OGS / ONE Gas, Inc. - SEC Filings, Annual Report, Proxy Statement

ONE Gas, Inc.
US ˙ NYSE ˙ US68235P1084

Basic Stats
LEI 549300HXDWI0LATTX840
CIK 1587732
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to ONE Gas, Inc.
SEC Filings (Chronological Order)
This page provides a complete, chronological list of SEC Filings, excluding ownership filings which we provide elsewhere.
August 11, 2025 8-K

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) August 11, 2025 (Date of earliest event reported) August 11, 2025

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) August 11, 2025 (Date of earliest event reported) August 11, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation) (Com

August 11, 2025 EX-10.1

$250,000,000 CREDIT AGREEMENT Dated as of August 11, 2025 ONE GAS, INC., as the Borrower, BANK OF AMERICA, N.A., as Administrative Agent The Other Lenders Party Hereto BOFA SECURITIES, INC., BOKF, NA DBA BANK OF OKLAHOMA, THE HUNTINGTON NATIONAL BANK

EX-10.1 Exhibit 10.1 Execution Version $250,000,000 CREDIT AGREEMENT Dated as of August 11, 2025 among ONE GAS, INC., as the Borrower, BANK OF AMERICA, N.A., as Administrative Agent and The Other Lenders Party Hereto BOFA SECURITIES, INC., BOKF, NA DBA BANK OF OKLAHOMA, THE HUNTINGTON NATIONAL BANK, MIZUHO BANK, LTD, REGIONS CAPITAL MARKETS, RBC CAPITAL MARKETS and TRUIST SECURITIES, INC. Joint Le

August 6, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2025. ☐ Transition Report Pursuant to

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2025. OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number 001-36108 ONE Gas, Inc. (Exac

August 5, 2025 8-K

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) August 5, 2025 (Date of earliest event reported) August 4, 2025 ON

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) August 5, 2025 (Date of earliest event reported) August 4, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employe

August 5, 2025 EX-99.1

ONE Gas Announces Second Quarter 2025 Financial Results; Increases 2025 Financial Guidance Declares Third Quarter Dividend Analyst call and webcast scheduled tomorrow, August 6 at 11 a.m. EDT

Exhibit 99.1 August 5, 2025 Analyst Contact: Will Fiser 918-947-7331 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces Second Quarter 2025 Financial Results; Increases 2025 Financial Guidance Declares Third Quarter Dividend Analyst call and webcast scheduled tomorrow, August 6 at 11 a.m. EDT TULSA, Okla. - Aug 5, 2025 - ONE Gas, Inc. (NYSE: OGS) today announced its second quarter financial

August 5, 2025 EX-3.1

Amended and Restated By-laws of ONE Gas, Inc.

EX-3.1 Exhibit 3.1 AMENDED AND RESTATED BY-LAWS of ONE Gas, Inc. (an Oklahoma corporation) ARTICLE I OFFICES Section 1.01 Principal Office. The principal office for the transaction of the business of ONE Gas, Inc. (the “Corporation”) shall be located at 15 E. 5th St., Tulsa, Oklahoma 74103 (the “Principal Office”). The Corporation’s board of directors (the “Board”) is hereby granted full power and

August 5, 2025 8-K

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) August 5, 2025 (Date of earliest event reported) August 5, 2025 ON

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) August 5, 2025 (Date of earliest event reported) August 5, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employe

August 4, 2025 EX-99.1

ONE Gas Declares Quarterly Dividend

Exhibit 99.1 August 4, 2025 Analyst Contact: Will Fiser 918-947-7331 Media Contact: Leah Harper 918-947-7123 ONE Gas Declares Quarterly Dividend TULSA, Okla. - August 4, 2025 - The board of directors of ONE Gas, Inc. (NYSE: OGS) today declared a quarterly dividend of 67 cents per share of common stock, payable Sep. 3, 2025, to shareholders of record at the close of business Aug. 18, 2025. ONE Gas

August 4, 2025 8-K

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) August 4, 2025 (Date of earliest event reported) August 4, 2025 ON

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) August 4, 2025 (Date of earliest event reported) August 4, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employe

July 2, 2025 8-K

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) July 2, 2025 (Date of earliest event reported) July 2, 2025 ONE Ga

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) July 2, 2025 (Date of earliest event reported) July 2, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer of

July 2, 2025 EX-99.1

ONE Gas Second Quarter 2025 Conference Call and Webcast Scheduled

Exhibit 99.1 July 2, 2025 Analyst Contact: Will Fiser 918-947-7331 Media Contact: Leah Harper 918-947-7123 ONE Gas Second Quarter 2025 Conference Call and Webcast Scheduled TULSA, Okla. – July 2, 2025 – ONE Gas, Inc. (NYSE: OGS) will release its second quarter 2025 financial results after the market closes on Tuesday, August 5, 2025. The ONE Gas executive management team will participate in a conf

July 1, 2025 EX-99.1

ONE Gas Announces Retirement of General Counsel Joseph L. McCormick

EX-99.1 Exhibit 99.1 July 1, 2025 Analyst Contact: Will Fiser 918-947-7331 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces Retirement of General Counsel Joseph L. McCormick TULSA, Okla. – July 1, 2025 – ONE Gas, Inc. (NYSE: OGS) announces the retirement of Joseph L. McCormick as senior vice president, general counsel and assistant corporate secretary, effective October 1, 2025. The ONE G

July 1, 2025 8-K

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) July 1, 2025 (Date of earliest event reported) July 1, 2025 ONE Ga

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) July 1, 2025 (Date of earliest event reported) July 1, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or Other Jurisdiction of Incorporation) (Commissio

June 26, 2025 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 11-K X ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 __ TRANSITION REPORT PURSUANT TO SECTION 15(d

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 11-K X ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period fromto Commission file number 001-36108 A.

June 9, 2025 8-K

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) June 9, 2025 (Date of earliest event reported) June 9, 2025 ONE Ga

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) June 9, 2025 (Date of earliest event reported) June 9, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer of

June 9, 2025 EX-99.1

ONE Gas to Participate in American Gas Association and Jefferies Europe Mini-Forum

Exhibit 99.1 June 9, 2025 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas to Participate in American Gas Association and Jefferies Europe Mini-Forum TULSA, Okla. – June 9, 2025 – ONE Gas, Inc. (NYSE: OGS) today announced it will participate in the American Gas Association and Jefferies Europe Mini-Forum, June 16-17, 2025, in London and Zurich. Robert S. Mc

June 3, 2025 8-K

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) June 3, 2025 (Date of earliest event reported) June 3, 2025 ONE Ga

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) June 3, 2025 (Date of earliest event reported) June 3, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer of

June 3, 2025 EX-99.1

ONE Gas to Participate in Mizuho Mid-Cap Utilities Conference

Exhibit 99.1 June 3, 2025 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas to Participate in Mizuho Mid-Cap Utilities Conference TULSA, Okla. – June 3, 2025 – ONE Gas, Inc. (NYSE: OGS) today announced it will participate in the Mizuho Mid-Cap Utilities Conference on Thursday, June 5, 2025, in New York City, New York. Robert S. McAnnally, president and chief

May 28, 2025 8-K

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 28, 2025 (Date of earliest event reported) May 22, 2025 ONE Ga

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 28, 2025 (Date of earliest event reported) May 22, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation) (Commissio

May 12, 2025 8-K

Current Report

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 12, 2025 (Date of earliest event reported) May 8, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation) (Commission

May 12, 2025 EX-1.1

the forward purchaser (incorporated by reference to Exhibit 1.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on May 12, 2025 (File No. 1-36108)).

