UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14A – 101)

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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

Check the appropriate box:

ONE Gas, Inc.

(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):

Annual Meeting of Shareholders

Thursday, May 26, 201625, 2017

MISSION

We deliver natural gas for a better tomorrow.

VISION

To be a premier natural gas distribution company creating exceptional value for our stakeholders.

STRATEGY

Becoming ONE:

CORE VALUES

April 5, 20162017

Dear Shareholder:

You are cordially invited to attend the annual meeting of shareholders of ONE Gas, Inc., which will be held at 9:00 a.m. Central Daylight Time on Thursday, May 26, 2016,25, 2017, at our company headquarters at ONE Gas, Inc., First Place Tower, 15 E. Fifth Street, 2^nd Floor, Tulsa, Oklahoma 74103.

The matters to be considered and voted on at the meeting are set forth in the attached notice of annual meeting of shareholders and are described in the attached proxy statement. A copy of our 20152016 annual report to shareholders is also enclosed. A report on our 20152016 performance will be presented at the meeting.

We look forward to greeting as many of our shareholders as possible at the annual meeting. We know, however, that most of our shareholders will be unable to attend. Therefore, proxies are being solicited so that each shareholder has an opportunity to vote by proxy. You can authorize a proxy over the Internet or by telephone. Instructions for using these convenient services are included in the proxy statement and on the proxy card. Of course, if you prefer, you may vote by mail by signing, dating and returning the enclosed proxy card in the enclosed postage-paid envelope.

If your shares are held by a broker, bank or other holder of record, unless you provide your broker, bank or other holder of record with your instructions on how to vote your shares, your shares will not be voted in the election of directors or in certain other important proposals as described in the accompanying proxy statement. Consequently, please provide your voting instructions to your broker, bank or other holder of record in a timely manner in order to ensure that your shares will be voted.

Regardless of the number of shares you own, your vote is important. I urge you to submit your proxy as soon as possible so that you can be sure your shares will be voted.

Thank you for your investment in ONE Gas and for your continued support.

Very truly yours,

JOHNJohn W. GIBSONGibson

Chairman of the Board

ONE GAS, INC.

NOTICE OF 20162017 ANNUAL MEETING OF SHAREHOLDERS

Time and date: May 26, 2016,25, 2017, at 9:00 a.m. Central Daylight Time

Place: ONE Gas, Inc., First Place Tower, 15 E. Fifth Street, 2^nd Floor, Tulsa, Oklahoma 74103

Items of businessbusiness:

These matters are described more fully in the accompanying proxy statement.

Record date: March 28, 2016.27, 2017. Only shareholders of record at the close of business on the record date are entitled to receive notice of, and to vote at, the annual meeting.

Proxy votingvoting:

YOUR VOTE IS IMPORTANT

The vote of every shareholder is important. The Board appreciates the cooperation of shareholders in directing proxies to vote at the meeting. To make it easier for you to vote, Internet and telephone voting are available. The instructions in the accompanying proxy statement and attached to your proxy card describe how to use these convenient voting methods. Of course, if you prefer, you may vote by mail by completing your proxy card and returning it in the enclosed postage-paid envelope. You may revoke your proxy at any time by following the procedures set forth in the accompanying proxy statement.

Whether or not you expect to attend the meeting in person, we urge you to vote your shares at your earliest convenience. This will ensure the presence of a quorum at the meeting. Voting your shares promptly, via the Internet, by telephone, or by signing, dating and returning the enclosed proxy card will save the expense of additional solicitation. Submitting your proxy now will not prevent you from voting your shares at the meeting, if you desire to do so, as your proxy is revocable at your option.

Important Notice Regarding Internet Availability of Proxy Materials.: This notice of annual meeting, proxy statement, form of proxy and our 20152016 annual report to shareholders are available on our website atwww.ONEGas.com. Additionally, and in accordance with the rules of the Securities and Exchange Commission, you may access this proxy statement and our 20152016 annual report athttp://shareholder.onegas.com, which does not infringe on the anonymity of a person accessing such website. The website does not employ “cookies” or other user-tracking features.

By order of the Board,

Brian K. Shore

Corporate Secretary

Tulsa, Oklahoma

April 5, 20162017

ONE Gas, Inc.

First Place Tower

15 E. Fifth Street

Tulsa, OK 74103

PROXY STATEMENT

This proxy statement describes important issues affecting our company and is furnished in connection with the solicitation of proxies by our Board for use at our 20162017 annual meeting of shareholders to be held at the time and place set forth in the accompanying notice. The approximate date of the mailing of this proxy statement and accompanying proxy card is April 5, 2016.2017.

Unless we otherwise indicate or unless the context indicates otherwise, all references in this proxy statement to “ONE Gas”, “we,” “our,” “us,” the “company” or similar references mean ONE Gas, Inc. and its subsidiary, references to “ONEOK” mean ONEOK, Inc. and its subsidiaries, and references to the “Board” or “Board of Directors” mean the Board of Directors of ONE Gas, Inc.

To assist you in reviewing the company’s 20152016 performance and voting your shares, we would like to call your attention to key elements of our 20162017 proxy statement and our 20152016 annual report to shareholders. The following is only a summary. For more complete information about these topics, please review the complete proxy statement and our 20152016 annual report to shareholders.

PROXY STATEMENT SUMMARY

The following summary provides highlights contained in this proxy statement. You should carefully read and consider the information contained in the proxy statement as this summary does not contain all the information you should consider before voting.

