will be held on Wednesday, June 26, 2024, at 11:30 a.m. Irish Standard Time, at the Sofitel Luxembourg Europe, 4, rue du Fort Niedergrünewald, BP 512 / Quartier Européen Nord,L-2015 Luxembourg, Grand Duchy of Luxembourg on Tuesday, November 28, 2017,InterContinental Dublin, located at 5:20 p.m., local time,Simmonscourt Road, Ballsbridge, Dublin, D04 A9K8, for the purposes described below and in further detail in the proxy statement accompanying this notice:

First, for the purpose of approving an ordinary resolution:

1.To elect, one Class III director, Mr. Henri Steinmetz,by separate resolutions, eleven (11) directors specifically named in the proxy statement, each to serve for a term untilof one year expiring at the 20202025 annual general meetingmeeting;
2.To approve, on an advisory basis, the compensation paid by the Company to its named executive officers;
3.To ratify, by non-binding advisory vote, the appointment of shareholders.PricewaterhouseCoopers LLP (“PwC”) as the Company’s independent registered public accounting firm for the year ending December 31, 2024 and to authorize, by binding vote, the Audit Committee of the Company’s Board of Directors (the “Board”) to set the auditors’ remuneration;
4.To approve a proposal to grant the Board authority to issue shares under Irish law;
5.To approve a proposal to grant the Board authority to opt out of statutory pre-emption rights, with respect to up to a maximum of 10% of issued ordinary share capital, under Irish law;
6.To set the price range for the Company’s re-issuance of treasury shares; and
7.Transacting any other business that may properly come before the Annual Meeting.

Second,All shareholders of record at the close of business on April 29, 2024 (the record date for the purposeAnnual Meeting) may attend.

Beneficial shareholders who held their shares through a broker, bank or other nominee on the record date for the Annual Meeting (“beneficial holders”), who wish to attend the Annual Meeting, must register by going to the Company’s voting website, proxyvote.com, entering their 16-digit control number found on their proxy card or in their Annual Meeting materials, and clicking on the box labeled “Register for Meeting.” Beneficial holders who wish to vote their shares by proxy during the Annual Meeting must obtain a legal proxy, executed in their favor, from their broker, bank or other nominee. Shareholders of approvingrecord who wish to attend the Annual Meeting are also encouraged to register to attend on proxyvote.com, and may vote their shares during the Annual Meeting.

Proposals 1, 2, 3 and 4 are ordinary resolutions requiring either approval of a majority of the votes cast in person or authorizing any other business properly brought beforeby proxy at the Extraordinary GeneralAnnual Meeting, or requiring advisory approval by shareholders which advisory approval will be taken into consideration by the Board. Proposals 5 and 6 are special resolutions requiring approval of Shareholders.at least seventy-five percent (75%) of the votes cast in person or by proxy at the Annual Meeting.

Our Irish statutory financial statements for the fiscal year ended December 31, 2023, including the reports of the directors and statutory auditors thereon, will be presented at the annual general meeting. There is no requirement under Irish law that such statements be approved by the shareholders and no such approval will be sought at the annual general meeting. Our Irish statutory financial statements will be available on our website at investor.trinseo.com/home/financials, under “2023 Financial Statements,” after the date of this proxy statement but no later than June 5, 2024.

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It is expected that thisthe Notice of Extraordinary GeneralAnnual Meeting and this proxy statement will first be available to shareholders on or about October 20, 2017.May 1, 2024. On or about May 1, 2024, the Company will also begin mailing a Notice of Internet Availability of Trinseo’s Proxy Materials to shareholders informing them that this proxy statement and voting instructions are available online. As more fully described in that Notice, all shareholders may choose to access proxy materials on the Internet or may request to receive paper copies of the proxy materials.

Shareholders of record at the close of business on October 17, 2017April 29, 2024 are entitled to notice of, and entitled to vote at, the Extraordinary GeneralAnnual Meeting and any adjournments or postponements thereof. ToWhether or not you expect to attend the Extraordinary GeneralAnnual Meeting, you must demonstrateplease complete, sign, date, and promptly return the enclosed proxy card in the envelope that you were awe or your bank or brokerage firm have provided. Your prompt response will ensure that your ordinary shares of Trinseo shareholder as ofPLC are represented at the close of business on October 17, 2017, or hold a validAnnual Meeting. You can change your vote and revoke your proxy forby following the Extraordinary General Meeting from such a shareholder.procedures described in this proxy statement.

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By Order of the Board of Directors

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Angelo N. Chaclas

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Senior Vice President, Chief Legal Officer,

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Chief Compliance Officer and Corporate Secretary

October 20, 2017

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April 29, 2024

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Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting To Be Held on June 26, 2024: our proxy statement is attached. Financial and other information concerning Trinseo is contained in our Annual Report to shareholders for the fiscal year ended December 31, 2023. The proxy statement and our fiscal 2023 Annual Report to shareholders are available on the Investor Relations section of our website at investor.trinseo.com. Additionally, you may access our proxy materials at proxyvote.com, a site that does not have “cookies” that identify visitors to the site.

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Proxy Statement​

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Proxy Statement

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Questions and Answers About the ExtraordinaryAnnual Meeting and the Proxy Materials

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Proposal 1—Election of Class III Director1

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Corporate Governance

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Board Structure and Committee Composition

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Our Company’s Executive Officers

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Transactions with Related Persons

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Stock Ownership Information

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Section  16(a) Beneficial Ownership Reporting ComplianceSecurities Authorized for Issuance under Equity Compensation Plans

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Delinquent Section 16(a) Reports

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Proposal 2

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Compensation Discussion and Analysis

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Executive Compensation

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Director CompensationPay Versus Performance

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CEO Pay Ratio

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Director Compensation

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Audit Committee Matters

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Proposal 3

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Proposal 4

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Proposal 5

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Proposal 6

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Shareholder Proposals and Director Nominations

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Available InformationHouseholding

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PROXY STATEMENT

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Proxy Statement

OurThe Board of Directors (the “Board”) of Trinseo S.A.PLC solicits your proxy for the Extraordinary GeneralAnnual Meeting of Shareholders (the “Extraordinary Meeting”) to be held on November 28, 2017,June 26, 2024, and at any adjournments or postponements of the ExtraordinaryAnnual Meeting, for the purposes set forth in the Notice of the Extraordinary GeneralAnnual Meeting of Shareholders included in this proxy statement. As

used in this Proxy Statement,proxy statement, the terms “we,” “us,” “our” “Company” or “Trinseo” refer to Trinseo S.A.PLC. Proxy materials, including this Proxy Statementproxy statement and the Annual Report for our fiscal year ended December 31, 2023 (“fiscal 2023”) are being first provided to shareholders on or about October 20, 2017.May 1, 2024. Our registered address is 46A avenueRiverside One, Sir John F. Kennedy,L-1855 Luxembourg, Grand DuchyRogerson’s Quay, Dublin 2, Dublin, Ireland, D02 X576.

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Table of Luxembourg.Contents

QUESTIONS AND ANSWERS ABOUT THE ANNUAL MEETING AND THE PROXY MATERIALS

Questions and Answers about the ExtraordinaryAnnual Meeting and the Proxy Materials

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Where isWhen and where will the ExtraordinaryAnnual Meeting beingbe held?

We will hold the ExtraordinaryAnnual Meeting at 5:20 p.m.11:30 a.m., local timeIrish Standard Time, on Tuesday, November 28, 2017Wednesday, June 26, 2024 at the Sofitel Luxembourg Europe hotelInterContinental Dublin, located at 4, rue du Fort Niedergrünewald, BP 512 / Quartier Européen Nord,L-2015 Luxembourg, Grand DuchySimmonscourt Road, Ballsbridge, Dublin, D04 A9K8.

Beneficial shareholders who held their shares through a broker, bank or other nominee on the record date for the Annual Meeting, who wish to attend the Annual Meeting, must register by going to the Company’s voting website, proxyvote.com, entering their 16-digit control number found on their proxy card or in their Annual Meeting materials, and clicking on the box labeled “Register for Meeting.” Shareholders of Luxembourg. When you arriverecord, who hold their shares through the Company’s transfer agent, and who wish to attend the Annual Meeting are also encouraged to register to attend on proxyvote.com.

In the event it is not possible or advisable to hold the Annual Meeting in person due to unforeseen events, we will announce alternative arrangements for participation at the meeting. Details will be posted in the lobby, check“Investor Relations” section of our website, investor.trinseo.com, and filed with the Securities and Exchange Commission in atadvance of the front deskAnnual Meeting.

Why did I receive a notice in the mail regarding Internet availability of proxy materials instead of a full set of proxy materials?

We provide access to our proxy materials over the Internet. On or about May 1, 2024 we will commence mailing of a Notice of Internet Availability of Proxy Materials to our shareholders of record and askbeneficial owners. The Notice explains how to be directedaccess the proxy materials on the Internet and how to vote your proxy for the Trinseo ExtraordinaryAnnual Meeting. We reserve

If you received the rightNotice by mail and would like to request that you to presentreceive a photo ID and verify your status as a shareholder. We will not permit cameras or other recording devices atprinted copy of our proxy materials, please follow the Extraordinary Meeting. All cell phones must be turned off onceinstructions for requesting printed materials included in the Extraordinary Meeting is convened.Notice.

What will shareholders vote on at the ExtraordinaryAnnual Meeting?

Shareholders will be asked to vote:

1.To elect, one Class III director, Mr. Henri Steinmetz,by separate resolutions, eleven (11) directors specifically named in the proxy statement, each to serve for a term until the 2020 annual general meeting of shareholders; andone year;

2.AnyTo approve, on an advisory basis, the compensation paid by the Company to its named executive officers;
3.To ratify, by non-binding advisory vote, the appointment of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for the year ending December 31, 2024 and to authorize, by binding vote, the Audit Committee of the Board to set its auditors’ remuneration;
4.To approve a proposal to grant the Board authority to issue shares under Irish law;
5.To approve a proposal to grant the Board authority to opt out of statutory pre-emption rights under Irish law;
6.To set the price range for the Company’s re-issuance of treasury shares;
7.To approve transacting any other business that may properly broughtcome before the Extraordinary Meeting of Shareholders.Annual Meeting.

We do not expect any other matters to be presented at the meeting.Annual Meeting. If other matters are properly presented for voting, the persons named as proxies will vote in accordance with their best judgment on those matters.

Who is entitled to vote at the ExtraordinaryAnnual Meeting?

Shareholders of record as of the close of business on October 17, 2017April 29, 2024 are entitled to vote at the ExtraordinaryAnnual Meeting. On that date, there were 43,703,31435,293,759 of our ordinary shares outstanding. Each ordinary share is entitled to one vote.

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QUESTIONS AND ANSWERS ABOUT THE ANNUAL MEETING AND THE PROXY MATERIALS

What is a shareholder of record?

If your shares are registered directly in your name with our transfer agent, American Stock Transfer &Computershare Trust Company, LLC,N.A., you are considered the shareholder of record for those shares. As the shareholder of record, you have the right to vote your shares.

If your shares are held in a stock brokerage account or by a bank, or other holder of record, you are considered the beneficial owner of shares held in street name. Your broker, bank, or other holder of record is the shareholder of record for those shares. As the beneficial owner, you have the right to direct your broker, bank, or other holder of record on how to vote your shares.

What constitutes a quorum for consideration of proposals at the ExtraordinaryAnnual Meeting?

Under our Articles of Association,Constitution, the holders of a majority of the ordinary shares outstanding and entitled to vote at the ExtraordinaryAnnual Meeting shall constitute a quorum for the transaction of business at the ExtraordinaryAnnual Meeting. Ordinary shares represented in person or by proxy will be counted for purposes of determining whether a quorum is present. Abstentions and brokernon-votes (if any) will be treated as present at the ExtraordinaryAnnual Meeting and will be counted for quorum purposes.

How many votes are required to elect directors and to adopt the other proposals at the Extraordinary Meeting to elect the director nominee?

Annual Meeting?

The proposalproposals related to elect the director nominee requiresspecial resolutions to grant the Board authority to opt out of statutory pre-emption rights under Irish law (Proposal 5), and to set the price range for the re-issuance of treasury shares (Proposal 6) require the affirmative vote of three-quarters of the votes cast in person or by proxy at the Annual Meeting. The election of directors and each of the other proposals are ordinary resolutions and require the affirmative vote of a majority of the ordinary shares representedvotes cast in person or by proxy at the ExtraordinaryAnnual Meeting on each resolution. Advisory votes are deemed approved if passed by a majority of votes cast in person or by proxy on the resolution at the Annual Meeting, and entitled to vote.the Board takes the voting results under advisement.

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Voting Item 

Votes Required to
Approve Proposal
(if quorum is
present)

Abstentions and
Broker Non-Votes

1. Election of Directors

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2017Majority of Votes Cast. Votes cast “for” must exceed the votes cast “against”

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Not counted as votes cast and therefore have no effect

2. Approval of Executive Compensation

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Majority of Votes Cast. Proposal is deemed approved if votes “for” exceed votes cast “against.” The Board takes the voting results under advisement

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Not counted as votes cast and therefore have no effect

3. Appointment of PwC as independent registered public accounting firm and authorization of the Audit Committee to set auditors’ remuneration

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Majority of Votes Cast. Votes cast “for” must exceed the votes cast “against”. The Board takes the voting results with respect to the appointment of PwC under advisement

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Abstentions are not counted as votes cast and therefore have no effect; brokers may vote without instruction

4. Approval of Board Authority to Issue Shares

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Majority of Votes Cast. Votes cast “for” must exceed the votes cast “against”

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Abstentions are not counted as votes cast and therefore have no effect; brokers may vote without instruction

5. Approval of Board Authority to Opt Out of Statutory Pre-emption Rights

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75% of the Votes Cast: Votes cast “for” must meet or exceed 75% of total votes cast

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Abstentions are not counted as votes cast and therefore have no effect; brokers may vote without instruction

6. To set the price range for re-issuance of treasury shares

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75% of the Votes Cast: Votes cast “for” must meet or exceed 75% of total votes cast

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Abstentions are not counted as votes cast and therefore have no effect; brokers may vote without instruction

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What happens if I abstain from voting on a matter, or my broker withholds my vote?

For all proposals, Irish law provides that ordinary shares represented at the meeting and abstaining from voting will count as shares present at the meeting for the

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QUESTIONS AND ANSWERS ABOUT THE EXTRAORDINARYANNUAL MEETING AND THE PROXY MATERIALS

purpose of determining whether there is a quorum, but will not count for the purpose of determining the number of votes cast.

A broker non-vote occurs when a broker does not have discretion to vote on a particular non-routine proposal and the broker has not received instructions from their customers as to how to vote on such proposal. Such broker non-votes are not considered as votes cast on such non-routine proposal, which has the effect of reducing the number of affirmative votes needed to approve the proposal. Brokers are permitted to vote your shares on Proposal 3 (Ratification of the Appointment of the Independent Registered Public Accounting Firm and Authorization of the Audit Committee of the Board to Set Auditors’ Remuneration), Proposal 4 (Approval of Board Authority to Issue Shares), Proposal 5 (Approval of Board Authority to Opt Out of Statutory Pre-emption Rights), and Proposal 6 (To set the price range for re-issuance of treasury shares).

How do I vote?

If you are a shareholder of record, you may vote in person atyour shares during the meeting.Annual Meeting. If you do not wish to vote in personduring the meeting or if you will not be attending the meeting,Annual Meeting, you may vote by telephone, or over the Internet, by following the instructions provided on yourin the Notice of Internet Availability of Proxy Materials. If you requested a printed copy of the proxy card. Youmaterials, you may also complete, sign, and date your proxy card and return it in the prepaid envelope that was included with the printed materials.

Beneficial shareholders who held their shares through a broker, bank or other nominee on the record date, who wish to vote their shares by proxy during the Annual Meeting must obtain a legal proxy, executed in their favor, from their broker, bank or other nominee.

If you are a beneficial owner of sharesholder and you wish to vote in person at the Extraordinary Meeting, you must obtain a proxy from your broker, bank, or other shareholder of record and present it to the inspector of election with your ballot. If you do not wish to vote in person or will not be attendingduring the Extraordinary Meeting,meeting, you may vote by following the proxy voting instructions provided within the proxy materialsNotice of Internet Availability of Proxy Materials you received from the shareholder of record of your shares. If you receivedrequested a printed copy of the proxy materials, you should have received a proxyvoting instruction card and voting instructions from the shareholder of record of your shares.

If you are a shareholder of record and submit a signed proxy card for the ExtraordinaryAnnual Meeting but do not fill out the voting instructions, the persons named as proxy holders will vote the shares represented by your proxy as follows: (1) “FOR” authorizing the Company, with approvalelection of eleven (11) directors specifically named in the Board, to elect one Class III director, Mr. Henri Steinmetz,proxy statement, each to serve for a term untilof one year expiring at the 20202025 annual general meetingmeeting; (2) “FOR” the proposal regarding advisory approval of shareholders.

If there are not sufficient votesthe compensation paid by the Company to approveits named executive officers; (3) “FOR” ratification of the Proposal at the Extraordinary Meeting, in accordance withappointment of PwC to be the Company’s Articlesindependent registered public accounting firm for the year ending December 31, 2024, and authorization of Association, the chairman may adjourn the Extraordinary Meeting to permit the further solicitationAudit

Committee of proxies. Additionally, under Luxembourg law, the Board may adjournto set the Extraordinary Meeting forauditors’ remuneration; (4) “FOR” approval of Board authority to issue shares under Irish law; (5) “FOR” approval of Board authority to opt out of statutory pre-emption rights, with respect to up to four weeks. The persons named as proxies will vote those proxies for such adjournment, unless marked to be voted against the Proposal, to permit the further solicitation10% of proxies. Abstentionsissued ordinary share capital, under Irish law; and brokernon-votes, if any, will not have any effect on the result(6) “FOR” approval of the voteprice range for adjournment. If any nominee should become unavailable, your shares will be voted for another nominee selected by the Board or for only the remaining nominees.re-issuing treasury shares.

Brokers are not permitted to vote your shares on the Proposal. If your shares are held in the name of a broker or nominee and you do not instruct the broker or nominee how to vote with respect to the election of directors or if you abstain or withhold authority to vote on any matter, your shares will not be counted as having been voted on those matters, but will be counted as in attendance at the meeting for purposes of a quorum.

If you do not vote your shares, you will not have a say on the important proposalissues to be voted upon at the ExtraordinaryAnnual Meeting.

What happens if I abstain from voting or my broker withholds my vote?

For the proposal to be considered at the meeting, abstentions are treated as shares that are represented and entitled to vote, so abstaining has the same effect as a negative vote. Shares held by brokers that do not have discretionary authority to vote on the proposal and that have not received voting instructions from their customers are not counted as being represented or entitled to vote on the proposal, which has the effect of reducing the number of affirmative votes needed to approve the proposal.

Should I submit a proxy even if I plan to attend the Extraordinary Meeting in person?

Annual Meeting?

To ensure that your vote is recorded promptly, please vote as soon as possible, even if you plan to attend the Extraordinary Meeting in person.Annual Meeting. If you attend the Extraordinary Meeting in person and are a shareholder of record and plan to attend the Annual Meeting, you may also submit your vote in person,during the meeting, and any previous votes that you submitted will be superseded by the vote that you cast atduring the ExtraordinaryAnnual Meeting. Internet and phone voting will becut-off cut off at 11:59 p.m., Eastern Time, on November 27, 2017.Monday, June 24, 2024.

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QUESTIONS AND ANSWERS ABOUT THE ANNUAL MEETING AND THE PROXY MATERIALS

Can I revoke my proxy?

If you are a shareholder of record, meaning your shares are registered directly in your name with our transfer agent, Computershare Trust Company, N.A., as of the record date for the Annual Meeting (and not in the name of a bank, broker or other nominee), then your proxy may be revoked by taking any of the following actions:

●by giving notice of revocation to our Corporate Secretary in writing c/o Trinseo PLC, Riverside One, Sir John Rogerson’s Quay, Dublin 2, Dublin, D02 X576, Ireland (Attention: Corporate Secretary), which notice must be received before the commencement of the Annual Meeting;
●by executing and mailing to the Company a later-dated proxy, to be received no later than 11:59 p.m., Eastern Time, on Monday, June 24, 2024;
●by accessing the Internet site or by using the toll-free telephone number (in each case by no later than 11:59 p.m., Eastern Time, on Monday, June 24, 2024), or
●if you attend the Annual Meeting in person, by submitting a new poll card during the Annual Meeting.

Beneficial holders who hold their shares through a bank, broker or other nominee may revoke their proxy or change their vote by executing and returning to the Company a later-dated proxy, submitting a later-dated electronic vote through the Internet site or by using the toll-free telephone number (in each case by no later than 11:59 p.m., Eastern Time, on Monday, June 24, 2024).

The Internet and telephone procedures for voting and for revoking or changing a vote are designed to authenticate shareholders’ identities, to allow shareholders to give their voting instructions and to confirm that shareholders’ instructions have been properly recorded.

Who will bear the cost of soliciting votes for the ExtraordinaryAnnual Meeting?

We will bear the expense of the solicitation of proxies for the ExtraordinaryAnnual Meeting. Solicitation of proxies may be made by mail, in person or telephone by officers, directors and other employees of the Company and by employeesCompany. We have not hired a solicitor to aid in the solicitation of Broadridge Financial Solutions, Inc. (“Broadridge”). proxies.

We will reimburse Broadridge and the Company’s banks, brokers, and other custodians, nominees and fiduciaries for their reasonable costs in the preparation and mailing of proxy materials to shareholders.

A shareholder may also choose to vote electronically by accessing the Internet site stated on their proxy card or proxy voting instructionsthe Notice of Internet Availability or by using the toll-free telephone number provided in in its proxy card or proxy voting instructions.stated on the Notice of Internet Availability. Shareholders that vote through the Internet should understand that there may be costs associated with electronic access, such as usage charges from Internet access providers and telephone companies, which will be borne by the shareholder.

Can I revoke my proxy?​

Your proxy may be revoked by giving notice of revocation to Trinseo in writing, by accessing the Internet site, by using the​

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QUESTIONS AND ANSWERS ABOUT THE EXTRAORDINARY MEETING AND THE PROXY MATERIALS

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toll-free telephone number, or in person at the Extraordinary Meeting. A shareholder may also change his or her vote by executing and returning to the Company a later-dated proxy, by submitting a later-dated electronic vote through the Internet site, by using the toll-free telephone number or in person at the applicable Extraordinary Meeting.

PROPOSAL 1

The Internet and telephone procedures for voting and for revoking or changing a vote are designed to authenticate shareholders’ identities, to allow shareholders to give their voting instructions and to confirm that shareholders’ instructions have been properly recorded.

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PROPOSAL 1—ELECTION OF CLASS III DIRECTOR

Proposal 1—Election of Class III DirectorDirectors

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Trinseo has a classified boardTrinseo’s Board currently consists of directors currently consisting of threeeleven directors with one-year terms expiring in 2018 (Class I), three2024. Trinseo’s Board was resized to eleven directors with terms expiring in 2019 (Class II), and two directors with terms expiring in 2020 (Class III). At eachfollowing the Company’s 2023 annual general meetingmeeting.

Each of shareholders,the directors in one class are elected for a fullan annual term of three years to succeed those directors whose terms are expiring.

The Class III director nominee, Mr. Henri Steinmetz, will stand for election to serve for a term expiringuntil close of business at the 2020next annual general meeting. The persons named in the enclosed proxy will vote to elect Mr.K’Lynne Johnson, Joseph Alvarado, Frank Bozich, Victoria Brifo, Jeffrey Cote, Pierre-Marie De Leener, Jeanmarie Desmond, Matthew Farrell, Sandra Beach Lin, Henri Steinmetz and Mark Tomkins as directors unless the proxyProxy is marked otherwise. Mr. SteinmetzEach of the nominees has indicated his or her willingness to serve, if elected. However, if Mr. Steinmetza nominee should be unable to serve, the ordinary shares represented by proxies may be voted for a substitute nominee designated by the

Board. Management has no reason to believe that Mr. Steinmetzany of the above-mentioned persons will not serve his or her term as a director.

2024 Director Nominees

The individuals listed below have been nominated and are standing for election at this year’s Annual Meeting. If elected, they will hold office until our 2025 annual general meeting of shareholders and until their successors are duly elected and qualified. Each of the nominees in this proposal was previously elected to the Board by shareholders. Each of the nominees will cease to be directors if their respective appointments are not approved by a majority of the votes cast by our shareholders.

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Director Nominee Skills

The following table highlights certain skills, knowledge and experience held by each current Director nominee. A particular Director may possess other skills, knowledge or experience even though they are not indicated below.

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Director Nominee

Served 
Since

Chemicals
Industry 
Experience

Manufacturing/ 
Related Industry 
Experience

Chief
Executive 
Experience

Accounting 
and Financial
Experience

Public 
Company
Board 
Experience

K’Lynne Johnson

​

2017

​

✓

​

✓

​

✓

​

​

​

✓

​

Joseph Alvarado

​

2017

​

​

​

✓

​

✓

​

✓

​

✓

​

Frank Bozich

​

2019

​

✓

​

✓

​

✓

​

​

​

✓

​

Victoria Brifo

​

2021

​

✓

​

✓

​

​

​

​

​

​

​

Jeffrey J. Cote

​

2014

​

​

​

✓

​

✓

​

✓

​

✓

​

Pierre-Marie De Leener

​

2014

​

✓

​

​

​

✓

​

✓

​

​

​

Jeanmarie Desmond

​

2020

​

✓

​

✓

​

​

​

✓

​

✓

​

Matthew Farrell

​

2020

​

✓

​

✓

​

✓

​

✓

​

✓

​

Sandra Beach Lin

​

2019

​

✓

​

✓

​

✓

​

​

​

✓

​

Henri Steinmetz

​

2017

​

✓

​

✓

​

✓

​

​

​

​

​

Mark Tomkins

​

2019

​

✓

​

✓

​

​

​

✓

​

✓

​

​

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Board Commitment to Diversity

We seek nominees from diverse backgrounds with established strong professional reputations, sophistication, business acumen and experience in the global materials, chemical and related manufacturing industries. We also seek nominees with experience in

substantive areas that are important to our business such as chemical industry expertise,expertise; international operations; accounting, finance and capital structure; strategic planning and operational leadership of complex organizations;organizations human resources and development practices; and innovation. In addition, we believe that our nominees should possess the professional and personal qualifications necessary for board service, and we have highlighted particularly noteworthy attributes in each of the biographies of our directors and our nomineenominees below. Thirty-six percent (36%) of our director nominees are

Mr. Steinmetzwomen, and two of our nominees self-identify as a member of an underrepresented minority group (meaning an individual who self-identifies as Black or African American, Hispanic or Latinx, Asian, Native American or Alaska Native, Native Hawaiian or Pacific Islander). Two of our nominees are non-U.S. citizens and two maintain dual citizenship. On average the term of service of our director nominees is a new director nominee nominated byapproximately five (5) years, and more than half of our nominees have served on the Board to fillfor less than five years.

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The election of each director requires the seat vacated by Jeannot Krecké and is standing for election at this Extraordinary General Meeting. If elected, he will hold office until our 2020 annual general meetingapproval of shareholders and until his successor is duly elected and qualified. Mr. Steinmetz offers our Board decades of experience in the chemical industry as well as a global perspective and significant chief executive officer experience. Mr. Steinmetz will not be able to serve as a director unless his appointment is approved by a majority of the votes castshares represented in person or by our shareholders.

YOUR BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT YOU VOTE “FOR”

THE ELECTION OF HENRI STEINMETZ AS A CLASS III DIRECTOR.

proxy at the Annual Meeting. Broker non-votes will have no effect on the outcome of this proposal.

THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT YOU VOTE “FOR”
THE ELECTION OF EACH OF THE NOMINEES AS DIRECTOR.

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2024 Director Nominee with Term Expiring in 2020 (Class III Director)

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HENRI STEINMETZK’lynne Johnson

Age: 5561

Director Since: March 2017

Committee Membership:

·

Compensation and Talent Development

·

Nominating & Corporate Governance

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Professional Experience:

Since 2016 Mr. Steinmetz hasMs. Johnson served as Chief Executive Officer of the Ceramtec Group, a global supplier of advanced ceramics. From 2009 to 2016, Mr. Steinmetz was Executive DirectorPresident and Chief Executive Officer of Ruetgers N.V.Elevance Renewable Sciences Inc., Europe’s leadinga specialty chemicals company, from 2007 to 2015, and as Chairwoman from 2015 to 2016. Ms. Johnson joined Elevance after over 20 years’ experience working within the oil and petrochemicals industry for Amoco Corporation and BP p.l.c. (joining BP after its merger with Amoco in 1998). During this time she held both operational and functional roles, culminating in her role as Senior Vice President of Global Derivatives within BP’s global Innovene business, which included P&L accountability for multiple global commodity and specialty chemicals businesses. Ms. Johnson also served as director of TPC Group, a manufacturer of chemicalproducts derived from petrochemical raw materials, made from coal tar. Prior2011 to joining Ruetgers N.V., Mr. Steinmetz2012 before the company was President of Sulzer Metco, a worldwide technology leader in coating materials, from 2004 to 2008, and an Executive Vice President at Great Lakes Chemical Corporation from 2000 to 2004.taken private.

Education:

Mr. SteinmetzMs. Johnson graduated from Brigham Young University with a M.S.degree in metallurgy from the Technical University Clausthal, GermanyManagement and has an MBA from INSEAD Fontainebleau, France.Organizational Behavior (M.O.B.) and a B.S. in Psychology.

Other Public Company Directorships:

NoneCurrent Directorships—

FMC Corporation (NYSE: FMC) since 2013

Director Qualifications:

Mr. Steinmetz has significant global chief executive officerMs. Johnson brings to our Board valuable experience in operational leadership and decades of chemical industry experience, which make him well-positioned to provide significant contributions to our Board.and technological expertise.

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JOSEPH ALVARADOJoseph Alvarado

Age: 7165

Director Since:March 2017

Committee Membership:

•    Audit·

•    Environmental, Health, SafetyCompensation and Talent Development (Chair)

·

Nominating & Public PolicyCorporate Governance

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Professional Experience:

Mr. Alvarado is Chairman andserved as Chief Executive Officer of Commercial Metals Company (NYSE: CMC), a global manufacturer, recycler and marketer of steel and other metals.metals, from September 2011 until September 2017, and as chairman of CMC’s Board of Directors from January 2013 until January 2018. He joined CMC in April 2010 as Executive Vice President and Chief Operating Officer, was named President and Chief Operating Officer in April 2011, and became President and Chief Executive Officer in September 2011. In January 2017, he passed2011 until his President title to his Chief Operating Officer. He has been Chairman of CMC’s board of directors since January 2013.retirement. Prior to joining CMC, he was President and Chief Operating Officer of Lone Star Technologies, Inc. from 2004 to 2007. In June 2007, following the acquisition of Lone Star Technologies, Inc. by United States Steel Corporation, Mr. Alvarado was named President of U.S. Steel Tubular Products, Inc., a division of United States Steel Corporation, a position he held until March 2009. Mr. Alvarado began his career at Inland Steel Company in 1976 and spent 21 years with the company in roles of increasing responsibility. He then served in executive roles with Birmingham Steel Corporation and Ispat North America Inc. until joining Lone Star Technologies.

Education:

Mr. Alvarado has an MBA from Cornell University and a B.A. degree in Economics from University of Notre Dame.

Other Public Company Directorships:

Commercial Metals CompanyCurrent Directorships—

Kennametal Inc. (NYSE: CMC)KMT) since 2011January 2018

Spectra Energy CorpArcosa, Inc. (NYSE: SE) from 2011 until February 2017ACA) since November 2018

PNC Financial Services Group Inc. (NYSE: PNC) since January 2019

Director Qualifications:

Mr. Alvarado brings to our Board years of experience in a cyclical commodities-driven industry and significant perspective on global manufacturing operations and strategic planning.

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JEFFREY J. COTEFrank A. Bozich

Age: 6350

Director Since: June 2019

Committee Membership:

·

Environmental, Health, Safety, Sustainability & Public Policy

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Professional Experience:

Mr. Bozich became the Company’s President and Chief Executive Officer in March 2019. From May 2013 until February 2019, Mr. Bozich had been the President and Chief Executive Officer at the SI Group, Inc., a leading global developer and manufacturer of phenolic resins and chemicals used in the production of antioxidants, engineering plastics, fuels and lubes, rubber and pharmaceutical ingredients. Prior to SI Group Inc., Mr. Bozich held several executive management positions at BASF Corporation, a multi-national chemicals and manufacturing corporation, including President of BASF’s Catalysts Division from 2010 to 2013, Group Vice President of Precious and Base Metal Service, and Group Vice President of the Integration Management Office. Prior to BASF, Mr. Bozich was Group Vice President, Enterprise Technologies and Ventures at Engelhard Corporation, which was acquired by BASF in 2006. He has also held leadership positions at Rohm and Haas; Croda Adhesives, Inc.; and Apex Adhesives, which he founded in 1986.