Exhibit 1.1 ONE GAS, INC. 2,500,000 Shares Common Stock ($0.01 Par Value) Equity Underwriting Agreement May 8, 2025 J.P. Morgan Securities LLC 383 Madison Avenue New York, New York 10179 Acting in its capacity as Underwriter J.P. Morgan Securities LLC 383 Madison Avenue New York, New York 10179 Acting in its capacity as Forward Seller JPMorgan Chase Bank, National Association 383 Madison Avenue Ne

May 12, 2025 EX-10.1

Forward Sale Agreement, dated May 8, 2025, between ONE Gas, Inc. and JPMorgan Chase Bank, National Association.

Exhibit 10.1 May 8, 2025 To: ONE Gas, Inc. 15 East Fifth Street Tulsa, OK 74103 From: JPMorgan Chase Bank, National Association New York Branch 383 Madison Avenue New York, NY 10179 Dear Sirs, The purpose of this letter agreement (this “Forward Confirmation”) is to confirm the terms and conditions of the transaction entered into between Party A and Party B on the Trade Date specified below (the “T

May 9, 2025 EX-FILING FEES

Calculation of Filing Fee Table (Form Type) ONE Gas, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Table 424(b)(5) (Form Type) ONE Gas, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Share Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee (1) Fees

May 9, 2025 424B5

SUBJECT TO COMPLETION, DATED MAY 8, 2025

Table of Contents Filed pursuant to Rule 424(b)(5) Registration No. 333-269966 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying base prospectus are not an offer to sell these securities and they are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is n

May 9, 2025 424B5

ONE Gas, Inc. 2,500,000 Shares of Common Stock

Table of Contents Filed pursuant to Rule 424(b)(5) Registration No. 333-269966 PROSPECTUS SUPPLEMENT (To Prospectus Dated February 23, 2023) ONE Gas, Inc. 2,500,000 Shares of Common Stock The forward seller referred to below is offering 2,500,000 shares of our common stock, par value $0.01 per share (“common stock”), in this offering. We entered into a forward sale agreement with JPMorgan Chase Ba

May 8, 2025 EX-99.1

###

Exhibit 99.1 May 8, 2025 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas, Inc. Announces Public Offering of 2,500,000 Shares of Common Stock TULSA, Okla. – May 8, 2025 - ONE Gas, Inc. (“ONE Gas”) (NYSE: OGS) announced today that it plans to make a public offering of 2,500,000 shares of its common stock. In connection with the offering, ONE Gas intends to e

May 8, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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 8, 2025 (Date of earliest event reported) May 8, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer of i

May 6, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2025. ☐ Transition Report Pursuant to

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2025. OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number 001-36108 ONE Gas, Inc. (Exa

May 5, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

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 5, 2025 (Date of earliest event reported) May 5, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer of i

May 5, 2025 EX-99.1

ONE Gas Announces First Quarter 2025 Financial Results; Expects to Achieve the Upper Half of 2025 Financial Guidance; Declares Second Quarter Dividend Analyst call and webcast scheduled tomorrow, May 6 at 11 a.m. EST

Exhibit 99.1 May 5, 2025 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces First Quarter 2025 Financial Results; Expects to Achieve the Upper Half of 2025 Financial Guidance; Declares Second Quarter Dividend Analyst call and webcast scheduled tomorrow, May 6 at 11 a.m. EST TULSA, Okla. - May 5, 2025 - ONE Gas, Inc. (NYSE: OGS) today announced its f

May 1, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒        Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definit

April 17, 2025 EX-99.1

ONE Gas to Participate in American Gas Association Financial Forum

Exhibit 99.1 April 17, 2025 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas to Participate in American Gas Association Financial Forum TULSA, Okla. – April 17, 2025 – ONE Gas, Inc. (NYSE: OGS) today announced it will participate in the American Gas Association Financial Forum, May 18-20, 2025, in Marco Island, Florida. Robert S. McAnnally, president and ch

April 17, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) April 17, 2025 (Date of earliest event reported) April 17, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employe

April 8, 2025 EX-99.1

ONE Gas First Quarter 2025 Conference Call and Webcast Scheduled

Exhibit 99.1 April 8, 2025 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas First Quarter 2025 Conference Call and Webcast Scheduled TULSA, Okla. – April 8, 2025 – ONE Gas, Inc. (NYSE: OGS) will release its first quarter 2025 financial results after the market closes on Monday, May 5, 2025. The ONE Gas executive management team will participate in a confere

April 8, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) April 8, 2025 (Date of earliest event reported) April 8, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer

April 2, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒        Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

February 21, 2025 8-K

Financial Statements and Exhibits, Other Events

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) February 21, 2025 (Date of earliest event reported) February 21, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS E

February 21, 2025 EX-99.1

ONE Gas Sets Record Date for 2025 Annual Meeting of Shareholders

Exhibit 99.1 February 21, 2025 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Sets Record Date for 2025 Annual Meeting of Shareholders TULSA, Okla. – Feb. 21, 2025 – ONE Gas, Inc. (NYSE: OGS) will hold its 2025 Annual Meeting of Shareholders as a virtual meeting only on Thursday, May 22, 2025, at 10 a.m. Eastern Daylight Time (9 a.m. Central Daylight Time

February 20, 2025 EX-21.1

Subsidiaries of ONE Gas, Inc.

Exhibit 21.1 SUBSIDIARIES OF ONE Gas, Inc. 1.ONE Gas Properties, L.L.C., an Oklahoma limited liability company. 2.Utility Insurance Company, an Oklahoma company. 3.Kansas Gas Service Securitization I, L.L.C., a Delaware limited liability company.

February 20, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024. ☐ TRANSITION REPORT PURSUANT TO SECT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024. OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number 001-36108 ONE Gas, Inc. (Exact na

February 20, 2025 EX-10.15

Form of 2025 Performance Unit Award Agreement.

Exhibit 10.15 1 ONE GAS, INC. PERFORMANCE UNIT AWARD AGREEMENT This Performance Unit Award Agreement (this “Agreement”) is made and entered into as of February 17, 2025 (the “Grant Date”) by and between ONE Gas, Inc., an Oklahoma corporation (the “Company”) and the “Participant” named below. Participant: #ParticipantName# WHEREAS, the Company has adopted the ONE Gas, Inc. Amended and Restated Equi

February 20, 2025 EX-10.14

Form of 2025 Restricted Unit Award Agreement.