INFORMATION ABOUT THE ANNUAL MEETING OF SHAREHOLDERS

ITEMS OF BUSINESS

RECORD DATE

INTERNET ACCESS TO PROXY MATERIALS

HOW TO VOTE IF YOUR SHARESYOU ARE HELD BY A BROKER OR BANK

PROPOSALS, HOW YOU MAY VOTE AND BOARD RECOMMENDATIONS

Each of the proposals, how you may vote, and how the Board recommends that you vote, is set forth in the following table:

VOTES REQUIRED FOR APPROVALSHAREHOLDER OF THE PROPOSALSRECORD

The votes required for each proposal is summarized below, together with how abstentions and broker non-votes will be treated for each proposal:

DIRECTOR NOMINEES AND CONTINUING DIRECTORS

The following table summarizes information about the two Class II director nominees and the five continuing directors. As noted, five of our seven directors have been determined to be independent in accordance with the New York Stock Exchange (“NYSE”) independence standards and our director independence guidelines.

Director Nominees – Class II

Continuing Directors

Committee memberships/positions key:

BUSINESS HIGHLIGHTS

COMPENSATION HIGHLIGHTS

The compensation of our other NEOs further reflects both our 2015 performance and our pay-for-performance compensation philosophy:

SHAREHOLDER ACTIONS

The following questions and answers are provided for your convenience and briefly address some commonly asked questions about our 2016 annual meeting of shareholders. Please also consult the more detailed information contained elsewhere in this proxy statement and the documents referred to in this proxy statement.

Why did I receive these proxy materials?

We are providing these proxy materials in connection with the solicitation by the Board of ONE Gas, Inc. of proxies to be voted at our 2016 annual meeting of shareholders and at any adjournment or postponement of the meeting. You are invited to attend our annual meeting of shareholders on May 26, 2016, at 9:00 a.m., Central Daylight Time. The meeting will be held at our company headquarters at ONE Gas, Inc., First Place Tower, 15 E. Fifth Street, 2^nd Floor, Tulsa, Oklahoma 74103. For directions to the meeting, please visit our website atwww.ONEGas.com.

Who may attend and vote at the annual meeting?

All shareholders who held shares of our common stock at the close of business on March 28, 2016, may attend and vote at the meeting. If your shares are held in the name of a broker, bank, or other holder of record, often referred to as being held “in street name,” bring a copy of your brokerage account statement or legal proxy, which you may obtain from your broker, bank, or other holder of record of your shares.

Please note: no cameras, recording equipment, large bags, weapons, briefcases or packages will be permitted in the meeting.

Will the annual meeting be webcast?

Our annual meeting also will be webcast on May 26, 2016. You are invited to visitwww.ONEGas.com at 9:00 a.m., Central Daylight Time, on May 26, 2016, to access the webcast of the meeting. Registration for the webcast is required. An archived copy of the webcast will also be available on our website for 30 days following the meeting.

How do I vote?

If you were a shareholder of record at the close of business on the record date of March 28, 2016, you have the right to vote the shares of record you held that day in person at the meeting or you may appoint a proxy through the Internet, by telephone or by mail to vote your shares on your behalf. The Internet and telephone methods of voting generally are available 24 hours a day and will ensure that your proxy is confirmed and posted immediately. These methods of voting are also available to shareholders who hold their shares in our Direct Stock Purchase and Dividend Reinvestment Plan, our Employee Stock Purchase Plan, our 401(k) Plan and our Profit-Sharing Plan. In addition, these voting methods are available to ONEOK employees who own our shares in the ONEOK, Inc. 401(k) Plan or the ONEOK, Inc. Profit-Sharing Plan (referred to collectively as the “ONEOK Plans”). You may revoke your proxy any time before the annual meeting by following the procedures outlined below under the caption “What can I do if I change my mind after I vote my shares by proxy?” Please help us save time and postage costs by appointing a proxy via the Internet or by telephone.

When you appoint a proxy via the Internet, by telephone or by mailing a signed proxy card, you are appointing John W. Gibson, Chairman of the Board and Joseph L. McCormick, Senior Vice President, General Counsel and Assistant Secretary, as your representatives at the annual meeting, and they will vote your shares as you have instructed them. If you appoint a proxy via the Internet, by telephone or by mailing a signed proxy card but do not provide voting instructions, your shares will be voted for the election of each proposed director nominee named herein, andfor proposal numbers 2 and 3.

To appoint a proxy to vote your shares on your behalf, please select from the following options:

Via the Internet

^• Go to the website atwww.proxypush.com/ogs which is available 24 hours a day, 7 days a week, until 11:59 p.m. (Central Daylight Time) on May 24, 2017.

By telephone

^• On a touch-tone telephone, call toll-free 1.866.883.3382, 24 hours a day, 7 days a week, until 11:59 p.m. (Central Daylight Time) on May 24, 2017.

By mail

What if my shares are held by my broker or bank?

^• Date and sign your name exactly as it appears on your proxy card.

^• Mail the proxy card in the enclosed postage-paid envelope.

^•If mailed, your shares are held in a brokerage account or by a bank, broker or its nominee, your shares are consideredcompleted and signed proxy card must be received prior to be held “in street name.” If you held shares “in street name” asthe commencement of voting at the record dateannual meeting.

HOW TO VOTE IF YOUR SHARES ARE HELD BY A BROKER OR BANK

SHAREHOLDER ACTIONS – MATTERS TO BE VOTED UPON

PROPOSALS, HOW YOU MAY VOTE AND BOARD RECOMMENDATIONS

Each of the proposals, how you may vote, and how the Board recommends that you vote, is set forth in the following table:

VOTES REQUIRED FOR APPROVAL OF THE PROPOSALS

The votes required for each proposal is summarized below, together with how abstentions and brokernon-votes will be treated for each proposal:

DIRECTOR NOMINEES AND CONTINUING DIRECTORS

The following table summarizes information about the two Class III director nominees and the five continuing directors. As noted, five of our seven directors have been determined to be independent in accordance with the New York Stock Exchange (“NYSE”) independence standards and our director independence guidelines.