Education:

Mr. Bozich holds a bachelor’s degree in Chemistry and a master’s degree in Business Administration from the University of Chicago, as well as a master’s degree in Chemistry from the University of Illinois.

Other Public Company Directorships:

Current Directorships—

OGE Energy Corp (NYSE: OGE) since February 2016

Director Qualifications:

Mr. Bozich is an accomplished CEO known for his strong personal leadership and track record of driving business growth and corporate transformation. His breadth of experience in leading chemical businesses in diverse and dynamic global markets is well-suited for the Company’s strategic priorities.

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Victoria Brifo

Age: 55

Director Since: June 2021

Committee Membership:

·

Compensation and Talent Development

·

Environmental, Health, Safety, Sustainability & Public Policy

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Professional Experience:

Victoria Brifo is Senior Vice President and Chief Human Resources Officer at Air Products and Chemicals, Inc. (NYSE: APD). She is responsible for leading all aspects of the company’s Human Resources (HR) organization, including HR Operations, Diversity and Inclusion, Talent Management, and Compensation and Benefits, as well as Global Health and Wellness, and Corporate Aviation and Corporate Transportation. Ms. Brifo has been with Air Products since 2001, starting as a production site leader and progressing through several plant leadership positions before becoming Global Diversity Director in 2005. In 2008 she was named Global Manager of Electronics Operations and moved to the Merchant Gases group in 2011 to lead the Global Generated Gases business. In 2014 Ms. Brifo assumed the role of Global Transformation Leader for Industrial Gases. She was subsequently appointed Vice President, Global Gases, followed by Vice President, Equipment Sales, Plant Support and Central Procurement. Prior to joining Air Products, Ms. Brifo worked at LyondellBasell and Amoco Production Company.

Education:

Ms. Brifo holds degrees in chemical engineering and political science from the Massachusetts Institute of Technology.

Other Public Company Directorships:

None

Director Qualifications:

Ms. Brifo brings to our Board significant experience in the chemicals and manufacturing industry, as well as leadership, management and human resources expertise.

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Jeffrey J. Cote

Age: 57

Director Since:May 2014

Committee Membership:

•    ·

Audit

•    Compensation·

Nominating & Corporate Governance (Chair)

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Professional Experience:

Mr. Cote has served as the Chief Executive Officer and President of Sensata Technologies Holding plc (NYSE: ST) since March 2020. Prior to his appointment as CEO, Mr. Cote served as President and as Chief Operating Officer of Sensata Technologies Holding N.V. (NYSE: ST) since July 2012 and as Executive Vice President of its Global Sensing Solutions business since November 2015. He joined Sensata as Senior Vice President and Chief Financial Officer in January 2007 and was appointed Executive Vice President in July 2007. From March 2005 to December 2006, Mr. Cote was Chief Operating Officer of the law firm Ropes & Gray. From January 2000 to March 2005, Mr. Cote was Chief Operating, Financial and Administrative Officer of Digitas. Previously he worked for Ernst & Young LLP from 1989 until 1997. Mr. Cote is a certified public accountant.

Education:

Mr. Cote received a B.A. degree in Business Administration and a Master of Accounting from Florida Atlantic University.

Other Public Company Directorships:

NoneCurrent Directorships—

Sensata Technologies Holding plc (NYSE: ST) since March 2020

Director Qualifications:

Mr. Cote brings to our Board significant management, capital marketsfinancial and accounting experience to our Board.experience.

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PIERRE-MARIE DE LEENERPierre-Marie De Leener

Age: 6660

Director Since:May 2014

Committee Membership:

•    Audit·

•    Compensation and Talent Development

·

Environmental, Health, Safety, Sustainability & Public Policy

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Professional Experience:

Mr. De Leener has served as director of Savrola SA since 2013. Mr. De Leener previously served Chairman of the Board of the Flint Group from 2014-2023, and as interim CEO of Braas Monier Building Group SA from January 2016 to November 2016 and has beenas Chairman of its Board of Directors sincefrom June 2014.2014 to March 2017. Prior to that, he served as Executive Vice President for PPG Industries, Inc. from July 2010 until December 2012. From June 2008 until August 2011, Mr. De Leener also served as President of PPG Europe S.A. Mr. De Leener previously servedand as Chief Executive Officer of SigmaKalon Group from 1998 until January 2008. In addition, Mr. De Leener served as a member of the Total Fina operating committee from 1998 until 2001.

Education:

Mr. De Leener received a B.A.B.S. degree in Economics and Philosophy and a MasterMasters of Chemical Engineering degree from Catholic University of Louvain, Belgium.

Other Public Company Directorships:

None

Director Qualifications:

Mr. De Leener brings to our Board valuable executive management and chemical industry experience to our Board.experience.

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PHILIP MARTENSJeanmarie Desmond

Age: 5757

Director Since:September 2016 October 2020

Committee Membership:

•    Compensation·

•    NominatingAudit

·

Environmental, Health, Safety, Sustainability & Corporate GovernancePublic Policy

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Professional Experience:

From February 2011Ms. Desmond is the former Executive Vice President and Chief Financial Officer of DuPont de Nemours, Inc. and has previously served as Vice President and Co-Controller for DowDuPont and as finance leader for the Specialty Products division following the merger of DuPont with Dow Chemical. Ms. Desmond served in various leadership roles within DuPont in her 30-year career with the company including Vice President - Controller, General Auditor and Chief Ethics & Compliance Leader and Director- Investor Relations.

Education:

Ms. Desmond received a B.S. in Accounting from Mt. St. Mary’s University and is a certified public accountant (inactive).

Other Public Company Directorships:

Current Directorships—

IPG Photogenics Corporation (Nasdaq: IPGP) since 2021

Sylvamo (NYSE: SLVM) since 2021

Director Qualifications:

Ms. Desmond brings to April 2015, our Board substantial finance and accounting experience and extensive experience in the chemicals industry.

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Matthew Farrell

Age: 67

Director Since: November 2020

Committee Membership:

·

Audit

·

Compensation and Talent Development

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Professional Experience:

Mr. Martens served asFarrell is the Chairman, President and Chief Executive Officer of Novelis,Church & Dwight Co. Inc. (“Church & Dwight”), a leader in aluminum rolled productsserving as CEO since 2016 and can recycling with worldwide operations. He joined Novelis as Chairman since 2019. Mr. Farrell served as Executive Vice President, Chief Financial Officer and Chief Operating Officer in April 2009.at Church & Dwight since 2014, and as Chief Financial Officer since 2006. Prior to his employment with Novelis,that, Mr. MartensFarrell served as SeniorChief Financial Officer of Alpharma Inc., as Vice President, of light vehicle systems for ArvinMeritorInvestor Relations & Communications at Ingersoll-Rand Ltd., and in various senior financial positions at AlliedSignal Inc., a distributor for engine and transmission parts and President and Chief Executive Officer designate of Arvin Innovation, a leading global provider of dynamic motion and control automotive systems. From 1987 to 2005, Mr. Martens held various product development and engineering roles at Ford Motor Company, includingFarrell began his most recent role as a group vice president of product creation from 2003 to 2005.career with KPMG Peat Marwick LLP, where he was an audit partner.

Education:

Mr. Martens has an MBA from University of Michigan andFarrell received hisa B.S. degree in mechanical engineering from Virginia Polytechnic Institute.Manhattan College and is a certified public accountant (inactive).

Other Public Company Directorships:

Graphic Packaging Holding CompanyCurrent Directorships—

Church & Dwight Co. Inc. (NYSE: GPK)CHD) since 20132019

Plexus Corporation (NASDAQ: PLXS)Past Directorships—

Lydall Co., Inc. (NYSE: LDL) from 2010 until February 20172003 to 2021

Director Qualifications:

Mr. MartensFarrell brings to the board of directors significant leadershipour Board his experience as a chief executive officer, substantial financial and managementaudit expertise and experience in global manufacturing operations, along with innovation expertise.the chemicals, industrial goods and consumer products industries.

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CHRISTOPHER D. PAPPASSandra Beach Lin

Age: 6662

Director Since:October 2010 November 2019

Committee Membership:

•    Environmental, Health, Safety & Public Policy

Professional Experience:

Mr. Pappas joined Trinseo as President and Chief Executive Officer in June 2010 and served as interim chief financial officer from November 2015 until June 2016. Prior to joining Trinseo, Mr. Pappas held a number of executive positions at NOVA Chemicals of increasing responsibility from July 2000 to November 2009, most recently as President and Chief Executive Officer from May 2009 to November 2009, President & Chief Operations Officer from October 2006 to April 2009 and Vice President and President of Styrenics from July 2000 to September 2006. Before joining NOVA Chemicals, Mr. Pappas was Commercial Vice President of DuPont Dow Elastomers where he joined as Vice President of ethylene elastomers in 1995. Mr. Pappas began his chemicals career in 1978 with The Dow Chemical Company (“Dow”) where he held various sales and managerial positions until 1995.

Education:

Mr. Pappas holds a B.S. degree in Civil Engineering from the Georgia Institute of Technology and an MBA from the Wharton School of Business at The University of Pennsylvania.

Other Public Company Directorships:

FirstEnergy Corp. (NYSE: FE) since 2011

Univar, Inc. (NYSE: UNVR) since 2015

Director Qualifications:

Mr. Pappas is highly qualified to serve on our Board due to his public company board experience and his more than 30 years of management experience with major companies in the chemical industry, and by his leadership of the Company since its formation. In these roles he has also acquired and demonstrated substantial financial expertise which is valuable to the Company’s Board.

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STEPHEN M. ZIDE

·

Age:57

Chairman Director Since:June 2010

Committee Membership:

•    Compensation

•    Nominating & Corporate Governance

·

Environmental, Health, Safety, Sustainability & Public Policy (Chair)

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Professional Experience:

Mr. Zide is a senior advisorFrom 2010 to Bain Capital in the private equity business, having joined the firm in 1997. From 2001 through 2015, Mr. Zide2011, Ms. Beach Lin was a Managing Director of Bain Capital. Prior to joining Bain Capital, Mr. Zide was a partner of the law firm of Kirkland & Ellis LLP, where he was a founding member of the New York office and specialized in representing private equity and venture capital firms.

Education:

Mr. Zide received an MBA from Harvard Business School, a Juris Doctorate from Boston University School of Law, and a B.A. degree from the University of Rochester.

Other Public Company Directorships:

Sensata Technologies B.V. (NYSE: ST) since 2010

HD Supply Holdings, Inc. (NASDAQ: HDS) from 2007 to 2014

Innophos Holdings, Inc. (NASDAQ: IPHS) from 2004 to 2013

Director Qualifications:

Mr. Zide brings to the Board extensive negotiating and financing expertise gained from his training and experience as a legal advisor, and later as a private equity professional and financial advisor. In addition, Mr. Zide has had significant involvement with the Company since its 2010 formation, and has served as a director of numerous public and private companies during his career in private equity and law.

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K’LYNNE JOHNSON

Age:49

Director Since:March 2017

Committee Membership:

•    Compensation

•    Nominating & Corporate Governance

Professional Experience:

Ms. Johnson served as President and Chief Executive Officer of Elevance Renewable SciencesCalisolar, Inc., a manufacturer of solar silicon and multicrystalline solar cells. Prior to joining Calisolar, she was Executive Vice President, then Corporate Executive Vice President, at Celanese Corporation, a global technology and specialty chemicalsmaterials company, from 2007 to 2015, and2010. Ms. Beach Lin joined Avery Dennison Corporation, a global leader in pressure-sensitive adhesives technology as Chairwoman from 2015 to 2016. Ms. Johnson joined Elevance after over 20 years’ experience working within the oil and petrochemicals industry for Amoco Corporation and BP p.l.c. (joining BP after its merger with Amoco in 1998). During this time she held both operational and functional roles, culminating in her role as SeniorGroup Vice President from 2005 to 2007. Prior to joining Avery Dennison, from 2002 to 2005 she was President, Alcoa Closure Systems International, a division of Global Derivatives within BP’sAlcoa Incorporated, a global Innovene business, which included P&L accountability for multiple global commodity and specialty chemicals businesses.aluminum leader. From 1994 to 2001, Ms. Beach Lin held various executive positions at Honeywell International.

Education:

Ms. JohnsonBeach Lin graduated from Brigham Young University with a degreeBBA in General Management from the University of Toledo and Organizational Behavior (M.O.B.)has an MBA in Marketing and a B.S. in Psychology.Policy and Control from the University of Michigan.

Other Public Company Directorships:

FMC CorporationCurrent Directorships—

American Electric Power (NYSE: FMC)AEP) since 2012

Avient Corp. (NYSE: AVNT) since 2013

Past Directorships—

WESCO International (NYSE: WCC) from 2002 to 2019

Director Qualifications:

Ms. JohnsonBeach Lin brings to our board valuableBoard her experience as a chief executive officer and extensive experience in operational leadership and chemical industry expertise.the global specialty chemicals industry.

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DONALD T. MISHEFFHenri Steinmetz

Age: 6761

Director Since:February 2015 November 2017

Committee Membership:

•    ·

Audit

•    Nominating·

Environmental, Health, Safety, Sustainability & Corporate GovernancePublic Policy

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Professional Experience:

From 2016 to 2018, Mr. MisheffSteinmetz served as managing partner from 2003 until his retirement in 2011Chief Executive Officer of the Northeast Ohio officesCeramtec Group, a global supplier of Ernst & Young LLP,advanced ceramics. From 2009 to 2016, Mr. Steinmetz was Executive Director and Chief Executive Officer of Ruetgers N.V., Europe’s leading manufacturer of chemical raw materials made from coal tar. Prior to joining Ruetgers, Mr. Steinmetz was President of Sulzer Metco, a public accounting firm. As the managing partnerworldwide technology leader in coating materials, from 2004 to 2008, and was an Executive Vice President at Great Lakes Chemical Corporation from 2000 to 2004. Mr. Steinmetz currently serves as Chairman of the Northeast Ohio offices of Ernst & Young LLP, Mr. Misheff advised many of the region’s largest companies on financial and corporate governance issues. He began his career with Ernst & Young LLP in 1978 as part of the audit staff and later joined the tax practice, specializing in accounting/financial reporting for income taxes, purchase accounting, and mergers and acquisitions. He has more than 30 years of experience performing, reviewing, and overseeing the audits of financial statements of a wide range of public companies.Benteler International AG.

Education:

Mr. MisheffSteinmetz graduated with a M.S. in metallurgy from the Technical University of Akron with a B.S. degree in Accounting.Clausthal, Germany and has an MBA from INSEAD Fontainebleau, France.

Other Public Company Directorships:

TimkenSteel Corporation (NYSE: TMST) since 2014

First Energy Corp. (NYSE: FE) since 2012None

Director Qualifications:

Mr. MisheffSteinmetz brings extensiveto our Board significant global chief executive officer experience and decades of chemical industry experience.

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Mark Tomkins

Age: 68

Director Since: November 2019

Committee Membership:

·

Audit (Chair)

·

Nominating & Corporate Governance

​

Professional Experience:

From 2005 to 2006, Mr. Tomkins was Senior Vice President and Chief Financial Officer of Innovene, at the time, a leading petrochemical and polymers company. Prior to joining Innovene, Mr. Tomkins was Senior Vice President, Chief Financial Officer and Treasurer of Vulcan Materials, a building materials and chemical company, from 2001 to 2005. He joined Great Lakes Chemical Corp., a specialty chemicals company as Senior Vice President and Chief Financial Officer from 1998 to 2001. Prior to Great Lakes Chemical, Mr. Tomkins was Vice President of Finance and Business Development for Polymers and Vice President of Finance and Business Development for Electronic Materials at Allied Signal (now Honeywell International). Mr. Tomkins’ previous experience includes service as a director of CVR Energy, Inc., a publicly traded company primarily engaged in petroleum refining and nitrogen fertilizer manufacturing, from 2007 to 2012, a as a director of WR Grace & Co., a publicly traded specialty chemicals company from 2006 to 2021, as a director of Terminix Global Holdings (formerly Service Master Holdings), a publicly traded home and commercial services business from 2015 to 2021, as well as a director of private companies in the energy and plastics sectors.

Education:

Mr. Tomkins graduated with a B.S. in Finance and Quantitative Management and an MBA from Eastern Illinois University and is a certified public accountant (inactive).

Other Public Company Directorships:

Current Directorships—

None

Past Directorships—

Terminix Global Holdings (NYSE: TMX) from 2015 to 2021

WR Grace & Co. (NYSE: GRA) from 2006 to 2021

Director Qualifications:

Mr. Tomkins brings to our Board significant financial, accounting and management expertise, along with extensive experience on other public and private company corporate governance experience to our Board.boards.

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Corporate Governance

Board Nominees.Nominees Under its charter, our nominating and corporate governance committee is responsible for recommending to the Board candidates to stand for election to the Board at the Company’s annual general meeting of shareholders and for recommending candidates to fill vacancies on the Board that may occur between annual general meetings. It is the policy of the Board that directors should possess the highest personal and professional ethics, integrity and values. Board members are expected to become and remain informed about the Company, its business and its industry and rigorously prepare for, attend and participate in all Board and applicable committee meetings. The committee evaluates each individual in the context of the Board as a whole, with the objective of recommending a group that can best perpetuate the success of our business and represent shareholdershareholders’ interests through the exercise of sound judgment using its diversity of experience. In addition, the Board considers, in light of our business and Board composition, each director nominee’s experience, qualifications, attributes and skills that are identified in the biographical information contained under “Proposal 1—ElectionProposal 1.

Recommendation of Class III Director.”

Board Candidates The nominating and corporate governance committee considers properly submitted recommendations for candidates to the Board from shareholders. Any shareholder may submit in writing nominations of persons for consideration for each shareholder meeting at which directors are to be elected by not later than the 90th calendar day nor earlier than the 120th calendar day before the date of the annual general meeting. Any shareholder recommendations for consideration by the Board should include the candidate’s name, biographical information, information regarding any relationships between the candidate and the shareholder within the last three years, a statement of recommendation of the candidate from the shareholder, a description of our shares beneficially owned by the shareholder, a description of all arrangements between the candidate and the recommending shareholder and any other person pursuant to which the candidate is being recommended, a written indication of the candidate’s willingness to serve on the Board, of Directors, any other information required to be provided under securities laws and regulations, and a written indication to provide such other information as the Board may reasonably request. Recommendations should be sent to Angelo N. Chaclas, Corporate Secretary, Trinseo S.A., 1000 Chesterbrook Boulevard,PLC, 440 East Swedesford Road, Suite 300, Berwyn,301, Wayne, PA 19312.19087. The Board evaluates candidates for the position of director recommended by shareholders or others in the same manner as candidates from other sources. The Board will determine whether to interview any candidates and may seek additional information about candidates from third-party sources.

The As part of its ongoing succession planning, the Company has engaged an executive search firmseeks to identify potential Board nominees on behalf of the Board. The executive search firm is instructed to identify candidates meetingBoard that meet the Board’s desiresrequirements with respect to diversity, experience, skill, and qualifications and perform preliminary screenings of such candidates on behalfqualifications.

Shareholder Board Nominees Shareholders who wish to nominate one or more persons for election as a director of the Board. The Company at an annual general meeting of shareholders, and who wish the nomination to be included in the proxy materials for that meeting pursuant to Rule 14a-8 under the Securities Exchange Act of 1934, must follow the requirements set forth in this proxy statement under “Shareholder Proposals & Director Nominations.” Shareholder director nominations must comply with the deadlines and other requirements in Article 101 of our Constitution, including the applicable notice, information and consent provisions.

Board specifically requested the executive search firm identify at least one candidate who was a Luxembourg resident. Mr. Steinmetz is a Luxembourg resident.

Board Independence.Independence Our Corporate Governance Guidelines provide that our Board shall consist of such number of directors who are independent as is required and determined in accordance with applicable laws and regulations and requirements of the NYSE. The Board evaluates any relationships of each director and nominee with Trinseo and makes an affirmative determination whether or not such director or nominee is independent. Under our Corporate Governance Guidelines, an “independent” director is one who meets the qualification requirements for being an independent director under applicable laws and the corporate governance listing standards of the NYSE. Our Board reviews any transactions and relationships between each director or any member of his or her immediate family and Trinseo. The purpose of this review is to determine whether there were any such relationships or transactions and, if so, whether they were inconsistent with a determination that the director was independent. The Company maintains a related party transactions policy and conflict of interest policy, as discussed below under “Related Party Transactions.” As a result of thisits review, our Board has affirmatively determined that all of our current directors and nominees, except for Mr. Pappas,our CEO and President, Frank Bozich, are independent under the governance and listing standards of the NYSE.

Diversity and Board Expertise. While we do not have a formal policy with respect to diversity, weExpertise We believe that the diversity considerations are an important element, among many, when identifying director nominees who will best serve the needs of the Company and the interests of our shareholders. We believeThese diversity considerations enable us to provide sound and prudent guidance by developing a Board with a diverse range of talents, ages, skills, character, expertise, professional experiences, and backgrounds.

Risk Oversight.Oversight Risk is inherent in every material business activity that we undertake. Our business exposes us to strategic, credit, market, compliance, operational and reputational risks. To support our corporate goals and objectives, risk appetite, and business and risk strategies, we maintain a governance structure that delineates the responsibilities for risk management activities, and the governance and oversight of those activities, between management and our Board. The Board is committed to

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strong, independent oversight of management and risk through a governance structure that includes other Board committees. Under our structure, it is management’s responsibility to manage risk and bring to the Board’s attention risks that are material to Trinseo. The Board has oversight responsibility for the systems established to report and monitor the most significant risks applicable to Trinseo. The Board administers its risk oversight role directly and through its committee structure and the committees’ regular reports to the Board at Board meetings. The Board divides its risk oversight

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responsibilities between itself and its committees by having each review or assess key issues or areas of responsibility as follows:

Board of Directors

•    ·

Strategic, financial, and execution risks and exposures associated with our annual and multi-year business plans

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•    Acquisitions and divestures

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Capital expenditure and budget planning

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Major litigation, investigations, and other matters that present material risk to our operations, plans, prospects, or reputation

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•    AcquisitionsReview of enterprise risk management including cybersecurity and divesturesinformation security risk oversight

•    Senior management succession planning

Audit Committee

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Risks associated with financial accounting matters, including financial reporting, accounting, disclosure, and internal controls over financial reporting

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•    Supervision and selection of our external and internal auditors

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Our ethics and compliance programs

•    Related party transactions

Compensation and Talent Development Committee

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Risks related to the design of our executive compensation programs, plans, and arrangements

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Senior management succession planning

Nominating and Corporate Governance Committee

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•    Risks related to our governance structures and processes

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Director succession planning

Environmental, Health, Safety, Sustainability and Public Policy Committee

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Our environmental, health and safety risk management programs

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•    The alignment of our environmental, health, safety, sustainability, social and public policy program with the Company’s business strategy and creation of stakeholder value

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Board Leadership Structure.Structure Under our Corporate Governance Guidelines, our Board may select a Chairman of the Board of DirectorsChair at any time, who may also be an executive officer of the Company. The Board has currently chosen to separate the roles of ChairmanBoard Chair and Chief Executive Officer. Mr. Zide, our currentnon-executive Chairman ofOfficer, which the Board of Directors, has served as a director since 2010 and brings to the Board extensive knowledge and expertise in strategy, mergers and acquisitions. The Board believes that the separate roles of Mr. Zide and Mr. Pappas, our Chief Executive Officer, areis currently in the best interest of Trinseo and its shareholders, at this time. Mr. Zide hasin-depth knowledge of our business arising from his many years of service to Trinseo and, as a result, provides effective leadership for the Board and support for Mr. Pappas and other management. Theshareholders. This structure permits Mr. Pappasour Chief Executive Officer to devote his attention to leading Trinseo and to executing on our business strategy.

Ms. Johnson is our current non-executive Board Chair and has served as a director since 2017. Ms. Johnson brings significant experience as Chair, including, but not limited to: (i) entrepreneurial and senior public company experience; (ii) expertise in environmental, social and governance issues; and (iii) strategic transformation experience. Ms. Johnson has significant experience in the specialty chemical industry and as a public company director. As described above, the Board has determined that Ms. Johnson meets the definition of an independent director under NYSE listing standards. The nominating and corporate governance committee will recommend adjustments to committee assignments to the Board as it deems necessary during the year.

Board Attendance.Attendance We expect our boardBoard members to prepare for, attend, and participate in all boardBoard and applicable committee meetings. Our Board held 7nine meetings in 2016.2023. The audit, compensation and talent development, and nominating and corporate governance committees held 9, 5,nine, seven and 4five meetings in 2016,2023, respectively. No Board member attended less than 75% of our board andBoard or committee meetings, as applicable, in 2016.2023.

We do not have a policy for the attendance of our directors at our annual general meeting of shareholders. We had twoIn 2023, eleven directors in attendance for our 2016 annual general meeting of shareholders for whichand no shareholders attended. Under Luxembourg law we are required to receive notice by the meeting’s record date of a shareholder’s intention to attend the annual general meeting of shareholders in person. Additionally,attended our annual general meetingmeeting. Eligible shareholders were permitted to attend in person by registering on our voting website. Notwithstanding any extenuating circumstances which would impact the safety of shareholders, unless there is an exceptional circumstance, areattendees, this year’s Annual Meeting will be held in Luxembourg.person, using the same registration method for shareholders who wish to attend. There will not be a teleconference or video conference option.

Executive Sessions.Sessions Our Corporate Governance Guidelines provide that thenon-management directors of the Board meet in executive session at least once during each regularly scheduled Board meeting to review matters concerning the

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relationship of the Board with the managementexecutive directors and other members of senior management, and such other matters as it deems appropriate. Additionally, the Board is required to have least one executive session annually of its independent directors. Mr. ZideMs. Johnson acts as the chair of these executive sessions.

Board Annual Performance Reviews.Reviews Pursuant to our Corporate Governance Guidelines the Board annually conducts a self-evaluation of the Board as a whole. In accordance with the written charters of our audit, committee, compensation committee

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and talent development, and nominating and corporate governance committees, each committee we also evaluate each committee’sevaluates its performance on an annual basis and reportreports its findings to the Board the findings.Board.

Code of Business Conduct.Conduct We have adopted a written Code of Business Conduct applicable to all directors, officers and employees and a written Code of Ethics for Senior Financial Employees, applicable to our Chief Executive Officer, Chief Financial Officer, Treasurer, Principal Accounting Officer, Controller, and all employees performing similar functions. These policies are designed to maintain the integrity of our business and financial reporting. These codes cover, among other things, professional conduct, conflicts of interest, accurate recordkeeping and reporting, public communications and the protection of confidential information, as well as adherence to laws and regulations applicable to the conduct of our business. Copies of these codes can be found under the “Corporate Governance”“Governance” tab and then the “Ethics and Compliance” link on the Investor Relations section of our website,www.investor.trinseo.cominvestor.trinseo.com. by selecting the “Ethics and Compliance” link and then “supporting policies.”

Corporate Governance Guidelines.Guidelines We have adopted Corporate Governance Guidelines that outline the Board’s governance policies and practices. The current version of our Corporate Governance Guidelines can be found under the “Corporate Governance”“Governance” tab and then the “Ethics and Compliance” link on the Investor Relations section of our website,www.investor.trinseo.com.investor.trinseo.com by selecting the “Ethics and Compliance” link and then “supporting policies.”

Communications with Directors.Directors Shareholders and other interested parties may communicate directly with the Board, thenon-management directors or the independent directors as a group, or specified individual directors, by writing to such individual or group c/o Corporate Secretary, Trinseo S.A., 1000 Chesterbrook, Boulevard,PLC, 440 East Swedesford Road, Suite 300, Berwyn,301, Wayne, PA 19312.19087. The Corporate Secretary will forward such communications to the relevant group or individual at or prior to the next meeting of the Board. The Board has instructed our Corporate Secretary to review the correspondence prior to forwarding it and in hisuse discretion to not to forward certain items if he deems themdeemed to be of a commercial or frivolous nature or otherwise inappropriate for the Board’s consideration. In these cases, hethe Corporate Secretary may forward some of the correspondence elsewhere in the Company for review and possible response.

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BOARD STRUCTURE AND COMMITTEE COMPOSITION

Board Structure and Committee Composition

We have a standing audit committee, compensation committee and atalent development committee, nominating and corporate governance committee, and an environmental, health, safety, sustainability and public policy committee with the composition and responsibilities described below. Each committee operates under a charter that has been approved by our Board of Directors.Board. A copy of each charter can be found by clicking on “Corporate Governance”“Governance” and then “Committee Composition” in the Investor Relations section of our website,www.investor.trinseo.cominvestor.trinseo.com. The members of each committee are appointed by the Board of Directors and each member serves until his or her successor is elected and qualified, unless he or she is earlier removed or resigns. In addition, from time to time, special committees may be established under the direction of the Board of Directors when necessary to address specific issues.

The table below provides information about the membership of our standing audit, compensation and talent development, nominating and corporate governance and our and environmental, health, safety, sustainability and public policy committees during fiscal 2016:

Name

  Audit  Compensation  Nominating
and Corporate
Governance		 

Jeffrey J. Cote

   X*   X(1)  

Pierre-Marie De Leener

   X   

Philip R. Martens

    X(2)   X(2) 

Donald T. Misheff

   X    X(1) 

Christopher D. Pappas

     X* 

Michel G. Plantevin

    X  

Stephen M. Zide

       X*   X 

2023:

*

Name

Audit

Compensation and
Talent Development

Nominating and
Corporate Governance

Environmental, Health,
Safety, Sustainability
and Public Policy

K’Lynne Johnson †

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✓

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Joseph Alvarado

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Chair

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✓

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Frank Bozich

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✓

Victoria Brifo

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✓

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✓

Jeffrey J. Cote §

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✓

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Chair*

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Pierre-Marie De Leener

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✓

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✓

Jeanmarie Desmond §

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✓

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✓

Matthew Farrell §

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✓

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✓

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Sandra Beach Lin

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✓

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Chair

Henri Steinmetz

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✓

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✓

Mark Tomkins §

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Chair

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✓

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†Denotes Board Chair

(1)

§

Mr. Cote and Mr. Misheff were appointed as members of our compensation and nominating and corporate governance committees, respectively, effective March 30, 2016.

Denotes Audit Committee Financial Expert

*Since June 2023.

(2)Mr. Martens was appointed as a member of our compensation and nominating and corporate governance committees on September 27, 2016.

Audit Committee

The purpose of the audit committee is set forth in the audit committee charter. The audit committee’s primary duties and responsibilities are to:

●Appoint or replace, compensate and oversee the outside auditors for the purpose of preparing or issuing an audit report or related work or performing other audit, review or attest services for us and to report directly to the audit committee.
●Pre-approve all auditing services and permitted non-audit services (including the fees and terms thereof) to be performed for us by our outside auditors, which are approved by the audit committee prior to the completion of the audit.
●Review and discuss with management and the outside auditors the annual audited and quarterly unaudited financial statements, our disclosures under “Management’s Discussion and Analysis of Financial Condition and Results of Operations”, and the selection, application and disclosure of critical accounting policies and practices used in such financial statements.
●Review and approve all related party transactions as defined under Item 404(a) of Regulation S-K.
●Discuss with management and the outside auditors significant financial reporting issues and judgments made in connection with the preparation of our financial statements, including any significant changes in our selection or application of accounting principles, any major issues as to the adequacy of our internal controls and any special steps adopted in light of material control deficiencies.

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Table of preparing or issuing an audit report or related work or performing other audit, review or attest services for us and will report directly to the audit committee.Contents

BOARD STRUCTURE AND COMMITTEE COMPOSITION

Pre-approve all auditing services and permittednon-audit services (including the fees and terms thereof) to be performed for us by our outside auditors, which are approved by the audit committee prior to the completion of the audit.

Review and discuss with management and the outside auditors the annual audited and quarterly unaudited financial statements, our disclosures under “Management’s Discussion and Analysis of Financial Condition and Results of Operations”, and the selection, application and disclosure of critical accounting policies and practices used in such financial statements.

Review and approve all related party transactions as defined under Item 404(a) ofRegulation S-K.

Discuss with management and the outside auditors significant financial reporting issues and judgments made in connection with the preparation of our financial statements, including any significant changes in our selection or application of accounting principles, any major issues as to the adequacy of our internal controls and any special steps adopted in light of material control deficiencies.