Exhibit 10.14 1 ONE GAS, INC. RESTRICTED UNIT AWARD AGREEMENT This Restricted Unit Award Agreement (this “Agreement”) is made and entered into as of February 17, 2025 (the “Grant Date”) by and between ONE Gas, Inc., an Oklahoma corporation (the “Company”) and the “Participant” named below. Participant: #ParticipantName# WHEREAS, the Company has adopted the ONE Gas, Inc. Amended and Restated Equity

February 20, 2025 EX-19.1

ONE Gas, Inc. Securities/Insider Trading Policy

ONE Gas Securities/Insider Trading Policy 1 Purpose Our employees have a reputation for integrity and high standards for ethical conduct.

February 19, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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) February 19, 2025 (Date of earliest event reported) February 19, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS E

February 19, 2025 EX-99.1

ONE Gas Announces Fourth Quarter and Full Year 2024 Financial Results Analyst call and webcast scheduled tomorrow, Feb. 20 at 11 a.m. EST

Exhibit 99.1 February 19, 2025 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces Fourth Quarter and Full Year 2024 Financial Results Analyst call and webcast scheduled tomorrow, Feb. 20 at 11 a.m. EST TULSA, Okla. - Feb. 19, 2025 - ONE Gas, Inc. (NYSE: OGS) today announced its fourth quarter and full year 2024 financial results, which include dilut

February 14, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) February 14, 2025 (Date of earliest event reported) February 14, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS E

February 14, 2025 EX-99.1

ONE Gas to Participate in UBS, Morgan Stanley, and Jefferies Conferences

Exhibit 99.1 February 14, 2025 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas to Participate in UBS, Morgan Stanley, and Jefferies Conferences TULSA, Okla. – February 14, 2025 – ONE Gas, Inc. (NYSE: OGS) today announced its participation in several upcoming investor conferences. The company will attend the UBS Midwest Utilities Mini-Conference on Wednesda

January 23, 2025 EX-99.1

ONE Gas Fourth Quarter and Year End 2024 Conference Call and Webcast Scheduled Also Announced

Exhibit 99.1 January 23, 2025 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Fourth Quarter and Year End 2024 Conference Call and Webcast Scheduled Schedule for 2025 Earnings News Releases, Conference Calls and Webcasts Also Announced TULSA, Okla. – Jan. 23, 2025 – ONE Gas, Inc. (NYSE: OGS) will release its fourth quarter and full year 2024 financial resu

January 23, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) January 23, 2025 (Date of earliest event reported) January 23, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

January 21, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

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) January 21, 2025 (Date of earliest event reported) January 21, 2025 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

January 21, 2025 EX-99.1

ONE Gas Increases Quarterly Dividend

Exhibit 99.1 January 21, 2025 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Increases Quarterly Dividend TULSA, Okla. - Jan. 21, 2025 - The board of directors of ONE Gas, Inc. (NYSE: OGS) today increased the dividend for the first quarter 2025 by 1 cent per share to 67 cents per share, resulting in an annualized dividend of $2.68 per share. The dividend

December 27, 2024 EX-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.

Exhibit 10.2 December 27, 2024 To: ONE Gas, Inc. 15 East Fifth Street Tulsa, OK 74103 From: Bank of America, N.A. c/o BofA Securities, Inc. Bank of America Tower at One Bryant Park New York, New York 10036 From: BofA Securities, Inc. Bank of America Tower at One Bryant Park New York, New York 10036 Dear Sirs, The purpose of this letter agreement (this “Amendment Agreement”) is to amend the terms a

December 27, 2024 8-K

Current Report

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) December 27, 2024 (Date of earliest event reported) December 27, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation)

December 27, 2024 EX-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.

Exhibit 10.1 December 27, 2024 To: ONE Gas, Inc. 15 East Fifth Street Tulsa, OK 74103 From: Bank of America, N.A. c/o BofA Securities, Inc. Bank of America Tower at One Bryant Park New York, New York 10036 From: BofA Securities, Inc. Bank of America Tower at One Bryant Park New York, New York 10036 Dear Sirs, The purpose of this letter agreement (this “Amendment Agreement”) is to amend the terms a

December 4, 2024 EX-99.1

ONE Gas Issues 2025 Financial Guidance

Exhibit 99.1 December 4, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Issues 2025 Financial Guidance TULSA, Okla. - Dec. 4, 2024 - ONE Gas, Inc. (NYSE: OGS) today issued financial guidance for 2025 and updated its five-year growth rates. “We enter 2025 focused on creating long-term value for our stakeholders, supporting growing customer demand, and

December 4, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) December 4, 2024 (Date of earliest event reported) December 4, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

December 4, 2024 EX-99.2

December 2024 2025 Financial Guidance FORWARD LOOKING STATEMENTS | 2HIGHLIGHTS | 2 71% market share, the largest in Kansas 89% market share, the largest in Oklahoma 13% market share, the third largest in Texas ONE Gas, Inc. (NYSE: OGS) is a 100-perce

December 2024 2025 Financial Guidance FORWARD LOOKING STATEMENTS | 2HIGHLIGHTS | 2 71% market share, the largest in Kansas 89% market share, the largest in Oklahoma 13% market share, the third largest in Texas ONE Gas, Inc.

December 2, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) December 2, 2024 (Date of earliest event reported) December 2, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

December 2, 2024 EX-99.1

ONE Gas to Participate in Jefferies, Mizuho, and Wells Fargo Utility Conferences

Exhibit 99.1 December 2, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas to Participate in Jefferies, Mizuho, and Wells Fargo Utility Conferences TULSA, Okla. – Dec. 2, 2024 – ONE Gas, Inc. (NYSE: OGS) today announced it will participate in the Jefferies Gas Utilities Mini-Conference virtually on Monday, Dec. 9, 2024, followed by the Mizuho Power, Ene

November 8, 2024 SC 13G/A

OGS / ONE Gas, Inc. / AMERICAN CENTURY INVESTMENT MANAGEMENT INC - SC 13G/A Passive Investment

SC 13G/A 1 onegasinc13g-a10.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 10) * ONE GAS, INC. (Name of Issuer) COMMON STOCK (Title of Class of Securities) 68235P108 (CUSIP Number) SEPTEMBER 30, 2024 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designa

November 8, 2024 SC 13G

OGS / ONE Gas, Inc. / WELLINGTON MANAGEMENT GROUP LLP - SEC SCHEDULE 13G Passive Investment

SC 13G 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* ONE Gas, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 68235P108 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designat

November 8, 2024 EX-99

JOINT FILING AGREEMENT

EX-99 2 Rule13DJointFilingAgreement.htm JOINT FILING AGREEMENT JOINT FILING AGREEMENT The undersigned hereby agree that this Schedule 13G (the “Schedule 13G”) with respect to the common stock of ONE Gas, Inc. is, and any additional amendment thereto signed by each of the undersigned shall be, filed on behalf of each undersigned pursuant to and in accordance with the provisions of 13d-1(k) under th

November 5, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2024. ☐ Transition Report Pursuan

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2024. OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number 001-36108 ONE Gas, Inc.