Director Nominees – Class III

Continuing Directors

Committee memberships/positions key:

BUSINESS HIGHLIGHTS

COMPENSATION HIGHLIGHTS

The compensation of our other NEOs further reflects both our 2016 performance and ourpay-for-performance compensation philosophy:

For more than 100 years, our business has delivered natural gas to our customers. We will continue to focus on operating safely and responsibly, while creating shareholder value.

SAFETY AND HEALTH

The safety of our employees, our customers and the communities where we operate is at the forefront of each business decision we make. By monitoring the integrity of our assets and promoting the safety and health of our employees, customers and communities, we are investing in the long-term sustainability of our businesses.

A substantial part of our workforce is comprised of operations specialists who work regularly in the field. We continuously assess the risks our employees face in their jobs, and we work to mitigate those risks through training, appropriate engineering controls, work procedures and other preventive safety and health programs. Reducing incidents and improving our safety incident rates is important, but we are not focused only on statistics. Low incident rates alone cannot prevent a large-scale incident, which is why we continue to focus on enhancing our preventive safety programs, such as near-miss reporting, vehicle-safety monitoring, risk assessment and others.

2016 Safety and Health Performance Updates and Highlights

ENVIRONMENTAL PERFORMANCE

2016 Environmental Updates and Highlights

COMMUNITY INVESTMENT

We are committed to being active members of the communities where we operate. Investing in the areas where we have operations and where our employees live and work is not only the right thing to do–it’s smart business. By contributing financially and through volunteer work, we can help build stronger communities and create a better environment for our employees, our customers and the general public.

We accomplish this in a number of ways, including grants from the ONE Gas Foundation, corporate sponsorships to nonprofit organizations and community volunteer efforts. Primary focus areas for our community investments are education, health and human services, arts and culture, environmental stewardship and community enrichment. We give priority consideration to educational programs and to health and human services organizations, particularly those with programs that help people become self-sufficient.

2016 Community Investment Updates and Highlights

POLITICAL ADVOCACY AND CONTRIBUTIONS

We actively participate in the political process through the lobbying efforts of our government relations department, involvement in multiple business and industry trade organizations, and through the ONE Gas, Inc. Employee Political Action Committee (the “ONE Gas PAC”). In 2016, ONE Gas employees and members of the ONE Gas Board contributed approximately $73,689 to the ONE Gas PAC. During 2016, the ONE Gas PAC contributed approximately $110,900 to candidates for political office and other political action committees.

As a company, we do not contribute corporate funds to political candidates, political action committees orso-called 501(c)(4) social welfare organizations. Employee and director contributions to the ONE Gas PAC are used to support candidates seeking federal or state offices who support the interests of the energy industry and business. A steering committee made up of senior management representatives and a contributions committee made up of employees from across our operating areas oversee all ONE Gas PAC contributions to political candidates.

VOTING

Only shareholders of record at the close of business on March 27, 2017, are entitled to receive notice of and to vote at the annual meeting. As of that date, 52,446,983 shares of our common stock were outstanding. Each outstanding share entitles the holder to one vote on each matter submitted to a vote of shareholders at the meeting. No other class of our stock is entitled to vote on matters to come before the meeting.

Shareholders of record may vote in person or by proxy at the annual meeting. All properly submitted proxies received prior to the commencement of voting at the annual meeting will be voted in accordance with the voting instructions contained on the proxy. Shares for which signed proxies are properly submitted without voting instructions will be voted:

While we know of no other matters that are likely to be brought before the meeting, in the event any other business properly comes before the meeting, proxies will be voted in the discretion of the persons named in the proxy. The persons named as proxies were designated by our Board.

To vote shares held “in street name” through a bank, broker or its nominee, a shareholder must provide voting instructions to his or her bank, broker or its nominee. Brokerage firms, banks and other fiduciaries are required to request voting instructions for shares they hold on behalf of their customers and others. We encourage you to provide instructions to your bank, broker or its nominee on how to vote your shares. If your shares are held “in street name,” to be able to vote those shares in person at the annual meeting, you must obtain a legal proxy, executed in your favor, from the holder of record of those shares as of the close of business on March 27, 2017.

The rules of the NYSE determine whether proposals presented at shareholder meetings are routine ornon-routine. If a proposal is routine, a broker or other entity holding shares for an owner in street name may vote for the proposal without receiving voting instructions from the owner under certain circumstances. If a proposal isnon-routine, the broker or other entity may vote on the proposal only if the owner has provided voting instructions. A “brokernon-vote” occurs when the broker or other entity is unable to vote on a proposal because the proposal isnon-routine and the owner does not provide any voting instructions. Under the rules of the NYSE, Proposals 1, 3 and 4 are considered to benon-routine, and Proposal 2 is considered to be routine. Accordingly, if you do not provide voting instructions to your brokerage firm or other entity holding your shares, your brokerage firm or other entity holding your shares will not be permitted under the rules of the NYSE to vote your shares on Proposals 1, 3 and 4 and will be permitted under the rules of the NYSE to vote your shares on Proposal 2 at its discretion.

Please provide your voting instructions to your broker, bank or other holder of record so that your shares may be voted.

Representatives of our stock transfer agent, Wells Fargo Shareholder Services, a division of Wells Fargo Bank, N.A., will be responsible for tabulating and certifying the votes cast at the annual meeting.

QUORUM

The holders of a majority of the shares entitled to vote at the annual meeting, present in person or by proxy, constitute a quorum for the transaction of business at the annual meeting. In determining whether we have a quorum, we count abstentions and brokernon-votes as present.

