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

(Amendment No.     )

Filed by the Registrant  ☒                             Filed by a Party other than the Registrant  ☐

Check the appropriate box:

Nektar Therapeutics

(Name of Registrant as Specified In Its Charter)

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

Payment of Filing Fee (Check the appropriate box):

NEKTAR THERAPEUTICS

455 Mission Bay Boulevard South

San Francisco, California 94158

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

TO BE HELD ON JUNE 17, 2020

AT 2:00 P.M. PACIFIC TIME

Dear Stockholder:

You are cordially invited to attend the 2020 Annual Meeting of Stockholders of Nektar Therapeutics, a Delaware corporation which will be held by live webcast only. The 2020 Annual Meeting will be held on Wednesday, June 17, 2020, at 2:00 p.m. solely by webcast for the following purposes:

These items of business are more fully described in the Proxy Statement accompanying this Notice of Annual Meeting of Stockholders. The record date for the 2020 Annual Meeting is April 20, 2020. Only stockholders of record at the close of business on that date are entitled to notice of, and to vote at, the 2020 Annual Meeting or any adjournment thereof.

Due to the public health and travel concerns our stockholders may have related to the coronavirus(COVID-19) and the protocols that federal, state, and local governments may impose, we have elected to hold the Annual Meeting of Stockholders solely by means of remote communication. The webcast of the Annual Meeting will begin promptly at 2:00 p.m. Pacific Time.

To participate in the live webcast, please visit www.virtualshareholdermeeting.com/NKTR2020. You will need the control number included on your Notice, proxy card, or voting instruction form. We encourage you to access the meeting prior to the start time.

Your vote is very important. Whether or not you participate in the 2020 Annual Meeting which will be held by live webcast on the day of the meeting, it is important that your shares be represented. You may vote your proxy on the Internet, by phone or by mail in accordance with the instructions in the Notice of Availability of Proxy Materials.

On behalf of the Board of Directors, thank you for your participation in this important annual process.

By Order of the Board of Directors

/s/ Mark A. Wilson

Mark A. Wilson

Senior Vice President, General Counsel and Secretary

San Francisco, California

April 29, 2020

YOU ARE CORDIALLY INVITED TO ATTEND THE ANNUAL MEETING IN VIA LIVE WEBCAST ON THE DAY OF THE MEETING. WHETHER OR NOT YOU EXPECT TO ATTEND THE ANNUAL MEETING, PLEASE VOTE ON THE INTERNET, BY PHONE OR BY MAIL AS INSTRUCTED IN THE NOTICE OF AVAILABILITY OF PROXY MATERIALS, AS PROMPTLY AS POSSIBLE IN ORDER TO ENSURE YOUR REPRESENTATION AT THE MEETING. EVEN IF YOU HAVE VOTED BY PROXY, YOU MAY STILL VOTE DURING THE LIVE WEBCAST IF YOU ATTEND THE ANNUAL MEETING. PLEASE NOTE, HOWEVER, THAT IF YOUR SHARES ARE HELD OF RECORD BY A BROKER, BANK OR OTHER NOMINEE AND YOU WISH TO VOTE AT THE ANNUAL MEETING, YOU MUST OBTAIN A PROXY ISSUED IN YOUR NAME FROM THAT RECORD HOLDER.

TABLE OF CONTENTS

NEKTAR THERAPEUTICS

455 Mission Bay Boulevard South

San Francisco, California 94158

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

TO BE HELD ON JUNE 10, 2021

AT 2:00 P.M. PACIFIC TIME

QUESTIONS AND ANSWERS ABOUT THESE PROXY MATERIALS AND VOTING PROCEDURES

Due to the public health and travel concerns our stockholders may have related to the coronavirus(COVID-19) and the protocols that federal, state, and local governments may impose, we have elected to hold the Annual Meeting of Stockholders solely by means of remote communication.

WHYAM IRECEIVINGTHESEMATERIALS?

We sent you a Notice of Availability of Proxy Materials (the “Notice”) because the board of directors of Nektar Therapeutics, a Delaware corporation (“Nektar,” the “Company,” “we” or “us”), is soliciting your proxy to vote at our 20202021 annual meeting of stockholders (the “Annual Meeting”) to be held solely by live webcast on June 17, 202010, 2021 at 2:00 p.m. There will be noin-person meeting. We invite you to attend the Annual Meeting by live webcast to vote on the proposals described in this proxy statement. However, you do not need to attend the live webcast meeting to vote your shares. Instead, you may vote by proxy over the Internet or by phone by following the instructions provided in the Notice or, if you request printed copies of the proxy materials by mail, you may vote by mail. Please visit our website at www.nektar.com for updated information related to the Annual Meeting. As always, we encourage you to vote your shares prior to the Annual Meeting.

The webcast of the Annual Meeting will begin promptly at 2:00 p.m. Pacific Time. To participate in the live webcast,please visit www.virtualshareholdermeeting.com/NKTR2020.NKTR2021. You will need the control number included on your Notice, proxy card, or voting instruction form. We encourage you to access the meeting prior to the start time.

The Notice was first sent or made available on or about April 29, 202030, 2021 to all stockholders of record entitled to vote at the Annual Meeting.

WHOCANVOTEATTHEANNUALMEETING?

Only stockholders of record at the close of business on April 20, 202012, 2021 will be entitled to vote at the Annual Meeting. On this record date, there were 177,914,327182,296,922 shares of common stock outstanding and entitled to vote.

Stockholder of Record: Shares Registered in Your Name

If, on April 20, 2020,12, 2021, your shares were registered directly in your name with our transfer agent, Computershare Inc., then you are a stockholder of record. The Notice will be sent to you by mail directly by us. As a stockholder of record, you may vote remotely at the Annual Meeting or vote by proxy. Whether or not you plan to attend the Annual Meeting remotely, we urge you to vote on the Internet or by phone as instructed in the Notice or by proxy by mail by requesting a paper copy of the proxy materials as instructed in the Notice to ensure your vote is counted.

Beneficial Owner: Shares Registered in the Name of a Broker, Bank or Other Agent

If, on April 20, 2020,12, 2021, your shares were held in an account at a brokerage firm, bank or other agent, then you are the beneficial owner of shares held in “street name” and the Notice is being forwarded to you by that organization. The organization holding your account is considered the stockholder of record for purposes of voting at the Annual Meeting. As a beneficial owner, you have the right to direct your broker, bank or other agent on how to vote the shares in your account. Your brokerage firm, bank or other agent will not be able to vote in the election of directors unless they have your voting instructions, so it is very important that you indicate your voting instructions to the institution holding your shares.

You are also invited to attend the Annual Meeting by live webcast. However, since you are not the stockholder of record, you may not vote your shares remotely at the Annual Meeting by live webcast unless you request and obtain a valid proxy from your broker, bank or other agent.

WHATAM IVOTINGON?

There are fivefour matters scheduled for a vote:

HOWAREPROXYMATERIALSDISTRIBUTED?

Under rules adopted by the Securities and Exchange Commission (“SEC”), we are sending the Notice to our stockholders of record and beneficial owners as of April 20, 2020.12, 2021. Stockholders will have the ability to access the proxy materials, including this proxy statement and our Annual Report on Form10-K for the fiscal year ended December 31, 2019,2020, on the Internet atwww.nektar.com or to request a printed or electronic set of the proxy materials at no charge. Instructions on how to access the proxy materials over the Internet and how to request a printed copy may be found on the Notice.

In addition, any stockholder may request to receive proxy materials in printed form by mail or electronically by email on an ongoing basis. Choosing to receive future proxy materials by email will save us the cost of printing and mailing documents to stockholders and will reduce the impact of annual meetings on the environment. A stockholder who chooses to receive future proxy materials by email will receive an email prior to next year’s annual meeting with instructions containing a link to those materials and a link to the proxy voting website. A stockholder’s election to receive proxy materials by email will remain in effect until the stockholder terminates it.

if you request printed copies of the proxy materials by mail, you may vote by mail. If your proxy is properly executed in time to be voted at the Annual Meeting, the shares represented by the proxy will be voted in accordance with the instructions you provide. Whether or not you plan to attend the Annual Meeting, we urge you to vote by proxy to ensure your vote is counted. You may still attend the Annual Meeting and vote remotely if you have already voted by proxy.

Beneficial Owner: Shares Registered in the Name of a Broker, Bank or Other Agent

If you are a beneficial owner of shares registered in the name of your broker, bank or other agent, you should have received a Notice and voting instructions from that organization rather than from us. Simply follow the instructions to ensure that your vote is counted. To vote by live webcast at the Annual Meeting, you must obtain a valid proxy from your broker, bank or other agent. Follow the instructions from your broker, bank or other agent included with the Notice, or contact your broker, bank or other agent.

We provide Internet proxy voting to allow you to vote your shares online, with procedures designed to ensure the authenticity and correctness of your proxy vote instructions. However, please be aware that you must bear any costs associated with your Internet access, such as usage charges from Internet access providers and telephone companies.

HOWMANYVOTESDO IHAVE?

On each matter to be voted upon, you have one vote for each share of common stock you owned as of April 20, 2020.12, 2021.

WHATIF IRETURNAPROXYCARDBUTDONOTMAKESPECIFICCHOICES?

If you are a stockholder of record and you return a proxy card without marking any voting selections, your shares will be voted:

If any other matter is properly presented at the meeting, your proxy (one of the individuals named on your proxy card) will vote your shares using his best judgment.

If you are a beneficial owner of shares registered in the name of your broker, bank or other agent, your shares are held by your broker, bank or other agent as your nominee (that is, in “street name”) and you will need to obtain a proxy form from the organization that holds your shares and follow the instructions included on that form regarding how to instruct the organization to vote your shares. If you do not give instructions to your broker, bank or other agent, it can vote your shares with respect to “discretionary” items but not with respect to“non-discretionary” items. Discretionary items are proposals considered routine under the rules of various national securities exchanges, and, in the absence of your voting instructions, your broker, bank or other agent may vote your shares held in street name on such proposals.Non-discretionary items are proposals considerednon-routine under the rules of various national securities exchanges, and, in the absence of your voting instructions, your broker, bank or other agent may not vote your shares held in street name on such proposals and the shares will be treated as brokernon-votes. Proposals 1, 2, 3 and 54 are matters considerednon-routine under the applicable rules. If you do not give your broker specific instructions, the broker will not vote your shares on Proposals 1, 2, 3, and 54 and your shares will constitute brokernon-votes which will be counted for purposes of determining whether a quorum exists but will not affect the outcome of these proposals. Proposal 4 involves a matter we believe to be routine and thus if you do not give instructions to your broker, the broker may vote your shares in its discretion on Proposal 43 and therefore no brokernon-votes are expected to exist in connection with Proposal 4.3.

For purposes of all proposals above, votes cast shall include any shares voted “Against” and shall exclude abstentions and, to the extent applicable, brokernon-votes.

WHOISPAYINGFORTHISPROXYSOLICITATION?

We will pay for the entire cost of soliciting proxies. In addition to the Notice and the proxy materials, our directors and employees may also solicit proxies during the live webcast, by telephone or by other means of communication. We have retained Georgeson LLC to assist in the distribution of proxy materials and the solicitation of proxies from brokerage firms, fiduciaries, custodians, and other similar organizations representing beneficial owners of shares for the Annual Meeting. We have agreed to pay Georgeson a fee of approximately $14,795 plus customary costs and expenses for these services. We will not pay our directors and employees any additional compensation for soliciting proxies. We may also reimburse brokerage firms, banks and other agents for the cost of forwarding the Notice and any other proxy materials to beneficial owners.

WHATDOESITMEANIF IRECEIVEMORETHANONENOTICE?

If you receive more than one Notice, your shares are registered in more than one name or are registered in different accounts. Please vote by proxy according to each Notice to ensure that all of your shares are voted.

submitted in writing by December 30, 2020,2021, to our Secretary, care of Nektar Therapeutics, 455 Mission Bay Boulevard South, San Francisco, California 94158. If we change the date of our 20212022 annual meeting by more than 30 days from the date of the previous year’s annual meeting, the deadline shall be a reasonable time before we begin to print and send our proxy materials. Stockholders interested in submitting such a proposal are advised to contact knowledgeable counsel with regard to the detailed requirements of the applicable securities laws and our bylaws. The submission of a stockholder proposal does not guarantee that it will be included in our proxy statement.

Alternatively, under our bylaws, if you wish to submit a proposal that is not to be included in next year’s proxy statement or nominate a director, you must provide specific information to us no earlier than March 19, 202112, 2022 and no later than the close of business on April 18, 2021.11, 2022. If we change the date of our 20212022 annual meeting by more than 30 days from the date of the previous year’s annual meeting, the deadline shall be changed to not later than the sixtieth day prior to such annual meeting and no earlier than the close of business on the ninetieth day prior to such annual meeting. The public announcement of an adjournment or postponement of the 20212022 annual meeting does not commence a new time period (or extend any time period) for the giving of a stockholder’s notice as described in this proxy statement. You are advised to review our bylaws, which contain additional requirements with respect to advance notice of stockholder proposals and director nominees.

A stockholder’s submission must include certain specific information concerning the proposal or nominee, as the case may be, and information as to the stockholder’s ownership of our common stock. Proposals or nominations not meeting these requirements will not be entertained at any annual meeting.

In relation to stockholder proposals and nominations, in certain instances we may exercise discretionary voting authority under proxies held by the board of directors. For instance, if we do not receive a stockholder proposal by April 18, 2021,11, 2022, we may exercise discretionary voting authority under proxies held by the board of directors on such stockholder proposal. If we change the date of our 20212022 annual meeting by more than 30 days from the date of the previous year’s annual meeting, the deadline will change to a reasonable time before we begin to print and send our proxy materials. In addition, even if we are notified of a stockholder proposal within the time requirements discussed above, if the stockholder does not comply with certain requirements of the Exchange Act, we may exercise discretionary voting authority under proxies held by the board of directors on such stockholder proposal if we include advice in our proxy statement on the nature of the matter and how we intend to exercise our discretion to vote on the matter.

