UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

(Date of report) September 5, 2023

(Date of earliest event reported) September 5, 2023

ONE Gas, Inc.

(Exact name of registrant as specified in its charter)

15 East Fifth Street

Tulsa, OK 74103

(Address of principal executive offices) (Zip Code)

Registrant’s Telephone Number, including area code (918) 947-7000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

On September 5, 2023, we issued a news release announcing the election of Angela E. Kouplen to serve as our senior vice president and chief human resources officer, effective September 29, 2023, a copy of which is attached as Exhibit 99.1.

The information disclosed in Item 7.01, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities under that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act except as expressly set forth by specific reference in such filing.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused the report to be signed on its behalf by the undersigned hereunto duly authorized.

EX-99.1

Exhibit 99.1

ONE Gas Announces Angela E. Kouplen Senior Vice President –

Chief Human Resources Officer

TULSA, Okla. – Sept. 5, 2023 – ONE Gas, Inc. (NYSE: OGS) today announced that Angela E. Kouplen will join ONE Gas as senior vice president and chief human resources officer, effective Sept. 29, 2023.

In her role at ONE Gas, Kouplen will oversee all functions of human resources and be a part of the company’s leadership team reporting to Robert S. McAnnally, president and chief executive officer. She brings to the company a diverse background and executive leadership experience having served as an officer of two public companies. Most recently she was vice president of administration and chief information officer at the University of Tulsa. Angela has been an Independent Director for AAON, Inc. (NASDAQ: AAON) since 2016, where she serves as chair of the compensation committee and is a member of the audit committee.

“Angela’s capabilities will strengthen our management team and reinforce our commitment to developing a high-performing workforce through impactful leadership programs, strategic succession planning and targeted recruitment and retention programs,” said McAnnally.

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About ONE Gas, Inc.

ONE Gas, Inc. (NYSE: OGS) is a 100-percent regulated natural gas utility, and trades on the New York Stock Exchange under the symbol “OGS.” ONE Gas is included in the S&P MidCap 400 Index and is one of the largest natural gas utilities in the United States.

ONE Gas Adds New SVP CHRO to Leadership Team

September 2023

Page 2

Headquartered in Tulsa, Oklahoma, ONE Gas provides a reliable and affordable energy choice to more than 2.3 million customers in Kansas, Oklahoma and Texas. Its divisions include Kansas Gas Service, the largest natural gas distributor in Kansas; Oklahoma Natural Gas, the largest in Oklahoma; and Texas Gas Service, the third largest in Texas, in terms of customers.

For more information and the latest news about ONE Gas, visit onegas.com and follow its social channels: @ONEGas, Facebook, LinkedIn and YouTube.

About Angela E. Kouplen

With more than 25 years of leadership and management experience, Angela Kouplen has held a variety of positions in human resources, contracts, facilities management and information technology. Since 2016, she has been an independent director for AAON, where she serves on the compensation and audit committees.

Kouplen most recently served as chief information officer for the University of Tulsa. Before joining TU, she was responsible for human resources, executive compensation, information technology, real estate and facilities for WPX Energy. Prior to that, Kouplen worked in information technology with Williams and CITGO. Her roles have included managing IT planning and governance, third-party applications and applications development, e-business strategy as well as sourcing.

She received a bachelor of science degree in management with a minor in management information systems from Oklahoma State University and an MBA from The University of Tulsa.

Angela has served on a variety of nonprofit boards and committees supporting the Tulsa-area community including YWCA, Resonance Center for Women and the Tulsa Area United Way Women’s Leadership Council. She currently serves on the Tulsa Regional STEM Alliance Board of Directors, Junior Achievement Board of Directors, the OSU Alumni Association Board of Directors and TU’s Collins College of Business Executive Advisory Board. Angela also serves as an Elder at South Point Church in Bixby.