| 2026-02-19 | 10-K | 10.29 | 2023 ONE Gas, Inc. Amended and Restated Employee Stock Purchase Plan. |
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| 2026-02-19 | 10-K | 10.23 | 2024 ONE Gas, Inc. Amended and Restated Annual Officer Incentive Plan. |
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| 2026-02-19 | 10-K | 10.18 | Form of 2026 Performance Unit Award Agreement. |
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| 2026-02-19 | 10-K | 10.17 | Form of 2026 Restricted Unit Award Agreement. |
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| 2025-10-30 | 8-K | 10.1 | Third Amended and Restated Credit Agreement, dated as of October 30, 2025, among ONE Gas, Inc., the lenders party thereto from time to time and Bank of America, N.A., as administrative agent. |
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| 2025-08-11 | 8-K | 10.1 | Credit Agreement, dated as of August 11, 2025, among ONE Gas, Inc., the lenders party thereto from time to time and Bank of America, N.A., as administrative agent. |
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| 2025-05-12 | 8-K | 10.1 | Forward Sale Agreement, dated May 8, 2025, between ONE Gas, Inc. and JPMorgan Chase Bank, National Association. |
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| 2025-02-20 | 10-K | 10.15 | Form of 2025 Performance Unit Award Agreement. |
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| 2025-02-20 | 10-K | 10.14 | Form of 2025 Restricted Unit Award Agreement. |
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| 2024-12-27 | 8-K | 10.2 | Amendment dated as of December 27, 2024, to Confirmation of Forward Sale Transaction, dated as of September 15, 2023, between ONE Gas, Inc. and Bank of America, N.A. |
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| 2024-12-27 | 8-K | 10.1 | Amendment dated as of December 27, 2024, to Confirmation of Forward Sale Transaction, dated as of September 11, 2023, between ONE Gas, Inc. and Bank of America, N.A. |
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| 2024-10-15 | 8-K | 10.1 | Lender Joinder and Commitment Increase Agreement, dated as of October 11, 2024, among ONE Gas, Inc., Bank of America, N.A., as administrative agent, swing line lender, and letter of credit issuer, The Huntington National Bank, as lender, and the letter of credit issuers party thereto. |
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| 2024-06-28 | 8-K | 10.1 | Lender Joinder and Commitment Increase Agreement, dated as of June 27, 2024, among ONE Gas, Inc., Bank of America, N.A., as administrative agent, swing line lender, and letter of credit issuer, Regions Bank, as lender, and the letter of credit issuers parties thereto. |
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| 2024-02-22 | 10-K | 10.9 | Form of 2024 Performance Unit Award Agreement. |
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| 2024-02-22 | 10-K | 10.8 | Form of 2024 Restricted Unit Award Agreement. |
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| 2023-12-28 | 8-K | 10.1 | Amendment to Confirmation of Forward Sale Transaction, dated as of December 28, 2023, between ONE Gas, Inc. and Bank of America, N.A. |
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| 2023-10-23 | 8-K | 10.1 | Commitment Increase Agreement, dated as of October 20, 2023, among ONE Gas, Inc., Bank of America, N.A., as administrative agent, swing line lender, and letter of credit issuer, and the other lenders and letter of credit issuers parties thereto. |
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| 2023-09-19 | 8-K | 10.1 | Additional Forward Sale Agreement, dated September 15, 2023, between ONE Gas, Inc. and Bank of America, N.A. |
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| 2023-09-14 | 8-K | 10.1 | Forward Sale Agreement, dated September 11, 2023, between ONE Gas, Inc. and Bank of America, N.A. |
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| 2023-03-16 | 8-K | 10.1 | Extension Agreement, dated as of March 16, 2023, among ONE Gas, Inc., Bank of America, N.A., as administrative agent, swing line lender, and a letter of credit issuer, and the other lenders and letter of credit issuers parties thereto. |
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| 2023-03-13 | 8-K | 10.1 | Confirmation of Forward Sale Transaction, dated as of March 8, 2023, between ONE Gas, Inc. and Bank of America, N.A. |
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| 2023-02-23 | 10-K | 10.11 | Form of 2023 Performance Unit Award Agreement. |
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| 2023-02-23 | 10-K | 10.10 | Form of 2023 Restricted Unit Award Agreement. |
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| 2022-11-18 | 8-K | 10.3 | Administration Agreement between Kansas Gas Service Securitization I, L.L.C. and Kansas Gas Service, a Division of ONE Gas, Inc., as Administrator, dated as of November 18, 2022. |
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| 2022-11-18 | 8-K | 10.2 | Securitized Utility Tariff Property Purchase and Sale Agreement between Kansas Gas Service Securitization I, L.L.C. and Kansas Gas Service, a Division of ONE Gas, Inc., as Seller, dated as of November 18, 2022. |