PROPOSAL 1

ELECTION OF DIRECTORS

Our board of directors is presently comprised of eight (8)seven (7) directors and is divided into three (3) classes. Class IIII and Class II each currently consist of three directors and Class I currently consists of two directors, and each of Classes I and II currently consists of three directors.one director. Each class has a three (3) year term. The three (3) current directors in Class III are Howard W. Robin, Karin Eastham,Jeff Ajer, Robert B. Chess, and Myriam J. Curet, M.D.,Roy A. Whitfield, whose term expires in 2020.2021. Each of the current directors in Class III have been nominated for reelection at the Annual Meeting. Mr. Robin was previously elected byLutz Lingnau resigned from the stockholders. Ms. Eastham was appointed to our board of directors inon September 2018 and Dr. Curet was appointed to our board of directors in December 2019.    

30, 2020. Vacancies on the board, including vacancies created by an increase in the number of directors, are filled only by persons elected by a majority of the remaining directors. A director elected by the board to fill a vacancy in a class serves until the earliest of the end of the remaining term of that class, the election and qualification of his or her successor or such director’s death, resignation or removal.

Directors are elected by a majority of the votes cast at the Annual Meeting on the election of directors. A majority of votes cast shall mean that the number of shares voted “For” a director’s election exceeds fifty percent (50%) of the number of votes cast with respect to that director’s election, with votes cast including votes “Against” in each case but excluding abstentions and brokernon-votes with respect to that director’s election. Shares represented by executed proxies by stockholders of record will be voted for the election of the three nominees named below, unless the “Against” or “Abstain” voting selection has been marked on the proxy card. Neither abstentions nor brokernon-votes will have an effect on the outcome of the vote.

If any nominee becomes unavailable for election as a result of an unexpected occurrence, shares that would otherwise be voted for such nominee will be voted for the election of a substitute nominee proposed by the Nominating and Corporate Governance Committee and nominated by the board of directors. Each person nominated for election has agreed to serve if elected. Our management has no reason to believe that any nominee will be unable to serve. If elected at the Annual Meeting, each of the nominees will serve until the earliest of the 20232024 annual meeting of our stockholders, the election and qualification of his or her successor or his or her death, resignation or removal.

The following is a brief biography of each nominee.

Karin EasthamJeff Ajer

Karin EasthamJeff Ajer, age 70, 58,was appointed to serve as a member of our board of directors in September 2018. Ms. Eastham2017. Mr. Ajer currently serves onas Executive Vice President and Chief Commercial Officer at BioMarin Pharmaceutical Inc. (“BioMarin”), a global biotechnology company that develops and commercializes innovative therapies for people with serious and life-threatening rare disorders. From October 2012 to January 2014, Mr. Ajer served as Senior Vice President and Chief Commercial Officer of BioMarin. From April 2009 to October 2012, Mr. Ajer served as BioMarin’s Vice President, Commercial Operations, The Americas, where he had responsibility for commercial operations throughout the boards of directors of several life sciences companies. Ms. Eastham hasAmericas and led product marketing, reimbursement, and sales operations for BioMarin. Prior to joining BioMarin, Mr. Ajer served in various roles at Genzyme Corporation (“Genzyme”) beginning in November 2003, most recently as Vice President, Global Transplant Operations from December 2004 to August 2005. Mr. Ajer’s experience prior to Genzyme includes roles in sales, marketing and operations at SangStat Medical Corporation and ICN Pharmaceuticals. Mr. Ajer also served on the board of directors of Geron Corporation since March 2009, Veracyte, Inc. since December 2012,True North Therapeutics. Mr. Ajer received both a B.S. in chemistry and Personalis, Inc. since November 2019. Ms. Easthaman M.B.A. from the University of California, Irvine.

Robert B. Chess

Robert B. Chess, age 64, is the Chairman of our board of directors and has served as a director since May 1992. From March 2006 until January 2007, Mr. Chess served as our Acting President and Chief Executive

Officer, and from April 1999 to January 2007, served as Executive Chairman. He also served as our Co-Chief Executive Officer from August 1998 to April 2000, as President from December 1991 to August 1998, and as Chief Executive Officer from May 1992 to August 1998. Mr. Chess was previously the co-founder and President of Penederm, Inc., a publicly-traded dermatological pharmaceutical company that was sold to Mylan Laboratories. He has held management positions at Intel Corporation and Metaphor Computer Systems (now part of IBM), and was a member of the first President Bush’s White House staff as a White House Fellow and Associate Director of the White House Office of Economic and Domestic Policy. From 1997 until his retirement in 2009, Mr. Chess served on the board of directors of Ilumina Inc. from August 2004 to May 2019, MorphoSys AG from May 2012 to May 2017, Amylin Pharmaceuticals, Inc. from September 2005 until its acquisition in August 2012, Genoptix, Inc. from July 2008 until its acquisition in March 2011, Tercica, Inc. from December 2003 until its acquisition in October 2008, and Trius Therapeutics, Inc. from February 2007 until its acquisition in September 2013. From May 2004 to September 2008, Ms. Easthamthe Biotechnology Industry Organization (“BIO”). Mr. Chess served as Executive Vice PresidentChairman of BIO’s Emerging Companies Section and Chief Operating Officer,Co-Chairman of BIO’s Intellectual Property Committee. Mr. Chess was the initial Chairman of Bio Ventures for Global Health and as a member ofcontinues to serve on its board. He also serves on the Board of Trustees of the BurnhamCalifornia Institute for Medical Research (now Sanford Burnham Prebys Medical Discovery Institute),of Technology where he chairs the Technology Transfer Committee. Mr. Chess serves on the board of directors and is the lead director of Twist Biosciences, anon-profit corporation engaged publicly-traded company in biomedical research. From April 1999 to May 2004, Ms. Easthamthe synthetic biology field. He is currently a member of the faculty of the Stanford Graduate School of Business, where he teaches courses in the MBA program on the healthcare industry and the business opportunity created by aging demographics and increased longevity. Mr. Chess received his B.S. degree in Engineering with honors from the California Institute of Technology and an M.B.A. from Harvard University.

Roy A. Whitfield

Roy A. Whitfield, age 67, has served as Senior Vice President,our director since August 2000 and as Lead Independent Director since January 2019. Mr. Whitfield is the former Chairman of the Board and Chief FinancialExecutive Officer of Incyte Corporation (“Incyte”), a drug discovery and development company he co-founded in 1991. From January 1993 to November 2001, Mr. Whitfield served as its Chief Executive Officer and Secretaryfrom November 2001 until June 2003 as its Chairman. He also served as a director of DiversaIncyte from 1991 to January 2014. From 1984 to 1989, Mr. Whitfield held senior operating and business development positions with Technicon Instruments Corporation (“Technicon”), a medical instrumentation company, and its predecessor company, Cooper Biomedical, Inc., a biotechnology and medical diagnostics company. Ms. Eastham previously held similar positionsPrior to his work at Technicon, Mr. Whitfield spent seven years with CombiChem, Inc., a computational chemistry company, and Cytel Corporation, a biopharmaceutical company. Ms. Eastham also held several positions, including Vice President, Finance, at Boehringer Mannheim Diagnostics, from 1976 to 1988. Ms. Easthamthe Boston Consulting Group’s international consulting practice. Mr. Whitfield received a B.S. in Accountingmathematics from Oxford University and an M.B.A. from Indiana University and is a Certified Public Accountant.

PROPOSAL 2

APPROVAL OF AN AMENDMENT TO OUR AMENDED AND RESTATED 2017 PERFORMANCE INCENTIVE PLAN

At the Annual Meeting, our stockholders will be asked to approve an amendment to the Nektar Therapeutics Amended and Restated 2017 Performance Incentive Plan (the “2017 Plan” and as amended, the “A&R“Amended 2017 Plan”) to increase the authorized shares under the A&RAmended 2017 Plan by 10,000,0005,000,000 shares.The 2017 Plan was originally approved by our board of directors on March 28, 2017, subject to stockholder approval which was received on June 14, 2017, and was previously amended on June 26, 2018.2018, and further amended and restated on June 17, 2020. Our board of directors approved the A&RAmended 2017 Plan on March 31, 2020,24, 2021, subject to stockholder approval at the Annual Meeting.

Prior to the adoption of the 2017 Plan, the Company maintained the Nektar Therapeutics 2012 Plan, as amended (the “2012 Plan”), the Nektar Therapeutics 2008 Equity Incentive Plan, as amended (the “2008 Plan”), the Nektar Therapeutics 2000 Equity Incentive Plan, as amended (the “2000 Plan”), and the Nektar therapeutics 2000Non-Officer Equity Incentive Plan, as amended (the (“2000Non-Officer Plan”). The 2000Non-Officer Plan together with the 2012 Plan, the 2008 Plan and 2000 Plan, are referred to as the “Prior Plans.” Following stockholder approval of the 2017 Plan, no further awards were made under the Prior Plans. As of April 1, 2020, 10,465,7082021, 13,534,110 shares were subject to outstanding stock options and restricted stock units granted under the 2017 Plan and 5,038,0667,679,119 shares remained available for future grants.grants under the 2017 Plan. In addition, under the terms of the 2017 Plan, the reserve pool under the 2017 Plan may be increased by shares subject to awards granted under the Prior Plans that were outstanding as of December 31, 2017 in the event that such awards expire, or for any reason are cancelled or terminated, without being exercised. As of April 1, 2020 7,219,8132021, 5,070,047 shares remained subject to outstanding stock options and restricted stock units granted under the Prior Plans. If stockholders approve the amendment to the 2017 Plan, as of April 1, 2020,2021, the number of shares available for future awards under the A&RAmended 2017 Plan will increase by 10,000,0005,000,000 shares to 14,932,12112,679,119 shares.

Additional Information on Outstanding Awards and Available Shares under the 2017 Plan and the Prior Plans

The following provides additional information on the total equity compensation awards outstanding and available shares.

Based solely on the closing price of our common stock as reported by the NASDAQ Global Select Market on April 1, 20202021 and the maximum number of shares that would have been available for awards as of such date, taking into account the proposed increase described herein, the maximum aggregate market value of the common stock that could potentially be issued under the A&RAmended 2017 Plan is $262,506,687.$249,994,942.

Given the limited number of shares that currently remain available under the 2017 Plan, our board of directors and management believe it is important that this amendment be approved in order to maintain the

Company’s ability to grant stock-based awards to retain employees and continue to provide them with strong

under the A&RAmended 2017 Plan or the Prior Plans will again be available for subsequent awards under the A&RAmended 2017 Plan (with any such shares subject to full-value awards increasing the A&RAmended 2017 Plan’s share limit based on the full-value award ratio described above or, in the case of an award granted under a Prior Plan, the full-value award ratio set forth in such Prior Plan). Shares that are exchanged by a participant or withheld by the Company to pay

grant of the stock appreciation right and may not be less than the fair market value of a share of the Company’s common stock on the date of grant. Stock appreciation rights may be granted in connection with other awards or independently. The maximum term of a stock appreciation right is eight years from the date of grant.

Performance-Based Awards. The Administrator may grant performance-based awards under the A&RAmended 2017 Plan.    Performance-based awards are in addition to any of the other types of awards that may be granted under

performance measurement period applicable to any outstanding award will lapse and (iv) the performance goals applicable to any outstanding award (if any) will be deemed to be satisfied at the target, maximum or any other interim level.

Assumption and Termination of Awards. Generally, and subject to limited exceptions set forth in the A&RAmended 2017 Plan, upon the occurrence of a “change in control,” as defined in the A&RAmended 2017 Plan, the Administrator may provide for the cash payment in settlement of, or for the termination, assumption, substitution or exchange

Federal Income Tax Consequences of Awards under the A&RAmended 2017 Plan

The U.S. federal income tax consequences of the A&RAmended 2017 Plan under current federal law, which is subject to change, are summarized in the following discussion of the general tax principles applicable to the A&RAmended 2017 Plan. This summary is not intended to be exhaustive and, among other considerations, does not

lieu of providing information regarding benefits that will be received under the A&RAmended Plan, the following table provides information concerning the benefits that were received by the following personsperson and groups during 2019:2020: each named executive officer; all current executive officers,offers, as a group; all current directors who are not executive officers, as a group; and all current employees who are not executive officers, as a group.

PROPOSAL 3

APPROVAL OF AN AMENDMENT AND RESTATEMENT OF OUR AMENDED AND RESTATED EMPLOYEE STOCK PURCHASE PLAN

In February 1994, our board of directors adopted, and our stockholders subsequently approved, our Amended and Restated Employee Stock Purchase Plan (the “Purchase Plan”). The Purchase Plan was amended and restated in May 2002, and an amended and restated version of the Purchase Plan was approved by our stockholders in June 2002. In June 2014, an amended and restated version of the Purchase Plan was approved by our stockholders. On March 31, 2020, subject to stockholder approval, our board of directors amended the Purchase Plan to increase the number of shares of common stock available for issuance under the Purchase Plan by an additional 1,000,000 shares. Our board of directors adopted this amendment in order to ensure that a sufficient reserve of shares of common stock remains available for the grant of purchase rights under the Purchase Plan at levels determined appropriate by the board of directors.

Currently, 2,500,000 shares of common stock are authorized for issuance under the Purchase Plan. As of April 1, 2020, 573,266 shares of common stock remain available for future grant under the Purchase Plan. If stockholders approve the amendment and restatement to the Purchase Plan, the maximum number of shares authorized for issuance under the Purchase Plan will increase from 2,500,000 shares to 3,500,000 shares. If approved, the additional 1,000,000 shares would bring the total number of shares currently available for grant under the Purchase Plan to 1,573,266 shares.    