A copy of the charter, which satisfies the applicable standards of the Securities and Exchange Commission (the “SEC”)SEC and the NYSE is available on our website. The audit committee currently consists of Donald T. Misheff, Joseph Alvarado, Jeffrey J. Cote, Jeanmarie Desmond, Matthew Farrell, Henri Steinmetz and Pierre-Marie De Leener.Mark Tomkins. Our Board has determined that Ms. Desmond and each of Messrs. Misheff, Cote, Farrell, Steinmetz and De LeenerTomkins are independent directors pursuant to Rule 10A-3(b)(1) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and Section 303A.02 of the New York Stock Exchange Listed Company Manual. EachMs. Desmond and each of Messrs. MisheffCote, Farrell and CoteTomkins is also an “audit committee financial expert” within the meaning of Item 407(d)(5) ofRegulation S-K. Mr. CoteTomkins serves as chair of the audit committee.

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BOARD STRUCTURE AND COMMITTEE COMPOSITION

Compensation & Talent Development Committee

The purpose of the compensation and talent development committee (the “compensation committee”) is to assist the Board in fulfilling its responsibilities relating to oversight of the compensation of our directors, executive officers and other employees and the administration of our benefits and equity-based compensation programs. The compensation committee reviews and recommends to our Board compensation plans, policies and programs and approves specific compensation levels for all executive officers. The compensation committee currently consists of Jeffrey J. Cote,Joseph Alvarado, Victoria Brifo, Pierre-Marie De Leener, Matthew Farrell and K’Lynne Johnson, Philip R. Martens, and Stephen M. Zide. Messrs. Cote and Martens and Ms. Johnson joined the compensation committee in March 2016, September 2016, and April 2017, respectively.Johnson. Mr. ZideAlvarado serves as chair of the compensation committee. A copy of itsthe compensation committee’s charter, which satisfies the applicable standards of the SEC and the NYSE, is available on our website. Pursuant to its charter, the compensation committee may delegate to subcommittees of the compensation committee any of the responsibilities of the full committee.

Nominating and Corporate Governance Committee

The purpose of the nominating and corporate governance committee is to (i) identify, screen and review individuals qualified to serve as directors (consistent with criteria approved by our Board) and recommend to our Board candidates for nomination for election at theour annual meeting of shareholders or to fill Board vacancies or newly created directorships; (ii) develop and recommend to our Board and oversee the implementation of our corporate governance guidelines; (iii) oversee evaluations of our Board and (iv) recommend to our Board candidates for appointment to boardBoard committees. The committee also reviews the outcome of shareholder engagement. The nominating and corporate governance committee currently consists of Joseph Alvarado, Jeffrey J. Cote, K’Lynne Johnson, Philip R. Martens, Donald T. Misheff,Sandra Beach Lin and Stephen M. Zide. Messrs. Misheff and Martens joined the nominating and corporate governance committee in March 2016 and September 2016, respectively. Ms. Johnson joined the nominating and corporate governance committee in April 2017.Mark Tomkins. Mr. MisheffCote serves as chair of the nominating and corporate governance committee. Our Board has adopted a written charter under which the nominating and corporate governance committee operates. A copy of the charteroperates, which is available on our website.

Environmental, Health, Safety, Sustainability and Public Policy Committee

The Environmental, Health, Safety, Sustainability and Public Policy Committee (the “EHSS&PP committee”) was established for the purpose of assisting the Board in fulfilling its oversight responsibilities by assessing the effectiveness of programs and initiatives that support the environment, health and safety, sustainability, corporate social responsibility and climate change (“Sustainability”) policies and programs of the Company. Its duties and responsibilities are to:

●Support alignment between the Company and the Board on the Company’s Sustainability, social, and public policy goals;
●Guide the Company on its Sustainability programs, policies, partnerships, activities and goals to ensure consistency with and impact upon the Company’s business strategy and the creation of stakeholder value and relationships;
●Review of external public policy/governmental affairs issues and trends in order to more effectively achieve the Company’s business goals, and provide recommendations to the Board regarding the Company’s response to these issues consistent with applicable legal and regulatory requirements;
●Review, approve and recommend to the Board for adoption, the Company’s annual public Sustainability and Corporate Social Responsibility Report; and
●Assist the Board in fulfilling its oversight responsibility for the Company’s risk management programs by assessing risks that may arise in connection with the Company’s Sustainability, programs, partnerships, activities and goals.

The EHSS&PP committee currently consists of Frank A. Bozich, Victoria Brifo, Pierre-Marie De Leener, Jeanmarie Desmond, Sandra Beach Lin and Henri Steinmetz. Ms. Beach Lin serves as chair of the EHSS&PP committee. A copy of its charter is available on the Company’s website.

Compensation Committee Interlocks and Insider Participation

None of our executive officers serves as a member of the board of directorsBoard or the compensation committee of any other company that has any executive officers serving as a member of our Board or compensation committee.

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EXECUTIVE OFFICERS

Our Company’s Executive Officers

Biographical information concerning our President and Chief Executive Officer, Christopher D. Pappas,Frank A. Bozich, who also serves asis a member ofnominee to our board of directors,Board, is set forth above under Proposal 1—Election of Class III Director.1.

Barry J. NiziolekDavid Stasse,Executive Vice President and Chief Financial OfficerOfficer.. Mr. Niziolek,Stasse, age 61, became53, has served as the Company’s Executive Vice President and Chief Financial Officer since July 2019. Mr. Stasse joined the Company in June 2016. From September 2006 through August 2015, Mr. Niziolek was aJuly 2013 as Vice President and Controller at E.I. DuPont de Nemours & Company (“DuPont”)Treasurer with responsibility for all treasury matters, including cash management, risk management, relationships with rating agencies and commercial banks, and financing matters. During his tenure he added responsibility for Investor Relations and Corporate Finance for the Company. Prior to joining Trinseo, Mr. Stasse was employed by Freescale Semiconductor, Inc., a global semiconductor manufacturer that served the automotive, networking, consumer and industrial markets, where he was responsible for the company’s accounting controls, financial reporting, and financial planning and analysis. During his 34 years at DuPont, he held a wide range of finance roles, includingserved as chief financial officer for the titanium and coatings businesses, as well as chief financial officer for the crop protection business. At DuPont, Mr. Niziolek acquired substantial experience in finance leadership, governance and compliance, board interactions, mergers and acquisitions, risk management, capital structure, corporate planning, new business development, and investor relations. Mr. Niziolek began his career at KPMG, where he was a senior auditor. Mr. Niziolek has a bachelor of science degree in accounting from Wilkes University and his MBA from University of Delaware. He is a certified public accountant.

Timothy M. Stedman, Senior Vice President and Business President, Feedstocks, Plastics and Global Integrated Business Services.Treasurer from 2008 to 2013. Mr. Stedman, age 47, joined the Company as Senior Vice President and Business President, Basic Plastics & Feedstocks,Stasse holds an MBA in November 2015. In this role, he was responsible for business leadership for polystyrene,co-polymers, polycarbonate, and styrene monomer. In his current role, which began in October 2017, Mr. Stedman also became responsible for the Company’s performance plastics business. As part of his role, he serves as a member of the operating committee of the Plastics Division of the American Chemistry Council. Prior to joining the Company, Mr. Stedman spent more than 20 years with ExxonMobil Chemical working in the U.K., the U.S., and Belgium. Most recently, Mr. Stedman was the Europe Business Director for ExxonMobil Chemical’s Basic Chemicals business, and prior to that was the Site Manager for the Fife Ethylene Plant (steam cracker) in Scotland. Stedman also led Global Sales and Marketing organizations for several ExxonMobil Chemical’s Polymers and Intermediates businesses, including the Santoprene business that was formally part of the Advanced Elastomers Systems joint venture with Monsanto. Mr. Stedman served on the boards of Petrochemicals Europe and the European Petrochemical Association until September 2015 and was also a member of the Energy and Climate Change Leadership Group of the International Council of Chemical Associations (ICCA). Mr. Stedman holds a degree in Chemical EngineeringFinance from the University of Manchester InstituteMaryland and a Bachelor of Science and Technology, U.K., and the Ecole Nationale Supérieure des Industries Chimiques, Nancy, France. He is also a Chartered Engineer and a Fellow of the Institute of Chemical Engineers (U.K.).

Hayati Yarkadas, Senior Vice President and Business President, Latex Binders, Synthetic Rubber and Global Procurement. Mr. Yarkadas, age 49, joined the Company in November 2015 to lead the rubber, latex, and performance plastics businesses. Since October 2017, Mr. Yarkadas now leads the latex binders and synthetic rubber businesses, along with the global procurement function and leadership of the Asia Pacific region. Mr. Yarkadas has more than 20 years of experience in the materials business. From July 2013 to November 2015, Mr. Yarkadas led the food ingredient business of Tate & Lyle in Europe as Senior Vice President and General Manager, based in London. Prior to that, Mr. Yarkadas spent over 17 years with DuPont in many of its worldwide locations. Most recently Mr. Yarkadas served as General Manager of the DuPont Teijin Films joint venture from May 2009 to May 2013. Previously, he was Global Business Director for DuPont Advanced Glass Interlayers and held a series of roles in sales, sales management, Six Sigma, marketing, product management and business management in plastics and chemicals. Throughout his career, Mr. Yarkadas gained significant operating and global leadership skills with various roles in Turkey, the U.K., Switzerland, the U.S., and Luxembourg. Mr. Yarkadas has a master’s degree in Mechanical EngineeringBusiness Logistics from Istanbul Technical University and an MBA from Imperial College London.Penn State University.

Angelo N. Chaclas,Senior Vice President, Chief Legal Officer, Chief Compliance Officer and Corporate Secretary. Mr. Chaclas, age 54,60, has been the Company’s Chief Legal Officer, Senior Vice President, and Corporate Secretary since January 2015. Mr. Chaclas also became the Chief Compliance Officer in June 2018. In his role, he provides legal support for all capital markets, transactional, compliance, commercial, litigation, regulatory, governance, intellectual property and other operational activities of the Company worldwide. Mr. Chaclas joined the Company in 2010 as Associate General Counsel and Chief Intellectual Property Counsel, where he managed the Company’s global intellectual property portfolio and supportedmanaged the legal activities of several of the Company’s commercial businesses. Prior to joining the Company in 2010, Mr. Chaclas was Deputy General Counselbusinesses and Chief Counsel for the software division of Pitney Bowes where he led its Intellectual Property, Technology Law and Procurement legalcorporate functions. Mr. Chaclas holds a bachelor’s degree in Mechanical Engineering from Tufts University and a Juris Doctorate from Pace University.

Marilyn N. Horner,Paula Cooney, Senior Vice President—President and Chief Human Resources.Resources Officer. Ms. Horner,Cooney, age 59,55, joined the Company as Senior Vice President, of Human Resources in January 2011.November 2021. Prior to joining the Company,Trinseo, Ms. Horner held a number of executive positions at NOVA

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OUR COMPANY’S EXECUTIVE OFFICERS

Chemicals where she started her career in 1988. She served as theCooney was Senior Vice President and Chief Human Resources OfficerCHRO for NOVA Chemicals from 2008 to December 2010.FLIR Systems, Inc. where she provided strategic direction as the company’s human resources leader. Before FLIR Systems, Inc., Ms. Horner also held the positions of Vice President Finance and Controller, Olefins / Polyolefins Division;Cooney served as Vice President, Human Resources and Organizational Effectiveness;Communications for H.B. Fuller Company, where she worked for 10 years and held multiple roles in HR leadership. Prior to joining H.B. Fuller in 2010, Ms. Cooney enjoyed a nearly 15-year career at Intel Corporation, holding HR roles of increasing responsibility. Ms. Cooney holds an NCEA diploma in personnel management from the National College of Ireland, and a Master pf Business Studies in human resources and industrial relations from University College Dublin (Smurfit School of Business).

Johanna Frisch, Vice President and Treasurer. Ms. Frisch, age 45, was named Vice President and Treasurer in January 2022. Previously, Ms. Frisch served as the Company’s Global Assistant Treasurer and in various roles of increasing responsibility within the Company’s Treasury department starting in 2010. Prior to joining Trinseo, Ms. Frisch served as Treasurer of Nycomed Pharmaceutical Company from 2008-2010, and prior to that held several analyst positions for The Dow Chemical Company. Ms. Frisch holds a B.S. degree in international business management from University of Maryland University College, Schwaebisch Gmuend/Germany.

Roger Greene, Vice President, Controller and Principal Accounting Officer. Mr. Greene, age 48, joined the Company in September 2023. Mr. Greene served as Vice President, Chief Audit Executive of Corteva Agriscience leading the internal audit function. Mr. Greene also served as Global Business Controller for the Agriculture Division of DuPont from 2016 to 2019, and held leadership roles in DuPont’s corporate accounting and controllership groups. Before joining DuPont, Mr. Greene worked at PricewaterhouseCoopers in its Assurance practice. Mr. Greene holds a bachelor’s degree in accounting from Pennsylvania State University and is a Certified Public Accountant.

Han Hendriks, Senior Vice President, Chief Technology Officer. Ms. Horner Mr. Hendriks, age 58, was appointed as Chief Technology Officer in October 2022. In his role, Hendriks leads the development of differentiated technology and innovation across the organization. Prior to joining Trinseo, Mr. Hendriks was Chief Technology Officer at Yanfeng, one of the world’s leading automotive suppliers, headquartered in Shanghai. Mr. Hendriks was responsible for the company’s technology and “smart cabin” vision and strategy, as well as portfolio management, and led the design and development of new products from research to market launch. Prior to Yanfeng, Mr. Hendriks worked for Johnson Controls, holding multiple roles of increasing responsibility. Mr. Hendriks holds a Bachelor of Commerce degreeFine Arts in Architectural Design from the Academy of Fine Arts in Maastricht and an MBA from the University of WindsorWestminster, London, and he successfully completed a post-graduate Industrial Design program at the Università Internazionale Dell ‘Arte in Ontario, Canada.Florence.

E. Jeffery Denton,Arthas Yang, Senior Vice President—CorporatePresident, Latex Binders. Mr. Yang, age 41, was appointed as Senior Vice President, Latex Binders in March 2024, after having served as the Global Business Director for the CASE business of Latex Binders. Mr. Yang joined Trinseo in June 2010 following the Company’s carve-out from The Dow Chemical Company. During his tenure, Mr. Yang has held multiple key positions within the Company, including Technical Service & Development Leader, Product Manager, Marketing Manager, and Regional Commercial Director, for businesses including Latex Binders, Engineered Materials, and the former synthetic rubber division. Mr. Yang holds a Masters in Materials Science and Bachelor of Physics from Tsinghua University, and a Master of Business Administration from Shanghai Jiao Tong Hong Kong University of Science and Technology.

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EXECUTIVE OFFICERS

Francesca Reverberi, Senior Vice President, Engineered Materials and Chief Sustainability Officer. Ms. Reverberi, age 52, was named Senior Vice President and Chief Sustainability Officer in September 2021. Reverberi also assumed leadership of Engineered Materials in August 2023, a position she has previously held. Previously, Ms. Reverberi served as Senior Vice President, Engineered Materials & Synthetic Rubber, with responsibility for the Automotive, Consumer Electronics, Medical, Sheet & Extrusion, and Building & Construction plastics markets as well as the global synthetic rubber business. Ms. Reverberi also served as Global Business Director of Performance Plastics, Business Director of Basic Plastics and prior to that, Global Business Director for Synthetic Rubber. Ms. Reverberi joined Trinseo in June 2011 following the Company’s carve-out from The Dow Chemical Company. During her time at Dow, Ms. Reverberi served as Product Director for Emulsion Polymers, Europe and the Americas, as well as Commercial Manager in Dow Hydrocarbons Aromatics and Derivatives in Europe, including responsibilities for the C4’s business and held several positions in other specialty businesses such as Water Solutions and Chelants. Ms. Reverberi holds a Bachelor and Master of Science in Chemical Engineering from Politecnico di Milano and a Master of Business Administration from SDA Bocconi.

Rainer Schewe, Senior Vice President—Supply Chain & Manufacturing Services. Mr. Denton,Schewe, age 52, joined the Company as Vice President—Shared Services and Feedstocks in June 2010 and was named Vice President—Corporate Development and Business Services in October 2014, and subsequently Senior Vice President in October 2015. Mr. Denton is responsible for the Company’s Information Technology and Corporate Development functions. He previously served in a similar role at the Company (when it was a division of Dow) from September 2009 until June 2010 and as the Director of Joint Venture Implementation at Dow from February 2006 until September 2009. Mr. Denton received a bachelor’s degree in Business Administration from Alma College.

Catherine C. Maxey,Vice President—Public Affairs, Sustainability and Environment, Health and Safety. Ms. Maxey, age 51, joined the Company as Vice President—Public Affairs and Business Intelligence in June 2010. Previously she held positions of increasing responsibility at Dow, which she joined in 1988, most recently as Public Affairs director for Mergers & Acquisitions, Joint Ventures, Dow Portfolio Optimization/Divestitures and Manufacturing and Engineering from March 2009 until June 2010. She also served as Dow’s Business Public Affairs Director for Performance Chemicals from 2003 to June 2008. Ms. Maxey received a bachelor’s degree in Journalism/Science Writing from Lehigh University.

David P. Stasse, Vice President—Treasury and Corporate Finance. Mr. Stasse, age 47,60, joined the Company in July 2013April 2020 as Vice President—Supply Chain Services, and assumed responsibility for Manufacturing Services in March 2024. Prior to joining Trinseo, Mr. Schewe served as Executive Vice President and Treasurer with responsibilityChief Supply Chain Officer for all treasury and investor relations matters, including cash management, risk management, relationships with rating agencies and commercial banks, and financing matters. Mr. Stasse joined the Company from Freescale Semiconductor,A. Schulman, Inc., a global semiconductor manufacturer that serves the automotive, networking, consumer and industrial markets, where (now LyondellBasell Industries). Prior to this role, he served as Vice President and Treasurer since July 2008, and Assistant Treasurer from August 2006 to July 2008.Business Unit Director for Schulman’s Custom Performance Colors business in EMEA. Mr. StasseSchewe holds a degree as a State-Certified Engineer in Chemical Engineering from Fresenius Akademie Wiesbaden in Germany, and an Apprenticeship as a Chemical Laboratory Technician from RWTH Aachen in Germany.

Bregje Roseboom-Van Kessel, Senior Vice President, Plastics Solutions and Polystyrene & Feedstocks. Ms. van Kessel, age 47, was appointed Senior Vice President, Base Plastics in November 2022 and assumed leadership of Trinseo’s Polystyrene & Feedstocks business in August 2023. Ms. van Kessel joined Trinseo in 2018 and previously served as Senior Director, Global Business Finance, where she led the business finance organization for all of Trinseo’s external reporting segments. Ms. van Kessel brings over 20 years of experience in business finance and change management and has held key financial leadership roles supporting global sales and marketing, supply chain, R&D and brand development for global markets. Ms. van Kessel holds a master’s degree in medicine and an executive MBA in Financefinance and control from the University of MarylandMaastricht University. She is a registered controller and a Bachelormember of Science degree in Business Logistics from Penn State University.the Chartered Institute of Management Accountants.

Diversity of Executive Officers

Similar to our Board diversity, the Company believes a broad range of backgrounds and personal experience help the Company operate, strategize and solve problems more effectively. We believe our executive officers reflect this diversity of viewpoints and backgrounds. Four of our executive officers are women, one self-identifies as a member of an underrepresented minority group, and five are non-U.S. citizens.

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Charts do not include our CEO and President, Frank Bozich, who is reflected in the Board diversity discussion.

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TRANSACTIONS WITH RELATED PERSONS

Table of Contents

EXECUTIVE OFFICERS

Transactions with Related Persons

Certain Relationships and Related Transactions

Our Conflict of Interest Policy is designed to help our directors, executive officers, and employees address situations that may involve a conflict of interest, which may include related party transactions. These include situations in which an individual’s personal interests are in conflict with the interests of the Company; situations in which an individual or family member receives personal benefits as a result of his or her position with the Company; and situations that may otherwise cast doubt on his or her ability to act objectively with or on behalf of the Company. The Company annually surveys our executive officers and directors regarding potential conflicts of interest. If such conflicts are reported or found, the Legal Department and/or our Chief Compliance Officer will seek to mitigate or eliminate such potential or actual conflictconflicts of interest.

Our audit committee charter requires that the audit committee review and approve all related party transactions. The Company also has a written related parties policy.Related Party Transactions Policy. When related party transactions between us and our officers, directors and principal shareholders and their affiliates, are approved by the audit committee, it does so with the understanding that the terms of such transaction are no less favorable to us than those that we could obtain from unaffiliated third parties.

Share Repurchase and Secondary Offerings​

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On March 24, 2016, our former Parent, Bain Capital Everest Manager Holding SCA, sold an aggregate of 10,600,000 of our ordinary shares in a registered, underwritten public offering to Goldman, Sachs & Co. (the “Underwriter”). Concurrent with that offering, the Company repurchased a total of 1,600,000 of our ordinary shares from the Underwriter at a price of $35.63 per share, the same price per share paid by the Underwriter. As a result of the share repurchase, our former Parent received approximately $57,008,000 in proceeds from the Company. Five of our directors at that time, Messrs. Zide, Thomas, Plantevin, Hauser, and Vasseur, were affiliated with our former Parent. Therefore, the decision to repurchase 1,600,000 of our shares at $35.63 was delegated to a committee of disinterested directors consisting of our audit committee members.

During the year ended December 31, 2016, our former Parent also sold 37,269,567 ordinary shares pursuant to the Company’s shelf registration statement filed with the SEC. In connection with these secondary offerings, the Company incurred advisory, accounting, legal and printing expenses on behalf of the former Parent of $2.5 million during the year ended December 31, 2016. The Company was obligated to pay these expenses under a June 17, 2010 registration rights agreement entered into with our former Parent at the time of our Company’s formation. These expenses were included within “Selling, general and administrative expenses” in the Company’s 2016 consolidated statement of operations contained in its 2016 Annual Report onForm 10-K. During the period of these transactions, six of our directors, Messrs. Zide, Thomas, Plantevin, Hauser and Vasseur and Ms. Springham, were affiliated with our former Parent.

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STOCK OWNERSHIP INFORMATION

Stock Ownership Information

STOCK OWNERSHIP INFORMATION

The following table sets forth information regarding the beneficial ownership of our ordinary shares, nominal value $0.01, as of October 17, 2017March 31, 2024 by:

each person or group of affiliated persons known by us to be the beneficial owner of more than 5% of our ordinary shares;

each of our named executive officers, director nominees and directors; and

●each person or group of affiliated persons known by us to be the beneficial owner of more than 5% of our ordinary shares;
●each of our named executive officers, directors and director nominees; and
●all of our directors, director nominees and executive officers as a group.

As of October 17, 2017,March 31, 2024, we had 43,703,31435,293,759 ordinary shares outstanding (excluding treasury shares), all of which were held by public investors (including certain of our directors and executive officers), the details of which are reflected in the table below.

Information with respect to beneficial ownership has been furnished by each director, director nominee, executive officer or beneficial owner of more than 5% of our ordinary shares. We have determined beneficial ownership in accordance with SEC rules. These rules generally attribute beneficial ownership of shares to persons who possess sole or shared voting or investment power with respect to such shares. The information does not necessarily indicate beneficial ownership for any other purpose. Under these rules, the number of ordinary shares deemed outstanding includes shares issuable upon exercise of options and held by the respective person or group which may be exercised or converted within 60 days after October 17, 2017.March 31, 2024. These shares are deemed to be outstanding and beneficially owned by the person holding those options for the purpose of computing the percentage ownership of that person or entity, but they are not treated as outstanding for the purpose of computing the percentage ownership of any other person or entity. Mr. Pugh has been excluded from the table since he is no longer required to file reports with the SEC for all of his equity transactions due to his March 1, 2017 retirement. As of March 1, 2017, Mr. Pugh held 83,880 shares, which included 56,151 vested options.

Unless otherwise indicated below, the address for each listed director, director nominee, officer and shareholder is c/o Trinseo S.A., 1000 Chesterbrook Boulevard, Suite 300, Berwyn, Pennsylvania 19312. The inclusion in the following table of those shares, however, does not constitute an admission that the named shareholder is a direct or indirect beneficial owner. Unless otherwise indicated and subject to applicable community property laws, to our knowledge, each shareholder named in the following table possesses sole voting and investment power over the shares listed, except for those jointly owned with that person’s spouse.

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Total

    

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Of Number of Shares Beneficially 

​

​

Number of Shares

​

Percent

​

Owned, Shares which May be 

Name

​

Beneficially Owned

​

of Class (1)

​

Acquired within 60 Days (2)

M&G Investment Management Limited (3)

 

7,625,044

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21.6%

​

—

BlackRock, Inc. (4)

 

2,638,164

​

7.5%

​

—

Frank A. Bozich

 

340,360

​

*

​

217,879

David Stasse

 

176,426

​

*

​

116,036

Angelo N. Chaclas

 

139,187

​

*

​

83,183

Paula Cooney

 

24,610

​

*

​

21,841

Han Hendriks

 

​

​

*

​

3,420

Joseph Alvarado

 

15,755

​

*

​

—

Victoria Brifo

 

3,469

​

*

​

—

Jeffrey J. Cote

 

29,188

​

*

​

—

Pierre-Marie De Leener

 

10,536

​

*

​

—

Jeanmarie Desmond

 

10,087

​

*

​

—

Matthew Farrell

 

70,469

​

*

​

—

K’Lynne Johnson

 

12,179

​

*

​

—

Sandra Beach Lin

 

8,362

​

*

​

—

Henri Steinmetz

 

27,815

​

*

​

—

Mark Tomkins

 

11,142

​

*

​

—

All Directors, Nominees and Executive Officers as a Group (21 persons) (5)

 

982,407

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2.7%

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512,447

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Name*

Number of
Shares of
Company		Percentage

Management

Christopher D. Pappas(1)

32,733*

Barry J. Niziolek(2)

9,134*

Timothy M. Stedman

2,111*

Hayati Yarkadas(3)

9,610*

Joseph Alvarado

—*

Jeffrey J. Cote

9,422*

Pierre-Marie De Leener

7,894*

K’Lynne Johnson

—*

Philip R. Martens

1,505*

Donald T. Misheff

4,844*

Henri Steinmetz

—*

Stephen M. Zide

4,930*

All Directors, Nominees and Executive Officers as a Group (18 persons)(4)

115,091*

*Indicates less than one percent.

(1)The ownership percentages set forth in this column are based on the Company’s outstanding ordinary shares (excluding treasury shares) as of March 31, 2024 and assume that each of the beneficial owners continued to own the number of shares reflected in the table on such date.

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STOCK OWNERSHIP INFORMATION

(2)Includes options to purchase ordinary shares which have vested or will vest within 60 days of March 31, 2024.
(3)On August 12, 2022 M&G Investment Management Limited (“M&G”) filed a Schedule 13D with the SEC reporting beneficial ownership of 7,625,044 of our ordinary shares, with sole voting power and sole dispositive power over such shares. In a Form 4 filed by M&G dated July 19, 2022, M&G reported beneficial ownership of 7,625,044 shares, which number is used in the table. The address of M&G is 10 Fenchurch Avenue, London, UK EC3M 5AG.
(4)On February 6, 2024, BlackRock, Inc. filed a Schedule 13G/A with the SEC reporting beneficial ownership of 2,638,164 of our ordinary shares as of December 31, 2023 with sole voting power over 2,585,952 shares and sole dispositive power over 2,638,164 shares. The address of BlackRock, Inc. is 55 East 52nd Street, New York, NY 10055.
(5)Includes 512,447 options to purchase ordinary shares which have vested, or will vest, within 60 days of March 31, 2024.

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STOCK OWNERSHIP INFORMATION

Securities Authorized for Issuance under Equity Compensation Plans

The following table sets forth certain information as of December 31, 2023 with respect to compensation plans under which ordinary shares of the Company may be issued.

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Number of securities

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remaining available

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Number of securities

​

​

​

for future issuance

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​

to be issued upon

​

Weighted-average

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under equity

​

​

exercise of

​

exercise price of

​

compensation plans

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​

outstanding options,

​

outstanding options,

​

(excluding securities

​

​

warrants and rights

​

warrants and rights

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reflected in column (a))

Plan Category

​

(a) 

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(b)

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(c) 

Equity compensation plans approved by securityholders

 

2,735,130

(1)

44.92

(2)

2,075,376

Equity compensation plans not approved by securityholders

 

—

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—

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—

Total

 

2,735,130

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44.92

(2)

2,075,376

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(1)Includes 780,421 restricted stock units, 295,067 performance award stock units, and 1,659,642 options to purchase shares that have been granted under the approved Trinseo PLC Amended & Restated 2014 Omnibus Incentive Plan and remain outstanding as of December 31, 2023. The numberrestricted stock units and performance stock units will result in the issuance of shares immediately upon vesting, with the vesting of performance stock units subject to the Company includes 22,733 vested options.Company’s attainment of pre-established performance goals. The options to purchase shares will result in the issuance of shares upon exercise.

(2)The number of sharesRepresents the weighted-average exercise price of the Company consists of 9,134 vested options.above-mentioned options to purchase shares only. The Company’s performance award stock units and restricted stock units do not have associated exercise prices.

(3)The number of shares of the Company includes 7,510 vested options.

(4)The number of shares of the Company includes 66,085 vested options.

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SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

Delinquent Section 16(a) Beneficial Ownership Reporting ComplianceReports

Section 16(a) of the Securities Exchange Act of 1934, as amended, requires our directors and executive officers, among others, to file with the SEC an initial report of ownership of our stock on a Form 3 and reports of changes in ownership on a Form 4 or a Form 5. Persons subject to Section 16 are required by SEC regulations to furnish us with copies of all Section 16(a) forms that they file. Under SEC rules, certain forms of indirect ownership and ownership of company stock by certain family members are covered by these reporting requirements. When requested, we assist our executive officers and directors in preparing initial ownership reports and reporting ownership changes and will file these reports on their behalf. Based solely on a review of the copies of such forms in our possession, and on written representations from our current directors and executive officers, we believe that all of our executive officers and directors filed the required reports on a timely basis under Section 16(a) during 2016.2023, with the exception of Form 4 amendments filed on July 13, 2023 by Joseph Alvarado, Victoria Brifo, Jeffrey J. Cote, Pierre-Marie De Leener, Jeanmarie Desmond, Matthew Farrell, Sandra Beach Lin, Henri Steinmetz and Mark Tomkins to correct the number of shares withheld for taxes previously reported on June 16, 2023.

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Proposal 2—Advisory Vote on Named Executive Officer Compensation

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The Compensation Discussion and Analysis of this Proxy Statement, which immediately follows this proposal, describes our executive compensation program and the compensation of our named executive officers for fiscal 2023. The Board is asking shareholders to cast a non-binding, advisory vote indicating their approval of that compensation by voting FOR the following resolution:

“RESOLVED, that the shareholders of Trinseo PLC APPROVE, on an advisory basis, the compensation paid to its named executive officers, as disclosed pursuant to the compensation disclosure rules of the Securities and Exchange Commission, including the Compensation Discussion and Analysis, compensation tables and narrative discussion.”

As described in detail in the Compensation Discussion and Analysis, we have a total compensation approach focused on performance-based incentive compensation that seeks to:

●Attract and retain industry-leading talent;
●Link compensation actually paid to achievement of our financial, operating and strategic goals;
●Reward individual performance and contribution to our success; and
●Use performance measures, including financial and non-financial goals that align our named executive officers’ interests with those of our shareholders.

We believe Trinseo’s executive compensation program employs positive governance practices and offers substantial levels of at-risk compensation to meaningfully align shareholder interests with those of our named executive officers.

The Board is asking shareholders to support this proposal, as it does annually. Although the vote we are asking you to cast is non-binding, the compensation committee and the Board value the views of our shareholders as expressed in their votes. The Board and the compensation committee will consider the outcome of the vote when determining future compensation arrangements for our named executive officers.

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THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE “FOR”
THE ADVISORY VOTE ON NAMED EXECUTIVE OFFICER COMPENSATION.

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COMPENSATION DISCUSSION AND ANALYSIS

Compensation Discussion and Analysis

This compensation discussion and analysis (CD&A) section is intended to provide information about our 20162023 compensation objectives and programs for our named executive officers. For 2016,officers, listed below (together, our named executive officers, or NEOs, were:

“NEOs”).

Name

Position

NameFrank A. Bozich

Position

Christopher D. Pappas​

President and Chief Executive Officer

Martin Pugh*David Stasse

Executive Vice President and Chief Operating Officer

Barry J. Niziolek​

Executive Vice President and Chief Financial Officer

Timothy M. StedmanAngelo N. Chaclas

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Senior Vice President, Chief Legal Officer, Chief Compliance Officer and Corporate Secretary

Han Hendriks

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Senior Vice President and Business President, Basic Plastics and FeedstocksChief Technology Officer

Hayati YarkadasPaula Cooney

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Senior Vice President and BusinessChief Human Resources Officer

Andre Lanning (1)

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Former Senior Vice President Performance Materialsand Chief Commercial Officer

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1)*Mr. Pugh retired fromLanning was terminated as Senior Vice President and Chief Commercial Officer and was appointed as Special Advisor on July 17, 2023 in connection with a reorganization of the Company’s management team. Mr. Lanning’s last day with the Company effective March 1, 2017.was January 31, 2024.