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| 2022-11-18 | 8-K | 10.1 | Securitized Utility Tariff Property Servicing Agreement between Kansas Gas Service Securitization I, L.L.C. and Kansas Gas Service, a Division of ONE Gas, Inc., as Servicer, dated as of November 18, 2022. |
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| 2022-11-14 | 8-K | 10.3 | Administration Agreement between Kansas Gas Service Securitization I, L.L.C. and Kansas Gas Service, a Division of ONE Gas, Inc., as Administrator, to be dated as of November 18, 2022. |
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| 2022-11-14 | 8-K | 10.2 | Securitized Utility Tariff Property Purchase and Sale Agreement between Kansas Gas Service Securitization I, L.L.C. and Kansas Gas Service, a Division of ONE Gas, Inc., as Seller, to be dated as of November 18, 2022. |
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| 2022-11-14 | 8-K | 10.1 | Securitized Utility Tariff Property Servicing Agreement between Kansas Gas Service Securitization I, L.L.C. and Kansas Gas Service, a Division of ONE Gas, Inc., as Servicer, to be dated as of November 18, 2022. |
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| 2022-11-01 | 10-Q | 10.3 | ONE Gas, Inc. Deferred Compensation Plan for Non-Employee Directors, amended and restated effective July 18, 2022. |
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| 2022-08-26 | 8-K | 10.1 | Securitization Property Purchase and Sale Agreement dated as of August 25, 2022 by and between the Oklahoma Development Finance Authority, as Issuer, and Oklahoma Natural Gas Company, a division of ONE Gas, Inc., as Seller. |
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| 2022-03-17 | 8-K | 10.1 | First Amendment to Second Amended and Restated Credit Agreement, dated as of March 16, 2022, among ONE Gas, Inc., Bank of America, N.A., as administrative agent, swing line lender, and a letter of credit issuer, and the lenders party thereto. |
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| 2022-02-24 | 10-K | 10.33 | Form of 2021 Performance Unit Award Agreement dated September 2021. |
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| 2022-02-24 | 10-K | 10.32 | Form of 2021 Restricted Unit Award Agreement dated September 2021. |
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| 2022-02-24 | 10-K | 10.31 | Form of 2021 Performance Unit Award Agreement dated June 2021. |
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| 2022-02-24 | 10-K | 10.30 | Form of 2021 Restricted Unit Award Agreement dated June 2021. |
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| 2022-02-24 | 10-K | 10.29 | Form of 2022 Performance Unit Award Agreement. |
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| 2022-02-24 | 10-K | 10.28 | Form of 2022 Restricted Unit Award Agreement. |
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| 2021-11-02 | 10-Q | 10.1 | ONE Gas, Inc. Nonqualified Deferred Compensation Plan, as amended and restated effective January 1, 2022. |
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| 2021-03-16 | 8-K | 10.1 | Credit Agreement, dated as of March 16, 2021, among ONE Gas, Inc., the lenders from time to time party thereto and Bank of America, N.A., as administrative agent. |
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| 2021-02-26 | 10-K | 10.30 | OGS JULY 2020 RSU AGREEMENT |
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| 2021-02-26 | 10-K | 10.29 | OGS 2021 PSU AGREEMENT |
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| 2021-02-26 | 10-K | 10.28 | OGS 2021 RSU AGREEMENT |
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| 2021-02-22 | 8-K | 10.1 | Credit Agreement, dated as of February 22, 2021, among ONE Gas, Inc., the lenders from time to time party thereto and Bank of America, N.A., as administrative agent. |
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| 2020-04-07 | 8-K | 10.1 | Credit Agreement, dated as of April 7, 2020, among ONE Gas, Inc., Bank of America, N.A., as administrative agent, and the other lenders party thereto. |
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| 2020-02-20 | 10-K | 10.31 | OGS ANNUAL OFFICER INCENTIVE PLAN |
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| 2020-02-20 | 10-K | 10.21 | OGS 2020 RSU AGREEMENT |
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| 2020-02-20 | 10-K | 10.20 | OGS 2020 PSU AGREEMENT |
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| 2020-02-20 | 10-K | 10.16 | OGS EMPLOYEE STOCK PURCHASE PLAN |
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| 2019-10-04 | 8-K | 10.1 | First Amendment and Extension Agreement, dated as of October 4, 2019, among ONE Gas, Inc., Bank of America, N.A., as administrative agent, swing line lender, a letter of credit issuer and a lender, and the other lenders and letter of credit issuers parties thereto. |
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| 2019-02-20 | 10-K | 10.30 | OGS ANNUAL OFFICER INCENTIVE PLAN |