The additional shares that are proposed to be reserved under the amended and restated Purchase Plan have an aggregate value of $175,800,000, based on the April 1, 2020 closing price of our common stock, as reported on the NASDAQ Global Select Market, of $17.58 per share. We believe that the proposed share reserve increase to the Purchase Plan is reasonable, appropriate, and in the best interest of our stockholders. Stockholders are requested in this Proposal 3 to approve the amendment and restatement to the Purchase Plan. The affirmative vote of the holders of a majority of the shares present during the live webcast or represented by proxy at the Annual Meeting and cast on this proposal will be required to approve the amendment and restatement to the Purchase Plan. Abstentions and brokernon-votes, to the extent applicable, are not included in the tabulation of the voting results and therefore will not have an effect on the outcome of the vote.

THE BOARD OF DIRECTORS RECOMMENDS A VOTE IN FAVOR OF PROPOSAL 3.

The essential features of the Purchase Plan, as amended and restated (the “A&R Purchase Plan”), are outlined below:

Summary of the A&R Purchase Plan

The principal terms of the Purchase Plan, as proposed to be amended and restated, are summarized below. The following summary is qualified in its entirety by the full text of the A&R Purchase Plan, which appears as Exhibit B to this proxy statement.

Purpose.The purpose of the A&R Purchase Plan is (i) to provide a means by which our employees (and employees of any of our subsidiaries designated by the board of directors to participate in the A&R Purchase Plan) may be given an opportunity to purchase our common stock through payroll deductions, (ii) to assist us in retaining the services of our employees and secure and retain the services of new employees, and (iii) to provide incentives for such persons to exert maximum efforts for our success. All of our employees are eligible to participate in the A&R Purchase Plan provided that they satisfy the eligibility requirements described below.

The rights to purchase common stock granted under the A&R Purchase Plan are intended to qualify as options issued under an “employee stock purchase plan” as that term is defined in Section 423(b) of the Code.

PROPOSAL 54

ADVISORY VOTE ON EXECUTIVE COMPENSATIONJeff Ajer

TheJeff Ajer, age 58,was appointed to our board of directors is committedin September 2017. Mr. Ajer currently serves as Executive Vice President and Chief Commercial Officer at BioMarin Pharmaceutical Inc. (“BioMarin”), a global biotechnology company that develops and commercializes innovative therapies for people with serious and life-threatening rare disorders. From October 2012 to excellenceJanuary 2014, Mr. Ajer served as Senior Vice President and Chief Commercial Officer of BioMarin. From April 2009 to October 2012, Mr. Ajer served as BioMarin’s Vice President, Commercial Operations, The Americas, where he had responsibility for commercial operations throughout the Americas and led product marketing, reimbursement, and sales operations for BioMarin. Prior to joining BioMarin, Mr. Ajer served in governancevarious roles at Genzyme Corporation (“Genzyme”) beginning in November 2003, most recently as Vice President, Global Transplant Operations from December 2004 to August 2005. Mr. Ajer’s experience prior to Genzyme includes roles in sales, marketing and is awareoperations at SangStat Medical Corporation and ICN Pharmaceuticals. Mr. Ajer also served on the board of directors of True North Therapeutics. Mr. Ajer received both a B.S. in chemistry and an M.B.A. from the significant interest in executive compensation matters by investors and the general public.

We have designed our executive compensation program to attract, motivate, reward and retain the senior management talent required to achieve our corporate objectives and increase stockholder value. We believe that our compensation policies and procedures are centered onpay-for-performance principles and are strongly aligned with the long-term interestsUniversity of our stockholders.

We urge you to carefully review the Compensation Discussion and Analysis section of this proxy statement for details on our executive compensation, including our compensation philosophy and objectives and the 2019 compensation of the named executive officers (“NEOs”) described in the section titled “Compensation Program Objectives and Philosophy.”

We are presenting this proposal, which gives you as a stockholder the opportunity to endorse or not endorse our compensation program for the NEOs by voting for or against the following resolution (a“say-on-pay” vote), as required pursuant to Section 14A of the Exchange Act:California, Irvine.

“RESOLVED, thatRobert B. Chess

Robert B. Chess, age 64, is the compensation paid to the Company’s NEOs, as disclosed pursuant to Item 402Chairman of RegulationS-K promulgated by the SEC, including the Compensation Discussion and Analysis, compensation tables and related narrative discussion contained in the proxy statement for the Company’s 2020 Annual Meeting is hereby APPROVED.”

While the vote on the resolution is advisory in nature and therefore will not bind us to take any particular action, our board of directors and has served as a director since May 1992. From March 2006 until January 2007, Mr. Chess served as our Acting President and Chief Executive

Officer, and from April 1999 to January 2007, served as Executive Chairman. He also served as our Co-Chief Executive Officer from August 1998 to April 2000, as President from December 1991 to August 1998, and as Chief Executive Officer from May 1992 to August 1998. Mr. Chess was previously the co-founder and President of Penederm, Inc., a publicly-traded dermatological pharmaceutical company that was sold to Mylan Laboratories. He has held management positions at Intel Corporation and Metaphor Computer Systems (now part of IBM), and was a member of the first President Bush’s White House staff as a White House Fellow and Associate Director of the White House Office of Economic and Domestic Policy. From 1997 until his retirement in 2009, Mr. Chess served on the board of directors of the Biotechnology Industry Organization (“BIO”). Mr. Chess served as Chairman of BIO’s Emerging Companies Section and Compensation Committee intendCo-Chairman of BIO’s Intellectual Property Committee. Mr. Chess was the initial Chairman of Bio Ventures for Global Health and continues to carefully considerserve on its board. He also serves on the stockholder vote resultingBoard of Trustees of the California Institute of Technology where he chairs the Technology Transfer Committee. Mr. Chess serves on the board of directors and is the lead director of Twist Biosciences, a publicly-traded company in the synthetic biology field. He is currently a member of the faculty of the Stanford Graduate School of Business, where he teaches courses in the MBA program on the healthcare industry and the business opportunity created by aging demographics and increased longevity. Mr. Chess received his B.S. degree in Engineering with honors from the proposalCalifornia Institute of Technology and an M.B.A. from Harvard University.

Roy A. Whitfield

Roy A. Whitfield, age 67, has served as our director since August 2000 and as Lead Independent Director since January 2019. Mr. Whitfield is the former Chairman of the Board and Chief Executive Officer of Incyte Corporation (“Incyte”), a drug discovery and development company he co-founded in making1991. From January 1993 to November 2001, Mr. Whitfield served as its Chief Executive Officer and from November 2001 until June 2003 as its Chairman. He also served as a director of Incyte from 1991 to January 2014. From 1984 to 1989, Mr. Whitfield held senior operating and business development positions with Technicon Instruments Corporation (“Technicon”), a medical instrumentation company, and its predecessor company, Cooper Biomedical, Inc., a biotechnology and medical diagnostics company. Prior to his work at Technicon, Mr. Whitfield spent seven years with the Boston Consulting Group’s international consulting practice. Mr. Whitfield received a B.S. in mathematics from Oxford University and an M.B.A. from Stanford University.

THE BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” THE ELECTION OF EACH NAMED NOMINEE.

PROPOSAL 2

APPROVAL OF AN AMENDMENT TO OUR AMENDED AND RESTATED 2017 PERFORMANCE INCENTIVE PLAN

At the Annual Meeting, our stockholders will be asked to approve an amendment to the Nektar Therapeutics Amended and Restated 2017 Performance Incentive Plan (the “2017 Plan” and as amended, the “Amended 2017 Plan”) to increase the authorized shares under the Amended 2017 Plan by 5,000,000 shares.The 2017 Plan was originally approved by our board of directors on March 28, 2017, subject to stockholder approval which was received on June 14, 2017, was previously amended on June 26, 2018, and further amended and restated on June 17, 2020. Our board of directors approved the Amended 2017 Plan on March 24, 2021, subject to stockholder approval at the Annual Meeting.

Prior to the adoption of the 2017 Plan, the Company maintained the Nektar Therapeutics 2012 Plan, as amended (the “2012 Plan”), the Nektar Therapeutics 2008 Equity Incentive Plan, as amended (the “2008 Plan”), the Nektar Therapeutics 2000 Equity Incentive Plan, as amended (the “2000 Plan”), and the Nektar therapeutics 2000 Non-Officer Equity Incentive Plan, as amended (the (“2000 Non-Officer Plan”). The 2000 Non-Officer Plan together with the 2012 Plan, the 2008 Plan and 2000 Plan, are referred to as the “Prior Plans.” Following stockholder approval of the 2017 Plan, no further awards were made under the Prior Plans. As of April 1, 2021, 13,534,110 shares were subject to outstanding stock options and restricted stock units granted under the 2017 Plan and 7,679,119 shares remained available for future decisions regardinggrants under the 2017 Plan. In addition, under the terms of the 2017 Plan, the reserve pool under the 2017 Plan may be increased by shares subject to awards granted under the Prior Plans that were outstanding as of December 31, 2017 in the event that such awards expire, or for any reason are cancelled or terminated, without being exercised. As of April 1, 2021, 5,070,047 shares remained subject to outstanding stock options and restricted stock units granted under the Prior Plans. If stockholders approve the amendment to the 2017 Plan, as of April 1, 2021, the number of shares available for future awards under the Amended 2017 Plan will increase by 5,000,000 shares to 12,679,119 shares.

Additional Information on Outstanding Awards and Available Shares under the 2017 Plan and the Prior Plans

The following provides additional information on the total equity compensation awards outstanding and available shares.

Based solely on the closing price of our common stock as reported by the NASDAQ Global Select Market on April 1, 2021 and the maximum number of shares that would have been available for awards as of such date, taking into account the proposed increase described herein, the maximum aggregate market value of the common stock that could potentially be issued under the Amended 2017 Plan is $249,994,942.

Given the limited number of shares that currently remain available under the 2017 Plan, our board of directors and management believe it is important that this amendment be approved in order to maintain the

Company’s ability to grant stock-based awards to retain employees and continue to provide them with strong incentives to contribute to the Company’s future success. The Company believes that incentives and stock-based awards focus employees on the objective of creating stockholder value and promoting the success of the Company, and that incentive compensation program.plans like the 2017 Plan are an important attraction, retention and motivation tool for participants in the plan.

All members of the board of directors and all of the Company’s executive officers will be eligible for awards under the Amended 2017 Plan and thus have a personal interest in the approval of the amendment to the 2017 Plan.

TheStockholders are requested in this Proposal 2 to approve the amendment to the 2017 Plan. Approval of the amendment to the 2017 Plan requires the affirmative vote of a majority of the votes cast, by holders of the shares of common stock presentin person during the live webcast or representedby proxy, and entitled to vote at the Annual Meeting. Abstentions and broker non-votes, to the extent applicable, are not included in the tabulation of the voting results and therefore will not have an effect on the outcome of the vote. If stockholders do not approve this amendment, the 2017 Plan will continue in accordance with its current terms.

THE BOARD OF DIRECTORS RECOMMENDS A VOTE IN FAVOR OF PROPOSAL 2.

The essential features of the 2017 Plan, as proposed to be amended, are outlined below:

The principal terms of the Amended 2017 Plan are summarized below. The following summary is qualified in its entirety by the full text of the 2017 Plan and the amendment to the 2017 Plan, which appears as Exhibit A to this proxy statement.

Purpose. The purpose of the Amended 2017 Plan is to promote the success of the Company and the interests of our stockholders by providing an additional means for us to attract, motivate, retain and reward directors, officers, employees and other eligible persons through the grant of awards. Equity-based awards are also intended to further align the interests of award recipients and our stockholders.

Administration. Our board of directors or one or more committees appointed by our board of directors will administer the Amended 2017 Plan. Our board of directors has delegated general administrative authority for the Amended 2017 Plan to the organization and compensation committee of our board of directors. The organization and compensation committee may delegate some or all of its authority with respect to the Amended 2017 Plan to another committee of directors, and certain limited authority to grant awards to employees may be delegated to one or more officers of the Company. (The appropriate acting body, be it the board of directors, a committee within its delegated authority, or an officer within his or her delegated authority, is referred to in this proposal as the “Administrator”).

The Administrator has broad authority under the Amended 2017 Plan with respect to award grants including, without limitation, the authority:

No Repricing. In no case (except due to an adjustment to reflect a stock split or other events referred to under “Adjustments” below, or any repricing that may be approved by stockholders) will the Administrator (1) amend an outstanding stock option or stock appreciation right to reduce the exercise price or base price of the award, (2) cancel, exchange, or surrender an outstanding stock option or stock appreciation right in exchange for cash or other awards for the purpose of repricing the award, or (3) cancel, exchange, or surrender an outstanding stock option or stock appreciation right in exchange for an option or stock appreciation right with an exercise or base price that is less than the exercise or base price of the original award.

Eligibility. Persons eligible to receive awards under the Amended 2017 Plan include officers or employees of the Company or any of its subsidiaries, directors of the Company or any of its subsidiaries, and certain consultants and advisors to the Company or any of its subsidiaries. As of April 1, 2021, approximately 708 employees (including executive officers) and seven non-employee directors would be eligible to participate in the 2017 Plan.

Authorized Shares; Limits on Awards. Subject to the adjustment provisions included in the 2017 Plan, the maximum number of shares of the Company’s common stock initially available for issuance pursuant to awards under the 2017 Plan equaled 8,300,000 shares of the Company’s common stock (reduced by the number of shares of common stock subject to awards granted under the 2012 Plan on or after March 31, 2017 and prior to the adoption of the 2017 Plan), which was increased to 19,200,000 by stockholder approval in June 2018, and was increased to 29,200,000 by stockholder approval in June 2020. The proposed amendment to the 2017 Plan would increase the available shares to 34,200,000. Shares issued in respect of any “full-value award” granted under the Amended 2017 Plan will be counted against the share limit described in the preceding sentence as 1.50 shares for every one share actually issued in connection with the award. For example, if the Company granted 100 restricted stock units under the Amended 2017 Plan, 150 shares would be charged against the share limit with respect to that award. For this purpose, a “full-value award” generally means any award granted under the plan other than a stock option or stock appreciation right.

