Material Agreement, Financial Obligation (Form 8-K)

On August 11, 2025, ONE Gas, Inc. (the "Company") entered into a credit agreement (the "Credit Agreement") with Bank of America, N.A., as administrative agent, and the lenders party thereto.

The Credit Agreement provides for a $250 million unsecured term loan facility. Proceeds of the loans under the Credit Agreement will be available for working capital, capital expenditures, acquisitions, mergers, and other general corporate purposes. The Credit Agreement matures in September of 2026. The loans under the Credit Agreement will bear interest at a "Term SOFR" or a "Base Rate" as specified in the Credit Agreement, plus a margin specified in the Credit Agreement.

The Credit Agreement contains customary conditions to borrowing, and customary affirmative and negative covenants, including a financial ratio maintenance covenant. The Credit Agreement also contains various customary events of default, the occurrence of which could result in a termination of the lenders' commitments and the acceleration of all of the Company's obligations thereunder.

Some of the lenders under the Credit Agreement and their respective affiliates have, from time to time, performed, and may in the future perform, various financial advisory, commercial and investment banking services for the Company, for which they received or will receive customary fees and expenses. Certain affiliates of the lenders under the Credit Agreement were underwriters of the Company's prior underwritten note and equity issuances and may serve as underwriters of any future note and/or equity issuances. In addition, certain of the lenders under the Credit Agreement and their respective affiliates act as dealers in connection with the Company's commercial paper program, and also as managers, forward purchasers and/or forward sellers, including under the Company's at-the-marketequity program.

The foregoing description of the Credit Agreement is not complete and is subject in all respects to the actual provisions of the Credit Agreement, a copy of which has been filed as Exhibit 10.1 to this Current Report on Form 8-Kand which is incorporated by reference herein.

The information included under Item 1.01 of this Current Report on Form 8-Kis incorporated by reference herein.