This CD&A is divided into the following sections:

Executive Summary

Compensation Philosophy and Design

How We Make Compensation Decisions

2016 Compensation Structure & Performance

●Executive Summary
●Compensation Philosophy and Design
●How We Make Compensation Decisions
●2023 Compensation Structure & Performance
●Other Compensation and Tax Matters

Executive Summary

Business Performance

Business Achievements

We had record financial performance in 2016, which included steady improvement within our Performance Materials division, as well as record results from our Basic Plastics & Feedstocks division. Our 2023 results reflected our continued efforts on investingchallenging operating conditions faced by the Company in growth areas, reducing costs2023, which were significantly impacted by continued persistent underlying demand weakness experienced across all reporting segments, especially in building & construction and consumer durables applications. The Company worked to mitigate the impact of these macroeconomic conditions through streamlining our portfolioimplementation of certain asset restructuring initiatives announced in the fourth quarter of 2022 and asset footprint, generating cash, and improving our net leverage and reducing interest expense. We also had record environmental, health and safety performance as measured by our Responsible Care® program goals, with zero process safety incidents, and only two spills and four recordable injuries. As a result the annual cash incentive plan bonuses paidsecond half of 2023.

Highlights for the year ended December 31, 2023:

●Implemented an asset restructuring plan designed to reduce costs, improve profitability, reduce exposure to cyclical markets and elevated natural gas prices, and address market overcapacity; plan includes closure of certain underperforming or uncompetitive plants and product lines which are expected to be completed by the end of 2024
●Completed a refinancing of $1.1 billion of outstanding term loan and senior note indebtedness in a difficult lending environment, which refinancing extended the entirety of the Company’s debt maturing in 2024 and 75% of debt maturing in 2025 to 2028
●Continued focus on liquidity, including actions to preserve cash through reductions to capital spending, operating expenses and working capital, which generated a year-over-year increase in our cash balance of $47.4 million to $259 million in cash at year end

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COMPENSATION DISCUSSION AND ANALYSIS

Shareholder Approval of Executive Compensation

In 2023, the compensation of our NEOs ranged fromwas approved by shareholders with approximately 144% to 150%95% of the target bonus amount.

Consideration of 2016 Advisory Votevotes cast in favor. Based on Executive Compensation

The compensation committee regularly reviews the philosophy, objectives and elementsthis shareholder support of our executive compensation programs, in relation to our short-we and long-term business objectives. As part of this review, the compensation committee considersbelieve our compensation program and practices are well aligned with our shareholders’ wishes. Our Board members, investor relations and legal function periodically engage with shareholders and investors regarding the viewsstructure of shareholders as reflected in their annual advisory vote on our executive compensation proposal. Atprograms and corporate governance, and we believe the continued strong shareholder support of our 2016say-on-pay proposals indicates our practices accurately represent the desires of our shareholders. We consider insights obtained through shareholder engagement and the results of our annual general meetingadvisory say-on-pay proposal to be critical components to the compensation committee’s design and oversight of shareholders,the Company’s executive compensation programs.

During fiscal 2023, the compensation committee of the Board reviewed our executive compensation proposal received support from approximately 83.4%peer group and concluded our peer group adequately aligned our executive officers’ pay opportunities with our compensation philosophy. The compensation committee also approved performance metrics for incentive pay that, consistent with prior years, were designed to correlate with the way we evaluate our operational results and reflect measures of the votes cast.performance that drive returns for our stockholders. We will continue to evaluate opportunities to enhance our compensation programs to attract and retain top talent and provide furthercontinued alignment with the interests of our shareholders.

In 2016 we adopted a clawback policy that allows incentive-based compensation to be clawed back to the extent it was awarded on the achievement of financial results that become subject to an accounting restatement that should have resulted in the executive receiving a lower amount of compensation had our financial results been properly reported. See “Compensation Philosophy and Design—Maintaining Best Practices Regarding Executive Compensation.”​

For 2017, we have also changed our compensation program to put a greater focus onat-risk, long-term incentive-based compensation by including performance award stock units (“PSUs”) as a component of our executives’ target equity compensation. Executive target equity compensation will now be delivered in the form of stock options (30%), restricted stock units (30%), and PSUs (40%). We believe the addition of PSUs, along with providing a higher concentration of equity compensation in PSUs over the other equity compensation components, will provide greater alignment between our executive compensation program and the creation of shareholder value through the Company’s long-term strategic initiatives.​

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COMPENSATION DISCUSSION AND ANALYSIS

The PSUs will vest on the third anniversary of the grant date, subject to the Company’s relative total shareholder return (“TSR”) performance, assuming the reinvestment of dividends, against the performance of 59 other chemical companies with shares traded on a major U.S. stock exchange and have a market capitalization exceeding $500 million dollars at the time the award is granted. The amount of PSUs that will vest are generally as follows:

Trinseo Percentile Ranking Relative to Peer Group

% of Target Shares Vested* 

Under 25th percentile

0% 

25th percentile

50% 

50th percentile

100% 

75th percentile

200% 

*Vesting is interpolated between the 25th and 50th and between the 50th and 75th percentiles

Regardless of the targets above vesting will be capped at 100% of target if the Company’s TSR is negative for the performance period. Additionally, the total value of the awards delivered at vesting is capped at three times the target shares multiplied by the grant date share price. Because we assume reinvestment of dividends, dividend equivalents will accrue during the performance period. However, dividend equivalents will be paid only if and to the extent the PSUs vest, since we do not believe the executives should receive the benefit of such dividend earnings if the performance criteria associated with the PSU award is otherwise not met.

Beginning in 2016, our Board began changing the composition of the compensation committee and has added additional members from its newly appointed directors. We believe the new composition will provide a fresh perspective on compensation matters.

Compensation Philosophy and Design

Overview

Our executive compensation policies and programs are designed to attract, retain and motivate key executives through competitive and cost effectivecost-effective programs that reinforce executive accountability and reward the achievement of business and individual results. Executive compensation consists of four main elements: (1) base salary, (2) annual cash incentive awards, (3) long-term incentive compensation, and (4) retirement savings and benefit programs. The relative weighting of each element is aligned with our philosophy of linking pay to performance. A substantial percentage of our executives’ compensation is provided in the form of performance-based variable compensation with a greater emphasis on variable components for our senior executives. Annual cash awards are directly linked to corporate results and short-term performance measures, including financial andnon-financial goals. Our equity incentive awards align our executives’ interestinterests with those of our shareholders and our long-term business objectives. Executive retirement and benefits programs are generally consistent with the broader employee programs offered in the country where an executive primarily provides services to the Company. We provide limited perquisites to our executives and senior management, and such perquisites are only provided to the extent that they reflect particular business needs and objectives.

We strive to provide our NEOs with a compensation package that is market competitive within our industry and recognizes and rewards superior individual and companyCompany performance.

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COMPENSATION DISCUSSION AND ANALYSIS

Compensation Mix

The chartcharts below showsshow the 20162023 target mix of compensation between salary and short- and long-term incentive compensation for Mr. PappasBozich, and for our other NEOs as a group. Long-term incentive compensation remains the largest component of our CEO’s and NEOs’ compensation, in order to incentivizewhich we believe incentivizes long-term value creation and to provideprovides continued alignment between the interests of our NEOs and shareholders.

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CEO Target Compensation

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Average Target Compensation
for All Other NEOS
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Maintaining Best Practices Regarding Executive Compensation

Our compensation committee intends to compensate our NEOs in a manner that is consistent with the objectives and design principles outlined above. We have adopted the following compensation practices, which are intended to promote strong corporate governance and alignment with shareholdershareholder’s interests:

Compensation Committee Practices

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Clawback and Recoupment Policies

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We haveThe Company adopted a Policy for Recoupment of Incentive Compensation in November 2023 which provides for the right to clawbackclaw back incentive-based compensation to the extent it was awarded on the achievement of financial results subject to an accounting restatement due to material noncompliance by the Company of any financial reporting requirement under the securities laws, including any required accounting restatement to correct an error in previously issued financial statements that should have resultedis material to the previously issued financial statements, or that would result in a material misstatement if the error were corrected in the executive receivingcurrent period or left uncorrected in the current period. Pursuant to such policy, the Company shall seek recoupment of any cash-based and equity-based incentive compensation, bonuses, and awards granted, paid, earned or that become vested wholly or in part upon the attainment of any financial reporting measure that is (i) calculated based upon the achievement of financial results that were subsequently the subject of such a lowerrestatement and (ii) the amount of such compensation that would have been awarded to the employee had ourthe financial results been properly reported.reported would have been lower than the amount actually awarded. The Company’s board of directorsBoard can recoup this compensation by requiring the reimbursement of compensation previously paid, cancelling outstanding vested or unvested equity awards, or taking any other action permitted by law.

Our equity award agreements also provide for the recoupmentreimbursement of all or part of any annual incentive compensation if there is a breach by the executive of his or her award agreement or anynon-competition,non-solicitation, confidentiality or similar covenant or agreement with us or an overpayment of incentive compensation due to inaccurate financial data.

Share Ownership Guidelines

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The compensation committee has adopted share ownership guidelines (i) equal to (i) six times base salary for the CEO, and (ii) equal to two times base salary for our other NEOs. The guideline must be achieved by January 1, 2021, or5 years from the date of hire for newly hired executives 5 years from their hire date.

(the “accumulation date”). As of December 31, 2023, only Mr. Chaclas had served past the accumulation date, but due solely to a decline in stock price, was not in compliance with the share ownership guidelines. Under our share ownership guidelines, a failure to meet the guidelines due to a decline in stock price is not deemed a breach if the employee met the guidelines in a prior year. Until the guidelineownership requirement is met, the executive must retain as a holding requirement: (i) 50% of the shares issued after vesting and settlement of restricted stock units (shares net(“RSUs”) (net of all applicable taxes), and (ii) 50% of the shares issued following the exercise of a stock option (after satisfaction of the option exercise price and net of applicable taxes), and (iii) 50% of the shares issued after vesting and settlement of performance stock units (“PSUs”) (net of all applicable taxes and full cost to exercise)taxes). None of our NEOs sold any Trinseo shares in 2023.

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COMPENSATION DISCUSSION AND ANALYSIS

Mitigate Undue Risk and Risk Assessment

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The compensation committee regularly assesses whether our compensation programs and arrangements for our employees encourage excessive risk-taking. We mitigate undue risk in our compensation program by instituting strong governance policies such as capping potential payments, utilizing multiple performance metrics, striking a balance between short- and long-term incentives and adopting share ownership requirements.

Compensation at Risk

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We grant a high percentage ofat-risk compensation to our executive officers. We believe this is essential to creating a culture ofpay-for-performance.

Risk AssessmentDouble-Trigger Change-in-Control Provisions

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Our executive officers only receive change-in-control benefits under their equity awards or their employment agreements if their employment is also

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terminated without cause (or by the executive for good reason) within a specified period following a change in control.

No 280G Gross-Up Provisions

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The compensation committee regularly assesses whether our compensation programs and arrangements for our employees encourage excessive risk-taking to ensure that our plans and awards are designed and working in a manner that does not encourage excessive risk taking.permit 280G gross-up provisions in the Company’s executive employment agreements and amendments.

Anti-Hedging and Pledging Policy

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We prohibit our directors, executive officers, and all employees from hedging or pledging the Company’s securities.

Independent Compensation Consultant

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The compensation committee retains and annually reviews the independence of its compensation consultant.

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How We Make Compensation Decisions

Our compensation committee is responsible for, among other matters: (1) reviewing key executive compensation goals, policies, plans and programs; (2) reviewing the compensation of our executive officers; (3) reviewing and approving employment agreements and other similar arrangements between the Company and our executive officers; and (4) administering our equity-based plans and other incentive compensation plans.

Our Chief Executive Officer and President reviews annually with the compensation committee each NEO’s performance (other than his own) and recommends to the compensation committee appropriate base salary, annual cash incentive awards and long-term equity incentive awards (to the extent applicable with respect to a particular year) for these NEOs. Based upon the recommendations of our Chief Executive Officer and President, and after considering the objectives of our executive compensation program, as described above, as well as the factors described below under “—Use“Use of Benchmarking Comparison Data”, the compensation committee makesapproved the final recommendation to the Board for annual compensation packages of our executive officers. With respect to our Chief Executive Officer,In 2023, the compensation committee and/or the Board reviews annually his performance and thealso approved Mr. Bozich’s compensation, committee recommends to the Boardincluding his base salary, annual cash incentive awards and grants ofaward, long-term equity incentive awards based on the compensation committee’s assessmentawards. See “— Narrative Disclosure to Summary Compensation Table and Grants of his performance, as approved by the Board.Plan Based Awards Table; Other Narrative Disclosure” for a description of each NEO’s employment agreement terms.

In making decisions with respect to any element of aan NEO’s compensation, the compensation committee considered the total compensation that may be awarded to the executive, including salary, annual cash incentive awards and long-term incentive compensation. In addition, in reviewing and approving employment agreements for our NEOs, the compensation committee considered the other benefits to which the officer is entitled by the agreement, including compensation payable upon termination of the executive’s employment under a variety of circumstances. Our goal is to award compensation that is competitive to attract and retain highly qualified leaders and that motivates them to drive strong business performance. We believe that our compensation programs align executive and shareholder interests, while allowing compensation to vary based on each executive’s individual contributions to the Company and to the Company’s overall performance.

Use of Benchmarking Comparison Data

In 2015, the compensation committee selected a peer group of companies, with assistance from Willis Towers Watson, for use in making 2016 compensation decisions, with respect to the total mix and amount of compensation. This peer group consists of companies in the chemical and chemical-related industries, as well as companies in the container and packaging and paper and forest product industries. The compensation committee reviewed various market-based metrics of the peer group that it deemed appropriate, which included enterprise value, revenue, market capitalization, and EBITDA margins, to establish compensation benchmarks.

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COMPENSATION DISCUSSION AND ANALYSIS

The compensation committee may annually review the companies included in our peer group and may add or eliminate companies as it determines to be appropriate. The peer group selected for making fiscal 2016 compensation decisions consisted of the following 22 companies:

A. Schulman, Inc.Eastman Chemical CompanyPolyOne Corporation
Axiall CorporationFerro CorporationResolute Forest Products Inc.
Berry Plastics Group, Inc.Graphic Packaging Holding CompanyRPM International Inc.
Boise Cascade CompanyGreif, Inc.Silgan Holdings Inc.
Cabot CorporationHB Fuller CompanyStepan Company
Celanese CorporationKraton Performance Polymers, Inc.Tronox Limited
Chemtura CorporationOlin Corporation
Domtar CorporationOMNOVA Solutions Inc.

Additionally, the compensation committee reviewed various data from Willis Towers Watson databases to supplement data from the peer group. This data allowed the compensation committee to obtain a broader understanding of market compensation levels.Independent Compensation Consultant

The compensation committee has retained Willis Towers Watson as its independent compensation consultant. Willis Towers Watson provides the compensation committee with advice on a broad range of executive compensation matters. The scope of their services includes, but is not limited to, the following:

Apprising the compensation committee of compensation-related trends and developments in the marketplace;

Informing the compensation committee of regulatory developments relating to executive compensation practices;

Providing the compensation committee with an assessment of the market competitiveness of the Company’s executive compensation;

Assessing the composition of the peer companies used for comparative purposes;

Assessing the executive compensation structure to confirm that no design elements encourage excessive risk taking; and

●Apprising the compensation committee of compensation-related trends and developments in the marketplace;
●Informing the compensation committee of regulatory developments relating to executive compensation practices;
●Providing the compensation committee with an assessment of the market competitiveness of the Company’s executive compensation;
●Assessing the composition of the peer companies used for comparative purposes;
●Assessing the executive compensation structure to confirm that no design elements encourage excessive risk taking; and
●Identifying potential changes to the executive compensation program to maintain competitiveness and ensure consistency with business strategies, good governance practices and alignment with shareholder interests.

During fiscal 2016,2023, Willis Towers Watson attended all of the regularly scheduled meetings of the compensation committee.

In addition to providing the compensation committee with these executive compensation consulting services in 2016,2023 for which it received aggregate fees of $200,000,approximately $210,000, Willis Towers Watson also provided the Company with the following additional services for which it received fees totaling $290,000: international actuarial support for the Company’sapproximately $390,000, including pension and postretirement benefit plans;benefits actuarial

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support for one of the Company’s domestic welfare benefit plans; and compensation support to management.pay versus performance valuation support. Before Willis Towers Watson undertook any compensation support work for the Company’s management, the compensation committee was consulted and approved the scope of work.

The compensation committee actively considered the range of the additional services that Willis Towers Watson was already providing to the Company when it made the decision to retain Willis Towers Watson as its independent compensation consultant in 2016.2023. The compensation committee assessed the independence of Willis Towers Watson pursuant to applicable SEC rules and concluded that no conflict of interest exists that would prevent Willis Towers Watson from independently representing the compensation committee.

2016Use of Benchmarking Comparison Data

The compensation committee selects a peer group of companies, with assistance from Willis Towers Watson, for use in making compensation decisions with respect to the total mix and amount of compensation. This peer group consists of companies in the chemical and commodities and chemicals manufacturing industries. The compensation committee reviewed various market-based metrics of the peer group that it deemed appropriate, which included enterprise value, revenue, market capitalization, and EBITDA margins, to establish compensation benchmarks. For 2023, the compensation committee removed six companies from its existing peer group and added eleven new companies. Companies in the paper packaging and metal/glass container industries were removed, as they do not reflect the Company’s current business, and several chemical companies were removed due to differences in their business models compared to Trinseo. Eleven new peer group companies were added, representing a mix of commodity and chemicals companies, which the compensation committee believes better match the Company’s size, product mix, and strategy. The compensation committee may annually review the companies included in our peer group and may add or eliminate companies as it determines is appropriate. The peer group selected for fiscal 2023 compensation decisions consisted of the following 23 companies:

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AdvanSix, Inc.

H.B. Fuller Company

Quaker Chemical Corporation

Ashland Global Holdings Inc.

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Huntsman Corporation

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RPM International Inc.

Avient Corporation

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Ingevity Corporation

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Stepan Company

Axalta Coating Systems Ltd.

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Kronos Worldwide, Inc.

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Synthomer plc

Cabot Corporation

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Methanex Corporation

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Tronox Holdings plc

The Chemours Company

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Minerals Technologies Inc.

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Venator Materials PLC

Eastman Chemical Company

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Olin Corporation

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Westlake Corporation

Element Solutions Inc.

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Orion Engineered Carbons S.A.

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Additionally, the compensation committee reviewed data from Willis Towers Watson to supplement data from the peer group. This data allowed the compensation committee to obtain a broader understanding of market compensation levels.

2023 Compensation Structure & Performance

The principal components of our executive compensation program include both short-term and long-term compensation. Short-term compensation consists of an executive’s annual base salary and annual cash incentive award. Long-term compensation may includegenerally includes grants of share-based incentives as determined by the compensation committee and approved by the Board.committee. Certain elements of compensation of our NEOs were determined through direct negotiation with the executives at the time of their hiring.

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COMPENSATION DISCUSSION AND ANALYSIS

Base Salary

Setting appropriate levels of base pay allows us to attract and retain an executive leadership team that will continue to meet our commitments to customers, sustain profitable growth and create value for our shareholders. The base salaries for our NEOs wereare determined based on the scope of their responsibilities and our compensation committee members’ collective knowledge of competitive compensation levels, as well as competitive compensation benchmarking data from Willis TowerTowers Watson based on our peer group.group and survey data. Base salaries are reviewed annually by the compensation committee and adjusted from time to time to reflect individual responsibilities, performance and experience, as well as market compensation levels.

In 2016,2023, the compensation committee approved salary increases to certain of our NEO’s base salaries. Mr. Pappas’ base salary was raised to $1,100,000 from $1,050,000 effective January 1, 2016. None of the other NEOs receivedStasse, Mr. Chaclas and Ms. Cooney were granted an increase to histheir base salaries of 2.7%, 3.1% and 2.7% respectively, for 2023. Mr. Bozich and Mr. Hendriks did not receive an increase to their base salary in 2016.2023.

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Annual Cash Incentive Plan

Our annual cash incentive plan (“ACI Plan”) is designed to create a pay for performance culture by aligning the compensation program to the achievement of our strategic and business objectives and with shareholder interests. Our business objectives are to: (1) provide a safe working environment;environment by meeting or exceeding our metrics for injuries, spills, and process safety incidents, and demonstrating progress on Sustainability goals; (2) delivergenerate strong recurring profitsfree cash flow and Adjusted EBITDA results relative to our industry; (3) effectively manage our working capital;implement Trinseo’s strategy to transform into a materials-enabled solutions provider; (4) demonstrate effective cost management;promote Company culture, talent development, recruitment and (5) provide EBITDA growth that is stronger than the industry.retention. The actual amount that will be paid in respect of an annual cash incentive awardsACI Plan award is based on a combination of the achievement of Company performance goals as well as individual performance. The performance goals and metrics are recommendedreviewed and approved by the compensation committee to the Board at the beginning of the year. At the end of the year, the amount paid to each NEO is based on the achievement of the Company performance goals and an assessment of the executive’s overall performance.

For 2016,2023, the annual cash incentive planACI Plan was designed to align our executives’ compensation with the Company’s business plan and priorities for the year, and reward performance based on the following three components:

●•Financial Performance: measured by Company Adjusted EBITDA, adjusted as described below;
●Responsible Care®Care®: Injuries,Total Recordable Incident Rate, Spills and Process Safety Incidents (PSIs);Incidents; and

●Individual Goals: Performance against defined business/functional and individual goals.
EBITDA: Adjusted as described below; and

Individual Goals: Performance against defined business/functional and individual goals.

We believebest-in-class environmental, health and safety metrics, as well as individual performance, are important measures for establishing performance objectives and measuring the performance of our NEOs. We are a Responsible Care® company and our environment, health and safety policy states that protecting people and the environment is part of everything we do and every decision we make. Each employee has a responsibility to ensure that our products and operations meet applicable government and Company standards.

The 2016 annual cash incentive plan includes three key environment, health and safety metrics that we track for our Company—Recordable Injuries as defined by OSHA, Process Safety Incidents as defined by the American Chemistry Council, and Loss of Primary Containment, which is defined as any physical device used to contain a chemical or plastic resin as part of our manufacturing processes. Incentive payouts with respect to these metrics are determined based on our achievement rating for Responsible Care® performance and in accordance with the threshold, target and maximum levels set forth in the table below.

In 2016, Company financial performance metrics were based on an Adjusted EBITDA target of $343 million and threshold EBITDA of $274 million (in each case, excluding earnings from our joint ventures and Feedstocks segment of $145 million and $73 million, respectively, and including an adjustment of $30 million to reflect the impact of raw material timing). We believe that Adjusted EBITDA is a key measure of our financial performance, removing the impacts of our capital structure (such as interest expense), asset base (such as depreciation and amortization) and tax structure as well as othernon-recurring items. Therefore, for purposes of the annual cash incentive plan, we define Adjusted EBITDA, which is considered anon-GAAP measure, as net income (loss) from continuing operations before interest expense, net provision for income taxes; depreciation and amortization expense; asset impairment charges; loss on extinguishment of long-term debt,debt; asset impairment charges; gains or losses on the disposition of businesses and assets, restructuring charges; acquisition related costs and benefits, and othernon-recurring items. Our Adjusted EBITDA performance target metric for the 2016 annual cash incentive2023 ACI Plan awards iswas set consistent to our 20162023 business plan that was approved by the Board, but is also adjusted to exclude earningsresults from the Company’s joint venturesAmerican Styrenics segment and its Feedstocks segment, and to exclude the impacts of raw material timing. See “Item 7—Management’s Discussion and Analysis of Financial Condition and Results ofOperations—Non-GAAP Performance Measures” of our Annual Report on Form10-K for more information on our approach to calculating Adjusted EBITDA. WeAs in prior years, we exclude the earnings of our Americas Styrenics segment because as a joint ventures becauseventure the Company does not have direct control of theirits day-to-day operations. WeAdditionally, we also exclude the earnings of our Feedstocks segment and the impacts of raw material timing because market volatility within this segment and timing impacts are generally outside of our executives’ control but can have a significant positive or negative impact on the Company’s financial performance. Our 2023 results reflected continued challenging operating conditions and demand weakness across all reporting segments, especially in building & construction and consumer durables applications. The Company made efforts to mitigate the impact of these macroeconomic conditions through implementation of asset restructuring initiatives, to bolster liquidity through cash preservation actions, and to secure longer-term debt maturity with the refinancing of the substantial majority of its near-term indebtedness.

See “Item 7 — Management’s Discussion and Analysis of Financial Condition and Results of Operations — Non-GAAP Performance Measures” of our Annual Report on Form 10-K for the year ended December 31, 2023 for more information on our approach to calculating Adjusted EBITDA and a reconciliation to the comparable GAAP measure.

Industry-leading environmental, health and safety metrics, as well as individual performance, are important measures for establishing performance objectives and measuring the performance of our NEOs. We are a Responsible Care® company and our environmental, health and safety policy states that protecting people and the environment is part of everything we do and every decision we make. Each employee has a responsibility to ensure that our products and operations meet applicable government and Company standards.

The 2023 ACI Plan includes three environment, health and safety metrics that we track for our Company – (i) Total Recordable Incident Rate, a metric used in the chemicals industry to measure injury rates versus operating hours, (ii) Spills, defined as loss of containment of any physical device used to contain a chemical or plastic resin as part of our manufacturing processes, and (iii) Process Safety Incidents as defined by the American Chemistry Council. Incentive payouts with respect to these metrics are determined based on our achievement rating for Responsible Care® performance and in accordance with the threshold, target and maximum levels set forth in the table below.

In addition, each NEO had individual performance goals that included, depending on the NEO: corporate Adjusted EBITDA; Free Cash Flow; capital spending; margins and profitability; strategic transformation; corporate development projects and integrations; organizational effectiveness; safety and sustainability; human capital management; and budget oversight. The results achieved against each of these individual goals were assessed by the CEO or the compensation committee and a percentage rating was assigned to each NEO.

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The table below shows the weight and targets of the component metrics, along with the payout opportunity for the annual cash incentive plan.ACI Plan.

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Weight of

    

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100%

    

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Metric in

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Threshold 

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Performance

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Exceeds

Performance Goal

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ACI Plan (%)

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Target

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Target

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Target

1. Financial Performance

 

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2022 Adjusted EBITDA Target (Per 2022 Business Plan)

 

60%

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$

261M

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$

327M

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$

392M

2. Responsible Care®

 

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Total Recordable Incident Rate

 

5%

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0.3

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0.2

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0.1

Spills

 

5%

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11

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8

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5

Process Safety Incidents

 

5%

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3

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2

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0

Responsible Care® Sub-total

 

15%

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3. Individual Goals

 

25%

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Total Opportunity at Target

 

100%

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Maximum Opportunity

 

200%

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Performance Goal

  Weight  Threshold   

Level of
Performance

Target

   Exceeds 

1. Responsible Care®

       

Recordable Injuries*

   5%   8    6    4 

Loss of Primary Containment*

   5%   10    7    4 

Process Safety Incidents*

   5%   2    1    0 

Sub-total

   15%      

2. Financial Performance

       

2016 EBITDA Target (Per 2016 Business Plan)

   60%  $274M   $343M   $403M 

3. Individual Goals

   25%      

Total Opportunity at Target

   100%      

Maximum Opportunity

   200%               

*Metrics represent incident count.

In 2016, our achievement rating for Responsible Care®The Company’s financial performance qualified each NEO for a 30% annual cash incentive award payout for the Responsible Care®component. In addition,metric was based on an Adjusted EBITDA target of $327 million and threshold Adjusted EBITDA target of $261 million. The actual year-end Adjusted EBITDA for purposes of the 2023 ACI Plan was $161 million, which represents the Company’s year-end Adjusted EBITDA of $154 million excluding $62 million in earnings from our 2016joint ventures and $42 million in losses from our Feedstocks segment, and excluding the impact of $27 million of unfavorable raw material timing, as described above. Based on our 2023 audited financial results, our compensation committee determined that our financial performance component resulted in 82%no payout of the Adjusted EBITDA component of the ACI Plan, as set forth in the table below. All payout values in this table are shown as a percentage of target.

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Actual

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Payout as % of

Payout as % of

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Result

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Target

Total Target Bonus

Financial Performance (Adjusted EBITDA)

    

$

327M

    

$

161M

    

0%

0%

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Our achievement rating for the Responsible Care® portion of the bonus becoming payable. Actual resultsqualified each NEO for 11.7% of the Responsible Care® and Adjusted EBITDA financial performance areCare® component of the ACI Plan, as set forth below:below. All payout values in this table are shown as a percentage of target.

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Potential Payout

    

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Total Actual

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as% of Total 

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Performance

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Actual Payout 

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Payout

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Target Bonus 

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Target (100%) 

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Actual Result 

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as % of Target 

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as % of Target

Responsible Care®

 

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Total Recordable Incident Rate

 

5%

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0.2

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0.3

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0%

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0%

Spills

 

5%

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8

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7

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0%

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0%

Process Safety Incidents

 

5%

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2

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2

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100%

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5.0%

Responsible Care® Total

 

15.0%

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5.0%

   % of
Metric Weight		      Level of Performance 
    Actual   Threshold   Target   Exceeds 

Responsible Care®

         

Recordable Injuries*

   10%   2    8    6    4 

Loss of Primary Containment*

   10%   4    10    7    4 

Process Safety Incidents*

   10% �� 0    2    1    0 

Responsible Care Total

   30%        

Financial Performance (Adjusted EBITDA)

   82%  $365M   $274M   $343M   $403M 

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*

Metrics represent incident count.

The Company’s actual results in this category would have resulted in an above-target payout, however, due to the reputational impact of the spill at the Company’s Bristol location in March 2023, the compensation committee decided that the actual payout should be 0%.

Discretionary ACI Plan Award. In addition, each NEO had personal performance goals that included, depending onrecognition of the individual: corporate or business EBITDA; asset, product optimization and customer profitability; organizational effectiveness; people leadership, and cost management. The results achieved against each of these goals were assessedchallenges faced by the Company during 2023, the compensation committee exercised its discretion to increase the ACI Plan payout by 6.7% to acknowledge significant progress made on many key initiatives during the year, including the refinancing of $1.1 billion of near-term indebtedness, successful implementation of liquidity-focused actions generating a year-over-year cash balance increase of $47 million, and ratings were assigned.

During 2016,continued focus on sustainability initiatives including growth of products containing recycled or bio-based materials and the target bonus under this plan for each NEO was based oninauguration of a percentage of base salary ranging from 150%,polycarbonate dissolution pilot facility in the case of Mr. Pappas, to 75%, in the case of Mr. Pugh, 70% in the case of Mr. Niziolek and 60% in the case of Messrs. Stedman and Yarkadas. The table below shows the 2016 target annual incentive award for each NEO and the actual award payable, based on our performance and the individual’s performance.Netherlands.

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NEO

  Target
Percentage		  Target Amount   Actual Amount 

Christopher D. Pappas

   150%  $1,650,000   $2,467,960 

Martin Pugh(1)

   75%  $454,500   $653,344 

Barry J. Niziolek(2)

   70%  $350,000   $273,000 

Timothy M. Stedman(1)

   60%  $272,700   $396,779 

Hayati Yarkadas(1)

   60%  $272,700   $402,574 

​

39

(1)Messrs. Pugh, Stedman, and Yarkadas’ compensation is payable in CHF and was converted using the foreign exchange rate of US$1.01 to CHF1.00. This rate was determined by averaging the exchange rates in effect during 2016.

Graphic       2024 Proxy Statement

​

(2)Mr. Niziolek’s actual amount waspro-rated to reflect his June 2016 hire date.

Table of Contents

28LOGO2017 Proxy Statement

COMPENSATION DISCUSSION AND ANALYSIS

The table below shows the contribution of each performance metric under our annual cash incentive planACI Plan to the actual bonus award earned by our NEOs. All values in this table are shown as a percentage of target.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

EBITDA

    

Responsible 

    

Individual 

    

​

    

Actual Payout

NEO

​

(60%) 

​

Care (15%)

​

Goals (25%) 

​

Discretionary

​

as a % of Target 

Frank A. Bozich

 

0%

​

5%

​

85%

​

6.7%

​

33%

David Stasse

 

0%

​

5%

​

200%

​

6.7%

​

62%

Angelo N. Chaclas

 

0%

​

5%

​

200%

​

6.7%

​

62%

Han Hendriks

 

0%

​

5%

​

100%

​

6.7%

​

37%

Paula Cooney

 

0%

​

5%

​

115%

​

6.7%

​

40%

Andre Lanning

 

0%

​

5%

​

90%

​

6.7%

​

34%

​

NEO

  Responsible
Care (15%)		  

EBITDA

(60%)

  Individual
Goals (25%)		  Actual Award as
a % of Target		 

Christopher D. Pappas

   200%   136%   150%   149.5% 

Martin Pugh

   200%   136%   127%   143.8% 

Barry J. Niziolek

   200%   136%   128%   144.0% 

Timothy M. Stedman

   200%   136%   134%   145.5% 

Hayati Yarkadas

   200%   136%   143%   147.6% 

During 2023, the target bonus for each NEO under the ACI Plan was based on a percentage of base salary. The table below shows the 2023 target annual incentive award for each NEO and the actual award payable, based on Company performance metrics and individual performance goals.