The following other limits are also contained in the Amended 2017 Plan:

Except as described in the next sentence, shares that are subject to or underlie awards which expire or for any reason are cancelled or terminated, are forfeited, fail to vest, or for any other reason are not paid or delivered

under the Amended 2017 Plan or the Prior Plans will again be available for subsequent awards under the Amended 2017 Plan (with any such shares subject to full-value awards increasing the Amended 2017 Plan’s share limit based on the full-value award ratio described above or, in the case of an award granted under a Prior Plan, the full-value award ratio set forth in such Prior Plan). Shares that are exchanged by a participant or withheld by the Company to pay the exercise price of an award granted under the Amended 2017 Plan, as well as any shares exchanged or withheld to satisfy the tax withholding obligations related to any award, will not be available for subsequent awards under the Amended 2017 Plan. To the extent that an award granted under the Amended 2017 Plan or a Prior Plan is settled in cash or a form other than shares, the shares that would have been delivered had there been no such cash or other settlement will again be available for subsequent awards under the Amended 2017 Plan (with any such shares subject to full-value awards increasing the Amended 2017 Plan’s share limit based on the full-value award ratio described above or, in the case of an award granted under a Prior Plan, the full-value award ratio set forth in such Prior Plan). In the event that shares are delivered in respect of a dividend equivalent right, the actual number of shares delivered with respect to the award shall be counted against the share limits of the Amended 2017 Plan. (For purposes of clarity, if 1,000 dividend equivalent rights are granted and outstanding when the Company pays a dividend, and 50 shares are delivered in payment of those rights with respect to that dividend, 75 shares (after adjustment for the full-value award share counting ratio described above) shall be counted against the share limits of the plan.) To the extent that shares are delivered pursuant to the exercise of a stock appreciation right or stock option, the number of underlying shares as to which the exercise related shall be counted against the applicable share limits, as opposed to only counting the shares issued. (For purposes of clarity, if a stock appreciation right relates to 100,000 shares and is exercised at a time when the payment due to the participant is 15,000 shares, 100,000 shares shall be charged against the applicable share limits with respect to such exercise.) In addition, the Amended 2017 Plan generally provides that shares issued in connection with awards that are granted by or become obligations of the Company through the assumption of awards (or in substitution for awards) in connection with an acquisition of another company will not count against the shares available for issuance under the Amended 2017 Plan. The Company may not increase the applicable share limits of the Amended 2017 Plan by repurchasing shares of common stock on the market (by using cash received through the exercise of stock options or otherwise).

Types of Awards. The Amended 2017 Plan authorizes stock options, stock appreciation rights, stock bonuses, restricted stock, performance stock, stock units, phantom stock or similar rights to purchase or acquire shares, whether at a fixed or variable price or ratio related to the common stock, upon the passage of time, the occurrence of one or more events or the satisfaction of performance criteria or other conditions, awards of any similar securities with a value derived from the value of or related to the common stock and/or returns thereon, or cash awards. The Amended 2017 Plan retains flexibility to offer competitive incentives and to tailor benefits to specific needs and circumstances. Awards granted under the Amended 2017 Plan will be subject to such terms and conditions as established by the Administrator and set forth in the underlying award agreement, including terms relating to the treatment of an award upon a termination of employment. Any award may be paid or settled in cash.

A stock option is the right to purchase shares of the Company’s common stock at a future date at a specified price per share (the “exercise price”). The per share exercise price of an option may not be less than the fair market value of a share of the Company’s common stock on the date of grant. The maximum term of an option is eight years from the date of grant. An option may either be an incentive stock option or a nonqualified stock option. Incentive stock option benefits are taxed differently from nonqualified stock options, as described under “Federal Income Tax Consequences of Awards Under the Amended 2017 Plan” below. Incentive stock options are also subject to more restrictive terms and are limited in amount by the U.S. Internal Revenue Code of 1986, as amended (the “Code”) and the Amended 2017 Plan. Incentive stock options may only be granted to employees of the Company or a subsidiary.

A stock appreciation right is the right to receive payment of an amount equal to the excess of the fair market value of share of the Company’s common stock on the date of exercise of the stock appreciation right over the base price of the stock appreciation right. The base price will be established by the Administrator at the time of

grant of the stock appreciation right and may not be less than the fair market value of a share of the Company’s common stock on the date of grant. Stock appreciation rights may be granted in connection with other awards or independently. The maximum term of a stock appreciation right is eight years from the date of grant.

Performance-Based Awards. The Administrator may grant performance-based awards under the Amended 2017 Plan.    Performance-based awards are in addition to any of the other types of awards that may be granted under the Amended 2017 Plan. Performance-based awards may be in the form of restricted stock, performance stock, stock units, other rights, or cash bonus opportunities.

The vesting or payment of performance-based awards may depend on the absolute or relative performance of the Company on a consolidated, subsidiary, segment, division, or business unit basis. The Administrator will establish the criterion or criteria and target(s) on which performance will be measured. The criteria that the Administrator may use for this purpose may include, without limitation, any one or more of the following: earnings per share; cash flow (which means cash and cash equivalents derived from either net cash flow from operations or net cash flow from operations, financing and investing activities); working capital; stock price; total stockholder return; revenue; gross profit; operating income; net earnings (before or after interest, taxes, depreciation and/or amortization); gross margin; operating margin; net margin; return on equity or on assets or on net investment; cost containment or reduction; regulatory submissions or approvals; manufacturing production; completion of strategic partnerships; research milestones; any other measure selected by the Administrator or any combination thereof. As applicable, these terms are used as applied under generally accepted accounting principles or in the financial reporting of the Company or of its subsidiaries. The applicable performance goals may be applied on a pre- or post-tax basis and may be adjusted to include or exclude determinable components of any performance goal, including, without limitation, foreign exchange gains and losses, asset write-downs, acquisitions and divestitures, change in fiscal year, unbudgeted capital expenditures, special charges such as restructuring or impairment charges, debt refinancing costs, extraordinary or noncash items, unusual, infrequently occurring, nonrecurring or one-time events affecting the Company or its financial statements or changes in law or accounting principles.

The performance measurement period with respect to an award may range from three months to ten years. Performance-based awards may be paid in stock or in cash (in either case, subject to the limits described under the heading “Authorized Shares; Limits on Awards” above). The Administrator has discretion to determine the performance target or targets and any other restrictions or other limitations of performance-based awards and may reserve discretion to reduce payments below maximum award limits.

Dividend Equivalents; Deferrals. The Administrator may provide for the deferred payment of awards, and may determine the other terms applicable to deferrals. The Administrator may provide that awards under the Amended 2017 Plan (other than options or stock appreciation rights), and/or deferrals, earn dividends or dividend equivalents based on the amount of dividends paid on outstanding shares of common stock, provided that as to any dividends or dividend equivalent rights granted in connection with an award granted under the Amended 2017 Plan that is subject to vesting requirements, no dividends or dividend equivalent payments will be made unless the related vesting conditions of the award are satisfied.

Award Agreements. Each award shall be evidenced by either (1) a written award agreement in a form approved by the Administrator and executed by the Company by an officer duly authorized to act on its behalf, or (2) an electronic notice of award grant in a form approved by the Administrator. The award agreement shall set forth the material terms and conditions of the award as established by the Administrator consistent with the express limitations of the Amended 2017 Plan. Notwithstanding anything in the Amended 2017 Plan to the contrary, the Administrator may approve an award agreement that, upon the termination of a participant’s employment or service, provides that, or may, in its sole discretion based on a review of all relevant facts and circumstances, otherwise take action regarding an award agreement such that (i) any or all outstanding stock options and stock appreciation rights will become exercisable in part or in full, (ii) all or a portion of the restriction or vesting period applicable to any outstanding award will lapse, (iii) all or a portion of the

performance measurement period applicable to any outstanding award will lapse and (iv) the performance goals applicable to any outstanding award (if any) will be deemed to be satisfied at the target, maximum or any other interim level.

Assumption and Termination of Awards. Generally, and subject to limited exceptions set forth in the Amended 2017 Plan, upon the occurrence of a “change in control,” as defined in the Amended 2017 Plan, the Administrator may provide for the cash payment in settlement of, or for the termination, assumption, substitution or exchange of any or all outstanding awards granted under the Amended 2017 Plan. To the extent the administrator does not provide for the assumption, substitution or other continuation of the awards, then all awards then-outstanding under the Amended 2017 Plan will become fully vested or paid, as applicable, and will terminate or be terminated in such circumstances, provided that the holder of a stock option or stock appreciation right would be given reasonable advance (but no more than ten days’) notice of the impending termination and a reasonable opportunity to exercise his or her vested stock option or stock appreciation right (after giving effect to any accelerated vesting required in the circumstances) in accordance with their terms before the termination of such awards. The Administrator also has the discretion to establish other change in control provisions with respect to awards granted under the Amended 2017 Plan. For example, the Administrator could provide for the acceleration of vesting or payment of an award in connection with a change in control and provide that any such acceleration shall be automatic upon the occurrence of any such event, including a termination of employment within a limited period of time following a corporate transaction.

Transfer Restrictions. Subject to certain exceptions contained in the Amended 2017 Plan, awards under the Amended 2017 Plan generally are not transferable by the recipient other than by will or the laws of descent and distribution and are generally exercisable, during the recipient’s lifetime, only by the recipient. Any amounts payable or shares issuable pursuant to an award generally will be paid only to the recipient or the recipient’s beneficiary or representative. The Administrator has discretion, however, to establish written conditions and procedures for the transfer of awards to other persons or entities, provided that such transfers comply with applicable federal and state securities laws and are not made for value (other than nominal consideration, settlement of marital property rights, or for interests in an entity in which more than 50% of the voting securities are held by the award recipient or by the recipient’s family members).

Adjustments. As is customary in incentive plans of this nature, each share limit and the number and kind of shares available under the Amended 2017 Plan and any outstanding awards, as well as the exercise or purchase prices of awards, and performance targets under certain types of performance-based awards, are subject to adjustment in the event of certain reorganizations, mergers, combinations, recapitalizations, stock splits, stock dividends, or other similar events that change the number or kind of shares outstanding, and extraordinary dividends or distributions of property to the stockholders.

No Limit on Other Authority. The Amended 2017 Plan does not limit the authority of the board of directors or any committee to grant awards or authorize any other compensation, with or without reference to the Company’s common stock, under any other plan or authority.

Termination of or Changes to the Amended 2017 Plan. The board of directors may amend or terminate the Amended 2017 Plan at any time and in any manner. Stockholder approval for an amendment will be required only to the extent then required by applicable law or any applicable listing agency or required under Sections 422 or 424 of the Code to preserve the intended tax consequences of the plan. Unless terminated earlier by the board of directors, the authority to grant new awards under the 2017 Plan will terminate on March 27, 2027. Outstanding awards, as well as the Administrator’s authority with respect thereto, generally will continue following the expiration or termination of the plan. Generally speaking, outstanding awards may be amended by the Administrator (except for a repricing), but the consent of the award holder is required if the amendment (or any plan amendment) materially and adversely affects the holder.

Clawback Policy. The awards under the Amended 2017 Plan are subject to the terms of the Company’s clawback policy as it may be in effect from time to time.

Federal Income Tax Consequences of Awards under the Amended 2017 Plan

The U.S. federal income tax consequences of the Amended 2017 Plan under current federal law, which is subject to change, are summarized in the following discussion of the general tax principles applicable to the Amended 2017 Plan. This summary is not intended to be exhaustive and, among other considerations, does not describe the deferred compensation provisions of Section 409A of the Code to the extent an award is subject to and does not satisfy those rules, nor does it describe state, local, or international tax consequences.

With respect to nonqualified stock options, the Company is generally entitled to deduct, except to the extent limited by Section 162(m) of the Code, and the participant recognizes taxable income in an amount equal to the difference between the option exercise price and the fair market value of the shares at the time of exercise. With respect to incentive stock options, the Company is generally not entitled to a deduction nor does the participant recognize income at the time of exercise, although if the participant is subject to the U.S. federal alternative minimum tax, the difference between the option exercise price and the fair market value of the shares at the time of exercise is includible for purposes of such alternative minimum tax. If the shares acquired by exercise of an incentive stock option are held for at least two years from the date the option was granted and one year from the date it was exercised, any gain or loss arising from a subsequent disposition of those shares will be taxed as long-term capital gain or loss, and the Company will not be entitled to any deduction. If, however, such shares are disposed of within the above-described period, then in the year of that disposition the participant will recognize compensation taxable as ordinary income equal to the excess of the lesser of (i) the amount realized upon that disposition and (ii) the excess of the fair market value of those shares on the date of exercise over the purchase price, and the Company will be entitled to a corresponding deduction, except to the extent limited by Section 162(m) of the Code.

The current federal income tax consequences of other awards authorized under the Amended 2017 Plan generally follow certain basic patterns: nontransferable restricted stock subject to a substantial risk of forfeiture results in income recognition equal to the excess of the fair market value over the price paid (if any) only at the time the restrictions constituting a substantial risk of forfeiture lapse (unless the recipient elects to accelerate recognition as of the date of grant); bonuses, restricted stock units, stock appreciation rights, cash and stock-based performance awards, dividend equivalents, stock units, and other types of awards are generally subject to tax at the time of payment; and compensation otherwise effectively deferred is taxed when paid. In each of the foregoing cases, the Company will generally have a corresponding deduction at the time the participant recognizes income, except to the extent limited by Section 162(m) of the Code.