If a quorum is not present at the scheduled time of the meeting, the shareholders who are present in person or by proxy may adjourn the meeting until a quorum is present. If the time and place of the adjourned meeting are announced at the time the adjournment is taken, no other notice will be given. However, if the adjournment is for more than 30 days, or if a new record date is set for the adjourned meeting, a notice will be given to each shareholder entitled to receive notice of, and to vote at, the meeting.

MATTERS TO BE VOTED UPON

At the annual meeting, the following matters will be voted upon:

VOTES REQUIRED

Proposal 1—Election of two Class III Directors. Our bylaws provide for majority voting for directors in uncontested elections. We expect that the election of directors at our 2017 annual meeting will be uncontested. Under the majority voting standard, to be elected a nominee must receive a number of “For” votes that exceeds 50 percent of the votes cast with respect to that director’s election. Abstentions and brokernon-votes, if any, do not count as votes cast with respect to the election of directors.

Our corporate governance guidelines require that if an uncontested nominee for director does not receive more “For” than “Against” votes, he or she must promptly tender his or her resignation to our Board. The Board (excluding the director who tendered the resignation) will then evaluate the resignation in light of the best interests of our company and our shareholders in determining whether to accept or reject the resignation, or whether other action should be taken. The Board will announce publicly its decision regarding any tendered resignation.

Proposal 2—Ratification of Selection of PricewaterhouseCoopers LLP as our Independent Registered Public Accounting Firm for the Year ending December 31, 2017. In accordance with our bylaws, approval of this proposal requires the affirmative vote of a majority of the voting power of the shareholders present in person or by proxy and entitled to vote on this proposal at the meeting. Abstentions will have the same effect as votes against this proposal.

Proposal 3—Advisory Vote on Executive Compensation. In accordance with our bylaws, approval of the proposal to approve our executive compensation requires the affirmative vote of a majority of the voting power of the shareholders present in person or by proxy and entitled to vote on this proposal at the meeting. Abstentions will have the same effect as votes against this proposal and brokernon-votes do not count as present and entitled to vote for purposes of determining the outcome of the vote on this proposal. The vote on this proposal is advisory andnon-binding on the company and our Board.

Proposal 4—Approval of the Material Terms of our Annual Officer Incentive Plan for Purposes of Section 162(m) of the Internal Revenue Code. In accordance with our bylaws, approval of the proposal to approve the material terms of our Annual Officer Incentive Plan for purposes of complying with Section 162(m) of the Internal Revenue Code requires the affirmative vote of a majority of the voting power of the shareholders present in person or by proxy and entitled to vote on this proposal at the meeting. Abstentions will have the same effect as votes against this proposal and brokernon-votes do not count as votes cast and have no effect on the vote for purposes of determining the outcome of the vote on this proposal.

REVOKING A PROXY

Any shareholder may revoke his or her proxy at any time before it is voted at the meeting by (1) notifying our corporate secretary in writing (the mailing address of our corporate secretary is Corporate Secretary, ONE Gas, Inc., 15 East Fifth Street, Tulsa, Oklahoma 74103), (2) authorizing a later proxy via the Internet or by telephone, (3) returning a later dated proxy card, or (4) voting at the meeting in person. A shareholder’s presence without voting at the annual meeting will not automatically revoke a previously delivered proxy and any revocation during the meeting will not affect votes previously taken.

If your shares are held in a brokerage account or by a bank or other holder of record, you may revoke any voting instructions you may have previously provided in accordance with the revocation instructions provided by the broker, bank or other holder of record.

PROXY SOLICITATION

Solicitation of proxies will be primarily by mail and telephone. We have engaged Morrow & Co.,Sodali LLC, 470 West Avenue, Stamford, Connecticut 06902, to solicit proxies for a fee of $8,500 plusout-of-pocket expenses. In addition, certain of our officers, directors and employees may solicit proxies on our behalf in person or by mail, telephone, fax or email, for which such persons will receive no additional compensation. We will pay all costs of soliciting proxies. We will also reimburse brokerage firms, banks and other custodians, nominees and fiduciaries for their reasonable expenses for forwarding proxy materials to our shareholders.

Our Board and management are committed to maintaining strong corporate governance practices that allocate rights and responsibilities among our Board, management and our stakeholders in a manner that benefits the long-term interests of our stakeholders. Our corporate governance practices are designed not just to satisfy regulatory and stock exchange requirements but also to provide for effective oversight and management of our company.

Our Corporate Governance Committee engages in a regular process of reviewing our corporate governance practices, including comparing our practices with those recommended by various corporate governance authorities, the expectations of our stakeholders and the practices of other leading public companies. Our Corporate Governance Committee also regularly reviews our corporate governance practices in light of proposed and adopted laws and regulations, including the rules of the Securities and Exchange Commission and the rules and listing standards of the NYSE.

CORPORATE GOVERNANCE GUIDELINES

Our Board has adopted corporate governance guidelines that address key areas of our corporate governance, including: director qualification standards, including the requirement that a majority of our directors be “independent” under the applicable independence requirements of the NYSE; director responsibilities; director access to management; director compensation; management succession; evaluation of the performance of our Board; and the structure and operation of our Board. Our Board periodically reviews our corporate governance guidelines and may revise the guidelines from time to time as conditions warrant. The full text of our corporate governance guidelines is published on and may be printed from our website atwww.ONEGas.com and is also available from our corporate secretary upon request.