​

​

​

​

​

​

​

​

​

​

​

​

    

Target Payout

    

Target Payout 

    

Actual Payout

    

Actual Payout

NEO

​

as % of Base Salary

​

Amount

​

as a % of Target

​

Amount

Frank A. Bozich

 

130%

​

$

1,365,000

​

33%

​

$

449,768

David Stasse

 

75%

​

$

423,750

​

62%

​

$

261,454

Angelo N. Chaclas

 

75%

​

$

375,000

​

62%

​

$

231,375

Han Hendriks (1)

 

60%

​

$

317,461

​

37%

​

$

116,509

Paula Cooney

 

60%

​

$

308,100

​

40%

​

$

124,627

Andre Lanning (1)

 

60%

​

$

323,335

​

34%

​

$

110,581

​

(1)Compensation for Mr. Hendriks is payable in EUR. The amount of compensation earned or received during 2023 was converted using the foreign exchange rate of US$1.0798 to EUR 1.00. Mr. Lanning’s compensation was paid in CHF and was converted using the foreign exchange rate of US$1.1061 to CHF1.00. These rates were determined by averaging the monthly exchange rates in effect during 2023.

​

​

​

​

2024 Proxy StatementGraphic

40

​

Table of Contents

COMPENSATION DISCUSSION AND ANALYSIS

Long-Term Equity Incentive Compensation

In February 2016, our BoardOur compensation committee approved equity award grants to certain key employees, including forthe NEOs, Pappas, Pugh, Stedman and Yarkadas. Mr. Niziolek’s equity award grant was approvedwhich were awarded in June 2016 due to timing of his start of service withFebruary 2023 under the Company.Company’s Amended & Restated 2014 Omnibus Incentive Plan (the “Equity Plan”). Each of our NEOs received a grantan equity award comprised of restricted stock units andthree types of awards: options to purchase our ordinary shares (30%), RSUs (30%), and PSUs (40%). The total award is based on a target percentage of their base salary, as shown in the table below. These awards are subject to time-based vesting conditions, with restricted share unit awards vesting in full on the third anniversary of the date of grant and options vesting in three equal annual installments beginning on the first anniversary of the date of grant, RSUs vesting in full on the third anniversary of the date of grant and PSUs partially vesting on each of the first, second and third year anniversary of the date of grant, subject to the Company’s relative total shareholder return (“TSR”) performance. In each case, vesting is generally subject to athe NEO’s continuous employment with us on the applicable vesting date.

​

​

​

​

​

​

​

    

LTI

    

LTI

NEO

​

Target % 

​

Target Amount

Frank A. Bozich

 

420%

​

$

4,410,000

David Stasse

 

205%

​

$

1,158,250

Angelo N. Chaclas

 

170%

​

$

850,000

Han Hendriks (1)

 

70%

​

$

370,371

Paula Cooney

 

120%

​

$

616,200

Andre Lanning (1)(2)

 

140%

​

$

754,449

Our​

(1)Compensation for Mr. Hendriks was paid or is payable in EUR. The amount of compensation earned or received during 2023 was converted using the foreign exchange rate of US$1.0798 to EUR 1.00. Mr. Lanning’s compensation is payable in CHF and was converted using the foreign exchange rate of US$1.1061% to CHF1.00. These rates were determined by averaging the monthly exchange rates in effect during 2023.
(2)Mr. Lanning’s last day with the Company was January 31, 2024. Mr. Lanning’s outstanding unvested LTI awards continued to vest through his final date of employment. Mr. Lanning’s RSUs granted before 2022 were vested on a pro-rata basis, while RSUs granted in 2022 or later were vested in full, as of his final date of employment. Mr. Lanning’s outstanding stock options continue to vest according to their original vesting schedule. All outstanding PSU awards unvested as of his final date of employment were forfeited.

The Board chose to grant long-term incentives in the form of stock options and restricted stock units to align the interests of our executives with those of our shareholders, encourage a longer-term view on thegrants PSUs as part of our executives, and to provide a retention tool, primarily in the form of restricted stock units since they will not vest until the third anniversary of the date of grant. Fifty percent of the grant date value of each NEO’s 2016 award wastarget equity compensation package to increase the percentage of at-risk, long-term incentive-based compensation. We believe the use of PSUs, in a higher concentration of equity compensation as compared to the form ofRSU and stock optionsoption components, provides greater alignment between our executive compensation program and the other fifty percent increation of shareholder value through the form of restricted stock units. Our boardCompany’s long-term strategic initiatives. In addition, our Board considers the stock options to be performance-based because a stock option will only have value to the extent that our stock price increases after the date the stock option is granted.

For 2017, the Board changed its long-term incentive compensation componentsPSUs granted in 2023 vest during four performance periods, consisting of three one-year performance periods and one three-year performance period, which are each measured independently. Subject to put a greater focus onat-risk, long-term incentive-based compensation by including performance award stock units (“PSUs”) as 40% of the executive’s target equity compensation. Thecontinued employment during the full three-year performance period, vesting will be calculated during each performance period based on the Company’s relative TSR performance, assuming the reinvestment of dividends, against the performance of all chemical and basic materials companies in the S&P 600 Small Cap Index (the “Performance Peer Group”) during the fiscal year. PSUs which vest during each performance period will vest onbe delivered, in aggregate, following the third anniversary of the grant date (the “final vesting date”).

​

41

Graphic       2024 Proxy Statement

​

Table of Contents

COMPENSATION DISCUSSION AND ANALYSIS

The number of 2023 PSUs that will vest during each performance period, based on the achievement of relative TSR performance goals, will be as follows:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

% of Award

​

TSE

​

​

​

​

​

​

​

​

​

​

 

​

​

Eligible 

​

Performance

​

​

​

​

​

Payout %

​

​

​

​

 

Metric

    

for Vesting

    

Threshold

    

Target

    

Maximum

    

Threshold

    

Target

    

Maximum

 

2023 TSE TSR

 

​

​

25th

 

50th

 

75th

 

​

​

​

​

​

​

(relative to Performance Peer Group)

​

15%

​

Percentile

 

Percentile

 

Percentile

​

50%

​

100%

​

200%

​

2024 TSE TSR

 

​

​

25th

 

50th

 

75th

 

​

​

​

​

​

​

(relative to Performance Peer Group)

​

15%

​

Percentile

 

Percentile

 

Percentile

​

50%

​

100%

​

200%

​

2025 TSE TSR

 

​

​

25th

 

50th

 

75th

 

​

​

​

​

​

​

(relative to Performance Peer Group)

​

15%

​

Percentile

 

Percentile

 

Percentile

​

50%

​

100%

​

200%

​

2023 – 2025 TSE Cumulative TSR

 

​

​

25th

 

50th

 

75th

 

​

​

​

​

​

​

(relative to Performance Peer Group)

​

55%

​

Percentile

​

Percentile

​

Percentile

​

50%

​

100%

​

200%

​

​

*

Vesting is interpolated between the 25th and 50th and between the 50th and 75th percentiles.

Regardless of the targets above, vesting for each performance period is capped at 100% of target if the Company’s TSR is negative for the performance period. Additionally, the total value of the shares delivered at the final vesting date is capped at three times the target shares multiplied by the grant date share price. Because we assume reinvestment of dividends, dividend equivalents accrue during the performance period. However, dividend equivalents will be paid only if the PSUs vest, and are based on the number of vested PSUs delivered on the final vesting date, since we do not believe the executives should receive the benefit of such dividend earnings if the performance criteria associated with the PSU award is not otherwise met.

The PSU awards granted to NEOs in 2021 partially met their TSR performance metrics during the performance period and therefore 10.3% of the target awards vested in 2024. Messrs. Bozich, Stasse and Chaclas received shares upon vesting of these PSU awards. The number of PSUs granted in 2021 was based the closing price on the date of grant, or $61.06 per share. On the PSU vesting date, the closing price of Trinseo shares was $4.78.

Retention Awards

In February 2023, additional long-term incentive retention awards were granted to Mr. Stasse and Mr. Chaclas, in recognition of their contributions to the Company during 2022, including the implementation of its asset restructuring plan and attempted sale of the styrenics business, and to retain their services to the Company during the award vesting period. The additional long-term incentive awards granted to Mr. Stasse and Mr. Chaclas were in an amount equal to their ordinary annual long-term incentive award grants for 2023 described above, and comprised of 50% RSUs and 50% PSUs. These awards are subject to the same vesting conditions as their ordinary annual long-term incentive awards, with RSUs vesting in full on the third anniversary of the date of grant and PSUs partially vesting on each of the first, second and third year anniversary of the date of grant, subject to the Company’s relative TSR performance. We believe the addition of PSUs, along with providing a higher concentration of equity compensation in PSUs as comparedThe awards are generally subject to our restricted stock unit and stock option components, will provide greater alignment between our executive compensation program and the creation of shareholder valuetheir continuous employment through the Company’s long-term strategic initiatives.applicable vesting date.

​

Name

    Target
Percentage		     Target Amount 

Christopher D. Pappas

     450%     $4,950,000 

Martin Pugh(1)

     175%     $1,069,006 

Barry J. Niziolek

     155%     $775,000 

Timothy M. Stedman(1)

     100%     $458,146 

Hayati Yarkadas(1)

     100%     $458,146 

​

​

(1)

​

2024 Proxy StatementGraphic

Messrs. Pugh, Stedman, and Yarkadas’ compensation is payable in CHF and the above target amount was converted using the foreign exchange rate of US$1.01 to CHF1.00. This rate was determined by averaging the exchange rates in effect during 2016.

42

​

Table of Contents

COMPENSATION DISCUSSION AND ANALYSIS

Other Compensation and Tax Matters

Retirement Benefits

Our qualified U.S. savings plan (the “401(k) plan”) provides for (1) annual discretionary Company contributions and (2) employer matching contributions to be credited to participants’ accounts. The U.S.-based NEOs participate in this plan on the same basis as our other employees. We also maintain anon-qualified U.S. savings and deferral plan in which each of our U.S.-based NEOs participates.may participate. This plan allows participants to defer a portion of their compensation on apre-tax basis, with matching contributions from the Company that are payable at a future date based on the terms of the plan. Additionally, the plan provides for discretionary Company contributions in connection with earnings that are in excess of the limitations set forth in the 401(k) Plan.

2017 Proxy StatementLOGO29

COMPENSATION DISCUSSION AND ANALYSIS

plan. Mr. Hendriks participated in our Netherlands-based defined contribution plan.

Our NEOs do not participate or have account balances in any qualified ornon-qualified defined benefit pension plans sponsored by the Company, with the exception of Messrs. Pugh, Stedman, and YarkadasMr. Lanning, who participateparticipated in our Switzerland-based defined contribution retirement plan. Additionally, under the terms of his employment agreement, Mr. Pugh receivedOur NEOs do not participate in any supplemental employee retirement plan or have such aone-time retirement allowance of $202,138, in connection with his retirement. plan provided by their agreement.

Pursuant to the terms of Mr. Pappas’s employment agreement, he is entitled to a retirement benefit payable in the form of a cash lump sum upon his retirement or other termination of employment in an amount determined in accordance with a formula contained in his employment agreement as described in more detail under “Executive Compensation—Pension and Other Postretirement Benefits—Supplemental Employee Retirement Benefit” below.

Severance Benefits

Our NEOs are eligible for severance benefits under their employment agreements upon certain terminations of employment. The agreements provide the NEOs, except Mr. Pappas,Stasse, Mr. Chaclas and Ms. Cooney with severance benefits in an amount equal to 1.5 times the sum of the executive’s annual base salary and target bonus.bonus paid monthly over 18 months, and Mr. Pappas is eligible forHendriks with severance benefits in an amount equal to 1.0 times the sum of his annual base salary and target bonus paid monthly over 12 months. Mr. Bozich’s employment agreement provides him with severance benefits, upon certain terminations of employment, in an amount equal to 2.0 times the sum of his annual base salary and target bonus.

Change-in-Control Severance Benefitsbonus paid monthly over 24 months.

We providechange-in-control severance benefits to certain executives, including our current NEOs. Thesechange-in-control severance benefits are intendeddesigned to minimize the distraction and uncertainty that could affect key management in the event we become involved in a transaction that could result in a change in control of the Company and to enable the executives to impartially evaluate such a transaction. These change-in-control benefits are structured with “double trigger” terms. Under the terms of these agreements, each NEO is entitled to a lump sum payment equal to 2.0 times the severance benefits set forth above (rather than paymentsum of severance benefitsthe executive’s annual base salary and target bonus, and in installments)the case of Mr. Bozich, 3.0 times the sum of his annual base salary and target bonus, if the NEO experiences a termination ofNEO’s employment is terminated other than for cause“Cause” or in the eventif the NEO resigns for good“good reason,” as defined in the agreements, within two years following achange-in-control change in control of the Company. Mr. Pappas is also entitled to aso-called 280Ggross-up with respect to certain payments that may be made to him in connection with a change in control, a benefit that was negotiated at the time Mr. Pappas was hired by us. The compensation committee does not intend to include apermit 280Ggross-up provisions in any newits executive employment agreements or amendments to existing agreements with any other executives.amendments.

Other Compensation

Each NEO is eligible to participate in our generally-applicablegenerally-available benefit plans, such as savings, medical, dental, group life, disability and accidental death and dismemberment insurance, in accordance with country practices. Additionally, the Company may offer certain perquisites to certain executives when appropriate or necessary to recruit or retain talented and qualified individuals. As a Company that operates worldwide, we often offer certain types of perquisites to our executives, such as payment of group life insurance premiums, tuition payments for children, vehicle allowances or moving or commuting expenses in order to compensate individualsexecutives who relocate. See the footnotes to the “Summary Compensation Table” and the “Narrative“Narrative Disclosure to Summary Compensation Table and Grants of Plan Based Awards Table; Other Narrative Disclosure”Disclosure” below for more details regarding the other compensation paid to our NEOs.

TaxAnti-Hedging and Accounting ConsiderationsPledging Policy

Section 162(m)The Board has adopted a policy prohibiting hedging transactions and disallowing pledging transactions subject to certain narrow exceptions. Pursuant to this policy, no officer, director or employee may engage in short sales, hedging or monetization transactions, such as zero-cost collars and forward sale contracts, puts, calls, or other derivative securities including options, warrants, convertible securities, stock appreciation rights or similar securities. This prohibition does not apply to exercise of Company stock options. Officers, directors and employees are also prohibited from maintaining Company securities in a margin account. No officer, director or employee of the Code imposesCompany may pledge Company securities as collateral for a limit of $1,000,000 onloan without first showing financial capacity to repay the amount that a publicly-traded company may deduct for federal income tax purposes in any taxable year for compensation paid to our CEOloan and obtaining preapproval from the three other highest-paid NEOs, other than our CFO, who are employed as of the end of the year. To the extent that compensation is “performance-based” within the meaning of Section 162(m) or to the extent that compensation meeting certain requirements is paid during a limited period of time following our IPO, the Section’s limitations will not apply. To qualify as performance based, compensation must, among other things, be paid pursuant to a shareholder approved plan upon the attainment of objective performance criteria.Company’s Chief Compliance Officer.

Our compensation committee believes that the tax deductibility of compensation is an important factor, but not the sole factor, in setting executive compensation policies and in rewarding superior executive performance. However, the compensation committee reserves the right to approve the payment of compensation to our executive officers that does not qualify as “performance-based” within the meaning of Section 162(m) and therefore, may not be deductible for federal income tax purposes.

In determining variable compensation program designs, our compensation committee also considers other tax and accounting implications of particular forms of compensation, such as the implications of Section 409A of the Code governing deferred compensation arrangements and favorable accounting treatment afforded certain equity based plans that are settled in shares.

​

43

30LOGO

Graphic2017       2024 Proxy Statement

​

Table of Contents

COMPENSATION DISCUSSION AND ANALYSIS

Timing of Awards

We regularly award annual equity grants to our executive officers in February of each year, so as to provide apre-set schedule for our equity grants that won’t be impacted by events external or internal to the Company. New hires may, depending on the timing of their hire, be eligible for a grant at the next board meeting following his or her hire.

​

Compensation Committee Report

The compensation committee has reviewed and discussed the Compensation Discussion and Analysis section (the “CD&A”) required by Item 402(b) of Regulation S-K with management. Based on such review and discussions, the compensation committee recommended to the Board that the CD&A be included in this proxy statement on Schedule 14A.

THE COMPENSATION AND TALENT DEVELOPMENT COMMITTEE

Joseph Alvarado, Chair

Victoria Brifo

Pierre-Marie De Leener

Matthew Farrell

K’Lynne Johnson

​

​

​

​

​

20172024 Proxy StatementGraphic

LOGO31

44

​

Table of Contents

EXECUTIVE COMPENSATION

Executive Compensation

Summary Compensation Table

The following table sets forth information regarding the compensation paid to or earned by our NEOs for the years ended December 31, 2016, 2015,2023, 2022 and 2014,2021, as applicable. For additional information, please read the footnotes and narrative disclosures that follow the table.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

​

    

​

    

​

    

​

    

​

    

​

    

Changes 

    

​

    

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

in Pension 

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Value and 

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Non-qualified 

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Non-Equity 

​

Deferred 

​

​

​

​

​

​

​

​

​

​

​

​

Stock 

​

Option 

​

Incentive Plan 

​

Compensation 

​

All Other 

​

​

​

​

​

​

Salary

​

Bonus

​

Awards

​

Awards

​

Compensation

​

Earnings

​

Compensation

​

Total

Name and Principal Position

​

Year 

​

($)

​

($)(2) 

​

($)(3) 

​

($)(4) 

​

($)(5)

​

($)(6)

​

($)(7)

​

($)1

Frank Bozich

​

2023

​

1,050,000

​

—

​

2,804,973

​

1,322,998

​

449,768

​

13,387

​

138,719

​

5,779,845

President and Chief Executive Officer

​

2022

​

1,050,000

​

—

​

2,761,179

​

1,197,862

​

650,000

​

2,041

​

132,501

​

5,793,583

​

​

2021

​

1,025,000

​

—

​

2,511,215

​

1,076,254

​

2,265,251

​

8

​

124,165

​

7,001,892

David Stasse

 

2023

​

565,000

​

—

​

1,802,356

​

347,477

​

261,453

​

9,200

​

64,124

​

3,049,610

Executive Vice President & Chief Financial Officer

​

2022

​

550,000

​

—

​

761,223

​

330,226

​

206,250

​

1,700

​

61,342

​

1,910,742

​

 

2021

​

520,000

​

—

​

636,978

​

272,994

​

663,000

​

13

​

54,502

​

2,147,487

Angelo N. Chaclas

 

2023

​

500,000

​

—

​

1,322,728

​

255,004

​

231,375

​

32,965

​

58,467

​

2,400,539

Senior Vice President and Chief Legal Officer

​

2022

​

485,000

​

—

​

503,424

​

218,402

​

181,875

​

9,376

​

55,671

​

1,453,748

​

 

2021

​

460,000

​

—

​

482,985

​

206,996

​

586,500

​

21,789

​

50,171

​

1,808,441

Han Hendriks (1)

 

2023

​

490,000

​

269,950

​

236,239

​

111,424

​

116,509

​

—

​

48,258

​

1,272,380

Senior Vice President and Chief Technology Officer

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Paula Cooney

 

2023

​

513,500

​

—

​

391,938

​

184,859

​

124,627

​

936

​

54,567

​

1,270,427

Senior Vice President and Chief Human Resources Officer

​

2022

​

500,000

​

—

​

415,250

​

180,136

​

150,000

​

—

​

26,715

​

1,272,100

Andre Lanning (1)

 

2023

​

538,892

​

—

​

467,291

​

220,404

​

110,581

​

274,313

​

12,178

​

1,623,660

Former Senior Vice President and Chief Technology Officer

​

2022

​

478,384

​

157,290

​

488,873

​

212,089

​

135,911

​

124,783

​

8,651

​

1,605,980

​

 

2021

​

458,192

​

273,650

​

252,605

​

108,240

​

426,307

​

108,365

​

14,230

​

1,641,589

Name and

Principal Position

 Year  Salary
($)(1)		  Bonus
($)(2)		  Stock
Awards
($)(3)		  Option
Awards
($)(4)		  Non-Equity
Incentive Plan
Compensation
($)(5)		  Changes in
Pension
Value
and Non-
qualified
Deferred
Compensation
Earnings
($)(6)(7)		  All Other
Compensation
($)(8)		  Total ($) 

Christopher D. Pappas

President and Chief

Executive Officer

  2016  $1,100,000  $—  $2,475,010  $2,409,702  $2,467,960  $315,140  $180,961  $8,948,773 
  2015  $1,050,000  $—  $2,100,000  $2,100,000  $2,693,250  $2,048,653  $164,000  $10,155,903 
  2014  $1,000,001  $500,000  $—  $—  $1,218,725  $2,865,711  $165,104  $5,749,541 

Martin Pugh(9)

EVP & Chief

Operating Officer

  2016  $606,000  $—  $534,518  $520,402  $653,344  $415,550  $—  $2,729,814 
  2015  $622,200  $—  $467,560  $467,560  $662,249  $184,440  $—  $2,404,009 
  2014  $603,900  $549,000  $—  $—  $271,030  $424,591  $—  $1,848,521 

Barry J. Niziolek

EVP & Chief Financial Officer

  2016  $259,615  $—  $387,524  $387,964  $273,000  $—  $20,135  $1,328,238 

Timothy M. Stedman(9)

SVP and Business President,

Basic Plastics and Feedstocks

  2016  $454,500  $459,550  $229,083  $223,033  $396,779  $163,198  $138,796  $2,064,939 

Hayati Yarkadas(9)

SVP and Business President,

Performance Materials

  2016  $454,500  $202,000  $229,083  $223,033  $402,574  $162,184  $174,301  $1,847,675 

​

(1)Compensation for Mr. Hendriks was paid or is payable in EUR. The amount shownof compensation earned or received during 2023 was converted using the foreign exchange rate of US$1.0798 to EUR 1.00. Compensation for Mr. Niziolek represents the portionLanning was paid or is payable in CHF. The amount of base salary hecompensation earned or received during 2023, 2022 and 2021 was converted using the period between his hire dateforeign exchange rate of June 13US$1.1061 to CHF 1.000, US$1.0486 to CHF 1.000 and December 31, 2016. PriorUS$1.0946 to Mr. Niziolek’s hiring Mr. Pappas served asCHF 1.00, respectively. These rates have been determined by averaging the Company’s interim Chief Financial Officer.exchange rates in effect for each calendar year.

(2)The amountamounts in this column forpaid to Mr. Pappas reflects his special retention award paid in 2014. The amount in this column forHendriks and Mr. Pugh reflects a retention bonusLanning are related to sign-on bonuses granted as part of histheir offer of employment, agreement, ofand a retention award granted to Mr. Lanning in 2020, which CHF 500,000are paid in installments over multiple years. Mr. Hendriks’ sign-on bonus was paid in 2014. The amount in this column for Messrs. Stedmanon March 31, 2023 and Yarkadas reflect signing bonuses of CHF 455,000 and CHF 200,000, respectively, paid in 2016. The signing bonuses for Messrs. Stedman and Yarkadas were contingent onbecomes fully vested two years after the executive’s continued employment through the first anniversary of their employment with the Company and were compensation for equity grants from previous employers that were forfeited upon their employment with the Company. Please see “—Narrative Disclosure to Summary Compensation Table and Grants of Plan Based Awards Table; Other Narrative Disclosure” for a description of the staggered signing bonuses due to Messrs. Stedman and Yarkadas under their respective employment agreements.payment date.

(3)The amount in this column reflects the fair value of restricted stock unit and performance unit awards granted in the periods presented, calculated in accordance with ASC 718. The assumptions used for determining fair value are described in Note 1723 to our consolidated financial statements filed with our Annual Report on Form10-K. There were no For Mr. Stasse and Mr. Chaclas, this amount includes a retention equity award in an amount equal to their ordinary annual long-term incentive award grants for 2023, comprised of restricted stock unit50% RSUs and 50% PSUs. The grant date fair value of the PSU awards undergranted in 2023, assuming achievement of the 2014 Omnibus Incentive Plan prior to 2015.highest level of performance (200% of the target award) is as follows:

​

45

Graphic       2024 Proxy Statement

​

Table of Contents

EXECUTIVE COMPENSATION

​

​

​

​

​

    

Maximum Grant Date 

NEO

​

Fair Value

Frank Bozich

​

$

2,963,938

David Stasse

​

$

1,751,513

Angelo N. Chaclas

​

$

1,285,414

Han Hendriks

​

$

249,638

Paula Cooney

​

$

414,149

Andre Lanning

​

$

493,774

​

(4)The amount in this column reflects the fair value of option awards granted in the periods presented, computed using the Black-Scholes pricing model, whose inputs and assumptions are as of the grant dates and described in Note 1723 to our consolidated financial statements filed with our Annual Report on Form10-K. There were no grants of option awards under the 2014 Omnibus Incentive Plan prior to 2015.

(5)This amount includes each NEO’s earned annual cash incentive payout as discussed in “Compensation“Compensation Discussion and Analysis—2023 Compensation Elements—AnnualStructure & Performance —Annual Cash Incentive Plan”Plan” above.

(6)The amount in this column reflects the aggregate change in the actuarial present value of the applicable named executive officer’sMr. Lanning’s accumulated benefit under our defined benefit pension plan and arrangements in respect of each year in the table, as follows:table. Amounts reported for Messrs. Pappas, Pugh, StedmanBozich, Stasse and Yarkadas for the year December 31, 2016 $315,140, $415,550, $163,198, and $162,184, respectively; for Messrs. Pappas and Pugh for the year December 31, 2015 $2,048,653 and $184,440, respectively; for Messrs. Pappas and Pugh for the year ended December 31, 2014 $2,865,711 and $424,591, respectively. Mr. Niziolek did not participate in pension and other postretirement benefit arrangements. Please see “—Pension and Other Postretirement Benefits” for a description of these arrangements.

(7)No amount is reported with respect toChaclas reflect earnings onnon-qualified deferred compensation plans because above market rates are not provided under such plans. See “—U.S.Non-Qualified Deferred Compensation Table”Table” below for information with respect to the NEOs’ deferred compensation amounts for 2016.2023.

(7)
32LOGO2017 Proxy Statement

EXECUTIVE COMPENSATION

(8)Included in “All Other Compensation” for fiscal year 20162023 were the following items:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

​

    

Non-qualified 

    

​

    

​

    

​

    

​

​

​

​

​

deferred

​

​

​

​

​

​

​

​

​

​

401k Plan

​

comp plan

​

Allowances

​

Car Allowance

​

Other

​

Total

NEO

​

($) (i) 

​

($) (ii) 

​

($) (iii) 

​

($) (iv)

​

($) (v) 

​

($)

Frank Bozich

 

33,069

​

105,500

​

​

​

​

​

150

​

138,719

David Stasse

 

29,786

​

34,188

​

​

​

​

​

150

​

64,124

Angelo N. Chaclas

 

29,817

​

28,500

​

​

​

​

​

150

​

58,467

Han Hendriks

 

26,377

​

​

​

​

​

21,881

​

​

​

48,258

Paula Cooney

 

28,737

​

25,830

​

​

​

​

​

150

​

54,567

Andre Lanning

 

​

​

​

​

12,178

​

​

​

​

​

12,178

NEO

 

401k

Plan(i)

  

Non-qualified

deferred

comp plan(ii)

  

Dependent

Education(iii)

  

Executive

Education(iv)

  

Living

Stipend(v)

  

Tax

Gross-up(vi)

  Other(vii)  Total 

Christopher D. Pappas

 $21,327  $158,050   —   —   —   —  $1,584  $180,961 

Barry J. Niziolek

 $19,404   —   —   —   —   —  $731  $20,135 

Timothy M. Stedman

  —   —   —   —  $72,720  $51,036  $15,040  $138,796 

Hayati Yarkadas

  —   —  $93,200  $15,755   —  $58,175  $7,171  $174,301 

​

(i)Represents Company matching and discretionary contributions to the 401(k) Plan for Messrs. PappasBozich, Stasse, and Niziolek.Chaclas and Ms. Cooney, and contributions to a defined contribution plan for Mr. Hendriks.

(ii)Represents Company matching and discretionary contributions to ournon-qualified deferred compensation plan (such amounts are also included in the “U.S.“U.S. Non-Qualified Deferred Compensation Table”Table” below).

(iii)RepresentsThese amounts represent a family allowance (for children until age 16; and for education expenses provided to Mr. Yarkadas’ dependents, which primarily consists ofuntil age 25) offered by the payment of $89,765 of tuition for his two minor children provided for in his employment agreement, with the remainder being local language lessons for his spouse. Please see “—Narrative Disclosure to Summary Compensation Table and Grants of Plan Based Awards Table; Other Narrative Disclosure” for a description of Mr. Yarkadas’ employment agreement.Swiss government.

(iv)Represents reimbursements for executive and local language education for Mr. Yarkadas.This amount represents a car allowance offered to certain employees in the Netherlands in accordance with market practice.

(v)Represents Mr. Stedman’s temporary CHF 6,000 monthly incidental living expense allowance. Please see “—Narrative Disclosure to Summary Compensation Table and Grants of Plan Based Awards Table; Other Narrative Disclosure” for a description of Mr. Stedman’s employment agreement.

(vi)Mr. Stedman received agross-up for tax purposes on the living stipend paid to him. Mr. Yarkadas received agross-up for tax purposes on the tuition paid on behalf of his minor children. Please see “—Narrative Disclosure to Summary Compensation Table and Grants of Plan Based Awards Table; Other Narrative Disclosure” for a description of Messrs. Stedman’s and Yarkadas’ employment agreements.

(vii)Represents the aggregate of all other compensation items paid to the NEOs for personal benefits, which individually do not exceed $10,000. For Messrs. PappasBozich, Stasse, and NiziolekChaclas and Ms. Cooney, these amounts represent payment of group life insurance premiums. For Messrs. Stedman and Yarkadas, the amount in this column includes $7,915 and $7,171, respectively, for tax planning services. For Mr. Stedman, this column also includes $7,125 in personal commuting expenses paid to him under his employment agreement. Please see “—

​

​

Narrative Disclosure to Summary Compensation Table and Grants of Plan Based Awards Table; Other Narrative Disclosure2024 Proxy Statement” for a description of Mr. Stedman’s employment agreement.Graphic

46

​

(9)Compensation for Messrs. Pugh, Stedman and Yarkadas was paid or is payable in CHF. The amount of compensation earned or received during 2016, 2015, and 2014 was converted using the foreign exchange rate of US$1.01 to CHF1.00, US$1.037 to CHF1.00, and US$1.098 to CHF1.00, respectively. These rates have been determined by averaging the exchange rates in effect for each calendar year.

Table of Contents

EXECUTIVE COMPENSATION

Grant of Plan-Based Awards Table

The following table shows all plan-based awards granted to the NEOs during 2016.2023. All equity awards were granted under ourthe Equity Plan as a target percentage of each NEOs base salary with the target value of the equity award comprised of stock options (30%), RSUs (30%), and PSUs (40%) granted under the Company’s Amended & Restated 2014 Omnibus Incentive Plan (OIP).Plan. See “Compensation Discussion and Analysis—2023 Compensation Structure & Performance—Long-Term Equity Incentive Compensation” for more information regarding the 2022 equity awards. All NEOs earned cash incentive awards for 20162023 performance under the Company’s annual cash incentive plan (ACIP).ACI Plan. See “Compensation Discussion and Analysis—2023 Compensation Structure & Performance—Annual Cash Incentive Plan” above.