If an award is accelerated under the Amended 2017 Plan in connection with a “change in control” (as defined in the Amended 2017 Plan), the Company may not be permitted to deduct the portion of the compensation attributable to the acceleration (“parachute payments”) if it exceeds certain threshold limits under Section 280G of the Code (and certain related excise taxes may be triggered). Furthermore, Section 162(m) of the Code limits to $1 million the amount that a publicly held corporation is allowed each year to deduct for compensation paid to the corporation’s “covered employees.” “Covered employees” include the corporation’s chief executive officer, chief financial officer and three next most highly compensated executive officers. If an individual is determined to be a covered employee for any year beginning after December 31, 2017, then that individual will continue to be a covered employee for future years, regardless of changes in the individual’s compensation or position. Beginning on or after January 1, 2027, the American Rescue Plan Act of 2021 (the “ARPA”) expands the applicability of Section 162(m) of the Code to also include the next five highest paid corporate officers so that the total number of covered employees subject to the $1 million deduction limitation will at least be 10.

New Plan Benefits

The Company has not approved any awards that are conditioned upon stockholder approval of the amendment to the 2017 Plan. The Administrator has the discretion to grant awards under the Amended 2017 Plan and, therefore, it is not possible as of the date of this proxy statement to determine future awards that will be received by the Company’s named executive officers or others under the Amended 2017 Plan. Accordingly, in

lieu of providing information regarding benefits that will be received under the Amended Plan, the following table provides information concerning the benefits that were received by the following person and groups during 2020: each named executive officer; all current executive offers, as a group; all current directors who are not executive officers, as a group; and all current employees who are not executive officers, as a group.

Equity Compensation Plan Information

The following table presents aggregate summary information as of December 31, 2020, regarding the common stock that may be issued upon the exercise of options and rights under all of our existing equity compensation plans:

THE BOARD OF DIRECTORS RECOMMENDS A VOTE IN FAVOR OF PROPOSAL 2 FOR APPROVAL OF THE AMENDMENT TO OUR AMENDED AND RESTATED 2017 PERFORMANCE INCENTIVE PLAN AS DESCRIBED ABOVE AND SET FORTH IN EXHIBIT A HERETO.

PROPOSAL 3

RATIFICATION OF SELECTION OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Audit Committee of the board of directors has selected Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2021, and has further directed that management submit the selection of our independent registered public accounting firm for ratification by the stockholders at the Annual Meeting. Ernst & Young LLP has audited our consolidated financial statements since our inception. Representatives of Ernst & Young LLP are expected to be present at the Annual Meeting. They will have an opportunity to make a statement if they so desire and will be available to respond to appropriate questions.

Neither our bylaws nor other governing documents or law require stockholder ratification of the selection of Ernst & Young LLP as our independent registered public accounting firm. However, the Audit Committee is submitting the selection of Ernst & Young LLP to the stockholders for ratification as a matter of good corporate practice. If the stockholders fail to ratify the selection, the Audit Committee will reconsider whether or not to retain Ernst & Young LLP. Even if the selection is ratified, the Audit Committee, in its discretion, may direct the appointment of a different independent registered public accounting firm at any time during the year if the committee determines that such a change would be in our best interests and our stockholders’ best interest.

The affirmative vote of the holders of a majority of the votes cast during the live webcast or by proxy at the Annual Meeting iswill be required (on anon-binding advisory basis)to ratify the selection of Ernst & Young LLP for approval of this proposal.our fiscal year ending December 31, 2021. Abstentions are treated as shares represented during the live webcast or by proxy and entitled to vote at the Annual Meeting and, therefore, will have the effect of a vote against this proposal. Brokerthe ratification of Ernst & Young LLP as our independent registered public accounting firm. No broker non-votes will have no effect on the outcome of the vote.are expected to exist in connection with this proposal.

THE BOARD OF DIRECTORS RECOMMENDS A VOTE IN FAVOR OF PROPOSAL 5.3.

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENTPROPOSAL 4

The following table sets forth certain information regarding the ownership of our common stock as of April 20, 2020, by: (i) each director and nominee for director; (ii) each of our NEOs; (iii) all of our executive officers and directors as a group; and (iv) all those known by us to be beneficial owners of more than five percent of our common stock.

Unless otherwise noted below, the address of each beneficial owner listed in the table is c/o Nektar Therapeutics, 455 Mission Bay Boulevard South, San Francisco, California 94158.

Officer, and from April 1999 to January 2007, served as Executive Chairman. He also served as ourCo-Chief Executive Officer from August 1998 to April 2000, as President from December 1991 to August 1998, and as Chief Executive Officer from May 1992 to August 1998. Mr. Chess was previously theco-founder and President of Penederm, Inc., a publicly-traded dermatological pharmaceutical company that was sold to Mylan Laboratories. He has held management positions at Intel Corporation and Metaphor Computer Systems (now part of IBM), and was a member of the first President Bush’s White House staff as a White House Fellow and Associate Director of the White House Office of Economic and Domestic Policy. From 1997 until his retirement in 2009, Mr. Chess served on the board of directors of the Biotechnology Industry Organization (“BIO”). Mr. Chess served as Chairman of BIO’s Emerging Companies Section andCo-Chairman of BIO’s Intellectual Property Committee. Mr. Chess was the initial Chairman of Bio Ventures for Global Health and continues to serve on its board. He also serves on the Board of Trustees of the California Institute of Technology where he chairs the Technology Transfer Committee. Mr. Chess is theco-founder and a member of the board of directors of Biota Technology, a private company developing applications ofDNA-sequencing for the energy industry, and also serves on the board of directors and is athe lead director of Twist Biosciences, a publicly-traded company in the synthetic DNA productionbiology field. He is currently a member of the faculty of the Stanford Graduate School of Business, where he teaches courses in the MBA program on starting technology-based businessesthe healthcare industry and the healthcare industry.business opportunity created by aging demographics and increased longevity. Mr. Chess received his B.S. degree in Engineering with honors from the California Institute of Technology and an M.B.A. from Harvard University.

Roy A. Whitfield

Roy A. Whitfield,, age 66, 67, has served as our director since August 2000 and as Lead Independent Director since January 2019. Mr. Whitfield is the former Chairman of the Board and Chief Executive Officer of Incyte Corporation (“Incyte”), a drug discovery and development company heco-founded in 1991. From January 1993

PROPOSAL 2

APPROVAL OF AN AMENDMENT TO OUR AMENDED AND RESTATED 2017 PERFORMANCE INCENTIVE PLAN

At the Annual Meeting, our stockholders will be asked to approve an amendment to the Nektar Therapeutics Amended and Restated 2017 Performance Incentive Plan (the “2017 Plan” and as amended, the “Amended 2017 Plan”) to increase the authorized shares under the Amended 2017 Plan by 5,000,000 shares.The 2017 Plan was originally approved by our board of directors on March 28, 2017, subject to stockholder approval which was received on June 14, 2017, was previously amended on June 26, 2018, and further amended and restated on June 17, 2020. Our board of directors approved the Amended 2017 Plan on March 24, 2021, subject to stockholder approval at the Annual Meeting.

Prior to the adoption of the 2017 Plan, the Company maintained the Nektar Therapeutics 2012 Plan, as amended (the “2012 Plan”), the Nektar Therapeutics 2008 Equity Incentive Plan, as amended (the “2008 Plan”), the Nektar Therapeutics 2000 Equity Incentive Plan, as amended (the “2000 Plan”), and the Nektar therapeutics 2000 Non-Officer Equity Incentive Plan, as amended (the (“2000 Non-Officer Plan”). The 2000 Non-Officer Plan together with the 2012 Plan, the 2008 Plan and 2000 Plan, are referred to as the “Prior Plans.” Following stockholder approval of the 2017 Plan, no further awards were made under the Prior Plans. As of April 1, 2021, 13,534,110 shares were subject to outstanding stock options and restricted stock units granted under the 2017 Plan and 7,679,119 shares remained available for future grants under the 2017 Plan. In addition, under the terms of the 2017 Plan, the reserve pool under the 2017 Plan may be increased by shares subject to awards granted under the Prior Plans that were outstanding as of December 31, 2017 in the event that such awards expire, or for any reason are cancelled or terminated, without being exercised. As of April 1, 2021, 5,070,047 shares remained subject to outstanding stock options and restricted stock units granted under the Prior Plans. If stockholders approve the amendment to the 2017 Plan, as of April 1, 2021, the number of shares available for future awards under the Amended 2017 Plan will increase by 5,000,000 shares to 12,679,119 shares.

Additional Information on Outstanding Awards and Available Shares under the 2017 Plan and the Prior Plans

The following provides additional information on the total equity compensation awards outstanding and available shares.

Based solely on the closing price of our common stock as reported by the NASDAQ Global Select Market on April 1, 2021 and the maximum number of shares that would have been available for awards as of such date, taking into account the proposed increase described herein, the maximum aggregate market value of the common stock that could potentially be issued under the Amended 2017 Plan is $249,994,942.

Given the limited number of shares that currently remain available under the 2017 Plan, our board of directors and management believe it is important that this amendment be approved in order to maintain the

Company’s ability to grant stock-based awards to retain employees and continue to provide them with strong incentives to contribute to the Company’s future success. The Company believes that incentives and stock-based awards focus employees on the objective of creating stockholder value and promoting the success of the Company, and that incentive compensation plans like the 2017 Plan are an important attraction, retention and motivation tool for participants in the plan.

All members of the board of directors and all of the Company’s executive officers will be eligible for awards under the Amended 2017 Plan and thus have a personal interest in the approval of the amendment to the 2017 Plan.

Stockholders are requested in this Proposal 2 to approve the amendment to the 2017 Plan. Approval of the amendment to the 2017 Plan requires the affirmative vote of a majority of the votes cast, in person during the live webcast or by proxy, and entitled to vote at the Annual Meeting. Abstentions and broker non-votes, to the extent applicable, are not included in the tabulation of the voting results and therefore will not have an effect on the outcome of the vote. If stockholders do not approve this amendment, the 2017 Plan will continue in accordance with its current terms.

THE BOARD OF DIRECTORS RECOMMENDS A VOTE IN FAVOR OF PROPOSAL 2.

The essential features of the 2017 Plan, as proposed to be amended, are outlined below:

The principal terms of the Amended 2017 Plan are summarized below. The following summary is qualified in its entirety by the full text of the 2017 Plan and the amendment to the 2017 Plan, which appears as Exhibit A to this proxy statement.

Purpose. The purpose of the Amended 2017 Plan is to promote the success of the Company and the interests of our stockholders by providing an additional means for us to attract, motivate, retain and reward directors, officers, employees and other eligible persons through the grant of awards. Equity-based awards are also intended to further align the interests of award recipients and our stockholders.

Administration. Our board of directors or one or more committees appointed by our board of directors will administer the Amended 2017 Plan. Our board of directors has delegated general administrative authority for the Amended 2017 Plan to the organization and compensation committee of our board of directors. The organization and compensation committee may delegate some or all of its authority with respect to the Amended 2017 Plan to another committee of directors, and certain limited authority to grant awards to employees may be delegated to one or more officers of the Company. (The appropriate acting body, be it the board of directors, a committee within its delegated authority, or an officer within his or her delegated authority, is referred to in this proposal as the “Administrator”).

The Administrator has broad authority under the Amended 2017 Plan with respect to award grants including, without limitation, the authority:

No Repricing. In no case (except due to an adjustment to reflect a stock split or other events referred to under “Adjustments” below, or any repricing that may be approved by stockholders) will the Administrator (1) amend an outstanding stock option or stock appreciation right to reduce the exercise price or base price of the award, (2) cancel, exchange, or surrender an outstanding stock option or stock appreciation right in exchange for cash or other awards for the purpose of repricing the award, or (3) cancel, exchange, or surrender an outstanding stock option or stock appreciation right in exchange for an option or stock appreciation right with an exercise or base price that is less than the exercise or base price of the original award.

Eligibility. Persons eligible to receive awards under the Amended 2017 Plan include officers or employees of the Company or any of its subsidiaries, directors of the Company or any of its subsidiaries, and certain consultants and advisors to the Company or any of its subsidiaries. As of April 1, 2021, approximately 708 employees (including executive officers) and seven non-employee directors would be eligible to participate in the 2017 Plan.

Authorized Shares; Limits on Awards. Subject to the adjustment provisions included in the 2017 Plan, the maximum number of shares of the Company’s common stock initially available for issuance pursuant to awards under the 2017 Plan equaled 8,300,000 shares of the Company’s common stock (reduced by the number of shares of common stock subject to awards granted under the 2012 Plan on or after March 31, 2017 and prior to the adoption of the 2017 Plan), which was increased to 19,200,000 by stockholder approval in June 2018, and was increased to 29,200,000 by stockholder approval in June 2020. The proposed amendment to the 2017 Plan would increase the available shares to 34,200,000. Shares issued in respect of any “full-value award” granted under the Amended 2017 Plan will be counted against the share limit described in the preceding sentence as 1.50 shares for every one share actually issued in connection with the award. For example, if the Company granted 100 restricted stock units under the Amended 2017 Plan, 150 shares would be charged against the share limit with respect to that award. For this purpose, a “full-value award” generally means any award granted under the plan other than a stock option or stock appreciation right.