CODE OF BUSINESS CONDUCT AND ETHICS

Our Board has adopted a code of business conduct and ethics that applies to our directors, officers (including our principal executive and financial officers, controller and other persons performing similar functions) and all other employees. We require all directors, officers and employees to adhere to our code of business conduct and ethics in addressing the legal and ethical issues encountered in conducting their work for our company. Our code of business conduct and ethics requires that our directors, officers and employees avoid conflicts of interest, comply with all applicable laws and other legal requirements, conduct business in an honest and ethical manner and otherwise act with integrity and in our company’s best interests. All directors, officers and employees are required to report any conduct that they believe to be an actual or apparent violation of our code of business conduct and ethics.

The full text of our code of business conduct and ethics is published on and may be printed from our website atwww.ONEGas.com and is also available from our corporate secretary upon request. We intend to disclose on our website any future amendments to, or waivers from, our code of business conduct and ethics, as required by the rules of the Securities and Exchange Commission and the NYSE.

DIRECTOR INDEPENDENCE

Our corporate governance guidelines provide that a majority of our Board of Directors will be “independent” under the applicable independence requirements of the NYSE. These guidelines and the rules of the NYSE provide that, in qualifying a director as “independent,” the Board must make an affirmative determination that the director has no material relationship with our company, either directly or as a partner, shareholder or officer of an organization that has a relationship with our company. In making this determination with respect to each director serving on the Executive Compensation Committee, under the rules of the NYSE, the Board is required to consider all factors specifically relevant to determine whether the director has a relationship to our company which is material to that director’s ability to be independent from management in connection with the duties of a member of that committee.

Our Board of Directors has also adopted director independence guidelines that specify the types of relationships the Board has determined to be categorically immaterial. Directors who meet these standards are considered to be “independent.” The full text of our director independence guidelines is published on and may be printed from our website atwww.ONEGas.com and is also available from our corporate secretary upon request.

Our Board has determined affirmatively that members Robert E. Evans, Michael G. Hutchinson, Pattye L. Moore, Eduardo A. Rodriguez and Douglas H. Yaeger have no material relationship with our company, and each qualifies as “independent” under our corporate governance guidelines, our director independence guidelines and the rules of the NYSE. In determining whether certain of our directors qualify as “independent” under our director independence guidelines, our Board considered the receipt by certain directors or their immediate family members (or entities of which they are members, directors, partners, executive officers, or counsel) of natural gas service from us at regulated rates on terms generally available to all of our customers (and, in the case of an entity, in an amount that is less than the greater of $1 million or 2 percent of the entity’s gross revenue for its last fiscal year). In each case, the Board determined these relationships to be in the ordinary course of business at regulated rates or on substantially the same terms available tonon-affiliated third parties and to be immaterial in amounts to both our company and the director.

BOARD LEADERSHIP STRUCTURE

During 2015,2016, our Board was led by John W. Gibson, who was the Chairman of the Board, and Eduardo A. Rodriguez, who was both our lead independent director and the Chairmanchair of the Corporate Governance Committee. Pierce H. Norton II is our President and Chief Executive Officer and was a member of our Board. In addition, our Audit Committee and Executive Compensation Committee are each led by a chair and vice chair, each of whom is an independent director.

LEAD INDEPENDENT DIRECTOR

Our corporate governance guidelines vest the lead independent director who, under these guidelines, is also chair of our Corporate Governance Committee, with various key responsibilities. The guidelines provide that the lead independent director shall serve for a term of three to five years as determined by the Board, and that the duties of the lead independent director include but are not limited to:

In addition, the lead independent director has the authority to call meetings of the independent directors and, if requested by major shareholders, will ensure that he or she is available for consultation and direct communication.communication with such shareholders. The Lead Independent Director may also perform duties otherwise assigned to the Chairman of the Board, as set forth above, when the offices of the Chairman of the Board and the Chief Executive Officer are combined.

SUCCESSION PLANNING

A key responsibility of the Chief Executive Officer and the Board is ensuring that an effective process is in place to provide continuity of leadership over the long term at all levels in our company. Each year, succession-planning reviews are held at every significant organizational level of the company, culminating in a full review of senior leadership talent by our independent directors. During this review, the Chief Executive Officer, the Chairman of the Board and the independent directors discuss future candidates for senior leadership positions, succession timing for those positions and development plans for the highest-potential candidates. This process ensures continuity of leadership over the long term, and it forms the basis on which our company makes ongoing leadership assignments. It is a key success factor in managing the long-term planning and investment lead times of our business.

In addition, the Chief Executive Officer maintains in place at all times, and reviews with thenon-management directors, a confidential plan for the timely and efficient transfer of responsibilities in the event of an emergency or sudden incapacitation or departure of the Chief Executive Officer.

RISK OVERSIGHT

We engage in an annual comprehensive enterprise risk-management (“ERM”) process to identify, aggregate, monitor, measure, assess and manage risk. Our ERM approach is designed to enable our Board to establish a mutual understanding with management of the effectiveness of our risk-management practices and capabilities, to review our risk exposure and to elevate certain key risks for discussion at the Board level. Management and our Board believe that risk management is an integral part of our annual strategic planning process, which addresses, among other things, the risks and opportunities facing our company.

Our ERM program is overseen by our Chief Financial Officer. The program is a companywide process designed to identify, aggregate, monitor, measure, assess, and manage risks that could affect our ability to fulfill our business objectives or execute our corporate strategy. Our ERM process involves the identification and assessment of a broad range of risks and the development of plans to mitigate their effects. These risks generally relate to strategic, operational, financial, regulatory compliance and human resources issues.