     

Estimated Future Payouts
Under Non-Equity
Plan Awards(1)

                

Name

 Grant
Date		  Threshold
($)		  Target
($)		  Maximum
($)		  All other
stock
awards:
Number
of
shares of
stock or
units (#)		  All other
option
awards:
Number of
securities
underlying
options (#)		  Exercise
or Base
Price of
Option
Awards
($/Sh)		  Closing
Stock
Price on
Grant
Date
($/Sh)		  Grant
Date
Fair Value
of Stock
and
Option
Awards
($)(2)		 

Christopher D. Pappas

         

OIP—Options

  2/22/2016   —   —   —   —   243,419   26.97   —  $2,409,702 

OIP—RSUs

  2/22/2016   —   —   —   91,769   —   —   26.97  $2,475,010 

ACIP

  2/18/2016   —   1,650,000   3,300,000   —   —   —   —   — 

Martin Pugh

         

OIP—Options

  2/22/2016   —   —   —   —   52,569   26.97   —  $520,402 

OIP—RSUs

  2/22/2016   —   —   —   19,819   —   —   26.97  $534,518 

ACIP

  2/18/2016   —   454,500   909,000   —   —   —   —   — 

2017 Proxy StatementLOGO33

EXECUTIVE COMPENSATION

     

Estimated Future Payouts
Under Non-Equity
Plan  Awards(1)

                

Name

 Grant
Date		  Threshold
($)		  Target
($)		  Maximum
($)		  All other
stock
awards:
Number
of
shares of
stock or
units (#)		  All other
option
awards:
Number of
securities
underlying
options (#)		  Exercise
or Base
Price of
Option
Awards
($/Sh)		  Closing
Stock
Price on
Grant
Date
($/Sh)		  Grant
Date
Fair Value
of Stock
and
Option
Awards
($)(2)		 

Barry J. Niziolek

         

OIP—Options

  6/22/2016   —   —   —   —   27,404   47.45   —  $387,964 

OIP—RSUs

  6/22/2016   —   —   —   8,167   —   —   47.45  $387,524 

ACIP

  6/21/2016   —   350,000   700,000   —   —   —   —   — 

Timothy M. Stedman

         

OIP—Options

  2/22/2016   —   —   —   —   22,530   26.97   —  $223,033 

OIP—RSUs

  2/22/2016   —   —   —   8,494   —   —   26.97  $229,083 

ACIP

  2/18/2016   —   272,700   545,400   —   —   —   —   — 

Hayati Yarkadas

         

OIP—Options

  2/22/2016   —   —   —   —   22,530   26.97   —  $223,033 

OIP—RSUs

  2/22/2016   —   —   —   8,494   —   —   26.97  $229,083 

ACIP

  2/18/2016   —   272,700   545,400   —   —   —   —   — 

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Estimated Future Payouts

​

Estimated Future Payouts

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Under Non-Equity Plan 

​

Under Equity Plan 

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Awards (1)

​

Awards (2)

​

​

​

​

​

​

​

​

​

​

​

   

​

   

​

   

​

   

​

   

​

   

​

   

​

   

All other

​

All other

​

​

​

​

​

Grant

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

stock

​

option

​

​

​

​

​

Date

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

awards:

​

awards:

​

Exercise

​

Closing

​

Fair Value

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Number

​

Number of

​

or Base

​

Stock

​

of Stock

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

of shares

​

securities

​

Price

​

Price on

​

and

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

of stock

​

underlying

​

of Option

​

Grant

​

Option

​

​

Grant

​

Threshold

​

Target

​

Maximum

​

Threshold

​

Target

​

Maximum

​

or units

​

options 

​

Awards 

​

Date

​

Awards

Name

​

Date

​

($) 

​

($) 

​

($) 

​

(#) 

​

(#) 

​

(#) 

​

(#) (3)

​

(#) (4) 

​

($/sh) 

​

($/sh) 

​

($) 

Frank A. Bozich

 

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Options

 

2/22/2023

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

121,823

​

24.08

​

—

​

1,322,998

RSUs

 

2/22/2023

​

—

​

—

​

—

​

—

​

—

​

—

​

54,942

​

—

​

—

​

24.08

​

1,323,004

PSUs

 

2/22/2023

​

—

​

—

​

—

​

5,494

​

73,256

​

146,512

​

—

​

—

​

—

​

24.08

​

1,481,969

ACI

 

1/1/2023

​

—

​

1,365,000

​

2,730,000

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

David Stasse

 

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Options

 

2/22/2023

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

31,996

​

24.08

​

—

​

347,477

RSUs (5)

 

2/22/2023

​

—

​

—

​

—

​

—

​

—

​

—

​

38,480

​

—

​

—

​

24.08

​

926,599

PSUs (5)

 

2/22/2023

​

—

​

—

​

—

​

3,247

​

43,290

​

86,580

​

—

​

—

​

—

​

24.08

​

875,757

ACI

 

1/1/2023

​

—

​

423,750

​

847,500

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

Angelo N. Chaclas

 

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Options

 

2/22/2023

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

23,481

​

24.08

​

—

​

255,004

RSUs (5)

 

2/22/2023

​

—

​

—

​

—

​

—

​

—

​

—

​

28,240

​

—

​

—

​

24.08

​

680,020

PSUs (5)

 

2/22/2023

​

—

​

—

​

—

​

2,383

​

31,770

​

63,540

​

—

​

—

​

—

​

24.08

​

642,708

ACI

 

1/1/2023

​

—

​

375,000

​

750,000

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

Han Hendriks

 

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Options

 

2/22/2023

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

10,260

​

24.08

​

—

​

111,424

RSUs

 

2/22/2023

​

—

​

—

​

—

​

—

​

—

​

—

​

4,627

​

—

​

—

​

24.08

​

111,419

PSUs

 

2/22/2023

​

—

​

—

​

—

​

463

​

6,170

​

12,340

​

—

​

—

​

—

​

24.08

​

124,820

ACI

 

1/1/2023

​

—

​

317,461

​

634,922

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

Paula Cooney

 

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Options

 

2/22/2023

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

17,022

​

24.08

​

—

​

184,859

RSUs

 

2/22/2023

​

—

​

—

​

—

​

—

​

—

​

—

​

7,677

​

—

​

—

​

24.08

​

184,863

PSUs

 

2/22/2023

​

—

​

—

​

—

​

768

​

10,236

​

20,472

​

—

​

—

​

—

​

24.08

​

207,075

ACI

 

1/1/2023

​

—

​

308,100

​

616,200

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

Andre Lanning

 

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Options

 

2/22/2023

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

20,295

​

24.08

​

—

​

220,404

RSUs

 

2/22/2023

​

—

​

—

​

—

​

—

​

—

​

—

​

9,153

​

—

​

—

​

24.08

​

220,405

PSUs

 

2/22/2023

​

—

​

—

​

—

​

915

​

12,204

​

24,408

​

—

​

—

​

—

​

24.08

​

246,887

ACI

 

1/1/2023

​

—

​

323,335

​

646,670

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

(1)Represents awards provided under our annual cash incentive planACI Plan discussed above under “See “Compensation Discussion and Analysis—2023 Compensation Elements—Structure & Performance—Annual Cash Incentive Plan”. The maximum amount represents two times the target amount. The actual amounts earned by the NEOs with respect to 20162023 are included in the“Non-Equity “Non-Equity Incentive Plan Compensation” column of the Summary Compensation Table above.

(2)Equity awards underThis column represents unvested PSUs granted in 2023. PSUs partially vest in four performance periods ending on each of the 2014 Omnibus Incentive Plan were granted based on a target percentagefirst, second and third year anniversary of the date of grant, subject to achieving certain TSR performance metrics during each vesting period. The number of PSUs that vest upon completion of each NEOs base salary with the target valueperformance period can range from 0 to 200% of the original grant.
(3)This column represents unvested RSUs granted in 2023. All RSUs vest in full on the third anniversary of the grant date.
(4)Option awards vest in three equal installments beginning on the first anniversary of the date of grant.
(5)In 2023 Mr. Stasse and Mr. Chaclas received a retention bonus equity award, generally being split evenly between option awardsin an amount equal to their ordinary annual long-term incentive award grants for 2023, comprised of 50% RSUs and RSUs. See50% PSUs. For more information, see “Compensation Discussion and Analysis—2023 Compensation Elements—Long-Term Equity Incentive CompensationStructure & Performance—Retention Awards.”” for more information regarding the 2016 equity awards.

​

47

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Table of Contents

EXECUTIVE COMPENSATION

Narrative Disclosure to Summary Compensation Table and Grants of Plan-Based Awards Table; Other Narrative Disclosure

Employment Agreements with Current Executives

Each NEO is employed by us pursuant to a written agreement of employment. We have entered into an executive employment agreementagreements with Mr. Pappas with hisBozich in December 2018, Mr. Stasse in April 2019, Mr. Chaclas in January 2020, Mr. Hendriks in August 2022 and Ms. Cooney in October 2021. Mr. Bozich’s employment commencing on June 17, 2010 and havingagreement provides for an initial three-year term, of three years. On April 11, 2013, the agreement with Mr. Pappas was amended and restated with retroactive effect as of January 2, 2013, and was extended until June 30, 2017. On March 30, 2016, Mr. Pappas’ agreement was amended again and was extended to December 31, 2018 and is subject to extension by mutual agreement between Mr. Pappas and the Company.

Mr. Niziolek entered into an employment agreement with the Company on June 13, 2016 with an initial term of one year, and subject to automaticone-year extensions beginning on the expiration of the initial term. Theterm, which may be terminated with at least one year prior written notice. Mr. Stasse’s, Mr. Chaclas’ and Ms. Cooney’s agreements provide for an initial term of one year and are subject to automatic extensionone-year extensions beginning on the expiration of the agreementinitial term, which may be terminated with at least 90 days’ prior written notice from Mr. Niziolekthe executive or the Company stating theirthe intent not to extend the employment term.

Messrs. Pugh, Stedman and Yarkadas have also entered into employment agreements with us with employment dates commencing on March 1, 2013 in the case of Mr. Pugh, and November 1, 2015 in the case of Messrs. Stedman and Yarkadas. Mr. Pugh’sHendriks’ employment agreement expired on the effective date of his retirement, March 1, 2017. The employment agreements with Messrs. Stedmanis for an indefinite term and Yarkadas have no fixed term but their agreements may be terminated by either party providing at least sixthe Company with 6 months’ prioradvance written notice and by Mr. Hendriks with 3 months’ advance written notice.

Under the terms of the intent to terminate.

Mr. Pappas istheir agreements, Messrs. Bozich, Stasse, Chaclas, Hendriks and Ms. Cooney were entitled to receive an annual base salary of $1,100,000 in 2016, $1,150,000 in 2017, and $1,200,000 in 2018 under his employment agreement. Under their agreements, Messrs. Pugh, Niziolek, Stedman and Yarkadas are entitled to receiveminimum annual base salaries in 20162023 of CHF 600,000,$1,050,000, $565,000, $500,000, CHF 450,000€490,000 and CHF 450,000,$513,500, respectively. These salaries are subject to annual review by the Board (or a committee thereof) during the first 90 days of each calendar year, and the base salary in respect of such calendar year may be increased above, but not decreased below, its level for the preceding calendar year. Each NEO is also entitled to participate in our employee and fringe benefit plans as may be in effect from time to time on the same general basis as our other employees.

34LOGO2017 Proxy Statement

EXECUTIVE COMPENSATION

Under their employment agreements, including increases approved by the compensation committee, Messrs. Pappas, Pugh, Niziolek, StedmanBozich, Stasse, Chaclas and YarkadasHendriks and Ms. Cooney had target bonus opportunities under our annual cash incentive planACI Plan equal to 150%130%, 75%, 70%75%, 60% and 60%, respectively, of their base salaries. For 2016, these2023, payouts to NEOs were paid abovebelow target, but belowbased on the plan maximum of 200%.Company’s underperformance compared to financial performance metrics. See “Compensation Discussion and Analysis—2023 Compensation Elements—Structure and Performance—Annual Cash Incentive Plan” for additional details on how the cash incentive awards were determined.In addition, following his start date in 2022, Mr. Hendriks also received a special one-time lump-sum cash incentive award of €250,000, which was payable as an advance on March 31, 2023 and which vests over two years subject to Mr. Hendriks’ continued employment. Under the terms of his employment agreement, Mr. Hendriks is also eligible for a monthly vehicle allowance which allowance was increased to €1,833 per month starting in April 2023.

Additionally, under theirEmployment Arrangements with Former Executives

Mr. Lanning entered into an employment agreements, Messrs. Stedmanagreement with the Company in October 2021 with an initial term of one year, and Yarkadas are entitledsubject to staggered signing bonuses to be paidautomatic one-year extensions beginning on the first, second,expiration of the initial term. The automatic extension of the agreement could be terminated with at least 90 days’ prior written notice from Mr. Lanning or the Company stating their intent not to extend the employment term. Mr. Lanning’s position was terminated in connection with a reorganization of the Company’s management team, and third anniversaries of their employment, and are contingent on their continued employment throughhis last day with the respective anniversary date. These staggered signing bonuses were negotiated by the executives to compensate them for forfeited equity compensation that they would have received had they stayed with their previous employers. For 2016, Messrs. Stedman and Yarkadas receivedlump-sum gross payments of CHF 455,000 and CHF 200,000, respectively. Subject to their continued employment for 2017 and 2018, Mr. Stedman will be entitled to his remaining staggered signing bonuses of CHF 455,000 and CHF 255,000, and Mr. Yarkadas will be entitled to his remaining staggered signing bonuses of CHF 280,000 and CHF 340,000, respectively.

Company was January 31, 2024. Under his employment agreement, during 2023 Mr. Stedman is requiredLanning was entitled to relocatereceive an annual base salary of CHF 487,200 and a target bonus opportunity under our annual cash incentive plan equal to the Zurich, Switzerland metropolitan area on the earlier of September 30, 2018, or the date his spouse relocates to this area. At the time60% of his relocation, Mr. Stedman will be eligible to receive relocation services. For fiscal 2016, Mr. Stedman received an aggregate of $72,720base salary. See “Compensation Discussion and Analysis—2023 Compensation Structure and Performance—Annual Cash Incentive Plan” for living expenses and $51,036 in taxgross-ups related these living expenses. Untiladditional details on how the earlier of September 30, 2018 or the date his spouse relocates to Zurich, Mr. Stedman receives a monthly allowance of CHF 6,000(grossed-up for tax at the marginal rate) for incidental living expenses while living in Zurich. During this period Mr. Stedman is also entitled to the reimbursement of the fare for one economy class flight taken per week between Switzerland and the United Kingdom. During 2016 Mr. Stedman received $7,125 in such commuting reimbursements.cash incentive awards were determined.

As part of his relocation to Zurich, Switzerland, the Company,Equity Awards under Mr. Yarkadas’ employment agreement, pays the tuition for the international school education,grossed-up for tax at the marginal rate, for period of 4 and 7 years for his oldest and youngest child, respectively. For fiscal 2016, the Company paid $89,765 in tuition for Mr. Yarkadas’ children for which Mr. Yarkadas also received $58,175 in taxgross-ups.Amended & Restated 2014 Omnibus Incentive Plan

Each of our NEOs participated in our 2014 Omnibus Incentive Plan. For 2016,Equity Plan in 2023. Messrs. Pappas, Pugh, Niziolek, StedmanBozich, Stasse, Chaclas and YarkadasHendriks and Ms. Cooney received an annual target equity incentive award under the planEquity Plan of 450%420%, 175%205%, 155%170%, 100%,70% and 100%,120% respectively, of their base salaries. The value of the equity award is split among stock options (30%), RSUs (30%), and PSUs (40%).

Restricted Stock Units. RSUs granted under the Equity Plan will vest in full on the third anniversary of the grant date, generally split evenly betweensubject to the executive’s continued employment with the Company on the vesting date. Upon a termination of employment due to the employee’s death or disability prior to the vesting date, termination without cause due to a restructuring or redundancy, or termination without cause within 2 years of a change in control, the RSUs will vest in full upon the employee’s termination date. Upon the employee’s retirement prior to the vesting date, the RSUs will continue to vest on the original vesting schedule. In the event the employee voluntarily resigns or is terminated for cause, all unvested RSUs will be forfeited. Upon vesting, for each RSU held by an award holder, such award holder will be entitled to an amount equal to any cash dividend or repayment of equity paid by the Company for one ordinary share during the vesting period (“dividend equivalents”). Award holders have no right to receive the dividend equivalents unless and options.until the associated RSUs vest. The dividend equivalents will be payable in cash and will not accrue interest.

​

2024 Proxy StatementGraphic

48

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Table of Contents

EXECUTIVE COMPENSATION

Performance Stock Units. PSUs granted under the Equity Plan in 2023 will vest during four performance periods, consisting of three one-year performance periods and one three-year performance period, which are each measured independently. Vesting will be calculated during each performance period, subject generally to the executive’s continued employment and based on the Company’s relative TSR performance, assuming the reinvestment of dividends, against the performance of all chemical and basic materials companies in the S&P 600 Small Cap Index. The percentage of the total PSU award that may vest during each performance period is as follows:

​

​

​

​

​

    

% of Award

    

Performance Period

​

Eligible for Vesting

 

2023

 

15%

​

2024

 

15%

​

2025

 

15%

​

2023 – 2025

 

55%

​

​

The percentage of PSUs that will vest during each performance period, based on TSR performance metrics, is generally as follows:

​

​

​

​

​

% of Target 

Trinseo Percentile Ranking Relative to Peer Group

​

Shares Vested*

Under 25th percentile

0%

​

25th percentile

50%

​

50th percentile

100%

​

75th percentile

200%

​

​

*

Vesting is interpolated between the 25th and 50th and between the 50th and 75th percentiles

Regardless of the foregoing targets, vesting of the PSUs is capped at 100% of target if the Company’s TSR is negative for the three-year performance period. Additionally, the total value of the awards delivered at vesting is capped at three times the target shares multiplied by the grant date share price. Because the Company assumes reinvestment of dividends, dividend equivalents accrue during the performance period. However, dividend equivalents will be paid only if, and to the extent, the PSUs vest, since we do not believe the executives should receive the benefit of such dividend earnings if the performance criteria associated with the PSU award is otherwise not met. PSUs which vest during each performance period will be delivered, in aggregate, on the third anniversary of the grant date.

Upon a termination of employment due to the employee’s death or disability prior to the vesting date, the performance vesting requirements will be deemed to have been met and a pro-rated portion of the PSUs will vest based on the employee’s termination date. Upon an employee’s retirement, a pro-rated portion of the PSUs will vest based on the employee’s termination date, subject to meeting the performance vesting requirements. If an employee is terminated without cause within 2 years of a change in control, the PSUs will vest based on a meeting the performance vesting requirements during the performance period ending on the date of the change in control. In the event the employee voluntarily resigns or is terminated for cause, all unvested PSUs will be forfeited.

Stock Options.The option awards issued under the 2014 Omnibus IncentiveEquity Plan, which contain an exercise term of nine years from the grant date, vest in three equal annual installments beginning on the first anniversary the grant date, generally subject to the employee remaining continuously employed on the applicable vesting date. Upon a termination of employment due to the employee’s death or disability prior to the vesting date, or termination without cause within 2 years of a change in control, the options will vest immediately. Upon the employee’s retirement or a termination of employment by the Company without cause in connection with a restructuring or redundancy or due to the employee’s disability prior to a vesting date, the options will vest in full or will continue to vest on the original vesting schedule, depending on the type of termination.schedule. In the event employmentthe employee voluntarily resigns or is terminated for cause, all vested and unvested options will be forfeited.

Retention Awards. In 2023 Mr. Stasse and Mr. Chaclas each received a retention equity award, in an amount equal to their annual target equity incentive award grants for 2023, comprised of 50% RSUs granted underand 50% PSUs. These awards are subject to the 2014 Omnibus Incentive Plan vestsame vesting conditions as their ordinary annual long-term incentive awards, with RSUs vesting in full on the third anniversary of the date of grant and PSUs partially vesting on each of the first, second and third year anniversary of the date of grant, subject to the Company’s relative TSR performance. The awards are generally subject to their continuous employment through the employee remaining continuously employed by the Company on theapplicable vesting date. Upon a termination of employment duedate, subject to the employee’s death or retirement or a termination of employment by the Company without cause in connection with a restructuring or redundancy or due to the employee’s disability prior to the vesting date, the RSUs will vest in full or in part, depending on the type of termination. In the event employment is terminated for cause, all unvested RSUs will be forfeited. Prior to November 2016, dividendtreatment set forth above. For more information, see “Compensation Discussion and dividend equivalents did not accumulate on unvested RSUs. In November 2016, the board of directors approved an amendment to all outstanding RSUs, entitling each award holder to an amount equal to any cash dividend or repayment of equity paid by the Company upon one ordinary share for each RSU held by the award holder (“dividend equivalents”) beginning in 2017. Award holders have no right to receive the dividend equivalents unless and until the associated RSUs vest. The dividend equivalents will be payable in cash and will not accrue interest.Analysis—2023 Compensation Structure & Performance—Retention Awards.”

​

​

49

Graphic2017       2024 Proxy Statement

LOGO35

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Table of Contents

EXECUTIVE COMPENSATION

Outstanding Equity Awards at FiscalYear-End Table

The table below sets forth certain information regarding outstanding and unvested equity awards held by the NEOs as of December 31, 2016.2023. The awards below represent RSUs, PSUs, and options issued under our Amended & Restated 2014 Omnibus Incentive Plan.

       Option Awards   Stock Awards 

Name

  Grant
Date		   Number of
Securities
Underlying
Unexercised
Options (#)
Exercisable		   Equity
Incentive Plan
Awards:
Number of
Securities
Underlying
Unexercised
Options (#)(1)
Unexercisable		   Option
Exercise
Price
($)		   Option
Expiration
Date		   Equity Incentive
Plan Awards:
Number of
Unearned Shares,
Units, or Other
Rights that have
Not
Vested (#)(2)		   Equity Incentive
Plan Awards:
Market or Payout
Value of
Unearned Shares,
Units or Other
Rights that
have Not  Vested
($)(3)		 

Christopher D. Pappas

   2/22/2016    —    243,419    26.97    2/22/2025    —    — 
   2/22/2016    —    —    —    —    91,769   $5,441,902 
   2/27/2015    90,797    181,594    18.14    2/27/2024    —    — 
   2/27/2015    —    —    —    —    115,776   $6,865,517 

Martin Pugh

   2/22/2016    —    52,569    26.97    2/22/2025    —    — 
   2/22/2016    —    —    —    —    19,819   $1,175,267 
   2/27/2015    19,314    38,630    18.14    2/27/2024    —    — 
    2/27/2015    —    —    —    —    24,626   $1,460,322 

Barry J. Niziolek

   6/22/2016    —    27,404    47.45    6/22/2025    —    — 
    6/22/2016    —    —    —    —    8,167   $484,303 

Timothy M. Stedman

   2/22/2016    —    22,530    26.97    2/22/2025    —    — 
    2/22/2016    —    —    —    —    8,494   $503,694 

Hayati Yarkadas

   2/22/2016    —    22,530    26.97    2/22/2025    —    — 
    2/22/2016    —    —    —    —    8,494   $503,694 

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Option Awards

​

Stock Awards

​

 

​

 

​

 

​

 

​

 

​

 

​

 

​

​

 

​

 

Equity

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Equity

​

Incentive Plan

​

​

​

​

​

​

Equity

​

​

​

​

​

Number

​

​

​

​

Incentive

​

Awards:

​

​

​

​

​

​

Incentive

​

​

​

​

​

of

​

Market

​

Plan Awards:

​

Market or

​

​

​

​

Number of

​

Plan Awards:

​

​

​

​

​

shares

​

value of

​

Number of

​

Payout Value

​

​

​

​

Securities

​

Number of

​

​

​

​

​

or units

​

shares or

​

Unearned

​

of Unearned

​

​

​

​

Underlying

​

Securities

​

​

​

​

​

of stock

​

units of

​

Shares, Units,

​

Shares, Units

​

​

​

​

Unexercised

​

Underlying

​

​

​

​

​

that have

​

stock that

​

or Other

​

or Other

​

​

​

​

Options

​

Unexercised

​

Option

​

Option

​

not

​

have not

​

Rights that

​

Rights that

​

​

​

​

(#) (1)

​

Options (#) (1)

​

Exercise

​

Expiration

​

vested

​

vested

​

have Not

​

have Not

Name

​

Grant Date

​

Exercisable

​

Unexercisable

​

Price ($)

​

Date

​

(#) (2)

​

($) (3)

​

Vested (#) (4)

​

Vested ($) (3)

Frank Bozich

​

2/22/2023

​

—

​

121,823

​

24.08

​

2/22/2032

​

54,942

​

$

459,865

​

73,256

​

$

613,153

​

​

2/16/2022

​

17,582

​

35,164

​

58.64

​

2/16/2031

​

20,413

​

$

170,857

​

27,217

​

$

227,806

​

​

2/17/2021

​

31,168

​

15,585

​

61.06

​

2/17/2030

​

17,626

​

$

147,530

​

23,501

​

$

196,703

​

​

2/25/2020

​

41,915

​

—

​

24.30

​

2/25/2029

​

—

​

​

—

​

—

​

​

—

​

​

3/4/2019

​

53,440

​

—

​

50.95

​

3/4/2028

​

—

​

​

—

​

—

​

​

—

David Stasse

​

2/22/2023

​

—

​

31,996

​

24.08

​

2/22/2032

​

38,480

​

$

322,078

​

43,290

​

$

362,337

​

​

2/16/2022

​

4,847

​

9,694

​

58.64

​

2/16/2031

​

5,628

​

$

47,106

​

7,503

​

$

62,800

​

​

2/17/2021

​

7,906

​

3,953

​

61.06

​

2/17/2030

​

4,471

​

$

37,422

​

5,961

​

$

49,894

​

​

2/25/2020

​

22,863

​

—

​

24.30

​

2/25/2029

​

—

​

​

—

​

—

​

​

—

​

​

2/26/2019

​

3,847

​

—

​

51.02

​

2/26/2028

​

—

​

​

—

​

—

​

​

—

​

​

2/22/2018

​

3,847

​

—

​

81.20

​

2/22/2027

​

—

​

​

—

​

—

​

​

—

​

​

2/16/2017

​

2,530

​

—

​

71.45

​

2/16/2026

​

—

​

​

—

​

—

​

​

—

Angelo Chaclas

​

2/22/2023

​

—

​

23,481

​

24.08

​

2/22/2032

​

28,240

​

$

236,369

​

31,770

​

$

265,915

​

​

2/16/2022

​

3,205

​

6,412

​

58.64

​

2/16/2031

​

3,722

​

$

31,153

​

4,962

​

$

41,532

​

​

2/17/2021

​

5,994

​

2,998

​

61.06

​

2/17/2030

​

3,390

​

$

28,374

​

4,520

​

$

37,832

​

​

2/25/2020

​

30,521

​

—

​

24.30

​

2/25/2029

​

—

​

​

—

​

—

​

​

—

​

​

2/26/2019

​

12,996

​

—

​

51.02

​

2/26/2028

​

—

​

​

—

​

—

​

​

—

​

​

2/22/2018

​

8,182

​

—

​

81.20

​

2/22/2027

​

—

​

​

—

​

—

​

​

—

​

​

2/16/2017

​

8,253

​

—

​

71.45

​

2/16/2026

​

—

​

​

—

​

—

​

​

—

Han Hendriks

​

2/22/2023

​

—

​

10,260

​

24.08

​

2/22/2032

​

4,627

​

$

38,728

​

6,170

​

$

51,643

​

​

10/3/2022

​

—

​

—

​

—

​

—

​

8,350

​

$

69,890

​

—

​

​

—

Paula Cooney

​

2/22/2023

​

—

​

17,022

​

24.08

​

2/22/2032

​

7,677

​

$

64,256

​

10,236

​

$

85,675

​

​

2/16/2022

​

2,644

​

5,288

​

58.64

​

2/16/2031

​

3,070

​

$

25,696

​

4,093

​

$

34,258

​

​

11/29/2021

​

—

​

—

​

—

​

—

​

2,020

​

$

16,907

​

—

​

​

—

Andre Lanning

​

2/22/2023

​

—

​

20,295

​

24.08

​

5/22/2026

​

9,153

​

$

76,611

​

12,204

​

$

102,147

​

​

2/16/2022

​

3,113

​

6,226

​

58.64

​

5/16/2025

​

3,614

​

$

30,249

​

4,819

​

$

40,335

​

​

2/17/2021

​

3,134

​

1,568

​

61.06

​

5/17/2024

​

1,773

​

$

14,840

​

2,364

​

$

19,787

​

​

2/25/2020

​

6,042

​

—

​

24.30

​

4/30/2024

​

—

​

​

—

​

—

​

​

—

(1)Option awards vest in three equal installments beginning on the first anniversary of the grant date.

(2)This column represents unvested RSUs. All RSU awards vest in full on the third anniversary of the grant date.date except for Mr. Hendriks’ sign-on award, granted on October 3, 2022, and Ms. Cooney’s sign-on award, granted November 2021, which vest ratably over three years.

(3)The market value of the RSU and PSU awards was calculated using the Company’s closing stock price on December 30, 201629, 2023 of $59.30.$8.37.
(4)This column represents unvested PSUs. PSU awards vest during four performance periods, consisting of three one-year performance periods and one three-year performance period, which are each measured independently, subject to achieving certain TSR performance metrics. The number of the PSUs that vest upon completion of the performance period can range from 0 to 200% of the original grant. The number of unvested PSUs was calculated assuming target (100%) achievement.

​

2024 Proxy StatementGraphic

50

​

Table of Contents

EXECUTIVE COMPENSATION

Options Exercised and Shares Vested Table

During 2016, no options were exercised by our NEOs and no awards held by our NEOs in shares of our Company’s publicly traded equity vested. The following table shows the number of ordinaryoptions exercised and the number of shares acquired by Messrs. Pappas and Pugh uponthrough the vesting of restricted shares ofRSU awards by our ParentNEOs during fiscal year 2016:2023.

​

​

​

​

​

​

​

​

​

​

​

​

Option Awards

​

Share Awards

​

    

Number of 

    

Value Realized 

    

Number of Shares 

    

Value Realized 

​

​

Options Exercised 

​

on Exercise 

​

Acquired on Vesting 

​

on Vesting 

Name

​

(#) 

​

($) 

​

(#) 

​

($) 

Frank A. Bozich

 

—

​

—

​

65,366

​

$

1,522,422

David Stasse

 

—

​

—

​

17,827

​

$

415,203

Angelo N. Chaclas

 

—

​

—

​

15,867

​

$

369,554

Han Hendriks

 

—

​

—

​

4,175

​

$

34,653

Paula Cooney

 

—

​

—

​

2,019

​

$

13,346

Andre Lanning

 

—

​

—

​

3,807

​

$

92,510

​

   Share Awards 

Name

  

Number of

Shares

Acquired on

Vesting (#)(1)

   

Value Realized

on Vesting ($)(2)

 

Christopher D. Pappas

   53,254   $12,089,962 

Martin Pugh

   12,392   $2,973,690 

(1)From 2010 through 2013, our former Parent granted various time-based and performance-based restricted stock awards to certain key members of management. All share awards acquired on vesting above are with respect to these stock awards of our former Parent’s ordinary shares. With the adoption of the Company’s 2014 Omnibus Plan, discussed above, restricted stock awards have not been issued by the former Parent on behalf of the Company. During 2016, our former Parent completed the sale of its ordinary shares of the Company through secondary offerings, and as a result, no longer holds any ownership interest in the Company. Pursuant to this sale, under the terms of the related security holder agreements for these awards, vesting of all outstanding restricted stock awards was fully accelerated during 2016.
(2)The value realized on vesting is based on the fair value per share of our Parent’s ordinary shares on the date of vesting.

36LOGO2017 Proxy Statement

EXECUTIVE COMPENSATION

U.S.Non-Qualified Deferred Compensation Table

The following table summarizes the activity during 2016,2023, as well as theyear-end account balances, in ournon-qualified savings and deferred compensation plan for Messrs. Bozich, Stasse and Chaclas and Ms. Cooney. Mr. Pappas. Mr. Niziolek wasHendriks is based in the Netherlands and is not eligible to participate in thisthe plan, until January 2017. Messrs. Pugh, Stedman and Yarkadas areMr. Lanning was based in Switzerland and didwas also not participate in this plan.eligible to participate. The plan allows eligible employees, including the NEOs, to defer a portion of their compensation (up to 75% of base salary and up to 100% of annual cash incentive awards) on apre-tax basis with a matching contribution from the Company, payable at a future date based on specific plan parameters. Additionally, the plan provides for discretionary company contributions in connection with earnings in excess of the limits under the Company’s 401(k) Plan.plan. While the plan is unfunded, amounts deferred under the plan are credited with earnings based on the performance of selected investment vehicles that are available in the open market. The plan is available to all U.S. employees who satisfy certain eligibility requirements, including the NEOs. An eligible participant can elect to receive a distribution under the plan in the form of a lump sum payment upon separation from service with the Company. Additionally, a participant may elect to receive a distribution at a specified future date in either a single lump sum or a series of annual installments over a period of 5 to 10 years. However, this latter distribution option is only available for the elective deferral of a participant’s base salary and annual cash incentive award. Company matching and discretionary contributions must be paid as a lump sum at separation from employment.