The following other limits are also contained in the Amended 2017 Plan:

Except as described in the next sentence, shares that are subject to or underlie awards which expire or for any reason are cancelled or terminated, are forfeited, fail to vest, or for any other reason are not paid or delivered

under the Amended 2017 Plan or the Prior Plans will again be available for subsequent awards under the Amended 2017 Plan (with any such shares subject to full-value awards increasing the Amended 2017 Plan’s share limit based on the full-value award ratio described above or, in the case of an award granted under a Prior Plan, the full-value award ratio set forth in such Prior Plan). Shares that are exchanged by a participant or withheld by the Company to pay the exercise price of an award granted under the Amended 2017 Plan, as well as any shares exchanged or withheld to satisfy the tax withholding obligations related to any award, will not be available for subsequent awards under the Amended 2017 Plan. To the extent that an award granted under the Amended 2017 Plan or a Prior Plan is settled in cash or a form other than shares, the shares that would have been delivered had there been no such cash or other settlement will again be available for subsequent awards under the Amended 2017 Plan (with any such shares subject to full-value awards increasing the Amended 2017 Plan’s share limit based on the full-value award ratio described above or, in the case of an award granted under a Prior Plan, the full-value award ratio set forth in such Prior Plan). In the event that shares are delivered in respect of a dividend equivalent right, the actual number of shares delivered with respect to the award shall be counted against the share limits of the Amended 2017 Plan. (For purposes of clarity, if 1,000 dividend equivalent rights are granted and outstanding when the Company pays a dividend, and 50 shares are delivered in payment of those rights with respect to that dividend, 75 shares (after adjustment for the full-value award share counting ratio described above) shall be counted against the share limits of the plan.) To the extent that shares are delivered pursuant to the exercise of a stock appreciation right or stock option, the number of underlying shares as to which the exercise related shall be counted against the applicable share limits, as opposed to only counting the shares issued. (For purposes of clarity, if a stock appreciation right relates to 100,000 shares and is exercised at a time when the payment due to the participant is 15,000 shares, 100,000 shares shall be charged against the applicable share limits with respect to such exercise.) In addition, the Amended 2017 Plan generally provides that shares issued in connection with awards that are granted by or become obligations of the Company through the assumption of awards (or in substitution for awards) in connection with an acquisition of another company will not count against the shares available for issuance under the Amended 2017 Plan. The Company may not increase the applicable share limits of the Amended 2017 Plan by repurchasing shares of common stock on the market (by using cash received through the exercise of stock options or otherwise).

Types of Awards. The Amended 2017 Plan authorizes stock options, stock appreciation rights, stock bonuses, restricted stock, performance stock, stock units, phantom stock or similar rights to purchase or acquire shares, whether at a fixed or variable price or ratio related to the common stock, upon the passage of time, the occurrence of one or more events or the satisfaction of performance criteria or other conditions, awards of any similar securities with a value derived from the value of or related to the common stock and/or returns thereon, or cash awards. The Amended 2017 Plan retains flexibility to offer competitive incentives and to tailor benefits to specific needs and circumstances. Awards granted under the Amended 2017 Plan will be subject to such terms and conditions as established by the Administrator and set forth in the underlying award agreement, including terms relating to the treatment of an award upon a termination of employment. Any award may be paid or settled in cash.

A stock option is the right to purchase shares of the Company’s common stock at a future date at a specified price per share (the “exercise price”). The per share exercise price of an option may not be less than the fair market value of a share of the Company’s common stock on the date of grant. The maximum term of an option is eight years from the date of grant. An option may either be an incentive stock option or a nonqualified stock option. Incentive stock option benefits are taxed differently from nonqualified stock options, as described under “Federal Income Tax Consequences of Awards Under the Amended 2017 Plan” below. Incentive stock options are also subject to more restrictive terms and are limited in amount by the U.S. Internal Revenue Code of 1986, as amended (the “Code”) and the Amended 2017 Plan. Incentive stock options may only be granted to employees of the Company or a subsidiary.

A stock appreciation right is the right to receive payment of an amount equal to the excess of the fair market value of share of the Company’s common stock on the date of exercise of the stock appreciation right over the base price of the stock appreciation right. The base price will be established by the Administrator at the time of

grant of the stock appreciation right and may not be less than the fair market value of a share of the Company’s common stock on the date of grant. Stock appreciation rights may be granted in connection with other awards or independently. The maximum term of a stock appreciation right is eight years from the date of grant.

Performance-Based Awards. The Administrator may grant performance-based awards under the Amended 2017 Plan.    Performance-based awards are in addition to any of the other types of awards that may be granted under the Amended 2017 Plan. Performance-based awards may be in the form of restricted stock, performance stock, stock units, other rights, or cash bonus opportunities.

The vesting or payment of performance-based awards may depend on the absolute or relative performance of the Company on a consolidated, subsidiary, segment, division, or business unit basis. The Administrator will establish the criterion or criteria and target(s) on which performance will be measured. The criteria that the Administrator may use for this purpose may include, without limitation, any one or more of the following: earnings per share; cash flow (which means cash and cash equivalents derived from either net cash flow from operations or net cash flow from operations, financing and investing activities); working capital; stock price; total stockholder return; revenue; gross profit; operating income; net earnings (before or after interest, taxes, depreciation and/or amortization); gross margin; operating margin; net margin; return on equity or on assets or on net investment; cost containment or reduction; regulatory submissions or approvals; manufacturing production; completion of strategic partnerships; research milestones; any other measure selected by the Administrator or any combination thereof. As applicable, these terms are used as applied under generally accepted accounting principles or in the financial reporting of the Company or of its subsidiaries. The applicable performance goals may be applied on a pre- or post-tax basis and may be adjusted to include or exclude determinable components of any performance goal, including, without limitation, foreign exchange gains and losses, asset write-downs, acquisitions and divestitures, change in fiscal year, unbudgeted capital expenditures, special charges such as restructuring or impairment charges, debt refinancing costs, extraordinary or noncash items, unusual, infrequently occurring, nonrecurring or one-time events affecting the Company or its financial statements or changes in law or accounting principles.

The performance measurement period with respect to an award may range from three months to ten years. Performance-based awards may be paid in stock or in cash (in either case, subject to the limits described under the heading “Authorized Shares; Limits on Awards” above). The Administrator has discretion to determine the performance target or targets and any other restrictions or other limitations of performance-based awards and may reserve discretion to reduce payments below maximum award limits.

Dividend Equivalents; Deferrals. The Administrator may provide for the deferred payment of awards, and may determine the other terms applicable to deferrals. The Administrator may provide that awards under the Amended 2017 Plan (other than options or stock appreciation rights), and/or deferrals, earn dividends or dividend equivalents based on the amount of dividends paid on outstanding shares of common stock, provided that as to any dividends or dividend equivalent rights granted in connection with an award granted under the Amended 2017 Plan that is subject to vesting requirements, no dividends or dividend equivalent payments will be made unless the related vesting conditions of the award are satisfied.

Award Agreements. Each award shall be evidenced by either (1) a written award agreement in a form approved by the Administrator and executed by the Company by an officer duly authorized to act on its behalf, or (2) an electronic notice of award grant in a form approved by the Administrator. The award agreement shall set forth the material terms and conditions of the award as established by the Administrator consistent with the express limitations of the Amended 2017 Plan. Notwithstanding anything in the Amended 2017 Plan to the contrary, the Administrator may approve an award agreement that, upon the termination of a participant’s employment or service, provides that, or may, in its sole discretion based on a review of all relevant facts and circumstances, otherwise take action regarding an award agreement such that (i) any or all outstanding stock options and stock appreciation rights will become exercisable in part or in full, (ii) all or a portion of the restriction or vesting period applicable to any outstanding award will lapse, (iii) all or a portion of the

performance measurement period applicable to any outstanding award will lapse and (iv) the performance goals applicable to any outstanding award (if any) will be deemed to be satisfied at the target, maximum or any other interim level.

Assumption and Termination of Awards. Generally, and subject to limited exceptions set forth in the Amended 2017 Plan, upon the occurrence of a “change in control,” as defined in the Amended 2017 Plan, the Administrator may provide for the cash payment in settlement of, or for the termination, assumption, substitution or exchange of any or all outstanding awards granted under the Amended 2017 Plan. To the extent the administrator does not provide for the assumption, substitution or other continuation of the awards, then all awards then-outstanding under the Amended 2017 Plan will become fully vested or paid, as applicable, and will terminate or be terminated in such circumstances, provided that the holder of a stock option or stock appreciation right would be given reasonable advance (but no more than ten days’) notice of the impending termination and a reasonable opportunity to exercise his or her vested stock option or stock appreciation right (after giving effect to any accelerated vesting required in the circumstances) in accordance with their terms before the termination of such awards. The Administrator also has the discretion to establish other change in control provisions with respect to awards granted under the Amended 2017 Plan. For example, the Administrator could provide for the acceleration of vesting or payment of an award in connection with a change in control and provide that any such acceleration shall be automatic upon the occurrence of any such event, including a termination of employment within a limited period of time following a corporate transaction.

Transfer Restrictions. Subject to certain exceptions contained in the Amended 2017 Plan, awards under the Amended 2017 Plan generally are not transferable by the recipient other than by will or the laws of descent and distribution and are generally exercisable, during the recipient’s lifetime, only by the recipient. Any amounts payable or shares issuable pursuant to an award generally will be paid only to the recipient or the recipient’s beneficiary or representative. The Administrator has discretion, however, to establish written conditions and procedures for the transfer of awards to other persons or entities, provided that such transfers comply with applicable federal and state securities laws and are not made for value (other than nominal consideration, settlement of marital property rights, or for interests in an entity in which more than 50% of the voting securities are held by the award recipient or by the recipient’s family members).

Adjustments. As is customary in incentive plans of this nature, each share limit and the number and kind of shares available under the Amended 2017 Plan and any outstanding awards, as well as the exercise or purchase prices of awards, and performance targets under certain types of performance-based awards, are subject to adjustment in the event of certain reorganizations, mergers, combinations, recapitalizations, stock splits, stock dividends, or other similar events that change the number or kind of shares outstanding, and extraordinary dividends or distributions of property to the stockholders.

No Limit on Other Authority. The Amended 2017 Plan does not limit the authority of the board of directors or any committee to grant awards or authorize any other compensation, with or without reference to the Company’s common stock, under any other plan or authority.

Termination of or Changes to the Amended 2017 Plan. The board of directors may amend or terminate the Amended 2017 Plan at any time and in any manner. Stockholder approval for an amendment will be required only to the extent then required by applicable law or any applicable listing agency or required under Sections 422 or 424 of the Code to preserve the intended tax consequences of the plan. Unless terminated earlier by the board of directors, the authority to grant new awards under the 2017 Plan will terminate on March 27, 2027. Outstanding awards, as well as the Administrator’s authority with respect thereto, generally will continue following the expiration or termination of the plan. Generally speaking, outstanding awards may be amended by the Administrator (except for a repricing), but the consent of the award holder is required if the amendment (or any plan amendment) materially and adversely affects the holder.

Clawback Policy. The awards under the Amended 2017 Plan are subject to the terms of the Company’s clawback policy as it may be in effect from time to time.

Federal Income Tax Consequences of Awards under the Amended 2017 Plan

The U.S. federal income tax consequences of the Amended 2017 Plan under current federal law, which is subject to change, are summarized in the following discussion of the general tax principles applicable to the Amended 2017 Plan. This summary is not intended to be exhaustive and, among other considerations, does not describe the deferred compensation provisions of Section 409A of the Code to the extent an award is subject to and does not satisfy those rules, nor does it describe state, local, or international tax consequences.

With respect to nonqualified stock options, the Company is generally entitled to deduct, except to the extent limited by Section 162(m) of the Code, and the participant recognizes taxable income in an amount equal to the difference between the option exercise price and the fair market value of the shares at the time of exercise. With respect to incentive stock options, the Company is generally not entitled to a deduction nor does the participant recognize income at the time of exercise, although if the participant is subject to the U.S. federal alternative minimum tax, the difference between the option exercise price and the fair market value of the shares at the time of exercise is includible for purposes of such alternative minimum tax. If the shares acquired by exercise of an incentive stock option are held for at least two years from the date the option was granted and one year from the date it was exercised, any gain or loss arising from a subsequent disposition of those shares will be taxed as long-term capital gain or loss, and the Company will not be entitled to any deduction. If, however, such shares are disposed of within the above-described period, then in the year of that disposition the participant will recognize compensation taxable as ordinary income equal to the excess of the lesser of (i) the amount realized upon that disposition and (ii) the excess of the fair market value of those shares on the date of exercise over the purchase price, and the Company will be entitled to a corresponding deduction, except to the extent limited by Section 162(m) of the Code.

The current federal income tax consequences of other awards authorized under the Amended 2017 Plan generally follow certain basic patterns: nontransferable restricted stock subject to a substantial risk of forfeiture results in income recognition equal to the excess of the fair market value over the price paid (if any) only at the time the restrictions constituting a substantial risk of forfeiture lapse (unless the recipient elects to accelerate recognition as of the date of grant); bonuses, restricted stock units, stock appreciation rights, cash and stock-based performance awards, dividend equivalents, stock units, and other types of awards are generally subject to tax at the time of payment; and compensation otherwise effectively deferred is taxed when paid. In each of the foregoing cases, the Company will generally have a corresponding deduction at the time the participant recognizes income, except to the extent limited by Section 162(m) of the Code.

If an award is accelerated under the Amended 2017 Plan in connection with a “change in control” (as defined in the Amended 2017 Plan), the Company may not be permitted to deduct the portion of the compensation attributable to the acceleration (“parachute payments”) if it exceeds certain threshold limits under Section 280G of the Code (and certain related excise taxes may be triggered). Furthermore, Section 162(m) of the Code limits to $1 million the amount that a publicly held corporation is allowed each year to deduct for compensation paid to the corporation’s “covered employees.” “Covered employees” include the corporation’s chief executive officer, chief financial officer and three next most highly compensated executive officers. If an individual is determined to be a covered employee for any year beginning after December 31, 2017, then that individual will continue to be a covered employee for future years, regardless of changes in the individual’s compensation or position. Beginning on or after January 1, 2027, the American Rescue Plan Act of 2021 (the “ARPA”) expands the applicability of Section 162(m) of the Code to also include the next five highest paid corporate officers so that the total number of covered employees subject to the $1 million deduction limitation will at least be 10.