Not all risks can be dealt with in the same way. Some risks may be easily perceived and controllable, and other risks are unknown; some risks can be avoided or mitigated by particular behavior, and some risks are unavoidable as a practical matter. For some risks, the potential adverse impact would be minor and, as a matter of business judgment, it may not be appropriate to allocate significant resources to avoid the adverse impact. In other cases, the adverse impact could be significant, and it is prudent to expend resources to seek to avoid or mitigate the potential adverse impact. In some cases, a higher degree of risk may be acceptable because of a greater perceived potential for reward. Management is responsible for identifying risks and controls related to our significant business activities; mapping the risks to our corporate strategy; and developing programs and recommendations to determine the sufficiency of risk identification, the balance of potential risk to potential reward and the appropriate manner in which to control and mitigate risk.

The Board implements its risk oversight responsibilities by having management provide periodic briefing and informational sessions on the significant voluntary and involuntary risks that our company faces and how our company is seeking to control and mitigate those risks. In some cases, as with risks relating to significant acquisitions, risk oversight is addressed as part of the full Board’s engagement with the Chief Executive Officer and management.

The Board annually reviews a management assessment of the various operational and regulatory risks facing our company, their relative magnitude and management’s plan for mitigating these risks. The Board also reviews risks related to our company’s business strategy at its annual strategic planning meeting and at other meetings as appropriate.

In certain cases, a Board committee is responsible for oversight of specific risk topics. For example, the Audit Committee oversees risk issues associated with our overall financial reporting and disclosure process and legal compliance, as well as reviewing policies and procedures on risk-control assessment and accounting risk exposure, including our companywide risk control activities. The Audit Committee meets with our executive officers and meets with our Manager—Director–Audit Services, as well as with our independent registered public accounting firm, in separate executive sessions at each of itsin-person meetings during the year, at which time risk issues are discussed regularly.

In addition, our Executive Compensation Committee oversees risks related to our compensation program, as discussed in greater detail elsewhere in this proxy statement, and our Corporate Governance Committee oversees risks related to our governance practices and policies.

BOARD AND COMMITTEE MEMBERSHIP

Our business, property and affairs are managed under the direction of our Board. Members of our Board are kept informed of our business through discussions with our Chief Executive Officer and other officers, by reviewing materials provided to them periodically and in connection with Board and committee meetings, and by participating in meetings of the Board and its committees.

During 2015,2016, the Board held seven regular meetings (fourin-person and three telephonic meetings) and no special meetings. All of our incumbent directors who served on the Board during 20152016 attended at least 75 percentall of the aggregate of all meetings of the Board and Board committees on which they served in 2015.served.

Our corporate governance guidelines provide that members of our Board are expected to attend our annual meeting of shareholders. All members of the Board attended the 20152016 annual meeting of shareholders.

The Board has four standing committees: the Audit Committee, the Executive Compensation Committee, the Corporate Governance Committee and the Executive Committee. The table below provides the current membership of our Board and each of our Board committees. Our Board has determined affirmatively that each member of our Audit Committee, Executive Compensation Committee and Corporate Governance Committee is “independent” under our corporate governance guidelines, our director independence guidelines and the rules of the NYSE.

Our Board has adopted written charters for each of its Audit, Executive Compensation, Corporate Governance and Executive Committees. Copies of the charters of each of these committees are available on and may be printed from our website atwww.ONEGas.com. Copies are also available from our corporate secretary upon request. The responsibilities of our Board committees are summarized below. From time to time the Board, in its discretion, may form other committees.

DIRECTOR NOMINATIONS

Our corporate governance guidelines provide that the Board is responsible for nominating candidates for Board membership and for the delegation of the screening process to the Corporate Governance Committee of the Board. This committee, with recommendations and input from our Chairman of the Board, Chief Executive Officer and the directors, evaluates the qualifications of each director candidate and assesses the appropriate mix of skills, qualifications and characteristics required of Board members in the context of the perceived needs of the Board at a given point in time. The committeeCorporate Governance Committee is responsible for recommending to the full Board candidates for nomination by the Board for election as members of our Board.

Our corporate governance guidelines provide that candidates for nomination by the Board must be committed to devote the time and effort necessary to be productive members of the Board and that, in nominating candidates, the Board will endeavor to establish director diversity in personal background, race, gender, age and nationality. The guidelines also provide that the Board will seek to maintain a mix that includes, but is not limited to, the following areas of core competency: accounting and finance; investment banking; business judgment; management; industry knowledge; crisis response; international business; leadership; strategic vision; law; and corporate relations.

The Corporate Governance Committee’s charter provides that it has the responsibility, in consultation with the Chairman of the Board and Chief Executive Officer, to search for, recruit, screen, interview and select candidates for the position of director as necessary to fill vacancies on the Board or the additional needs of the Board and to consider management and shareholder recommendations for candidates for nomination by the Board. In carrying out this responsibility, the Corporate Governance Committee evaluates the qualifications and performance of incumbent directors and determines whether to recommend them forre-election to the Board. In addition, this committee determines, as necessary, the portfolio of skills, experience, diversity, perspective and background required for the effective functioning of the Board considering our business strategy and our regulatory, geographic and market environments.

Our corporate governance guidelines contain a policy regarding the Corporate Governance Committee’s consideration of prospective director candidates recommended by shareholders for nomination by our Board. Under this policy, and in accordance with our bylaws, any shareholder who wishes to recommend a prospective candidate for nomination by our Board for election at our 20172018 annual meeting should send a letter of recommendation to our corporate secretary at our principal executive offices by no later than December 6, 2016.2017. The letter should include the name, address and number of shares owned by the recommending shareholder (including, if the recommending shareholder is not a shareholder of record, proof of ownership of the type referred to in Rule14a-8(b)(2) of the proxy rules of the Securities and Exchange Commission), the prospective candidate’s name and address, a description of the prospective candidate’s background, qualifications and relationships, if any, with our company and all other information necessary for our Board to determine whether the prospective candidate meets the independence standards under the rules of the NYSE and our director independence guidelines. A signed statement from the prospective candidate should accompany the letter of recommendation indicating that he or she consents to being considered as a nominee of the Board and that, if nominated by the Board and elected by the shareholders, he or she will serve as a director. The committeeCorporate Governance Committee will evaluate prospective candidates recommended by shareholders for nomination by our Board in light of the various factors set forth above.