Name

  Executive
Contributions
in 2016 ($)(1)		   Company
Contributions
in 2016 ($)(2)		   Aggregate
Earnings
in 2016 ($)(3)		   Aggregate
Withdrawals/
Distributions
in 2016 ($)		   Aggregate
Balance as of
December 31, 2016 ($)(4)		 

Christopher D. Pappas

  $88,000   $158,050   $144,257   $—   $1,763,230 

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

​

    

​

    

​

    

Aggregate 

    

Aggregate 

​

​

Executive 

​

Company 

​

Aggregate 

​

Withdrawals/ 

​

Balance as of 

​

​

Contributions 

​

Contributions 

​

Earnings in 2023

​

Distributions 

​

December 31, 2023

Name

​

in 2023 ($) (1) 

​

in 2023 ($) (2) 

​

($) (3) 

​

in 2023 ($) 

​

($) (4) 

Frank Bozich

 

—

​

$

105,500

​

$

13,387

​

—

​

$

327,936

David Stasse

 

—

​

$

34,187

​

$

9,200

​

—

​

$

217,385

Angelo N. Chaclas

 

—

​

$

28,500

​

$

32,963

​

—

​

$

284,041

Paula Cooney

 

—

​

$

25,830

​

$

936

​

—

​

$

26,766

(1)Represents amountsthe amount contributed by Mr. Pappas under thenon-qualified savings and deferred compensation plan. These amounts are included in the Summary Compensation Table as part of “Salary.”

(2)Includes matching and discretionary amounts that were contributed by the Company under thenon-qualified savings and deferred compensation plan. These amounts are also included in the Summary Compensation Table in the “All Other Compensation” column.

(3)Represents earnings on account balances under the Company’snon-qualified savings and deferred compensation plan. Amounts are not reportedincluded as compensation in the Summary Compensation Table.

(4)Includes amounts that were reported as compensation in the Summary Compensation Table in 20162023 and prior years to the extent such amounts were contributed by the executive and the Company, but not to the extent that such amounts represent earnings.

​

51

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EXECUTIVE COMPENSATION

Pension and Other Postretirement Benefits

Switzerland Retirement Plan

The Switzerland retirement plan is a fully insured defined contribution pension plan. Future retirement benefits are calculated based on accumulated savings at retirement, which consists of savings contributions made by the employee and the Company, and an annually credited interest rate that is contingent upon investment results. Actual retirement benefits will be dependent on investment results, actual rate of interest applied on the savings capital, potential future changes in plan regulation and/or legal changes and future salary changes. The amount of pensionable salary is calculated using base pay plus the annual target bonus amount minus a coordination amount that reflects the maximum social security pension in place at the time, and is subject to a statutory maximum. Employee and Company contributions are based on the employee’s age and determined in accordance with the percentage of pensionable salary as follows:

​

​

​

​

​

​

​

    

Employee saving contributions 

    

Employer saving contributions 

 

Name

​

in % of pensionable salary 

​

in % of pensionable salary 

 

Andre Lanning

 

10%

​

10%

​

​

Name

  

Employee saving

contributions

in % of

pensionable salary

   

Employer saving

contributions

in % of

pensionable salary

 

Martin Pugh

   10.00%    10.00% 

Timothy M. Stedman

   8.00%    8.00% 

Hayati Yarkadas

   8.00%    8.00% 

In addition, the Company pays the total premiums for risk benefits and other costs. Benefits are paid as a monthly annuity, lump sum or a combination of these two payment forms.

Supplemental Employee Retirement Benefit

In 2010, we entered into an employment contract with Mr. Pappas which included a provision fornon-qualified supplemental employee retirement benefits. Mr. Pappas is 100% vested in these benefits and the accrued benefits will be paid to Mr. Pappas in

2017 Proxy StatementLOGO37

EXECUTIVE COMPENSATION

a lump sum within 30 days after his termination of employment. The amount payable to Mr. Pappas with respect to his supplemental employee retirement benefits is determined based on his years of Service Credit and his average base salary and target bonus for the three full calendar years prior to his termination. The accrued benefits are equal to the Basic Percentage times the average of his base salary plus target bonus for the three full calendar years prior to his termination (the “Final Average Pay”) plus the Supplemental Percentage times the Final Average Pay reduced by the36-month rolling average Social Security Taxable Wage Base as of the date of termination. The Basic Percentage and Supplemental Percentage are determined based on Mr. Pappas’ years of Service Credit, which are 425% and 120%, respectively.

The following table shows the actuarial present value of accumulated pension and other post-retirement benefits as of December 31, 2016:2023:

​

​

​

​

​

​

​

​

​

​

    

​

    

Number of Years of

    

Present Value of

    

​

​

​

​

​

Credited Service

​

Accumulated Benefit

​

Payments During 2023

Name

​

Plan Name

​

(#) (1)

​

($) (2)

​

($)

Andre Lanning

 

Switzerland Retirement Plan

 

6.5

​

812,984

​

—

Name

  Plan Name  

Number of

Years of

Credited

Service (#)(1)

   Present
Value of
Accumulated
Benefit ($)(2)		   Payments
During
2016 ($)		 

Christopher D. Pappas

  Supplemental Employee Retirement Plan   30.0   $13,784,371   $— 

Martin Pugh

  Switzerland Retirement Plan   10.5   $2,155,364   $— 

Barry J. Niziolek

  N/A   —   $—   $— 

Timothy M. Stedman

  Switzerland Retirement Plan   1.5   $163,198   $— 

Hayati Yarkadas

  Switzerland Retirement Plan   1.5   $162,184   $— 

​

(1)The years ofRepresents credited service for Mr. Pappas are determined pursuant to his employment agreement, under which he was granted 6 yearscalculating the present value of Service Credit at the start of his employmentaccumulated benefit and on each anniversary date, until he reached a maximum of 30 years. Mr. Pugh’s years of credited service include years that he was employed by a prior company,is not the same as required by Swiss law.actual service.

(2)The inputs and assumptions used to determine the present value of accumulated benefits are provided in the table below. These assumptions are consistent with the assumptions set forth in Note 1622 to the 20162023 consolidated financial statements filed with our Annual Report on Form10-K.

​

​

2024 Proxy StatementGraphic

52

​

   Discount rate   Salary increase* 

Supplemental Employee Retirement Plan

   1.37%           * 

Switzerland Retirement Plan

   0.67%    2.00% 

Table of Contents

*The salary increase assumption for Mr. Pappas under the Supplemental Employee Retirement Plan were the actual salary increases set forth in his employment agreement.

EXECUTIVE COMPENSATION

Payments upon Termination or Change in Control

Messrs. PappasBozich, Stasse and NiziolekChaclas and Ms. Cooney

In the event of an executive’s termination of employment for any reason, Messrs. PappasBozich, Stasse and NiziolekChaclas and Ms. Cooney will each be entitled to receive any unpaid base salary through the date of termination and all accrued and vested benefits under our vacation and other benefit plans and, except in the case of a termination by us for “cause” or by the executive without “good reason” (each, as defined in the executive’s employment agreement), (i) any annual bonus earned but unpaid with respect to the calendar year ending on or preceding the date of termination and (ii) a pro rata target bonus for the calendar year of termination.

Under Mr. Pappas’ agreement, in the event of his voluntary termination of employment without “good reason,” he shall provide the Company with one year’s written notice. In the event his termination date is less than one year following his written notice of termination, Mr. Pappas would not receive the pro rata target bonus for the calendar year of termination.

In addition to the severance benefits described above, upon termination of an executive without “cause” or by the executive for “good reason,” the executive will be entitled to receive the following severance benefits, subject to the executive’s timely execution of a general release of claims.

In the case of Mr. Pappas, he willBozich, in the event of his termination by the Company without “cause” or if Mr. Bozich terminated his employment for “good reason”, Mr. Bozich would be entitled to receive a severance payment equal to 2.0 times the sum of his annual base salary and target bonus, payable in equal monthly installments over the 24 month24-month period following such termination, and, ifhis termination. Additionally, Mr. PappasBozich is participating in the Company’s health plans at the time of his termination,eligible to receive continued health benefits for a period of 24 months following such termination, provided, however, that if he obtains other employment that offers group health benefits, such continued insurance coverage will terminate.terminate, or enrolls in coverage through Medicare, a spousal plan, or an insurance exchange other than COBRA, the Company will pay Mr. Bozich the amount equivalent to the Company’s share of COBRA premiums for 24 months as if Mr. Bozich had enrolled in COBRA. To the extent that Mr. Bozich experiences a termination of employment by us without “cause” or for “good reason” within two years following a “change in control” (as defined in his agreement), the cash severance benefits described above will be (or would have been) equal to 3.0 times his annual base salary and target bonus, paid in a cash lump sum as opposed to in installments.

In the case of Mr. Niziolek, heStasse, Mr. Chaclas, and Ms. Cooney, each will be entitled to receive, subject to the timely execution of a general release of claims (i) an amounta severance payment equal to 1.5 times the sum of his or her respective base salary and target bonus, payable in equal monthly installments over the 18 month18-month period following suchhis or her termination, and

38LOGO2017 Proxy Statement

EXECUTIVE COMPENSATION

(ii) 18 months of health benefits continuation, provided, however, that if he or she obtains other employment that offers group health benefits, such continued insurance coverage will terminate.

To the extent that any executive experiences a termination of employment by us without “cause” or by the executive for “good reason” within two years following a “change in control” (as defined in the agreements), the cash severance benefits described aboveexecutive will be (or would have been) paid to such executive inreceive a cash lump sum as opposedpayment equal to 2.0 times the sum of his or her respective base salary and target bonus in installments. In addition, in the case of Mr. Pappas, to the extent that the severance payments and benefits payable under his agreement would cause him to be liable for excise taxes by reasonlieu of the application of Sections 280G and 4999 of the Code, and the Company’s equity securities are publicly traded on an established securities market in accordance with Section 280G, Mr. Pappas will be entitled to an additional “gross up” payment to indemnify him for the effect of the excise taxes.health benefits continuation described above.

For Mr. Niziolek,Messrs. Bozich, Stasse and Chaclas and Ms. Cooney, to the extent that any payments that are considered to be contingent on a change in control would be subject to Sections 280G and 4999 of the Code, such payments will be limitedreduced if the net benefit to himthem on anafter-tax basis would be greater than receiving the full value of all payments and paying the excise tax. The amounts in the table assume that the full amounts were paid to the executives, without any limitation.

To the extent that any portion of either Messrs. Pappas’Bozich’s, Stasse’s and Chaclas’ or Niziolek’sMs. Cooney’s severance amount due to a termination of employment by us without “cause” or by the executive for “good reason” constitutes nonqualified deferred compensation for purposes of Section 409A of the Internal Revenue Code, any payment scheduled to occur during the first 60 days following his termination of employment shall not be paid until the 60th day6 months following his termination.

The agreements with Messrs. PappasBozich, Stasse and NiziolekChaclas and Ms. Cooney contain anon-competition covenant that prohibits the executive from competing against us for a period of two years in the case of Mr. Pappas, and a period of one year, in the case of Mr. Niziolek, following termination of employment. These agreements also containnon-solicitation provisions that prohibit the executive from actively soliciting our employees, customers or suppliers during the period of employment and for a period of two years in the case of Mr. Pappas, and a period of one year, in the case of Mr. Niziolek, following termination of employment. The executives are also subject to perpetual confidentiality restrictions that protect our proprietary information, developments and other intellectual property.

Messrs. Pugh, Stedman, and YarkadasMr. Hendriks

In the event of termination of his or her employment for any reason, Messrs. Pugh, Stedman, and YarkadasMr. Hendriks will each be entitled to receive any unpaid base salary through thehis date of termination and all accrued and vested benefits under our vacation and other benefit plans and, except in the case of a termination by us for “cause” or by him without “good reason” (each, as defined in his employment agreement)the executive (i) any annual bonus earned but unpaid with respect to the calendar year ending on or preceding the date of termination; and (ii) an amount equal to thepro-rata portion of his or her target bonus for the calendar year of termination. Messrs. Stedman and YarkadasMr. Hendriks will also each receive payments required by applicable law upon a termination by reason of disability, as described in the table below.

In addition to the severance benefits described above, upon either Messrs. Stedman’s or Yarkadas’ termination of Mr. Hendriks by us without “cause” or by him for “good reason,” Messrs. Stedman and Yarkadas, he will each be entitled to receive the following severance benefits, subject to his timely execution of a general release of claims inclaims. Mr. Hendriks’ severance

​

53

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Table of Contents

EXECUTIVE COMPENSATION

benefits will be an amount equal to 1.51.0 times of the sum of his annual base salary and target bonus.bonus, payable in equal monthly installments over the 18-month period following such termination. To the extent that either executivehe experiences a termination of employment by us without “cause” or by him for “good reason” within two years following a “change in control” (as defined in his agreement), the cash severance benefits described aboveMr. Hendriks will be paid to him inreceive a cash lump sum as opposedpayment equal to in installments.

Mr. Pugh retired effective March 1, 2017. His agreement contained virtually identical terms to those2.0 times the sum of Messrs. Stedmanhis base salary and Yarkadas, with respect to his termination for cause or with good reason, as well as in the event of a change in control. Under the first amendment to his employment agreement, Mr. Pugh was eligible to receive a retirement allowance of $202,138 which was paid in March 2017.target bonus.

The agreements for Messrs. Pugh, Stedman, and Yarkadas eachMr. Hendriks contain anon-competition covenant that prohibits each executive from competing against us, for a period of 18 months following his termination of employment. The agreement also containsand non-solicitation provisions that prohibit each executive from actively soliciting our employees, customers or suppliers, during the period of employment and for a period of 6 monthstwo years, following his termination. Each executive istermination of employment. Mr. Hendriks are also subject to perpetual confidentiality restrictions that protect our proprietary information, developments and other intellectual property.

2017 Proxy StatementLOGO39

EXECUTIVE COMPENSATION

Potential Payments

The following table provides examples of the potential payments upon termination or upon a termination following a change in control to our NEOs, as if such event(s) took place on December 31, 20162023 (the last business day of our most recent fiscal year). The amounts reflected in this table were determined in accordance with each NEO’s then existing employment agreement.

Amounts shown do not include (i) accrued but unpaid salary and vested benefits, including pension (as described above) and (ii) other benefits earned or accrued by the named executive officer during his or her employment that are available to all salaried employees and that do not discriminate in scope, terms or operations in favor of executive officers. With respect to any termination of employment, each NEO is entitled to receive accrued but unpaid base salary through the date of termination of employment, accrued but unpaid vacation and pension benefits (as described above) through such date, and, in the case of a termination due to death, earned but unpaid bonus, if any, for the immediately preceding calendar year and apro-rata bonus for the year of termination.

​

​

​

​

​

​

​

​

​

Cash Separation

Value of Unvested

Health and Welfare

Value of Insurance

​

​

​

Payment 

Equity Awards 

Benefits 

Benefit 

​

Name

Termination Trigger 

($) (1) 

($) (2) 

($) (3) 

($) (4) 

Total ($)

Frank Bozich

Termination Without Cause

4,830,000

845,529

15,968

—

5,710,380

​

Death

—

1,428,154

—

500,000

1,928,154

​

Disability

—

1,428,154

—

250,000

1,678,154

​

Retirement

—

1,417,764

—

—

1,417,764

​

Change in Control

7,245,000

1,997,137

15,968

—

9,276,988

David Stasse

Termination Without Cause

1,483,125

428,247

20,636

—

1,953,405

​

Death

—

638,169

—

500,000

1,138,169

​

Disability

—

638,169

—

250,000

888,169

​

Retirement

—

635,533

—

—

635,533

​

Change in Control

1,977,500

936,997

20,636

—

2,956,530

Angelo Chaclas

Termination Without Cause

1,312,500

311,370

16,227

—

1,668,197

​

Death

—

463,685

—

500,000

963,685

​

Disability

—

463,685

—

250,000

713,685

​

Retirement

—

461,687

—

—

461,687

​

Change in Control

1,750,000

681,000

16,227

—

2,475,328

Han Hendriks

Termination Without Cause

846,563

116,038

—

—

962,601

​

Death

—

130,657

—

—

130,657

​

Disability

—

130,657

—

—

130,657

​

Retirement

—

130,657

—

—

130,657

​

Change in Control

1,693,126

168,668

—

—

1,861,794

Paula Cooney

Termination Without Cause

1,232,400

109,812

15,968

—

1,355,444

​

Death

—

164,855

—

500,000

664,855

​

Disability

—

164,855

—

250,000

414,855

​

Retirement

—

158,603

—

—

158,603

​

Change in Control

1,643,200

243,530

15,968

—

1,899,962

Name

 

  

Termination

Trigger

 

  

Cash
Separation
Payment
($)(1)

 

   

Health and
Welfare
Benefits
($)(2)

 

   

Value of
Previously
Unvested
Equity
Awards (3)

 

   

Value of
Insurance
Benefit
($)(4)

 

   

280G
Gross-Up
($)(5)

 

 

 

Christopher D. Pappas

  

 

Termination for Cause

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

Termination Without Cause

  

 

$

 

5,500,000

 

 

  

 

$

 

30,050

 

 

  

 

$

 

21,051,378

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

Death

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

27,651,564

 

 

  

 

$

 

500,000

 

 

  

 

$

 

—

 

 

  

 

Disability

  

 

$

 

—

 

 

  

 

$

 

30,050

 

 

  

 

$

 

27,651,564

 

 

  

 

$

 

250,000

 

 

  

 

$

 

—

 

 

   

 

Change in Control

  

 

$

 

5,500,000

 

 

  

 

$

 

30,050

 

 

  

 

$

 

27,651,564

 

 

  

 

$

 

—

 

 

  

 

$

 

4,039,324

 

(6) 

 

Martin Pugh

  

 

Termination for Cause

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

Termination Without Cause

  

 

$

 

1,590,750

 

 

  

 

$

 

—

 

 

  

 

$

 

4,508,448

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

Death

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

5,925,155

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

Disability

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

5,925,155

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

   

 

Change in Control

  

 

$

 

1,590,750

 

 

  

 

$

 

—

 

 

  

 

$

 

5,925,155

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

 

Barry J. Niziolek

  

 

Termination for Cause

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

Termination Without Cause

  

 

$

 

1,275,000

 

 

  

 

$

 

—

 

 

  

 

$

 

405,455

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

Death

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

809,041

 

 

  

 

$

 

500,000

 

 

  

 

$

 

—

 

 

  

 

Disability

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

809,041

 

 

  

 

$

 

250,000

 

 

  

 

$

 

—

 

 

   

 

Change in Control

  

 

$

 

1,275,000

 

 

  

 

$

 

—

 

 

  

 

$

 

809,041

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

 

Timothy M. Stedman

  

 

Termination for Cause

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

Termination Without Cause

  

 

$

 

1,090,800

 

 

  

 

$

 

—

 

 

  

 

$

 

868,310

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

Death

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

1,232,089

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

Disability

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

1,232,089

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

   

 

Change in Control

  

 

$

 

1,090,800

 

 

  

 

$

 

—

 

 

  

 

$

 

1,232,089

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

 

Hayati Yarkadas

  

 

Termination for Cause

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

Termination Without Cause

  

 

$

 

1,090,800

 

 

  

 

$

 

—

 

 

  

 

$

 

868,310

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

Death

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

1,232,089

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

Disability

  

 

$

 

—

 

 

  

 

$

 

—

 

 

  

 

$

 

1,232,089

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

   

 

Change in Control

  

 

$

 

1,090,800

 

 

  

 

$

 

—

 

 

  

 

$

 

1,232,089

 

 

  

 

$

 

—

 

 

  

 

$

 

—

 

 

​

(1)Cash separation payments are generally payable in installments except for payments upon a change in control, which are generally payable in a lump sum.

(2)Mr. Niziolek did not participate in our health and welfare benefit plans as of December 31, 2016. Messrs. Pugh, Stedman, and Yarkadas receive government sponsored health and welfare benefits, and therefore, do not participate in the Company’s health and welfare benefit plans.

(3)Represents the value associated with equity awards issued under our 2014 Omnibus IncentiveEquity Plan, described in “—Narrative“Narrative Disclosure to Summary Compensation Table and Grants of Plan-Based Awards Table” above.Table” above and dividend equivalents paid, as applicable on these awards. Under our Equity awards under our 2014 Omnibus Incentive Plan, RSUs and options vest in full upon death, disability, or a change in control, and vest in part in certain circumstances when termination is without cause. PSUs vest in full upon a change in control, and vest in part upon death or disability. The value of the equity awards granted under our 2014 Omnibus IncentiveEquity Plan was calculated using the Company’s closing stock price on December 31, 20162023 of $59.30.$8.37. While the number of PSUs that

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vest can range from 0 to 200% of the original grant, the information in the table above was calculated presuming performance was at target, and therefore 100% of the original grant.
(3)Mr. Hendriks receives government sponsored health and welfare benefits, and therefore, does not participate in the Company’s health and welfare benefit plans.
(4)Represents the maximum value of insurance payable on death due to accident or dismemberment or in the event of permanent disability. The insurance death benefit would only be $250,000, where the executive’s death was due to a cause other than accident or dismemberment. Employees in Switzerlandthe Netherlands are not covered under the employee life insurance policy and only receive applicable social system death benefits.

​

​

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Pay Versus Performance Table

​

​

​

​

​

​

​

​

​

​

​

Summary 

​

Average

​

Value of Initial Fixed

​

​

​

Compensation 

​

Summary 

Average

 $100 Investment 

​

​

​

Table Total for

​

 Compensation 

Compensation

Based On:

​

​

​

 Principal

​

Table Total for

Actually Paid to

​

Peer Group

​

​

​

Executive

Compensation

Non-PEO Named

Non-PEO Named

Total

Total

Net (loss)

Adjusted EBITDA 

​

Officer

Actually Paid to

  Executive Officers

Executive Officers

 Shareholder

Shareholder

 income 

(non-GAAP) 

Year

(PEO) ($) (1)

PEO ($) (3)

($) (2)

($) (3)

Return ($)

Return ($) (4)

($ in millions)

($ in millions) (5)

2023

5,779,845

2,320,488

1,923,323

749,721

26

146

(701.3)

154.3

2022

5,793,583

(1,961,363)

1,561,047

305,441

68

132

(430.9)

311.7

2021

7,001,892

6,409,637

1,747,866

1,868,496

151

149

440.0

729.4

2020

5,035,919

11,989,919

1,524,437

1,670,250

149

118

7.9

285.1

​

(1)Mr. Bozich served as the Company’s PEO (President and CEO) for each year presented.
(2)The Company’s Non-PEO NEOs were: (i) in 2023, Mr. Stasse, Mr. Chaclas, Ms. Cooney and Mr. Hendriks, and Andre Lanning (as former NEO); (ii) in 2022, Mr. Stasse, Mr. Chaclas, Andre Lanning and Ms. Cooney (iii) in 2021, Mr. Stasse, Mr. Chaclas, Andre Lanning and Francesca Reverberi, and (iv) in 2020, Mr. Stasse, Mr. Chaclas, Andre Lanning and Alice Heezen, and Timothy Stedman (as former NEO).
(3)The following table provides additional information as to the amounts deducted from and added to Summary Compensation Table (“SCT”) total compensation for the applicable year pursuant to Item 402(v) of Regulation S-K to determine “compensation actually paid” to the PEO and Non-PEO NEOs:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

PEO (a)

​

2023

​

2022

​

2021

​

2020

Summary Compensation Table – Total Compensation

​

$

5,779,845

​

$

5,793,583

​

$

7,001,892

​

$

5,035,919

Subtract fair value of stock awards and options awards granted in fiscal year

​

$

(4,127,971)

​

$

(3,959,041)

​

$

(3,587,469)

​

$

(2,762,319)

Add fair value of current-year equity awards outstanding and unvested as of year-end

​

$

1,071,413

​

$

1,141,272

​

$

2,944,350

​

$

7,738,325

Add fair value of current-year equity awards that vested during the fiscal year

​

$

0

​

$

0

​

$

0

​

$

0

Add/subtract change in fair value of prior-year equity awards

​

$

(1,111,075)

​

$

(5,226,633)

​

$

(635,819)

​

$

2,061,466

Add/subtract change in fair value as of vesting date of prior-year equity awards vested during fiscal year

​

$

807,733

​

$

473,289

​

$

686,682

​

$

(83,472)

Subtract fair value of prior-year awards forfeited during fiscal year

​

$

(99,457)

​

$

(183,833)

​

$

0

​

$

0

Compensation Actually Paid

​

$

2,320,488

​

$

(1,961,363)

​

$

6,409,637

​

$

11,989,919

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Average Non-PEO Named Executive Officers (a)

    

2023

​

2022

​

2021

​

2020

Summary Compensation Table – Average Total Compensation

​

$

1,923,323

​

$

1,561,047

​

$

1,747,866

​

$

1,524,437

Subtract fair value of stock awards and options awards granted in fiscal year

​

$

(1,067,944)

​

$

(777,406)

​

$

(600,379)

​

$

(554,922)

Add fair value of current-year equity awards outstanding and unvested as of year-end

​

$

290,243

​

$

224,104

​

$

492,497

​

$

1,111,350

Add fair value of current-year equity awards that vested during the fiscal year

​

$

0

​

$

0

​

$

0

​

$

0

Add/subtract change in fair value of prior-year equity awards

​

$

(191,378)

​

$

(754,874)

​

$

13,556

​

$

164,755

Add/subtract change in fair value as of vesting date of prior-year equity awards vested during fiscal year

​

$

68,982

​

$

25,904

​

$

123,014

​

$

(22,736)

Subtract fair value of prior-year awards forfeited during fiscal year

​

$

(10,253)

​

$

(5,841)

​

$

(24,085)

​

$

0

Subtract change in present value of accumulated benefit under all defined benefit and actuarial pension plans

​

$

(274,313)

​

$

(124,783)

​

$

(44,879)

​

$

(924,273)

Add pension value attributable to current year and change in pension value attributable to plan amendments made in the current year

​

$

11,061

​

$

157,290

​

$

160,906

​

$

371,637

Compensation Actually Paid

​

$

749,721

​

$

305,441

​

$

1,868,496

​

$

1,670,250

​

(a)The fair value of equity awards were calculated using valuation assumptions that materially differ from those disclosed at the time of grant, including: (1) the fair value of RSU awards was calculated using the closing price of our common stock as of the last day of the applicable year or on the date of vesting, as applicable; (2) the fair value of PSU awards was estimated using the Monte Carlo Simulation method (which reflects for each particular award and valuation date adjustments for: actual performance, expected volatility, risk-free interest rate, correlation coefficient, and accrued dividends); and (3) the fair value of options was estimated using the Black-Scholes option-pricing model (which reflects, for each particular award and valuation date, adjustments for expected volatility, risk-free interest rate, dividend yield, expected term (calculated using the simplified method) and stock price).
(4)The Company’s peer group is the S&P 500 Chemicals Industry GICS Level 3 Index. This index is the published line-of-business index utilized in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023.

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(5)Mr. Pappas would be subjectAdjusted EBITDA is our primary non-GAAP financial measure. See “Use of Non-GAAP Measures” below for a definition of Adjusted EBITDA, an explanation of why we believe this measure is useful to theso-called golden parachute taxinvestors and entitledthe limitations of this measure.

Most Important Financial Measures

Below is an unranked list of the most important financial measures the Company used during 2023 to link Company performance to executive compensation actually paid.

Adjusted EBITDA*

Free Cash Flow*

Capital Expenditures

Total Shareholder Return

​

*

See “Use of Non-GAAP Measures” below for a reconciliation of Adjusted EBITDA and Free Cash Flow, which are non-GAAP measures, to Net Income (Loss) and Cash provided by operating activities.

Relationship between Pay and Performance Graphs

Below are graphs showing the relationship of “compensation actually paid” (CAP) to our Chief Executive Officer and other named executive officers in 2020, 2021, 2022 and 2023 to (1) Trinseo’s Adjusted EBITDA*, (2) Trinseo’s net income, and (3) Cumulative TSR of Trinseo and the S&P 500 Chemicals Industry GICS Level 3 Index. The charts reflect that the CAP over the four-year period ended December 31, 2023 aligns to our results over the same period. In 2023 and 2022, lower performance resulted in a zero payout under the financial performance metric of our ACI Plan and led to lower or negative CAP for the CEO and NEOs. In 2021, CAP for our CEO and other NEOs was primarily impacted by Trinseo’s outperformance of its financial metrics under its ACI Plan.

Graphic

*

See “Use of Non-GAAP Measures” below for a definition of Adjusted EBITDA, an excise taxgross-up inexplanation of why we believe this measure is useful to investors and the amount set forth above assuming a changelimitations of control and his accompanying termination of employment occurredthis measure.

​

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Graphic

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Use of Non-GAAP Measures

We present Adjusted EBITDA as an important non-GAAP financial performance measure, which we define as income from continuing operations before interest expense, net; income tax provision; depreciation and amortization expense; loss on extinguishment of long-term debt; asset impairment charges; gains or losses on the dispositions of businesses and assets; restructuring charges; acquisition related costs and benefits, and other items. In doing so, we are providing management, investors, and credit rating agencies with an indicator of our ongoing performance and business trends, removing the impact of transactions and events that we would not consider a part of our core operations.

There are limitations to using the financial performance measures noted above. These performance measures are not intended to represent net income or other measures of financial performance. As such, they should not be used as alternatives to net income as indicators of operating performance. Other companies in our industry may define these performance measures differently than we do. As a result, it may be difficult to use these or similarly-named financial measures that other companies may use, to compare the performance of those companies to our performance. We compensate for these limitations by providing reconciliations of these performance measures to our net income, which is determined in accordance with GAAP.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

December 31, 

(In millions, except per share data)

​

2023

​

2022

​

2021

​

2020

Net income (loss)

 

$

(701.3)

 

$

(430.9)

 

$

440.0

 

$

7.9

Net income (loss) from discontinued operations

​

​

​

​

​

(2.9)

​

​

160.4

​

​

(54.8)

Net income (loss) from continuing operations

​

​

(701.3)

 

$

(428.0)

 

$

279.6

 

$

62.7

Interest expense, net

​

​

188.4

​

​

112.9

​

​

79.4

​

​

43.6

Provision for (benefit from) income taxes

    

 

68.4

    

 

(41.6)

    

 

70.9

    

 

42.7

Depreciation and amortization

​

 

221.2

​

 

236.9

​

 

167.5

​

 

134.3

EBITDA

​

$

(223.3)

​

$

(119.8)

​

$

597.4

​

$

223.6

Net gain on disposition of businesses and assets (a)

​

 

(25.6)

​

 

(1.8)

​

 

(0.6)

​

 

(0.4)

Restructuring and other charges (b)

​

 

31.4

​

 

15.9

​

 

9.0

​

 

9.9

Acquisition transaction and integration net costs (c)

​

 

(1.4)

​

 

6.6

​

 

75.3

​

 

9.1

Acquisition purchase price hedge (gain) loss (d)

​

 

—

​

 

—

​

 

22.0

​

 

(7.3)

Asset impairment charges or write-offs (e)

​

 

2.7

​

 

6.3

​

 

6.8

​

 

39.1

European Commission request for information (f)

​

 

—

​

 

36.2

​

 

—

​

 

—

Goodwill impairment charge (g)

​

 

349.0

​

 

297.1

​

 

—

​

 

—

Other items (h)

​

 

21.5

​

 

71.2

​

 

19.5

​

 

25.5

Adjusted EBITDA

​

$

154.3

​

$

311.7

​

$

729.4

​

$

285.1

​

(a)Amounts for the year ended December 31, 2016. The amount above assumes that (a) Company equity award granted within one year2023 primarily relate to the sale of the change in control transaction were presumedMatamoros, Mexico manufacturing facility.
(b)Restructuring and other charges for 2023, 2022 and 2021 primarily relate to be in contemplation of the transaction, (b) all outstanding equity awards under our 2014 Omnibus Incentive Plan are cashed outcharges incurred in connection with the applicable eventCompany’s various restructuring programs.
(c)Acquisition transaction and valued using aintegration net costs for the years ended December 31, 2023, 2022 and 2021 relate to expenses incurred for the acquisition of the PMMA business from Arkema and the acquisition of Aristech Surfaces in 2021.
(d)Acquisition purchase price per sharehedge loss for 2021 relates to the change in fair value of $59.30the Company’s forward currency hedge arrangement that economically hedges the euro-denominated purchase price of the acquisition of the Arkema PMMA business.
(e)Asset impairment charges for primarily relate to the impairment of the Company’s styrene monomer assets in Boehlen, Germany. Asset impairment charges or write-offs for 2020 also relate to the impairment of the Company’s polybutadiene rubber (nickel and (c) a marginal taxneodymium-PBR) assets in Schkopau, Germany.
(f)Amounts for 2022 relate to the liability recorded in connection with the European Commission request for information, adjusted for foreign exchange rate impacts, which was subsequently paid in full in December 2022.
(g)Amounts for 2022 relate to the goodwill impairment of 45% is applied.the acquired Arkema PMMA business and Aristech Surfaces reporting units.