November 4, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

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) November 4, 2024 (Date of earliest event reported) November 4, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

November 4, 2024 EX-99.1

ONE Gas Announces Third Quarter 2024 Financial Results; Increases 2024 Financial Guidance Declares Fourth Quarter Dividend

Exhibit 99.1 November 4, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces Third Quarter 2024 Financial Results; Increases 2024 Financial Guidance Declares Fourth Quarter Dividend TULSA, Okla. - Nov. 4, 2024 - ONE Gas, Inc. (NYSE: OGS) today announced its third quarter financial results, increased the midpoint of its 2024 EPS guidance and decl

October 22, 2024 8-K

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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) October 22, 2024 (Date of earliest event reported) October 21, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation) (C

October 15, 2024 EX-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 parties thereto (incorporated by reference to Exhibit 10.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on October 15, 2024 (File No. 1-36108)).

Exhibit 10.1 LENDER JOINDER AND COMMITMENT INCREASE AGREEMENT (Commitment Increase Pursuant to Section 2.16 of Credit Agreement) This LENDER JOINDER AND COMMITMENT INCREASE AGREEMENT (this “Agreement”) dated as of October 11, 2024 (“Increase Effective Date”) is entered into by and among ONE GAS, INC., an Oklahoma corporation (“Borrower”), BANK OF AMERICA, N.A., as Administrative Agent (in such cap

October 15, 2024 8-K

Entry into a Material Definitive Agreement

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) October 15, 2024 (Date of earliest event reported) October 11, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation) (C

October 1, 2024 EX-99.1

ONE Gas Third Quarter 2024 Conference Call and Webcast Scheduled

Exhibit 99.1 October 1, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Third Quarter 2024 Conference Call and Webcast Scheduled TULSA, Okla. – October 1, 2024 – ONE Gas, Inc. (NYSE: OGS) will release its third quarter 2024 financial results after the market closes on Monday, November 4, 2024. The ONE Gas executive management team will host a conferen

October 1, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) October 1, 2024 (Date of earliest event reported) October 1, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emplo

August 12, 2024 424B5

$250,000,000 ONE Gas, Inc. $250,000,000 5.10% Notes due 2029

424B5 Filed Pursuant to Rule 424(b)(5) Registration No. 333-269966 PROSPECTUS SUPPLEMENT (To Prospectus Dated February 23, 2023) $250,000,000 ONE Gas, Inc. $250,000,000 5.10% Notes due 2029 We are offering $250,000,000 aggregate principal amount of 5.10% Notes due 2029 (the “notes”). The notes will mature on April 1, 2029. The notes will bear interest at a rate of 5.10% per year from, and includin

August 12, 2024 EX-FILING FEES

Calculation of Filing Fee Table FORM S-3 (Form Type) ONE GAS, INC. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

EXHIBIT 107 Calculation of Filing Fee Table FORM S-3 (Form Type) ONE GAS, INC. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities  Security  Type Security Class Title Fee  Calculation  or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Newly Registered Securit

August 12, 2024 EX-4.2

Supplemental Indenture No. 8, dated as of August 12, 2024, between ONE Gas, Inc. and U.S. Bank Trust Company, National Association, as trustee, with respect to the 5.10

Exhibit 4.2 ONE GAS, INC. SUPPLEMENTAL INDENTURE NO. 8 $250,000,000 5.10% Senior Notes due 2029 THIS SUPPLEMENTAL INDENTURE NO. 8, dated as of August 12, 2024 (this “Supplemental Indenture”), between ONE GAS, INC., an Oklahoma corporation (the “Company”), and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (successor in interest to U.S. Bank National Association), a national banking association, as

August 12, 2024 EX-1.1

Underwriting Agreement, dated August 8, 2024, between ONE Gas, Inc., and J.P. Morgan Securities LLC, Mizuho Securities USA LLC and U.S. Bancorp Investments, Inc., as representatives of the several underwriters named therein.

EX-1.1 Exhibit 1.1 ONE GAS, INC. $250,000,000 5.10% Senior Notes due 2029 Underwriting Agreement August 8, 2024 J.P. Morgan Securities LLC 383 Madison Avenue New York, New York 10179 Mizuho Securities USA LLC 1271 Avenue of the Americas New York, New York 10020 U.S. Bancorp Investments, Inc. 214 North Tryon Street, 26th Floor Charlotte, North Carolina 28202 As Representatives of the several Underw

August 12, 2024 8-K

Entry into a Material Definitive Agreement

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) August 12, 2024 (Date of earliest event reported) August 8, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation) (Comm

August 8, 2024 FWP

ONE GAS, INC. Pricing Term Sheet Issuer: ONE Gas, Inc. Ratings*: A3 (stable) / A- (stable) (Moody’s / S&P) Legal Format: SEC Registered Pricing Date: August 8, 2024 Settlement Date**: August 12, 2024 (T+2) Security Type: 5.10% Senior Notes due 2029 (

Filed Pursuant to Rule 433 Registration Statement No. 333-269966 Pricing Term Sheet ONE GAS, INC. Pricing Term Sheet Issuer: ONE Gas, Inc. Ratings*: A3 (stable) / A- (stable) (Moody’s / S&P) Legal Format: SEC Registered Pricing Date: August 8, 2024 Settlement Date**: August 12, 2024 (T+2) Security Type: 5.10% Senior Notes due 2029 (the “Notes”) Size: $250,000,000 (Reopening of 5.10% Senior Notes d

August 8, 2024 424B5

SUBJECT TO COMPLETION, DATED AUGUST 8, 2024

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-269966 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying base prospectus are not an offer to sell these securities and they are not soliciting an offer to buy these securities in any jurisdiction where the offer or sal

August 6, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2024. ☐ Transition Report Pursuant to

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2024. OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number 001-36108 ONE Gas, Inc. (Exac

August 5, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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) August 5, 2024 (Date of earliest event reported) August 5, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employe

August 5, 2024 EX-99.1

ONE Gas Announces Second Quarter 2024 Financial Results; Reaffirms 2024 Financial Guidance

Exhibit 99.1 August 5, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces Second Quarter 2024 Financial Results; Reaffirms 2024 Financial Guidance TULSA, Okla. - Aug. 5, 2024 - ONE Gas, Inc. (NYSE: OGS) today announced its second quarter financial results and reaffirmed its 2024 financial guidance. “The first half of 2024 was in line with our e

July 30, 2024 8-K

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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) July 30, 2024 (Date of earliest event reported) July 25, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation) (Commiss

July 15, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

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) July 15, 2024 (Date of earliest event reported) July 15, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer

July 15, 2024 EX-99.1

ONE Gas Declares Quarterly Dividend

Exhibit 99.1 July 15, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Declares Quarterly Dividend TULSA, Okla. - July 15, 2024 - The board of directors of ONE Gas, Inc. (NYSE: OGS) today declared a quarterly dividend of 66 cents per share of common stock, payable Aug. 30, 2024, to shareholders of record at the close of business Aug. 14, 2024. ONE Gas

July 9, 2024 8-K

Current Report

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) July 9 2024 (Date of earliest event reported) July 2, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation) (Commission

July 9, 2024 EX-99.1

ONE Gas Adds Two Additional Board Members

Exhibit 99.1 July 3, 2024 Analyst Contact: Erin Dailey           918-947-7411 Media Contact: Leah Harper         918-947-7123 ONE Gas Adds Two Additional Board Members TULSA, Okla. – July 3, 2024 – The board of directors of ONE Gas, Inc. (NYSE: OGS) has appointed Yves C. Siegel, CFA, and Sanjay D. Meshri to its board, effective July 2, 2024, bringing the total number of members to nine. “It is a p

July 2, 2024 EX-99.1

ONE Gas Second Quarter 2024 Conference Call and Webcast Scheduled

Exhibit 99.1 July 2, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Second Quarter 2024 Conference Call and Webcast Scheduled TULSA, Okla. – July 2, 2024 – ONE Gas, Inc. (NYSE: OGS) will release its second quarter 2024 financial results after the market closes on Monday, August 5, 2024. The ONE Gas executive management team will host a conference cal

July 2, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) July 2, 2024 (Date of earliest event reported) July 2, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer of

June 28, 2024 8-K

Entry into a Material Definitive Agreement

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) June 28, 2024 (Date of earliest event reported) June 27, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation) (Commiss

June 28, 2024 EX-10.1

Lender Joinder and Commitment 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 (incorporated by reference to Exhibit 10.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on June 28, 2024 (File No. 1-36108)).

Exhibit 10.1 LENDER JOINDER AND COMMITMENT INCREASE AGREEMENT (Commitment Increase Pursuant to Section 2.16 of Credit Agreement) This JOINDER AND COMMITMENT INCREASE AGREEMENT (this “Agreement”) dated as of June 27, 2024 (“Increase Effective Date”) is entered into by and among ONE GAS, INC., an Oklahoma corporation (“Borrower”), BANK OF AMERICA, N.A., as Administrative Agent (in such capacity, “Ad

June 21, 2024 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 11-K X ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 __ TRANSITION REPORT PURSUANT TO SECTION 15(d

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 11-K X ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period fromto Commission file number 001-36108 A.

May 31, 2024 EX-99.1

ONE Gas to Participate in Mizuho Mid-Cap Utilities Conference

Exhibit 99.1 May 31, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas to Participate in Mizuho Mid-Cap Utilities Conference TULSA, Okla. – May 31, 2024 – ONE Gas, Inc. (NYSE: OGS) today announced it will participate in the Mizuho Mid-Cap Utilities Conference on Monday, June 3, 2024, in New York City, New York. Robert S. McAnnally, president and chief e

May 31, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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 31, 2024 (Date of earliest event reported) May 31, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer of

May 29, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Submission of Matters to a Vote of Security Holders

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 29, 2024 (Date of earliest event reported) May 23, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer of

May 7, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2024. ☐ Transition Report Pursuant to

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2024. OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number 001-36108 ONE Gas, Inc. (Exa

May 6, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

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 6, 2024 (Date of earliest event reported) May 6, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer of i

May 6, 2024 EX-99.1

ONE Gas Announces First Quarter 2024 Financial Results; Affirms 2024 Financial Guidance Declares Second Quarter Dividend

Exhibit 99.1 May 6, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces First Quarter 2024 Financial Results; Affirms 2024 Financial Guidance Declares Second Quarter Dividend TULSA, Okla. - May 6, 2024 - ONE Gas, Inc. (NYSE: OGS) today announced its first quarter financial results, affirmed its 2024 financial guidance and declared its quarterly

May 1, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒        Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Prox

April 15, 2024 EX-99.1

ONE Gas to Participate in American Gas Association Financial Forum

Exhibit 99.1 April 15, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas to Participate in American Gas Association Financial Forum TULSA, Okla. – April 15, 2024 – ONE Gas, Inc. (NYSE: OGS) today announced it will participate in the American Gas Association Financial Forum on Sunday and Monday, May 19-20, 2024, in Palm Desert, California. Robert S. McAn

April 15, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) April 15, 2024 (Date of earliest event reported) April 15, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employe

April 9, 2024 EX-99.1

ONE Gas First Quarter 2024 Conference Call and Webcast Scheduled

Exhibit 99.1 April 9, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas First Quarter 2024 Conference Call and Webcast Scheduled TULSA, Okla. – April 9, 2024 – ONE Gas, Inc. (NYSE: OGS) will release its first quarter 2024 financial results after the market closes on Monday, May 6, 2024. The ONE Gas executive management team will host a conference call t

April 9, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) April 9, 2024 (Date of earliest event reported) April 9, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer

April 3, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒        Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

March 1, 2024 EX-99.1

ONE Gas to Participate in Morgan Stanley and BofA Energy and Power Conferences

Exhibit 99.1 March 1, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas to Participate in Morgan Stanley and BofA Energy and Power Conferences TULSA, Okla. – March 1, 2024 – ONE Gas, Inc. (NYSE: OGS) today announced it will participate in the BofA Securities Power, Utilities and Clean Energy Conference on Monday, March 4, 2024, in New York City, New Yor

March 1, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) March 1, 2024 (Date of earliest event reported) March 1, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer

March 1, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

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) March 1, 2024 (Date of earliest event reported) March 1, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer

March 1, 2024 EX-99.1

Kansas Gas Service Prioritizes Safety and Reliability in Rate Review Request

Exhibit 99.1 March 1, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Dawn Tripp 913-660-4679 Kansas Gas Service Prioritizes Safety and Reliability in Rate Review Request OVERLAND PARK, Kan. – March 1, 2024 – Kansas Gas Service, a division of ONE Gas, Inc., announced today that it has filed a request with the Kansas Corporation Commission (KCC) to increase its rates to recover the in

February 23, 2024 8-K

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) February 23, 2024 (Date of earliest event reported) February 23, 2

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) February 23, 2024 (Date of earliest event reported) February 23, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS E

February 23, 2024 EX-99.1

ONE Gas Sets Record Date for 2024 Annual Meeting of Shareholders

Exhibit 99.1 February 23, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Sets Record Date for 2024 Annual Meeting of Shareholders TULSA, Okla. – Feb. 23, 2024 – ONE Gas, Inc. (NYSE: OGS) will hold its 2024 Annual Meeting of Shareholders as a virtual meeting only on Thursday, May 23, 2024, at 10 a.m. Eastern Daylight Time (9 a.m. Central Daylight Time

February 22, 2024 EX-10.8

Form of 2024 Restricted Unit Award Agreement (incorporated by reference to Exhibit 10.8 to ONE Gas, Inc.’s Annual Report on Form 10-K filed on February 22, 2024 (File No. 1-36108)).