Neither the Corporate Governance Committee, the Board, nor our company itself discriminates in any way against prospective candidates for nomination by the Board on the basis of age, sex, race, religion, or other personal characteristics. There are no differences in the manner in which the Corporate Governance Committee or the Board evaluates prospective candidates based on whether the prospective candidate is recommended by a shareholder or by the Corporate Governance Committee, provided that the recommending shareholder furnishes to our company a letter of recommendation containing the information described above along with the signed statement of the prospective candidate referred to above.

In addition to having the ability to recommend prospective candidates for nomination by our Board, under our bylaws, shareholders may themselves nominate candidates for election at an annual meeting of shareholders. Any shareholder who desires to nominate candidates for election as directors at our 20172018 annual meeting must follow the procedures set forth in our bylaws. Under these procedures, notice of a shareholder nomination for the election of a director must be received by our corporate secretary at our principal executive offices not less than 120 calendar days before the first anniversary of the date that our proxy statement was released to shareholders in connection with our 20162017 annual meeting of shareholders (i.e., notice must be received no later than December 6, 2016)2017). If the date of the 20172018 annual meeting is more than 30 days from the first anniversary date of the 20162017 meeting, our corporate secretary must receive notice of a shareholder nomination by the close of business on the tenth day following the earlier of (i) the day on which notice of the date of the meeting is mailed to shareholders or (ii) the day on which public announcement of the meeting date is made. In accordance with our bylaws, a shareholder notice must contain certain information about the candidate the shareholder desires to nominate for election as a director, including: (a) the name, age, business address and residence address of such person; (b) the principal occupation or employment of such person; (c) the class or series and number of our shares that are owned beneficially or of record by such person and any affiliates or associates of such person; (d) the name of each nominee holder of our shares owned beneficially but not of record by such person or any affiliates or associates of such person, and the number of our shares held by each such nominee holder; (e) whether and the extent to which any derivative instrument, swap, option, warrant, short interest, hedge or profit interest or other transaction has been entered into by or on behalf of such person, or any affiliates or associates of such person, with respect to our shares; (f) whether and the extent to which any other transaction, agreement, arrangement or understanding (including any short position or any borrowing or lending of our shares) has been made by or on behalf of such person, or any affiliates or associates of such person, the effect or intent of any of the foregoing being to mitigate loss to, or to manage risk or benefit of stock price changes for, such person, or any affiliates or associates of such person, or to increase or decrease the voting power or pecuniary or economic interest of such person, or any affiliates or associates of such person, with respect to our shares; (g) such person’s written and (g)executed representation and agreement (in the form provided by the corporate secretary upon written request) that such person (1) is not and will not become a party to any agreement, arrangement or understanding with, and has not given any commitment or assurance to, any person or entity as to how such person, if elected as a director of the company, will act or vote on any issue or question, (2) is not and will not become a party to any agreement, arrangement or understanding with any person or entity other than the company with respect to any direct or indirect compensation, reimbursement or indemnification in connection with service or action as a director of the company that has not been disclosed to the company in such representation and agreement and (3) in such person’s individual capacity, would be in compliance, if elected as a director of the company, and, if elected as a director, will comply with, all applicable publicly disclosed confidentiality, corporate governance, conflict of interest, Regulation FD, code of conduct and ethics, and stock ownership and trading policies and guidelines of the company; (h) such person’s completed written questionnaire with respect to the background and qualification of such individual and the background of any other person or entity on whose behalf, directly or indirectly, the nomination is being made (which form of questionnaire shall be promptly provided by the corporate secretary to the requesting shareholder upon written request) and (i) all other information relating to such person that would be required to be disclosed in connection with a solicitation of proxies for the election of such person as a director, or would be otherwise required to be disclosed in connection with such solicitation, in each case pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended (including without limitation such person’s written consent to being named in the proxy statement as a nominee and to serving as a director if elected).

In addition, as to the shareholder giving the notice and the beneficial owner, if any, on whose behalf the nomination is made, the notice must set forth: (a) the name and address, as they appear on the company’s books, of such shareholder, and the name and address of such beneficial owner, if any, and any other shareholders known by such shareholder to be supporting such nominee(s); (b) the class and number of our shares that are owned beneficially and of record by such person and any affiliates or associates of such person; (c) the name of each nominee holder of our shares owned beneficially but not of record by such person or any affiliates or associates of such person, and the number of such shares held by each such nominee holder; (d) whether and the extent to which any derivative instrument, swap, option, warrant, short interest, hedge or profit interest or other transaction has been entered into by or on behalf of such person, or any affiliates or associates of such person, with respect to our shares; (e) whether and the extent to which any other transaction, agreement, arrangement or understanding (including any short position or any borrowing or lending of our shares) has been made by or on behalf of such person, or any affiliates or associates of such person, the effect or intent of any of the foregoing being to mitigate loss to, or to manage risk or benefit of stock price changes for, such person, or any affiliates or associates of such person, or to increase or decrease the voting power or pecuniary or economic interest of such person, or any affiliates or associates of such person, with respect to our shares; (f) a representation that the shareholder giving notice intends to appear in person or by proxy at the annual meeting or special meeting to nominate the persons named in its notice; (g) a description of all agreements, arrangements and understandings between such person or any affiliate or associate of such person, and any other person or persons (including their names) in connection with the nomination by such shareholder; and (h) all other information that would be required to be disclosed by such person as a participant in a solicitation of proxies for the election of directors in a contested election, or would be otherwise required to be disclosed in

connection with such solicitation, in each case pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended. This information must be supplemented by such shareholder and beneficial owner, if any, not later than ten (10) days after the record date for the meeting to disclose all such information as of the record date.

