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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)May 26, 2026
(Date of earliest event reported)May 26, 2026

ONE Gas, Inc.
(Exact name of registrant as specified in its charter)
Oklahoma001-3610846-3561936
(State or other jurisdiction(Commission(IRS Employer
of incorporation)File Number)Identification No.)

15 East Fifth Street; Tulsa, OK
(Address of principal executive offices)

74103
(Zip code)

(918) 947-7000
(Registrant’s telephone number, including area code)

Not Applicable
(Former name or former address, if changed since last report)

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:

Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading SymbolName of each exchange on which registered
Common Stock, par value $0.01 per shareOGSNew York Stock Exchange
NYSE Texas

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

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.




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Item 7.01Regulation FD Disclosure
On May 26, 2026, we announced we will participate in the Bank of America Power, Utilities and Cleantech Conference on Wednesday, May 27, 2026, in New York City, New York.

Curtis Dinan, president and chief operating officer, and Christopher Sighinolfi, senior vice president and chief financial officer, will be conducting a series of meetings with members of the investment community.

The materials utilized at the conference are accessible on the ONE Gas website, www.onegas.com/investors/events-and-presentations.

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.
Item 9.01Financial Statements and Exhibits
(d)Exhibits
Exhibit
Number
Description
99.1
104Cover Page Interactive Data File (embedded within the Inline XBRL document).

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SIGNATURE

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

ONE Gas, Inc.
Date:May 26, 2026By:/s/ Christopher P. Sighinolfi
Christopher P. Sighinolfi
Senior Vice President and
Chief Financial Officer

Exhibit 99.1
logoletterheada98.jpg

May 26, 2026Analyst Contact:Erin Dailey
918-947-7411
Media Contact:Leah Harper
918-947-7123

ONE Gas to Participate in Bank of America Power, Utilities and Cleantech Conference

TULSA, Okla. – May 26, 2026 – ONE Gas, Inc. (NYSE: OGS) today announced it will participate in the Bank of America Power, Utilities and Cleantech Conference on Wednesday, May 27, 2026, in New York City, New York.

Curtis Dinan, president and chief operating officer, and Christopher Sighinolfi, senior vice president and chief financial officer, will be conducting a series of meetings with members of the investment community.

The materials utilized at the conference are accessible on the ONE Gas website, www.onegas.com/investors/events-and-presentations.


ONE Gas, Inc. (NYSE: OGS) is a 100-percent regulated natural gas utility, and trades on the New York Stock Exchange and the NYSE Texas 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.

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.

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