ONE GAS, INC. RESTRICTED UNIT AWARD AGREEMENT This Restricted Unit Award Agreement (this “Agreement”) is made and entered into as of February 19, 2024 (the “Grant Date”) by and between ONE Gas, Inc., an Oklahoma corporation (the “Company”) and the “Participant” named below. Participant: #ParticipantName# WHEREAS, the Company has adopted the ONE Gas, Inc. Amended and Restated Equity Compensation Pl

February 22, 2024 EX-21.1

Subsidiaries of ONE Gas, Inc.

Exhibit 21.1 SUBSIDIARIES OF ONE Gas, Inc. 1.ONE Gas Properties, L.L.C., an Oklahoma limited liability company. 2.Utility Insurance Company, an Oklahoma company. 3.Kansas Gas Service Securitization I, L.L.C., a Delaware limited liability company.

February 22, 2024 EX-97.1

ONE Gas, Inc. Supplemental Clawback Policy

ONE GAS, INC. SUPPLEMENTAL CLAWBACK POLICY The Executive Compensation Committee (the “Committee”) of the Board of Directors (the “Board”) of ONE Gas, Inc. (the “Company”) believes that it is appropriate for the Company to adopt this Supplemental Clawback Policy (the “Policy”) to be applied to the Executive Officers of the Company and adopts this Policy to be effective as of the Effective Date. 1.

February 22, 2024 EX-10.9

Form of 2024 Performance Unit Award Agreement ((incorporated by reference to Exhibit 10.9 to ONE Gas, Inc.’s Annual Report on Form 10-K filed on February 22, 2024 (File No. 1-36108)).

ONE GAS, INC. PERFORMANCE UNIT AWARD AGREEMENT This Performance Unit Award Agreement (this “Agreement”) is made and entered into as of February 19, 2024 (the “Grant Date”) by and between ONE Gas, Inc., an Oklahoma corporation (the “Company”) and the “Participant” named below. Participant: #ParticipantName# WHEREAS, the Company has adopted the ONE Gas, Inc. Amended and Restated Equity Compensation

February 22, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023. ☐ TRANSITION REPORT PURSUANT TO SECT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023. OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number 001-36108 ONE Gas, Inc. (Exact na

February 21, 2024 EX-99.1

ONE Gas Announces Fourth Quarter and Full Year 2023 Financial Results Analysts' call and webcast scheduled tomorrow, Feb. 22 at 11 a.m. EST

Exhibit 99.1 February 21, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces Fourth Quarter and Full Year 2023 Financial Results Analysts' call and webcast scheduled tomorrow, Feb. 22 at 11 a.m. EST TULSA, Okla. - Feb. 21, 2024 - ONE Gas, Inc. (NYSE: OGS) today announced its fourth quarter and full year 2023 financial results, which included di

February 21, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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) February 21, 2024 (Date of earliest event reported) February 21, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS E

February 13, 2024 SC 13G/A

OGS / ONE Gas, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01611-onegasinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)* Name of issuer: ONE Gas Inc Title of Class of Securities: Common Stock CUSIP Number: 68235P108 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pu

February 12, 2024 SC 13G/A

OGS / ONE Gas, Inc. / AMERICAN CENTURY INVESTMENT MANAGEMENT INC - SC 13G/A Passive Investment

SC 13G/A 1 onegasinc13g-a9.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 9) * ONE GAS, INC. (Name of Issuer) COMMON STOCK (Title of Class of Securities) 68235P108 (CUSIP Number) DECEMBER 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate

January 25, 2024 EX-99.1

ONE Gas Fourth Quarter and Year End 2023 Conference Call and Webcast Scheduled Also Announced

Exhibit 99.1 January 25, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Fourth Quarter and Year End 2023 Conference Call and Webcast Scheduled Schedule for 2024 Earnings News Releases, Conference Calls and Webcasts Also Announced TULSA, Okla. – Jan. 25, 2024 – ONE Gas, Inc. (NYSE: OGS) will release its fourth quarter and full year 2023 financial resu

January 25, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) January 25, 2024 (Date of earliest event reported) January 25, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

January 23, 2024 EX-99.1

ONE Gas Increases Quarterly Dividend; Narrows 2023 Financial Guidance

Exhibit 99.1 January 23, 2024 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Increases Quarterly Dividend; Narrows 2023 Financial Guidance TULSA, Okla. - Jan. 23, 2024 - The board of directors of ONE Gas, Inc. (NYSE: OGS) today increased the dividend for the first quarter 2024 by 1 cent per share to 66 cents per share, resulting in an annualized dividend

January 23, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

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) January 23, 2024 (Date of earliest event reported) January 23, 2024 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

December 28, 2023 EX-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.

Exhibit 10.1 December 28, 2023 To: ONE Gas, Inc. 15 East Fifth Street Tulsa, OK 74103 From: Bank of America, N.A. c/o BofA Securities, Inc. Bank of America Tower at One Bryant Park New York, New York 10036 From: BofA Securities, Inc. Bank of America Tower at One Bryant Park New York, New York 10036 Dear Sirs, The purpose of this letter agreement (this “Amendment Agreement”) is to amend the terms a

December 28, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

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) December 28, 2023 (Date of earliest event reported) December 28, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation)

December 13, 2023 EX-1.1

Underwriting Agreement, dated December 11, 2023, between ONE Gas, Inc., and J.P. Morgan Securities LLC, Mizuho Securities USA LLC and U.S. Bancorp Investments, Inc., as representatives of the several underwriters named therein.

Exhibit 1.1 ONE GAS, INC. $300,000,000 5.10% Senior Notes due 2029 Underwriting Agreement December 11, 2023 J.P. Morgan Securities LLC 383 Madison Avenue New York, New York 10179 Mizuho Securities USA LLC 1271 Avenue of the Americas New York, New York 10020 U.S. Bancorp Investments, Inc. 214 North Tryon Street, 26th Floor Charlotte, North Carolina 28202 As Representatives of the several Underwrite

December 13, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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) December 13, 2023 (Date of earliest event reported) December 11, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation)

December 13, 2023 EX-4.2

Supplemental Indenture No. 7, dated as of December 13, 2023, between ONE Gas, Inc. and U.S. Bank Trust Company, National Association, as trustee, with respect to the 5.10% Notes due 2029 (incorporated by reference to Exhibit 4.2 of ONE Gas Inc.’s Current Report on Form 8-K filed on December 13, 2023 (File No. 1-36108)).