At the request of the company, each proposed nominee must submit to the corporate secretary such other information as the company may reasonably require, including such information as may be necessary or appropriate in determining the eligibility of such proposed nominee to serve as an independent director of the company or that could be material to a reasonable shareholder’s understanding of the independence, or lack thereof, of such nominee.

DIRECTOR COMPENSATION

The Executive Compensation Committee’s independent compensation consultant, Meridian, annually advises the Executive Compensation Committee on matters related tonon-management director compensation including competitive market data for the company’s peer group. The Executive Compensation Committee reviews and discusses the director compensation information provided by Meridian and makes a recommendation to the full Board with respect tonon-management director compensation. The Executive Compensation Committee’s philosophy with respect tonon-management director compensation is to target at or below the market median. The components ofnon-management director compensation include an annual cash retainer, additional annual cash retainer for the Chairman of the Board, the chairs of the Audit, Executive Compensation and Corporate Governance Committees and an annual stock retainer. No separate per meeting fees are paid to thenon-management directors. For 2016, based on the market information provided by Meridian, the Executive Compensation Committee recommended and the full Board approved a $5,000 increase in the annual cash retainer, a $5,000 increase in the stock retainer and a $5,000 increase in the retainer for the chair of the Corporate Governance Committee/lead independent director.

During 2015, we began transitioning payment of compensation for each of ournon-management directors for their service on our Board from a calendar year basis to paying on an annual meeting date basis.

In February 2015, we paid2016, eachnon-management director received apro-rata annual cash retainer of $25,929(pro-rata portion of $65,000). The chairs of our Audit and Executive Compensation Committees received an additionalpro-rata annual cash retainer of $5,984(pro-rata portion of $15,000), and our lead independent director, who is also chair of our Corporate Governance Committee, received an additionalpro-rata annual cash retainer of $7,978(pro-rata portion of $20,000). Our Chairman of the Board received an additionalpro-rata annual cash retainer of $29,918(pro-rata portion of $75,000) for his service. The February 2016pro-rata cash payments cover the period from January 1, 2016, to May 25, 2016.

For the period from May 26, 2016, through May 24, 2017, eachnon-management director received an annual cash retainer of $65,000 for the period from January 1 to December 31, 2015.$70,000 and a stock retainer valued at $90,000. The chairs of our Audit and Executive Compensation Committees received an additional annual cash retainer of $15,000, and our lead independent director, who is also chair of our Corporate Governance Committee, received an additional annual cash retainer of $20,000.$25,000. Our Chairman of the Board received an additional annual cash retainer of $75,000 for his service.

On February 23, 2015, each non-management director was granted a stock retainer of 788 shares (valued at $33,640), determined using the average of the high and low trading prices of our company’s common stock on the NYSE on February 23, 2015. This amount represented the pro-rata portion of the full year stock retainer of $85,000 for the period of January 1 to May 20, 2015. On May 21, 2015, each non-management director was granted a stock retainer of 1,946 shares (valued at $85,000), determined using the average of the high and low trading prices of our company’s common stock on the NYSE on May 21, 2015, for the period from May 21, 2015, to May 25, 2016.

In February 2016, each non-management director received a pro-rata annual cash retainer of $25,929. The chairs of our Audit and Executive Compensation Committees received an additional pro-rata annual cash retainer of $5,984, and our lead independent director, who is also chair of our Corporate Governance Committee, received an additional pro-rata annual cash retainer of $7,978. Our Chairman of the Board received an additional pro-rata annual cash retainer of $29,918 for his service. The February 2016 pro-rata cash payments cover the period from January 1, 2016, to May 25, 2016.

For the period from May 26, 2016 through the day before the May 2017 annual meeting, each non-management director will receive an annual cash retainer of $70,000 and a stock retainer valued at $90,000. The chairs of our Audit and Executive Compensation Committees will receive an additional annual cash retainer of $15,000, and our lead independent director, who is also chair of our Corporate Governance Committee, will receive an additional annual cash retainer of $25,000. Our Chairman of the Board will receive an additional annual cash retainer of $75,000 for his service.

All directors are reimbursed for reasonable expenses incurred in connection with attendance at Board and committee meetings.

The Chief Executive Officer, as the sole management director, receives no compensation for his service as a director.

Our Board has established minimum share ownership guidelines for members of our Board. The guidelines provide that within five years after joining the Board, eachnon-management director will own shares of the company’s common stock having a value, at a minimum, of five times the annual cash retainer for service on the Board (excluding annual retainers for service as a chair of a Board committee or for service as Chairman of the Board) as established from time to time by the Board. Shares that count toward this ownership guideline include shares owned outright in the director’s name, shares held in trust for the director’s benefit or the benefit of the director’s immediate family, and phantom shares held in the director’s account under any company deferred compensation plan fornon-employee directors or any similar plan or arrangement. Shares that do not count toward this ownership guideline include unexercised stock options and shares of restricted stock for which restrictions have not yet lapsed (unvested restricted stock). Anon-management director will not be allowed to sell shares of the company’s common stock (using establishedpre-clearance procedures) unless such director’s holdings of the company’s common stock meet the established minimum ownership guideline. Because we became a stand-alone, publicly traded company on January 31, 2014, under the guidelines our directors have five years from this date to satisfy individual share ownership requirements. However, all current directors have satisfied the minimum share ownership guidelines.

The following table sets forth the compensation paid to ournon-management directors in 2015.2016:

Director Compensation