New Plan Benefits

The Company has not approved any awards that are conditioned upon stockholder approval of the amendment to the 2017 Plan. The Administrator has the discretion to grant awards under the Amended 2017 Plan and, therefore, it is not possible as of the date of this proxy statement to determine future awards that will be received by the Company’s named executive officers or others under the Amended 2017 Plan. Accordingly, in

lieu of providing information regarding benefits that will be received under the Amended Plan, the following table provides information concerning the benefits that were received by the following person and groups during 2020: each named executive officer; all current executive offers, as a group; all current directors who are not executive officers, as a group; and all current employees who are not executive officers, as a group.

Equity Compensation Plan Information

The following table presents aggregate summary information as of December 31, 2020, regarding the common stock that may be issued upon the exercise of options and rights under all of our existing equity compensation plans:

THE BOARD OF DIRECTORS RECOMMENDS A VOTE IN FAVOR OF PROPOSAL 2 FOR APPROVAL OF THE AMENDMENT TO OUR AMENDED AND RESTATED 2017 PERFORMANCE INCENTIVE PLAN AS DESCRIBED ABOVE AND SET FORTH IN EXHIBIT A HERETO.

PROPOSAL 3

RATIFICATION OF SELECTION OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Audit Committee of the board of directors has selected Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2021, and has further directed that management submit the selection of our independent registered public accounting firm for ratification by the stockholders at the Annual Meeting. Ernst & Young LLP has audited our consolidated financial statements since our inception. Representatives of Ernst & Young LLP are expected to be present at the Annual Meeting. They will have an opportunity to make a statement if they so desire and will be available to respond to appropriate questions.

Neither our bylaws nor other governing documents or law require stockholder ratification of the selection of Ernst & Young LLP as our independent registered public accounting firm. However, the Audit Committee is submitting the selection of Ernst & Young LLP to the stockholders for ratification as a matter of good corporate practice. If the stockholders fail to ratify the selection, the Audit Committee will reconsider whether or not to retain Ernst & Young LLP. Even if the selection is ratified, the Audit Committee, in its discretion, may direct the appointment of a different independent registered public accounting firm at any time during the year if the committee determines that such a change would be in our best interests and our stockholders’ best interest.

The affirmative vote of the holders of a majority of the votes cast during the live webcast or by proxy at the Annual Meeting will be required to ratify the selection of Ernst & Young LLP for our fiscal year ending December 31, 2021. Abstentions are treated as shares represented during the live webcast or by proxy and entitled to vote at the Annual Meeting and, therefore, will have the effect of a vote against the ratification of Ernst & Young LLP as our independent registered public accounting firm. No broker non-votes are expected to exist in connection with this proposal.

THE BOARD OF DIRECTORS RECOMMENDS A VOTE IN FAVOR OF PROPOSAL 3.

PROPOSAL 4

ADVISORY VOTE ON EXECUTIVE COMPENSATION

The board of directors is committed to excellence in governance and is aware of the significant interest in executive compensation matters by investors and the general public.

We have designed our executive compensation program to attract, motivate, reward and retain the senior management talent required to achieve our corporate objectives and increase stockholder value. We believe that our compensation policies and procedures are centered on pay-for-performance principles and are strongly aligned with the long-term interests of our stockholders.

We urge you to carefully review the Compensation Discussion and Analysis section of this proxy statement for details on our executive compensation, including our compensation philosophy and objectives and the 2020 compensation of the named executive officers (“NEOs”) described in the section titled “Compensation Program Objectives and Philosophy.”

We are presenting this proposal, which gives you as a stockholder the opportunity to endorse or not endorse our compensation program for the NEOs by voting for or against the following resolution (a “say-on-pay” vote), as required pursuant to Section 14A of the Exchange Act:

“RESOLVED, that the compensation paid to the Company’s NEOs, as disclosed pursuant to Item 402 of Regulation S-K promulgated by the SEC, including the Compensation Discussion and Analysis, compensation tables and related narrative discussion contained in the proxy statement for the Company’s 2021 Annual Meeting is hereby APPROVED.”

While the vote on the resolution is advisory in nature and therefore will not bind us to take any particular action, our board of directors and our Organization and Compensation Committee intend to carefully consider the stockholder vote resulting from the proposal in making future decisions regarding our compensation program.

The affirmative vote of a majority of the votes cast by holders of the shares of common stock present during the live webcast or represented by proxy at the Annual Meeting is required (on a non-binding advisory basis) for approval of this proposal. Abstentions are treated as shares represented during the live webcast or by proxy and entitled to vote at the Annual Meeting and, therefore, will have the effect of a vote against this proposal. Broker non-votes will have no effect on the outcome of the vote.

THE BOARD OF DIRECTORS RECOMMENDS A VOTE IN FAVOR OF PROPOSAL 4.

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

The following table sets forth certain information regarding the ownership of our common stock as of April 12, 2021, by: (i) each director and nominee for director; (ii) each of our NEOs; (iii) all of our executive officers and directors as a group; and (iv) all those known by us to be beneficial owners of more than five percent of our common stock.

Unless otherwise noted below, the address of each beneficial owner listed in the table is c/o Nektar Therapeutics, 455 Mission Bay Boulevard South, San Francisco, California 94158.

SECTION 16(A) REPORTS

Section 16(a) of the Exchange Act requires our directors and executive officers, and persons who beneficially own more than ten percent of a registered class of our equity securities, to file with the SEC initial reports of ownership and reports of changes in ownership of our common stock and other equity securities. Officers, directors and greater than ten percent beneficial owners are required by SEC regulations to furnish us with copies of all Section 16(a) forms they file.

To our knowledge, based solely on our review of Forms 3, 4 and 5, and any amendments thereto, furnished to us or written representations that no Form 5 was required, we believe that during the fiscal year ended December 31, 2020, all filing requirements applicable to our executive officers and directors under the Exchange Act were met in a timely manner.

CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS

We review all relationships and transactions between us and (i) any of our directors or executive officers, (ii) any nominee for election as a director, (iii) any security holder who is known to us to own beneficially or of record more than five percent of our common stock or (iv) any member of the immediate family of any of the foregoing. Our legal staff is primarily responsible for the development and implementation of processes and controls to obtain information with respect to related person transactions and for then determining, based on the facts and circumstances, whether the Company or a related person has a direct or indirect material interest in the transaction. In addition, the Audit Committee reviews and approves or ratifies any related person transaction that is required to be disclosed. In the course of its review and approval or ratification of a disclosable related party transaction, the committee considers:

Any member of the Audit Committee who is a related person with respect to a transaction under review may not participate in the deliberations or vote respecting approval or ratification of the transaction; however, such director may be counted in determining the presence of a quorum at a meeting where the Audit Committee reviews the transaction.

As required under SEC rules, related party transactions that are determined to be directly or indirectly material to us or the related party are disclosed in our proxy statement. Historically, we have not entered into transactions with related parties. Michael Robin, the son of Howard W. Robin, our President and Chief Executive Officer, is employed by the Company in a non-executive officer capacity as a vice-president in our project management group. During 2020, Michael Robin’s total compensation was approximately $904,345.31 including base salary, bonus, spot awards, RSUs and benefits. Michael Robin’s 2020 compensation is comprised of 44% equity-based compensation. Michael Robin’s compensation was established by the Company in accordance with its compensation practices applicable to employees with equivalent qualifications and responsibilities and holding similar positions, without the direct involvement of Howard W. Robin. During the 2020 fiscal year, there were no other relationships or transactions between us and any related party for which disclosure is required under the rules of the SEC.

INFORMATION ABOUT THE BOARD OF DIRECTORS

The following is a brief biography of each current director, including each nominee for reelection at the Annual Meeting to a new term of office and each director whose current term of office continues through the Annual Meeting.

THE BOARD OF DIRECTORS

DIRECTORS CONTINUINGIN OFFICE UUNTILNTILTHE 2022 ANNUAL MEETING

R. Scott Greer

R. Scott Greer, age 61,62, has served as our director since February 2010. Mr. Greer currently serves as Managing Director of Numenor Ventures, LLC, a venture capital firm. In 1996, Mr. Greerco-founded Abgenix, Inc., a company that specialized in the discovery, development and manufacture of human therapeutic antibodies, and from June 1996 through May 2002, he served as its Chief Executive Officer. He also served as a director of Abgenix from 1996 and Chairman of the board of directors from 2000 until the acquisition of Abgenix by Amgen, Inc. in April 2006. Prior to Abgenix’s formation, Mr. Greer held senior management positions at Cell Genesys, Inc., a biotechnology company, initially as Chief Financial Officer and Vice President of Corporate Development and later as Senior Vice President of Corporate Development, and various positions at Genetics Institute, Inc., a biotechnology research and development company. He currently serves as a member of the board of directors of Inogen, Inc., a medical device company that develops and markets oxygen therapy products. Mr. Greer served as a member of the board of directors of Sientra, Inc., a medical aesthetics company from 2014-2018,Versartis, Inc., an endocrine focused biopharmaceutical company from 2014-2018, Auspex Pharmaceuticals, a biopharmaceutical company developing drugs for patients with movement disorders and other rare diseases from 2014-2015, Sirna Therapeutics, Inc., a biotechnology company, from 2003, and as its Chairman of the board of directors from 2005, through the closing of the acquisition of Sirna by Merck & Co., Inc. in December 2006. From 2001 to 2005, Mr. Greer served as a member of the board of directors of Illumina, Inc., a provider of integrated systems for the analysis of genetic variation and biological function; and from 2001 to 2004, he served as member of the board of directors of CV Therapeutics, Inc., a biotechnology company. Mr. Greer also served as a member of the board of directors of StemCells, Inc., a biopharmaceutical company focused on stem cell therapeutics from 2010 to 2016 and additionally from 2010-2016 was Chairman of the board of Ablexis, an antibody technology company. Mr. Greer received a B.A. in Economics from Whitman College and an M.B.A. degree from Harvard University. He also was a certified public accountant.

Lutz Lingnau

Lutz Lingnau, age 77, has served as our director since August 2007. Mr. Lingnau retired from Schering AG Group, Germany, in December 2005 as a member of Schering AG’s Executive Board and as Vice Chairman, President and Chief Executive Officer of Schering Berlin, Inc., a United States subsidiary. Prior to his retirement, Mr. Lingnau was responsible for Schering AG’s worldwide specialized therapeutics and dermatology businesses. He joined Schering AG’s business trainee program in 1966. Throughout his career at Schering AG, he served in various capacities and in a number of subsidiaries in South America and the United States, including his roles as President of Berlex Laboratories, Inc., from 1983 to 1985, as the Head of Worldwide Sales and Marketing in the Pharmaceutical Division of Schering AG, from 1985 to 1989, and as Chairman of Berlex Laboratories, Inc. from 1985 to 2005. Mr. Lingnau was a member of the Supervisory Board of LANXESS AG, a specialty chemicals company listed on the Frankfurt Stock Exchange from 2005 to May 2010. From December 2006 through September 2009, he served as Chairman of the board of directors of Micropharma Limited, a private biotechnology company, and was a member of the board of directors of Sirna Therapeutics, Inc., a biotechnology company, from February 2006 through the closing of the acquisition of Sirna by Merck & Co., Inc. in December 2006.

served on the board of directors of Geron Corporation since March 2009, Veracyte, Inc. since December 2012, and Personalis, Inc. since November 2019. Ms. Eastham served as a member of the board of directors of IluminaIllumina Inc. from August 2004 to May 2019, MorphoSys AG from May 2012 to May 2017, Amylin Pharmaceuticals, Inc. from September 2005 until its acquisition in August 2012, Genoptix, Inc. from July 2008 until its acquisition in March 2011, Tercica, Inc. from December 2003 until its acquisition in October 2008, and Trius Therapeutics, Inc. from February 2007 until its acquisition in September 2013. From May 2004 to September 2008, Ms. Eastham served as Executive Vice President and Chief Operating Officer, and as a member of the Board of Trustees, of the Burnham Institute for Medical Research (now Sanford Burnham Prebys Medical Discovery Institute), anon-profit corporation engaged in biomedical research. From April 1999 to May 2004, Ms. Eastham served as Senior Vice President, Chief Financial Officer and Secretary of Diversa Corporation, a biotechnology company. Ms. Eastham previously held similar positions with CombiChem, Inc., a computational chemistry company, and Cytel Corporation, a biopharmaceutical company. Ms. Eastham also held several positions, including Vice President, Finance, at Boehringer Mannheim Diagnostics, from 1976 to 1988. Ms. Eastham received a B.S. in Accounting and an M.B.A. from Indiana University and is a Certified Public Accountant.

Howard W. Robin

Howard W. Robin, age 67,68, has served as our President and Chief Executive Officer since January 2007 and has served as a member of our board of directors since February 2007. Mr. Robin served as Chief Executive Officer, President and a director of Sirna Therapeutics, Inc., a biotechnology company, from July 2001 to November 2006 and from January 2001 to June 2001, served as their Chief Operating Officer, President and as a director. From 1991 to 2001, Mr. Robin was Corporate Vice President and General Manager at Berlex Laboratories, Inc. (“Berlex”), a pharmaceutical products company that is a subsidiary of Schering, AG, and from 1987 to 1991 he served as Vice President of Finance and Business Development and Chief Financial Officer. From 1984 to 1987, Mr. Robin was Director of Business Planning and Development at Berlex. He was a Senior Associate with Arthur Andersen & Co. prior to joining Berlex. He received his B.S. in Accounting and Finance from Fairleigh Dickinson University and serves as a member of its Board of Trustees.