Exhibit 4.2 ONE GAS, INC. SUPPLEMENTAL INDENTURE NO. 7 $300,000,000 5.10% Senior Notes due 2029 THIS SUPPLEMENTAL INDENTURE NO. 7, dated as of December 13, 2023 (this “Supplemental Indenture”), between ONE GAS, INC., an Oklahoma corporation (the “Company”), and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (successor in interest to U.S. Bank National Association), a national banking association, a

December 12, 2023 424B5

$300,000,000 ONE Gas, Inc. $300,000,000 5.10% Notes due 2029

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-269966 PROSPECTUS SUPPLEMENT (To Prospectus Dated February 23, 2023) $300,000,000 ONE Gas, Inc. $300,000,000 5.10% Notes due 2029 We are offering $300,000,000 aggregate principal amount of 5.10% Notes due 2029 (the “notes”). The notes will mature on April 1, 2029. The notes will bear interest at a rate of 5.10% per year from,

December 12, 2023 EX-FILING FEES

Calculation of Filing Fee Table (Form Type) ONE GAS, INC. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed

EXHIBIT 107 Calculation of Filing Fee Table 424(b)(5) (Form Type) ONE GAS, INC. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Newly Registered Securities

December 11, 2023 FWP

ONE GAS, INC. Pricing Term Sheet Issuer: ONE Gas, Inc. Ratings*: A3 (stable) / A- (stable) (Moody’s / S&P) Legal Format: SEC Registered Pricing Date: December 11, 2023 Settlement Date: December 13, 2023 (T+2) Security Type: 5.10% Senior Notes due 202

Filed Pursuant to Rule 433 Registration Statement No. 333-269966 Pricing Term Sheet ONE GAS, INC. Pricing Term Sheet Issuer: ONE Gas, Inc. Ratings*: A3 (stable) / A- (stable) (Moody’s / S&P) Legal Format: SEC Registered Pricing Date: December 11, 2023 Settlement Date: December 13, 2023 (T+2) Security Type: 5.10% Senior Notes due 2029 (the “Notes”) Size: $300,000,000 Maturity Date: April 1, 2029 Be

December 11, 2023 424B5

SUBJECT TO COMPLETION, DATED DECEMBER 11, 2023

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-269966 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying base prospectus are not an offer to sell these securities and they are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is n

December 1, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) December 1, 2023 (Date of earliest event reported) December 1, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

December 1, 2023 EX-99.1

ONE Gas to Participate in BofA, Mizuho, and Wells Fargo Utility Conferences

Exhibit 99.1 December 1, 2023 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas to Participate in BofA, Mizuho, and Wells Fargo Utility Conferences TULSA, Okla. – Dec. 1, 2023 – ONE Gas, Inc. (NYSE: OGS) today announced it will participate in the BofA Securities Gas Utility Conference virtually on Monday, Dec. 4, 2023, followed by the Mizuho Power, Energy, &

November 29, 2023 EX-99.1

ONE Gas Issues 2024 Financial Guidance

Exhibit 99.1 November 29, 2023 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Issues 2024 Financial Guidance TULSA, Okla. - Nov. 29, 2023 - ONE Gas, Inc. (NYSE: OGS) today issued financial guidance for 2024. “As we look to 2024, we remain focused on executing our business strategy, anchored by system reinforcements and a continued expansion of core capabi

November 29, 2023 EX-99.2

November 2023 2024 FINANCIAL GUIDANCE Delivering Reliable & Affordable Energy FORWARD LOOKING STATEMENTS | 2FORWARD LOOKING STATEMENTS | 2 Investor Information Contact Information and forward-looking statements Statements contained in this presentati

November 2023 2024 FINANCIAL GUIDANCE Delivering Reliable & Affordable Energy FORWARD LOOKING STATEMENTS | 2FORWARD LOOKING STATEMENTS | 2 Investor Information Contact Information and forward-looking statements Statements contained in this presentation that include or refer to Company expectations, our business outlook, our future plans or predictions relating to any matters should be considered forward-looking statements that are covered by the safe harbor provisions of the Private Securities Litigation Reform Act of 1995, the Securities Act of 1933 and the Securities and Exchange Act of 1934, each as amended.

November 29, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) November 29, 2023 (Date of earliest event reported) November 29, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS E

November 27, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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) November 27, 2023 (Date of earliest event reported) November 20, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation)

November 16, 2023 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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) November 16, 2023 (Date of earliest event reported) November 14, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or Other Jurisdiction of Incorporation)

November 16, 2023 EX-99.1

CONFIDENTIAL ONE Gas Announces the Retirement of Chief Financial Officer and Names Successor

Exhibit 99.1 ONE Gas Announces CFO Retirement and Successor November 2023 Page 1 CONFIDENTIAL Nov. 16, 2023 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces the Retirement of Chief Financial Officer and Names Successor TULSA, Okla. – Nov. 16, 2023 – ONE Gas, Inc. (NYSE: OGS) today announced that after a 25-year career in finance and executive lead

October 31, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2023. ☐ Transition Report Pursuan

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2023. OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number 001-36108 ONE Gas, Inc.

October 30, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

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) October 30, 2023 (Date of earliest event reported) October 30, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

October 30, 2023 EX-99.1

ONE Gas Announces Third Quarter 2023 Financial Results; Narrows 2023 Earnings Guidance Declares Fourth Quarter Dividend

Exhibit 99.1 October 30, 2023 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces Third Quarter 2023 Financial Results; Narrows 2023 Earnings Guidance Declares Fourth Quarter Dividend TULSA, Okla. - Oct. 30, 2023 - ONE Gas, Inc. (NYSE: OGS) today announced its third quarter financial results, narrowed its 2023 earnings guidance and declared its quart

October 23, 2023 8-K

Entry into a Material Definitive Agreement

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) October 23, 2023 (Date of earliest event reported) October 20, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation) (C

October 23, 2023 EX-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 (incorporated by reference to Exhibit 10.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on October 23, 2023 (File No. 1-36108)).

Exhibit 10.1 COMMITMENT INCREASE AGREEMENT (Commitment Increase Pursuant to Section 2.16 of Credit Agreement) This COMMITMENT INCREASE AGREEMENT (this “Agreement”) dated as of October 20, 2023 (“Increase Effective Date”) is entered into by and among ONE GAS, INC., an Oklahoma corporation (“Borrower”), BANK OF AMERICA, N.A., as Administrative Agent (in such capacity, “Administrative Agent”), Swing

October 3, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) October 3, 2023 (Date of earliest event reported) October 3, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emplo

October 3, 2023 EX-99.1

ONE Gas Third Quarter 2023 Conference Call and Webcast Scheduled

Exhibit 99.1 October 3, 2023 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Third Quarter 2023 Conference Call and Webcast Scheduled TULSA, Okla. – October 3, 2023 – ONE Gas, Inc. (NYSE: OGS) will release its third quarter 2023 financial results after the market closes on Monday, October 30, 2023. The ONE Gas executive management team will host a conferen

September 19, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

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 19, 2023 (Date of earliest event reported) September 15, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation

September 19, 2023 EX-10.1

Additional Forward Sale Agreement, dated September 15, 2023, among ONE Gas, Inc. and Bank of America, N.A. (incorporated by reference to Exhibit 10.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on September 19, 2023 (File No. 1-36108)).