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| 2019-02-20 | 10-K | 10.19 | OGS 401(K) PLAN |
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| 2019-02-20 | 10-K | 10.13 | OGS 2019 PSU AGREEMENT |
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| 2019-02-20 | 10-K | 10.12 | OGS 2019 RSU AGREEMENT |
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| 2018-10-05 | 8-K | 10.1 | Extension Agreement, dated as of October 5, 2018, among ONE Gas, Inc., Bank of America, N.A., as administrative agent, swing line lender, a letter of credit issuer and a lender, and the other lenders and letter of credit issuers parties thereto. |
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| 2018-02-22 | 10-K | 10.28 | OGS NONQUALIFIED DEFERRED COMP PLAN |
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| 2018-02-22 | 10-K | 10.15 | OGS 2018 PSU AGREEMENT |
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| 2018-02-22 | 10-K | 10.14 | OGS 2018 RSU AGREEMENT |
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| 2018-02-22 | 10-K | 10.11 | OGS EQUITY COMPENSATION PLAN |
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| 2018-02-22 | 10-K | 10.8 | OGS SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN |
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| 2017-10-06 | 8-K | 10.1 | Amended and Restated Credit Agreement, dated as of October 5, 2017, among ONE Gas, Inc., Bank of America, N.A., as administrative agent, swing line lender and a letter of credit issuer, and the other lenders and letter of credit issuers parties thereto. |
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| 2017-02-23 | 10-K | 10.19 | DF COMP PLAN - NON EMPLOYEE DIRECTORS |
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| 2017-02-23 | 10-K | 10.16 | 2017 PSU AGREEMENT |
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| 2017-02-23 | 10-K | 10.15 | 2017 RSU AGREEMENT |
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| 2017-02-23 | 10-K | 10.5 | ANNUAL OFFICER INCENTIVE PLAN |
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| 2016-02-18 | 10-K | 10.25 | FORM OF 2016 RESTICTED UNIT AWARD AGREEMENT |
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| 2016-02-18 | 10-K | 10.24 | FORM OF 2016 PERFORMANCE UNIT AWARD AGREEMENT |
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| 2015-04-30 | 10-Q | 10.3 | FORM OF 2015 RESTRICTED UNIT AWARD AGREEMENT |
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| 2015-04-30 | 10-Q | 10.2 | FORM OF 2015 PERFORMANCE UNIT AWARD AGREEMENT |
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| 2015-02-19 | 10-K | 10.24 | 2015 RESTRICTED UNIT AWARD AGREEMENT |
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| 2015-02-19 | 10-K | 10.23 | 2015 PERFORMANCE UNIT AWARD AGREEMENT |
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| 2014-09-10 | 8-K | 10.1 | FORM OF COMMERCIAL PAPER DEAL AGREEMENT |
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| 2014-02-25 | 10-K | 10.18 | Form of 2012 Performance Unit Award Agreement. |
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| 2014-02-25 | 10-K | 10.17 | Form of 2012 Restricted Unit Award Agreement. |
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| 2014-02-25 | 10-K | 10.16 | Form of 2013 Performance Unit Award Agreement. |
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| 2014-02-25 | 10-K | 10.15 | Form of 2013 Restricted Unit Award Agreement. |
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| 2014-02-25 | 10-K | 10.14 | Form of 2014 Performance Unit Award Agreement. |
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| 2014-02-25 | 10-K | 10.13 | Form of 2014 Restricted Unit Award Agreement. |
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| 2014-02-24 | 8-K | 10.1 | ONE Gas, Inc. Deferred Compensation Plan for Non-Employee Directors |
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| 2014-01-30 | 8-K | 10.3 | Registration Rights Agreement, dated January 27, 2014, by and between ONE Gas, Inc. and Morgan Stanley & Co. LLC, J.P. Morgan Securities LLC and RBS Securities Inc., as representatives of the Initial Purchasers |
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| 2014-01-30 | 8-K | 10.2 | Supplemental Indenture, dated as of January 27, 2014, by and between ONE Gas, Inc. and U.S. Bank National Association, as Trustee |
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| 2014-01-30 | 8-K | 10.1 | Base Indenture, dated as of January 27, 2014, by and between ONE Gas, Inc. and U.S. Bank National Association, as Trustee |
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| 2014-01-15 | 8-K | 10.3 | Employee Matters Agreement, dated January 14, 2014, by and between ONE Gas, Inc. and ONEOK, Inc. |
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| 2014-01-15 | 8-K | 10.2 | Transition Services Agreement, dated January 14, 2014, by and between ONE Gas, Inc. and ONEOK, Inc. |
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| 2014-01-15 | 8-K | 10.1 | Tax Matters Agreement, dated as of January 14, 2014, by and between ONE Gas, Inc. and ONEOK, Inc. |
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