CURRENT DIRECTORS NOMINATEDFOR REELECTIONTO SERVE UNTILTHE 2024 ANNUAL MEETING

Jeff Ajer

Jeff Ajer, age 58,was appointed to our board of directors in September 2017. Mr. Ajer currently serves as Executive Vice President and Chief Commercial Officer at BioMarin Pharmaceutical Inc. (“BioMarin”), a global biotechnology company that develops and commercializes innovative therapies for people with serious and life-threatening rare disorders. From October 2012 to January 2014, Mr. Ajer served as Senior Vice President and Chief Commercial Officer of BioMarin. From April 2009 to October 2012, Mr. Ajer served as BioMarin’s Vice President, Commercial Operations, The Americas, where he had responsibility for commercial operations throughout the Americas and led product marketing, reimbursement, and sales operations for BioMarin. Prior to joining BioMarin, Mr. Ajer served in various roles at Genzyme Corporation (“Genzyme”) beginning in November 2003, most recently as Vice President, Global Transplant Operations from December 2004 to August 2005. Mr. Ajer’s experience prior to Genzyme includes roles in sales, marketing and operations at SangStat Medical Corporation and ICN Pharmaceuticals. Mr. Ajer also served on the board of directors of True North Therapeutics. Mr. Ajer received both a B.S. in chemistry and an M.B.A. from the University of California, Irvine.

Robert B. Chess

Robert B. Chess, age 64, is the Chairman of our board of directors and has served as a director since May 1992. From March 2006 until January 2007, Mr. Chess served as our Acting President and Chief Executive Officer, and from April 1999 to January 2007, served as Executive Chairman. He also served as our Co-Chief Executive Officer from August 1998 to April 2000, as President from December 1991 to August 1998, and as

Chief Executive Officer from May 1992 to August 1998. Mr. Chess was previously the co-founder and President of Penederm, Inc., a publicly-traded dermatological pharmaceutical company that was sold to Mylan Laboratories. He has held management positions at Intel Corporation and Metaphor Computer Systems (now part of IBM), and was a member of the first President Bush’s White House staff as a White House Fellow and Associate Director of the White House Office of Economic and Domestic Policy. From 1997 until his retirement in 2009, Mr. Chess served on the board of directors of the Biotechnology Industry Organization (“BIO”). Mr. Chess served as Chairman of BIO’s Emerging Companies Section and Co-Chairman of BIO’s Intellectual Property Committee. Mr. Chess was the initial Chairman of Bio Ventures for Global Health and continues to serve on its board. He also serves on the Board of Trustees of the California Institute of Technology where he chairs the Technology Transfer Committee. Mr. Chess serves on the board of directors and is the lead director of Twist Biosciences, a publicly-traded company in the synthetic biology field. He is currently a member of the faculty of the Stanford Graduate School of Business, where he teaches courses in the MBA program on the healthcare industry and the business opportunity created by aging demographics and increased longevity. Mr. Chess received his B.S. degree in Engineering with honors from the California Institute of Technology and an M.B.A. from Harvard University.

Roy A. Whitfield

Roy A. Whitfield, age 67, has served as our director since August 2000 and as Lead Independent Director since January 2019. Mr. Whitfield is the former Chairman of the Board and Chief Executive Officer of Incyte Corporation (“Incyte”), a drug discovery and development company he co-founded in 1991. From January 1993 to November 2001, Mr. Whitfield served as its Chief Executive Officer and from November 2001 until June 2003 as its Chairman. He also served as a director of Incyte from 1991 to January 2014. From 1984 to 1989, Mr. Whitfield held senior operating and business development positions with Technicon Instruments Corporation (“Technicon”), a medical instrumentation company, and its predecessor company, Cooper Biomedical, Inc., a biotechnology and medical diagnostics company. Prior to his work at Technicon, Mr. Whitfield spent seven years with the Boston Consulting Group’s international consulting practice. Mr. Whitfield received a B.S. in mathematics from Oxford University and an M.B.A. from Stanford University.

MEETINGSOFTHE BOARDOF DIRECTORS

The board of directors met thirteen (13) times during 2019.2020. For the term of service during which he or she was a director in fiscal year 2019,2020, each board member attended 75% or more of the aggregate of the board meetings and key committee meetings. All of our directors on our board except Dr. Myriam J. Curet (who was appointed to the board effective as of December 12, 2019), attended our 20192020 annual meeting of stockholders.

BOARD LEADERSHIP STRUCTURE

The positions of Chief Executive Officer and Chairman of the board of directors are currently held by Howard W. Robin and Robert B. Chess, respectively. The board of directors believes at this time having a separate chairman provides a more effective channel for the board of directors to express its views on management, by enhancing the board’s oversight of, and independence from, management, and allows the Chief Executive Officer to focus more on the strategy and operations of the Company.

Lead Independent Director

Roy A. Whitfield serves as our Lead Independent Director. The board of directors believes that a robust Lead Independent Director role facilitates independent board oversight of management. In accordance with the Company’s revised Corporate Governance Policy Statement approved by the Board on February 4, 2019, the Lead Independent Director shall, among other things, (i) have authority to call meetings of the independent directors; (ii) chair meetings of the independent directors in the event the Chairman of the board of directors is not independent; (iii) serve as a liaison between the Chairman of the board and the independent directors; (iv) approve information sent to the board; (v) approve meeting agendas for the board; (vi) approve meeting schedules for the board to assure that there is sufficient time for discussion of all agenda items; and (vii) have such other duties and responsibilities as may be assigned by the board from time to time.

RISK OVERSIGHT

The board of directors monitors and assesses key business risks directly through deliberations of the board of directors and also by way of delegation of certain risk oversight functions to be performed by committees of the board of directors. The board of directors regularly reviews and assesses, among other matters, the following important areas that present both opportunities and risk to the Company’s business:

The discussion above of risk oversight matters reviewed by the board of directors is intended to be illustrative only and not a complete list of all important matters reviewed and considered by the board of directors in providing oversight and direction for the Company’s senior management and business.

The risk oversight function of the board of directors is also administered through various board committees. The Audit Committee oversees the management of financial, accounting, internal controls, disclosure controls and the engagement arrangement and regular oversight of the independent auditors. The Audit Committee also periodically reviews the Company’s investment policy for its cash reserves, corporate insurance policies, information technology infrastructure and general fraud monitoring practices and procedures, including the maintenance and monitoring of a whistleblower hotline and the segregation of duties and access controls across various functions. To assist the Audit Committee in its risk management oversight function, the internal auditor has a direct reporting relationship to the Audit Committee. The Company’s internal audit function is focused on internal control monitoring and activities in support of the Audit Committee’s risk oversight function.

The Organization and Compensation Committee is responsible for the design and oversight of the Company’s compensation programs as well as succession planning for the chief executive officer position and other key executive positions. The Organization and Compensation Committee regularly considers whether the Company’s compensation policies and practices create risks that could have a material adverse impact on the Company and has concluded that they do not based on several design features of our compensation program that we believe reduces the likelihood of excessive risk-taking, including the following:

Company. The board of directors is committed to continuing to ensure and evolve its risk oversight practices as appropriate given the stage of the Company’s evolution as a research-based development stage biopharmaceutical company and the fast-paced changes in the biopharmaceutical industry. In that regard, in 2019 the Company maintained a risk management committee composed of senior managers in charge of important functional areas that regularly reported to the board of directors or one of its designated committees.

INDEPENDENCEOFTHE BOARD OFOF DIRECTORS

As required under the NASDAQ Global Select Market listing standards, a majority of the members of a listed company’s board of directors must qualify as “independent,” as affirmatively determined by the board of directors. Our board consults with counsel to ensure that its determinations are consistent with all relevant securities and other laws and regulations regarding the definition of “independent,” including those set forth in pertinent NASDAQ listing standards, as in effect from time to time.

Consistent with these standards, after review of all relevant transactions (if any) or relationships between each director, or any of his or her family members, and us, our senior management and our independent registered public accounting firm, the board has affirmatively determined that all of our directors are independent directors within the meaning of the applicable NASDAQ listing standards, except for Mr. Robin, our President and Chief Executive Officer.

As required under applicable NASDAQ listing standards, in the 20192020 fiscal year, our independent directors met at least four times in regularly scheduled executive sessions. The Chairman of the boardLead Director presided over such sessions at which only independent directors were present.

AUDIT COMMITTEE

The Audit Committee of the board of directors oversees our corporate accounting and financial reporting process. For this purpose, the Audit Committee performs several functions. The Audit Committee:

development of the Company. Additionally, the Organization and Compensation Committee reviews and in some cases approves the type and level of cash and equity-based compensation for officers, employees and consultants of the Company, and recommends certain compensation actions to the board of directors for review and approval. The Organization and Compensation Committee:

other outside experts or advisors that it believes to be necessary or appropriate. During 2019,2020, the Organization and Compensation Committee retained Radford, part of the Rewards Solutions practice of Aon plc, a nationally recognized executive compensation consulting firm that performs compensation benchmarking, analysis and design services. Radford was engaged in 20192020 to provide regulatory, legislative updates and market trend analysis, to provide analysis on our compensation programs, to provide recommendations and advice on the structure, elements and amounts of compensation provided to ournon-employee directors, to provide recommendations and advice on Nektar peer companies, to review the Compensation Discussion and Analysis, and to provide executive compensation analysis as needed. Radford provides compensation survey services to the company in addition to the executive and director compensation services it performs at the request of the Organization and Compensation Committee. In 2019,2020, we paid Radford $31,282$12,200 for provision of survey services. After consideration of such services and other factors prescribed by the SEC for purposes of assessing the independence of compensation consultants, we have determined that no conflicts of interest exist between the Company and Radford (or any individuals providing such services to the committee on Radford’s behalf).

The Organization and Compensation Committee may delegate to its subcommittees such authority as it deems appropriate, except for the authority the committee is required to exercise by applicable law or regulation. The Organization and Compensation Committee has delegated certain limited authority to grant stock option awards under our stock incentive plan to a committee comprised of management representatives, and with respect to certain limited authority to grant restricted stock unit awards (RSUs), to a committee of the board of directors, with Mr. Robin serving as the sole member of that committee. These committees may not approve award grants to anyone serving as an executive officer or director of the Company. Other than the authority delegated to these committees, the Organization and Compensation Committee has no current intention to delegate any of its authority to any other committee or subcommittee.

The Nominating and Corporate Governance Committee believes that candidates for director should possess the highest personal and professional ethics, integrity and values, be committed to represent our long-term interests and those of our stockholders, possess diverse experience at policy-making levels in business, science and technology, possess key personal characteristics such as strategic thinking, objectivity, independent judgment, intellect and the courage to speak out and actively participate in meetings, as well as have sufficient time to carry out the duties and responsibilities of a board member effectively.

The current members of the Nominating and Corporate Governance Committee comprise Mr. Whitfield, who chairs the committee, and Messrs. GreerAjer and Lingnau.Greer. The board of directors annually reviews the NASDAQ listing standards definition of independence for the Nominating and Corporate Governance Committee and has determined that all members of our Nominating and Corporate Governance Committee are independent. The Nominating and Corporate Governance Committee charter can be found on our corporate website atwww.nektar.com.

The current members of our board of directors represent a desirable mix of backgrounds, skills and experiences, and are all believed to share the key personal characteristics described above. Below are some of the specific experiences and skills of our directors.

Karin Eastham

Ms. Eastham has held senior executive and finance positions in the biopharmaceutical industry and brings more than 35 years of experience as both an executive and independent director with significant experience in life sciences with particular expertise in both finance and operations. Ms. Eastham currently serves as a director of several other companies. As a result of her extensive experience, she brings strong expertise in finance, accounting, operations management, business development, and corporate governance.

R. Scott Greer

Mr. Greer has a proven track record as an entrepreneur and senior executive with extensive experience in the biotechnology industry, most recently with Abgenix, Inc., until its acquisition by Amgen, Inc. in 2006. Mr. Greer has held senior executive and finance positions at other companies in our industry and currently serves as a director of several other companies in the biopharmaceutical and medical device industries and has served as the Chairman of the Board of several companies. He possesses strong expertise in biotech industry strategy, business models, and finance and has served on compensation, governance and audit committees.

Lutz Lingnau

Mr. Lingnau has a strong management background in the pharmaceutical industry as a senior executive and member of the executive board of Schering AG Group. He has international sales and operations experience as former head of worldwide sales and marketing in the pharmaceutical division of Schering, and in operational roles in South America and the U.S., and also as a member of the supervisory board of a German specialty chemicals company.

The Nominating and Corporate Governance Committee of our board of directors will consider for nomination any qualified director candidates recommended by our stockholders. Any stockholder who wishes to recommend a director candidate is directed to submit in writing the candidate’s name, biographical information, relevant qualifications and other information required by our bylaws to our Secretary at our principal executive offices before the deadline set forth in our bylaws. All written submissions received from our stockholders will be reviewed by the Nominating and Corporate Governance Committee at the next appropriate meeting. The Nominating and Corporate Governance Committee will evaluate any suggested director candidates received from our stockholders in the same manner as recommendations received from management, committee members or members of our board.

STOCKHOLDER COMMUNICATIONSWITHTHE BOARDOF DIRECTORS

The board of directors will consider any written or electronic communication from our stockholders to the board, a committee of the board or any individual director. Any stockholder who wishes to communicate to the board of directors, a committee of the board or any individual director should submit written or electronic communications to our Secretary at our principal executive offices, which shall include contact information for such stockholder. All communications from stockholders received will be forwarded by our Secretary to the

DIRECTOR COMPENSATION TABLE—FISCAL 20192020

Each of ournon-employee directors participates in our Amended and Restated Compensation Plan forNon-Employee Directors (the “Director Plan”). Only ournon-employee directors are eligible to participate in the Director Plan. The following table shows compensation awarded or paid to ournon-employee directors for the fiscal year ended December 31, 2019.2020.