​

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(h)Other items for the 2023, 2022 and 2021 periods primarily relate to fees incurred in conjunction with certain of the Company’s strategic initiatives, including costs related to our enterprise resource planning system upgrade project. Other items for 2020 primarily relate to advisory and professional fees incurred in conjunction with our initiative to transition business services from Dow.

The Company also uses Free Cash Flow as an important non-GAAP financial measure, to evaluate and discuss its liquidity position and results. Free Cash Flow is defined as cash from operating activities, less capital expenditures. We believe that Free Cash Flow provides an indicator of the Company’s ongoing ability to generate cash through core operations, as it excludes the cash impacts of various financing transactions as well as cash flows from business combinations that are not considered organic in nature. We also believe that Free Cash Flow provides management and investors with useful analytical indicators of our ability to service our indebtedness, pay dividends (when declared), and meet our ongoing cash obligations.

Free Cash Flow is not intended to represent cash flows from operations as defined by GAAP, and therefore, should not be used as alternatives for that measure. Other companies in our industry may define Free Cash Flow differently than we do. As a result, it may be difficult to use this or similarly-named financial measures that other companies may use, to compare the liquidity and cash generation of those companies to our own. The Company compensates for these limitations by providing the following detail, which is determined in accordance with GAAP.

Free Cash Flow

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Year Ended December 31, 

(In millions)

  

2023

  

2022

  

2021

  

2020

Cash provided by operating activities

​

$

148.7

​

$

43.5

​

$

452.7

​

$

255.4

Capital expenditures

​

$

(69.7)

​

$

(149.0)

​

$

(123.5)

​

$

(82.3)

Free Cash Flow

​

$

79.0

​

$

(105.5)

​

$

329.2

​

$

173.1

​

​

​

​

​

​

​

(6)

2024 Proxy StatementGraphic

The figure set forth above is calculated by including amounts that are not taxable as compensation for federal tax purposes and, accordingly, may not be subject to the excise tax imposed under Section 4999 of the U.S. Tax Code. As a result, the amount disclosed above may overstate the amount of any required gross up.

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CEO Pay Ratio

In 2023 the Company updated its comparison of CEO pay to the pay of its employees, consistent with SEC rules. As of December 31, 2023, the Company determined that the total number of employees was 3,137. When identifying the median employee in 2023, the Company chose target total cash compensation as the consistently applied compensation measure. To make this calculation, the Company annualized pay for those employees who commenced work during 2023, through recruitment and acquisition, and any employee who was on unpaid leave for a portion of 2023. The Company used a statistically valid sampling methodology to identify a population of employees whose target total cash compensation was within a 2% range of the median. From this sample, the Company identified the median employee.

Total compensation for 2023 for our CEO was $5,779,845, and the median employee’s total compensation was $70,214. Therefore, as further described in the table below, the Company’s 2023 ratio of CEO pay to median worker pay is 82:1.

​

​

​

​

​

​

​

​

​

​

    

Median

Compensation Element

  

CEO ($)

​

Employee ($)

Annual Salary

​

$

1,050,000

​

$

65,064

Overtime (OT), Double Time (DT), and Shift Differential (SD)

​

​

—

​

$

83

Salary (including OT, DT and SD)

​

$

1,050,000

​

$

65,147

Bonus

​

 

—

​

$

606

Fair Value of Stock Awards

​

$

2,804,972

​

 

—

Fair Value of Option Awards

​

$

1,322,998

​

 

—

Non-equity Incentive Plan Compensation

​

$

449,768

​

$

1,859

Change in Pension Value

​

$

13,387

​

 

—

All Other Compensation

​

$

138,719

​

$

2,603

Summary Compensation Table Totals

​

$

5,779,845

​

$

70,214

2023 CEO Pay Ratio

​

82:1

​

SEC rules for identifying the median employee allow companies to adopt a variety of methodologies, and to use reasonable estimates and assumptions that reflect their compensation practices. As such, pay ratios reported by other companies may not be comparable to the Company’s pay ratio reported above.

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DIRECTOR COMPENSATION

Table of Contents

CEO PAY RATIO

Director Compensation

For 2016,each of our Company’snon-employee directors, our 2023 director compensation program provided each memberconsisted of our Board who is not an employee of the Company or one of our subsidiaries an annual cash retainer payment of $90,000. Under this program eachnon-employee director was also eligible to receive$90,000, and an annual equity retainer of restricted stock units with a grant date fair value of $90,000,$130,000, which vest on theone-year anniversary of their grant date. Our director compensation program for 2016 also providedAdditionally, the Board’s non-employee chair received an additional annual cash retainer payments for the chairpersonsof $130,000. The non-employee chairs of the audit committee, and compensation committee, nominating and corporate governance committee and EHSS&PP committee received additional annual cash retainers of $25,000, $20,000, $15,000 and $15,000, respectively.

Our directors are subject to the Company’s share ownership guidelines, which stipulate that each director must hold five (5) times their annual cash retainer in Trinseo shares within five (5) years from the date of becoming a Board member (the “accumulation date”). As of December 31, 2023, five of our directors had served past the accumulation date:  Mr. Alvarado, Mr. Cote, Mr. De Leener, Mr. Steinmetz and Ms. Johnson. Due exclusively to the decline in the Company’s stock price, these five directors were not in compliance with the share ownership guidelines. Failure to meet our share ownership guidelines due to decline in stock price is not deemed a breach if the director met the guidelines in a prior year. Until the ownership requirement is met, directors who are not in compliance must retain 50% of the shares issued after vesting and settlement of restricted stock units (net of all applicable taxes). None of our current directors sold any Trinseo shares during 2023.

The following table sets forth information concerning the compensation earned by our directors during fiscal 2016. Compensation for Mr. Pappas is included with that of our other named executive officers. Mr. Pappas did not receive any additional compensation for his service on our Board.2023.

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Fees Earned or 

    

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Paid in Cash 

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Stock Awards 

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Total

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($) (1)

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($) (2) (3)

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($)

Joseph Alvarado

​

110,000

​

130,000

​

240,000

Victoria Brifo

 

90,000

​

130,000

​

220,000

Jeffrey J. Cote

 

98,167

​

130,000

​

228,167

Pierre-Marie De Leener

 

90,000

​

130,000

​

220,000

Jeanmarie Desmond

 

90,000

​

130,000

​

220,000

Matthew Farrell

 

90,000

​

130,000

​

220,000

K’Lynne Johnson

 

220,000

​

130,000

​

350,000

Sandra Beach Lin

 

105,000

​

130,000

​

235,000

Philip R. Martens (4)

 

47,833

​

—

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47,833

Donald T. Misheff (4)

 

41,000

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—

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41,000

Henri Steinmetz

 

90,000

​

130,000

​

220,000

Mark Tomkins

 

115,000

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130,000

​

245,000

   

Fees Earned
or Paid in
Cash ($)(1)

 

   

Stock Awards
($)(2)(3)

 

   

Total ($)

 

 

 

Brian W. Chu

  

 

$

 

7,500

 

 

  

 

$

 

—

 

 

  

 

$

 

7,500

 

 

 

Jeffrey J. Cote

  

 

$

 

115,000

 

 

  

 

$

 

90,000

 

 

  

 

$

 

205,000

 

 

 

Pierre-Marie De Leener

  

 

$

 

90,000

 

 

  

 

$

 

90,000

 

 

  

 

$

 

180,000

 

 

 

Felix S. Hauser

  

 

$

 

47,069

 

 

  

 

$

 

90,000

 

 

  

 

$

 

137,069

 

 

 

Philip R. Martens

  

 

$

 

30,000

 

 

  

 

$

 

90,000

 

 

  

 

$

 

120,000

 

 

 

Donald T. Misheff

  

 

$

 

90,000

 

 

  

 

$

 

90,000

 

 

  

 

$

 

180,000

 

 

 

Michel G. Plantevin

  

 

$

 

90,000

 

 

  

 

$

 

90,000

 

 

  

 

$

 

180,000

 

 

 

Ruth Springham

  

 

$

 

30,000

 

 

  

 

$

 

—

 

 

  

 

$

 

30,000

 

 

 

Stephen F. Thomas

  

 

$

 

90,000

 

 

  

 

$

 

90,000

 

 

  

 

$

 

180,000

 

 

 

Aurélien Vasseur

  

 

$

 

60,000

 

 

  

 

$

 

—

 

 

  

 

$

 

60,000

 

 

 

Stephen M. Zide

  

 

$

 

105,000

 

 

  

 

$

 

90,000

 

 

  

 

$

 

195,000

 

 

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(1)Consists of annual retainer amounts, which are paid quarterly and prorated based on the director’s service dates. Mr. Chu resigned from our Board effective February 1, 2016 and was replaced by Mr. Hauser, effective February 22, 2016. Messrs. Hauser and Vasseur resigned from our Board effective September 1, 2016 and were replaced by Mr. Martens and Ms. Springham.date of appointment as a director, or as committee or board chair.

(2)The amounts reported represent the grant date fair value of restricted stock units granted in 20162023 calculated in accordance with ASC 718. The assumptions used for determining fair value are described in Note 1723 to our consolidated financial statements filed with our Annual Report on Form10-K.

(3)As of December 31, 2016, Messrs. Cote, De Leener, Misheff, Plantevin, Thomas and Zide2023, each of our non-employee directors held 1,8979,041 shares of the Company pursuant to their unvested restricted stock unit awards which vest in June 2024.
(4)Mr. Martens and Mr. Martens held 1,585 sharesMisheff resigned from the Board in June 2023.

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Table of Contents

AUDIT COMMITTEE MATTERS

Audit Committee Matters

Audit Committee Report

We operate in accordance with a written charter adopted by the Board and reviewed annually by the audit committee, a copy of which is available on our website, investor.trinseo.com, under the “Governance—Committee Composition” section. We are responsible for overseeing the quality and integrity of Trinseo’s accounting, auditing and financial reporting practices. In accordance with the rules of the SEC and the NYSE, the audit committee is composed entirely of members who are independent, as defined by the listing standards of the NYSE. Further, the Board has determined that Ms. Desmond and Messrs. Cote, Farrell and Tomkins are each audit committee financial experts as defined by the rules of the SEC.

The audit committee met nine times during fiscal 2023 with Trinseo’s management and PricewaterhouseCoopers LLP (“PwC”), Trinseo’s independent registered public accounting firm, including, but not limited to, meetings held to review and discuss the annual audited and quarterly financial statements and the Company’s earnings press releases.

We believe that we fully discharged our oversight responsibilities as described in our audit charter, including with respect to the audit process. We received the written disclosures and the letter from PwC pursuant to Rule 3526, Communication with Audit Committees Concerning Independence, of the Public Company Accounting Oversight Board (“PCAOB”) concerning any relationships between PwC and Trinseo and the potential effects of any disclosed relationships on PwC’s independence and discussed with PwC its independence. We discussed with management, the internal auditors and PwC, Trinseo’s matters including internal control over financial reporting and the internal audit function’s organization, responsibilities, budget and staffing. We reviewed with both PwC and our internal auditors their audit plans, audit scope, identification of audit risks and the results of their audit efforts.

We discussed and reviewed with PwC the matters required to be discussed by Auditing Standard No. 1301, “Communications with Audit Committees,” as adopted by the PCAOB and, with and without management present, discussed and reviewed the results of PwC’s examination of Trinseo’s financial statements. We also discussed the results of the internal audit examinations with and without management present.

Audit and Other Fees

The following table shows the fees for professional services rendered by PwC for the year ended December 31, 2023 (fiscal 2023) and the year ended December 31, 2022 (fiscal 2022):

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2023

    

2022

Audit fees (1)

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$

7,075,000

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$

7,260,000

Audit-related fees (2)

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$

729,000

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$

7,143,000

Tax fees (3)

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$

476,000

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$

191,000

All other fees (4)

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$

1,000

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$

10,000

Total fees

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$

8,281,000

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$

14,604,000

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(1)Consists of the Company pursuantaudit of the Company’s financial statements and evaluation and reporting on the effectiveness of the Company’s internal controls over financial reporting, statutory audits, reviews of the Company’s quarterly financial statements, as well as services performed in conjunction with other SEC and regulatory filings. These fees include $368,000 and $292,000 paid to his unvested restricted stock unit award. AsPricewaterhouseCoopers for the audit of December 31, 2016, Messrs. Chu, Hauser,all statutory accounts required by Irish law during fiscal 2023 and Vasseurfiscal 2022, respectively.
(2)Primarily consists of services related to strategic initiatives, pre-implementation reviews of processes and Ms. Springham had no outstanding equity awards.systems, financial due diligence, pension plan audits, and various other agreed upon procedures.
(3)Consists of tax compliance, tax audit defense, as well as worldwide tax advisory and consulting services. The increase in fiscal 2023 tax fees is mainly due to an ongoing tax examination of our subsidiary in China.
(4)Consists of subscriptions to knowledge tools.

We pre-approve all audit services and all permitted non-audit services by PwC, including engagement fees and terms. Our policies prohibit the Company from engaging PwC to provide any services relating to bookkeeping or other services related to accounting records or financial statements, financial information system design and implementation, appraisal or valuation services, fairness opinions or contribution-in-kind reports, actuarial services, internal audit outsourcing, any management function, legal services or expert services not related to the audit, broker-dealer, investment adviser, or investment banking services or human resource consulting. In addition, we evaluate whether the Company’s use of PwC

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Table of Contents

AUDIT COMMITTEE MATTERS

for permitted non-audit services is compatible with maintaining PwC’s independence. We concluded that PwC’s provision of non-audit services, all of which we approved in advance, was compatible with its independence.

We reviewed the audited consolidated financial statements of Trinseo as of December 31, 2023 with management and PwC. Management has the responsibility for the preparation of Trinseo’s financial statements, and PwC has the responsibility for the audit of those statements.

Based on these reviews and discussions with management and PwC, we recommended to the Board that Trinseo’s audited financial statements be included in its Annual Report on Form 10-K for fiscal 2023 for filing with the SEC. We have reviewed and evaluated the performance of PwC, and as a result have selected PwC as the independent registered public accounting firm for the year ended December 31, 2024, subject to ratification by Trinseo’s shareholders, and our authority to set auditor remuneration will be subject to approval by Trinseo’s shareholders. We have also evaluated and selected PricewaterhouseCoopers as the independent auditor for all of Trinseo’s statutory accounts required under Irish law for the year ended December 31, 2024.

Audit Committee

Mark Tomkins, Chair

Jeffrey J. Cote

Jeanmarie Desmond

Matthew Farrell

Henri Steinmetz

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Table of Contents

PROPOSAL 3

Proposal 3—Ratification of Appointment of the Independent Registered Public Accounting Firm and Authorization of the Board to Set Auditors’ Remuneration

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The Audit Committee of our Board has retained PwC to be our independent registered public accounting firm for the year ending December 31, 2024. The Audit Committee has further recommended that such appointment be submitted for ratification by our shareholders at the Annual Meeting.

We are also asking our shareholders to authorize the audit committee of the Board to determine the remuneration of our independent registered public accounting firm and the Company’s statutory auditor.

Therefore, we are seeking (i) ratification of the appointment of PwC as our independent registered public accounting firm, in a non-binding advisory vote, and (ii) authorization, in a binding vote, of the authority of the audit committee of the Board to determine the remuneration of our independent registered public accounting firm and the Company’s statutory auditor, from our shareholders at the Annual Meeting.

Representatives of PwC along with representatives of PricewaterhouseCoopers, our Irish statutory auditor, will be available at the Annual Meeting, will be given the opportunity to make a statement, if they so desire, and will be available to respond to appropriate questions from you.

THE TEXT OF THE RESOLUTION IN RESPECT OF THIS PROPOSAL IS AS FOLLOWS:

“RESOLVED, that (i) the appointment of PricewaterhouseCoopers LLP as our independent registered public accounting firm for the year ending December 31, 2024 be approved and (ii) the audit committee of the board of directors is authorized to determine the remuneration of our independent registered public accounting firm and the statutory auditor.”

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THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE “FOR”
THE APPOINTMENT OF PWC AS ITS INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM,
AND ON A BINDING BASIS, THE AUTHORIZATION OF THE BOARD’S AUDIT COMMITTEE
TO FIX THE AUDITORS’ REMUNERATION.

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Table of Contents

PROPOSAL 4

Proposal 4—Board Authority to Issue Shares under Irish Law

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Under Irish law, directors of an Irish public limited company must have authority from its shareholders to issue any shares, including shares that are part of the Company’s authorized but unissued share capital.

We are presenting this proposal to renew the Board’s authority to issue our authorized but unissued shares, which approval is conditional on shareholder approval of Proposal 5. It has been customary practice in Ireland to seek shareholder authority to issue up to 33% of a company’s issued ordinary share capital, and for such authority to be limited to a period of up to 18 months. However, in line with evolving stakeholder expectations, we are seeking approval at the 2024 Annual General Meeting to authorize the Board to issue up to a maximum of 20% of our issued ordinary share capital as of March 31, 2024, for a period expiring 18 months from the passing of this resolution, unless otherwise varied, revoked or renewed. Notwithstanding the foregoing, we expect to propose renewal of this authorization on a regular basis at our annual general meetings in future years.

Granting the Board this authority is a routine matter for public companies incorporated in Ireland and is consistent with Irish market practice. This authority is fundamental to our business and enables us to issue shares, including, if applicable, in connection with funding acquisitions and raising capital. We are not asking you to approve an increase in our authorized share capital or to approve a specific issuance of shares. Instead, approval of this proposal will only grant the Board the authority to issue shares that are already authorized under our Constitution upon the terms below. In addition, we note that, because we are a NYSE-listed company, our

shareholders continue to benefit from the protections afforded to them under the rules and regulations of the NYSE and SEC, including those rules that limit our ability to issue shares in specified circumstances.

As required under Irish law, the resolution in respect of this proposal is an ordinary resolution that requires the affirmative vote of a simple majority of the votes cast.

THE TEXT OF THE RESOLUTION IN RESPECT OF THIS PROPOSAL IS AS FOLLOWS:

“RESOLVED, that subject to and conditional on the passing of the resolution in respect of Proposal No. 5, and in substitution for all existing such authorities, the directors be and are hereby generally and unconditionally authorized with effect from the passing of this resolution to exercise all powers of the Company to allot relevant securities (within the meaning of section 1021 of the Companies Act 2014) up to an aggregate nominal amount of $70,587.51 (7,058,751 shares) (being equivalent to approximately 20% of the aggregate nominal value of the issued ordinary share capital of the Company as of March 31, 2024 (the latest practicable date before this proxy statement)), and the authority conferred by this resolution shall expire 18 months from the passing of this resolution, unless previously renewed, varied or revoked; provided that the Company may make an offer or agreement before the expiry of this authority, which would or might require any such securities to be allotted after this authority has expired, and in that case, the directors may allot relevant securities in pursuance of any such offer or agreement as if the authority conferred hereby had not expired.”

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THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE “FOR”
THE BOARD AUTHORITY TO ISSUE SHARES.

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PROPOSAL 5

Proposal 5—Board Authority to Opt Out of Statutory Pre-Emption Rights under Irish Law

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Under Irish law, unless otherwise authorized, when an Irish public limited company issues shares for cash to new shareholders, it is required first to offer those shares on the same or more favorable terms to its existing shareholders of the company on a pro-rata basis (commonly referred to as the statutory pre-emption right).

We are presenting this proposal to request shareholder approval of waiver of their statutory pre-emption rights in connection with a share issuance authorized in Proposal 4. We understand that it is customary practice for listed companies in Ireland to seek shareholder authority to waive (or “opt out of”) their statutory pre-emption rights in the event of (i) the issuance of shares for cash in connection with any rights issue; and (ii) the issuance of shares for cash, if the issuance is limited to up to 5% of a company’s issued ordinary share capital (with the possibility of issuing an additional 5% of the company’s issued ordinary share capital provided the company uses it only in connection with an acquisition or specified capital investment which is announced contemporaneously with the issuance, or which has taken place in the preceding six-month period and is disclosed in the announcement of the issue) bringing the total acceptable limit to 10% of the company’s issued ordinary share capital.

It is also customary practice for such waiver (or opt-out) to be limited to a period of 12 to 18 months. Therefore, in accordance with customary practice for listed companies in Ireland, we are seeking this authority for a period expiring 18 months from the passing of this resolution, unless otherwise varied, renewed or revoked.

Similar to the authorization sought for Proposal 4, granting the Board this authority is a routine matter for public companies incorporated in Ireland and is consistent with Irish market practice. This authority is fundamental to our business and, if applicable, will facilitate our ability to fund acquisitions and otherwise raise capital. We are not asking you to approve an increase in our authorized share capital. Instead, approval of this proposal will only grant the Board the authority to issue shares that are already authorized under our Constitution upon the terms below. This proposal is also conditioned on shareholder approval of Proposal 4.

Without any such authorization, in each case when we issue shares for cash, we would first have to offer those shares on the same or more favorable terms to all of our existing shareholders. This requirement could cause delays in the completion of acquisitions and capital raising for our business. Renewal of this authority would not exempt the Company from applicable NYSE requirements to obtain shareholder approval prior to

certain share issuances, generally at or greater than 20%.

As required under Irish law, the resolution is a special resolution that requires the affirmative vote of at least 75% of the votes cast.

THE TEXT OF THE RESOLUTION IN RESPECT OF THIS PROPOSAL IS AS FOLLOWS:

“RESOLVED, that, as a special resolution, subject to the passing of the resolution in respect of Proposal No. 4 as set out above, in substitution for all such existing powers, and with effect from the passing of this resolution, the directors be and are hereby empowered pursuant to section 1023 of the Companies Act 2014 to allot equity securities (as defined in section 1023 of that Act) for cash, pursuant to the authority conferred by Proposal No. 4 as if sub-section (1) of section 1022 of that Act did not apply to any such allotment, provided that this power shall be limited to: (a) the allotment of equity securities in connection with a rights issue in favor of the holders of ordinary shares (including rights to subscribe for, or convert into, ordinary shares) where the equity securities respectively attributable to the interests of such holders are proportional (as nearly as may be) to the respective numbers of ordinary shares held by them (but subject to such exclusions or other arrangements as the directors may deem necessary or expedient to deal with fractional entitlements that would otherwise arise, or with legal or practical problems under the laws of, or the requirements of any recognized regulatory body or any stock exchange in, any territory, or otherwise); and (b) the allotment (otherwise than pursuant to sub-paragraph (a) above) of equity securities up to an aggregate nominal value of $35,293 (3,529,375 shares) (being equivalent to approximately 10% of the aggregate nominal value of the issued ordinary share capital of the Company as of March 31, 2024 (the latest practicable date before this Proxy Statement)) provided that, with respect to 1,764.687 of such shares, (being equivalent to approximately 5% of the issued ordinary share capital), such allotment is to be used for the purposes of an acquisition or a specified capital investment; and in each case, the authority conferred by this resolution shall expire eighteen (18) months from the passing of this resolution, unless previously renewed, varied or revoked; provided that the Company may make an offer or agreement before the expiry of this authority, which would or might require any such securities to be allotted after this authority has expired, and in that case, the directors may allot equity securities in pursuance of any such offer or agreement as if the authority conferred hereby had not expired.”

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THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE “FOR”
THE BOARD AUTHORITY TO OPT OUT OF PREEMPTION RIGHTS.

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Table of Contents

PROPOSAL 6

Proposal 6—Authorize Price Range for Re-Issuing Treasury Shares

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Our treasury account contains ordinary shares that we previously acquired from our shareholders, and when we issue ordinary shares to satisfy our obligations under our equity compensation plan or for other purposes, we may re-issue shares from our treasury account instead of issuing new ordinary shares from our authorized share capital. Under Irish law, we need our shareholders to set the minimum and maximum prices at which we are authorized to re-issue treasury shares off-market. Once set by our shareholders, the price range is valid for no more than 18 months. Unless the price range is set by our shareholders, we cannot re-issue treasury shares. If approved, we intend to use our treasury shares primarily to satisfy obligations under equity awards granted to our employees and directors under our Equity Plan, and it is possible we may also reissue treasury shares for other corporate purposes that may arise.

THE FORMAL TEXT OF THE RESOLUTION THAT WE ARE ASKING OUR SHAREHOLDERS TO APPROVE IS AS FOLLOWS:

“RESOLVED that, as a special resolution for the purposes of section 1078 of the Companies Act 2014 of Ireland (the “Companies Act”), the maximum and minimum prices at which ordinary shares that we previously acquired and hold in treasury may be reissued off-market are as follows:

(i)the maximum price at which such treasury shares may be re-allotted off-market is an amount equal to 120% of the market price per ordinary share on the New York Stock Exchange or any other securities exchange
where the Company’s shares are then traded, and

(ii)the minimum price at which such treasury shares may be re-allotted shall be the nominal value of the share where such a share is required to satisfy an obligation under any compensation plan (including any share or option scheme) operated by Trinseo PLC or, in all other cases, not less than 95% of the market price per ordinary share on the New York Stock Exchange or any other securities exchange where the Company’s shares are then traded.

The authority conferred by this resolution is effective from the date of passing of this resolution and expires eighteen months from the date of the passing of this resolution, unless previously varied, revoked or renewed by special resolution in accordance with the provisions of section 1078 of the Companies Act.

For the purpose of this resolution, the “market price” of our ordinary shares is the average of the closing price on each of the consecutive days of trading during a period no shorter than one trading day and no longer than 10 trading days immediately preceding the date of the issuance, as reasonably determined by the Board of the Company.”

As required under Irish law, the resolution is a special resolution that requires the affirmative vote of at least 75% of the votes cast.

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THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE “FOR” THE PRICE RANGE FOR ISSUING TREASURY SHARES.

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SHAREHOLDER PROPOSALS AND& DIRECTOR NOMINATIONS

Shareholder Proposals and& Director Nominations

A shareholder who intends to nominate a director or present a proposal at the 20182024 annual general meeting of shareholders and who wishes the nomination or proposal to be included in the proxy materials for that meeting pursuant toRule 14a-8 under the Securities Exchange Act of 1934, as amended, must submit the proposal in writing to us so that it is received by our Corporate Secretary no later than January 10, 2018.1, 2025. In addition, one or more shareholders representingorder for a shareholder proposal submitted outside of Rule 14a-8 to be considered at least ten percent (10%) of our ordinary shares outstanding may submit written proposals to the Company for inclusion on the agenda for the 20182025 annual general meeting of shareholders, if such written proposals areproposal must be received by the Company at least 21its registered office not more than 120 days before(i.e., January 1, 2025) and not less than 90 days (i.e., January 31, 2025) prior to the first anniversary of the date this proxy statement was first released to shareholders. However, if the date of our 20182025 annual general meeting is changed by more than 30 days from the date of shareholders. 2024 annual general meeting, notice by the shareholder to be timely must be so delivered not earlier than the 120th day prior to the 2025 annual general meeting and not later than the later of the 90th day prior to the 2025 annual general meeting, or the 10th day following the day on which public announcement of the date of the 2025 annual general meeting is first made.

Written proposals may be mailed to us at Trinseo S.A., 1000 Chesterbrook Boulevard, Suite 300, Berwyn, Pennsylvania 19312 Attn:PLC (Attn: Corporate Secretary. ASecretary) at our registered office, Riverside One, Sir John Rogerson’s Quay, Dublin 2, Dublin, Ireland, D02 X576.

Each submission relating to the nomination of persons to be elected to the Board, or other business proposed to be brought up before the meeting must meet the form, deadline and other requirements in Article 101 of our Constitution, including the applicable notice, information and consent provisions. Board nominations must:

●set forth the name, age, business address and residence address of each individual whom the shareholder proposes to nominate for election or re-election as a director;
●set forth set forth the class and number of our shares which are owned of record and beneficially by such nominee;
●set forth the date or dates on which such shares were acquired and the investment intent of such acquisition;
●include a completed and signed questionnaire, representation and agreement required by Article 101.1(f) of our Articles of Association;
●include the information required by Article 101.3 of our Articles of Association.

In addition to the requirements as to form and substance established by the SEC, shareholder who intends to nominateproposals must be a director or present any other proposal at the 2018 annual general meeting of shareholders but does not wish the proposalproper subject for shareholder action under Irish law and our Constitution to be included in theour proxy materials for that meeting must provide written notice of the nomination or proposal to us no earlier than 120 days and no later than 90 days before our 2018 annual general meeting of shareholders.materials. We reserve the right to reject, rule out of order, or take other appropriate action with respect to any proposal that does not comply with these and other applicable requirements. Our Articles of Association describeConstitution describes in full the requirements for submitting proposals at the annual general meeting. The notice must be given in the manner and must include the information and representations required by our ArticlesConstitution.

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Table of Association.Contents

HOUSEHOLDING

Available Information

Householding

Certain informationSEC rules permit a single set of annual reports and proxy statements to be sent to any household at which two or more shareholders reside if they appear to be members of the same family. Each shareholder continues to receive a separate proxy card. This procedure is referred to as householding. While the Company does not household in thismailings to its shareholders of record, a number of brokerage firms with account holders who are Company shareholders have instituted householding. In these cases, a single proxy statement references sections of our 2016 Annual Report onForm 10-K filed with the U.S. Securities Exchange Commission on March 1, 2017. The Company will provide, without charge, to each shareholder to whom a proxy statement is delivered, a copy off such information that is incorporated by reference, upon written or oral request. Requestsand annual report will be respondeddelivered to within one business day of receipt and materials will be sent via first class mail or another equally prompt means. Requests should be directed to: Attn: Investor Relations, 1000 Chesterbrook Blvd., Suite 300, Berwyn, Pennsylvania 19312 or (610) 240-3307.

2017 Proxy StatementLOGO43

TRINSEO S.A.

1000 CHESTERBROOK BLVD.

SUITE 3000

BERWYN, PA 19312

VOTE BY INTERNET - www.proxyvote.com

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DETACH AND RETURN THIS PORTION ONLY

THIS PROXY CARD IS VALID ONLY WHEN SIGNED AND DATED.
The Board of Directors recommends you vote FORthe following:
1.

To elect one Class III director, Mr. Henri

Steinmetz, to serve for a term until the 2020

annual general meeting of shareholders.

ForAgainstAbstain
Nominees
1AHenri Steinmetz☐☐☐
NOTE:Such other business as may properly come before the meeting or any adjournment thereof.

Please sign exactly as your name(s) appear(s) hereon. When signing as attorney, executor, administrator, or other fiduciary, please give full title as such. Joint owners should each sign personally. All holders must sign. If a corporation or partnership, please sign in full corporate or partnership name, by authorized officer.

Signature [PLEASE SIGN WITHIN BOX]DateSignature (Joint Owners)Date

0000346557_1 R1.0.1.17

Important Notice Regardingmultiple shareholders sharing an address unless contrary instructions have been received from the Availability of Proxy Materials for the Special Meeting:The Notice & Proxy Statement is/are available atwww.proxyvote.com.

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TRINSEO S.A.

Extraordinary General Meeting of Shareholders

November 28, 2017 5:20 p.m. CEST

This proxy is solicited by the Board of Directors

The shareholder(s) hereby appoint(s) Christopher D. Pappas, Angelo N. Chaclas, and Suzanne Kersten, or any of them, as proxies, each with the power to appointaffected shareholders. Once a shareholder has received notice from his or her substitute,broker that the broker will be householding communications to the shareholder’s address, householding will continue until the shareholder is notified otherwise or until the shareholder revokes his or her consent. If at any time a shareholder no longer wishes to participate in householding and hereby authorize(s) themwould prefer to representreceive a separate proxy statement and to vote, as designatedannual report, he or she should notify his or her broker. Any shareholder can receive a copy of the Company’s proxy statement and annual report by contacting the Company at its registered office at Riverside One, Sir John Rogerson’s Quay, Dublin 2, Dublin, Ireland, D02 X576, Attention: Secretary or by accessing it on the reverse side of this ballot, allCompany’s website at www.trinseo.com.

Shareholders who hold their shares through a broker or other nominee who currently receive multiple copies of the ordinary sharesproxy statement and annual report at their address and would like to request householding of TRINSEO S.A. that the shareholder(s) is/are entitled to vote at the Extraordinary General Meetingtheir communications should contact their broker.

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2024 Proxy StatementGraphic

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Table of Shareholders to be held at 5:20 p.m. CEST, on November 28, 2017, at 4 rue du Fort Niedergrünewald, BP 512/Quartier Européen Nord, L-2015 Luxembourg, Grand DuchyContents

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Table of Luxembourg, and any adjournment or postponement thereof.Contents

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This proxy, when properly executed, will be voted in the manner directed herein. If no such direction is made, this proxy will be voted in accordance with the Board of Directors’ recommendations.​

Continued and to be signed on reverse side​

0000346557_2 R1.0.1.17​

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