Exhibit 10.1 September 15, 2023 To: ONE Gas, Inc. 15 East Fifth Street Tulsa, OK 74103 From: Bank of America, N.A. c/o BofA Securities, Inc. Bank of America Tower at One Bryant Park New York, New York 10036 From: BofA Securities, Inc. Bank of America Tower at One Bryant Park New York, New York 10036 Dear Sirs, The purpose of this letter agreement (this “Forward Confirmation”) is to confirm the ter

September 14, 2023 EX-10.1

Forward Sale Agreement, dated September 11, 2023, among ONE Gas, Inc. and Bank of America, N.A. (incorporated by reference to Exhibit 10.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on September 14, 2023 (File No. 1-36108)).

Exhibit 10.1 September 11, 2023 To: ONE Gas, Inc. 15 East Fifth Street Tulsa, OK 74103 From: Bank of America, N.A. c/o BofA Securities, Inc. Bank of America Tower at One Bryant Park New York, New York 10036 From: BofA Securities, Inc. Bank of America Tower at One Bryant Park New York, New York 10036 Dear Sirs, The purpose of this letter agreement (this “Forward Confirmation”) is to confirm the ter

September 14, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

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 14, 2023 (Date of earliest event reported) September 11, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation

September 14, 2023 EX-1.1

Underwriting Agreement, dated September 11, 2023, among ONE Gas, Inc. and BofA Securities, Inc., acting as the underwriter, BofA Securities, Inc., acting as the forward seller, and Bank of America, N.A., acting as the forward purchaser.

Exhibit 1.1 ONE GAS, INC. 1,200,000 Shares Common Stock ($0.01 Par Value) Equity Underwriting Agreement September 11, 2023 BofA Securities, Inc. One Bryant Park New York, New York 10036 Acting in its capacity as Underwriter BofA Securities, Inc. One Bryant Park New York, New York 10036 Acting in its capacity as Forward Seller Bank of America, N.A. One Bryant Park New York, New York 10036 Acting in

September 13, 2023 EX-FILING FEES

Calculation of Filing Fee Table (Form Type) ONE Gas, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Re

Exhibit 107 Calculation of Filing Fee Table 424(b)(5) (Form Type) ONE Gas, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Share Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee(1) Fees

September 13, 2023 424B5

ONE Gas, Inc. 1,200,000 Shares of Common Stock

Table of Contents Filed pursuant to Rule 424(b)(5) Registration No. 333-269966 PROSPECTUS SUPPLEMENT (To Prospectus Dated February 23, 2023) ONE Gas, Inc. 1,200,000 Shares of Common Stock The forward seller referred to below is offering 1,200,000 shares of our common stock, par value $0.01 per share (“common stock”), in this offering. We entered into a forward sale agreement with Bank of America,

September 12, 2023 424B5

SUBJECT TO COMPLETION, DATED SEPTEMBER 11, 2023

Table of Contents Filed pursuant to Rule 424(b)(5) Registration No. 333-269966 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying base prospectus are not an offer to sell these securities and they are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is n

September 5, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) Oklahoma 001-36108 46-3561936 (State or Other Jurisdiction of Incorporation)

September 5, 2023 EX-99.1

ONE Gas Announces Angela E. Kouplen Senior Vice President – Chief Human Resources Officer

Exhibit 99.1 Sept. 5, 2023 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 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. I

August 1, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2023. ☐ Transition Report Pursuant to

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2023. OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number 001-36108 ONE Gas, Inc. (Exac

July 31, 2023 EX-99.1

ONE Gas Announces Second Quarter 2023 Financial Results; Reaffirms 2023 Financial Guidance

Exhibit 99.1 July 31, 2023 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces Second Quarter 2023 Financial Results; Reaffirms 2023 Financial Guidance TULSA, Okla. - July 31, 2023 - ONE Gas, Inc. (NYSE: OGS) today announced its second quarter financial results and reaffirmed its 2023 financial guidance. “We enter the second half of the year focused

July 31, 2023 8-K

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) July 31, 2023 (Date of earliest event reported) July 31, 2023 ONE

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) July 31, 2023 (Date of earliest event reported) July 31, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer

July 17, 2023 8-K

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) July 17, 2023 (Date of earliest event reported) July 17, 2023 ONE

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) July 17, 2023 (Date of earliest event reported) July 17, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer

July 17, 2023 EX-99.1

ONE Gas Declares Quarterly Dividend

Exhibit 99.1 July 17, 2023 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Declares Quarterly Dividend TULSA, Okla. - July 17, 2023 - The board of directors of ONE Gas, Inc. (NYSE: OGS) today declared a quarterly dividend of 65 cents per share of common stock, payable Sept. 1, 2023, to shareholders of record at the close of business Aug. 16, 2023. ONE Gas

July 6, 2023 8-K

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) July 6, 2023 (Date of earliest event reported) June 29, 2023 ONE G

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) July 6, 2023 (Date of earliest event reported) June 29, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer o

July 6, 2023 EX-99.1

ONE Gas Adds New Member to Board of Directors

Exhibit 99.1 June 29, 2023 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Adds New Member to Board of Directors TULSA, Okla. – June 29, 2023 – ONE Gas, Inc. (NYSE: OGS) has appointed Deborah Hersman to its board of directors, effective June 29, 2023, expanding its board from eight to nine members. Hersman, 53, is the former chair of the National Transport

July 5, 2023 EX-99.1

ONE Gas Second Quarter 2023 Conference Call and Webcast Scheduled

Exhibit 99.1 July 5, 2023 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Second Quarter 2023 Conference Call and Webcast Scheduled TULSA, Okla. – July 5, 2023 – ONE Gas, Inc. (NYSE: OGS) will release its second quarter 2023 financial results after the market closes on Monday, July 31, 2023. The ONE Gas executive management team will host a conference call

July 5, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) July 5, 2023 (Date of earliest event reported) July 5, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer of

June 22, 2023 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 11-K X ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 __ TRANSITION REPORT PURSUANT TO SECTION 15(d

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 11-K X ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period fromto Commission file number 001-36108 A.

May 31, 2023 8-K

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 31, 2023 (Date of earliest event reported) May 25, 2023 ONE Ga

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 31, 2023 (Date of earliest event reported) May 25, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer of

May 4, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Pro

May 2, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2023. ☐ Transition Report Pursuant to

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2023. OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number 001-36108 ONE Gas, Inc. (Exa

May 1, 2023 EX-99.1

ONE Gas Announces First Quarter 2023 Financial Results; Affirms 2023 Financial Guidance Declares Second Quarter Dividend

Exhibit 99.1 May 1, 2023 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces First Quarter 2023 Financial Results; Affirms 2023 Financial Guidance Declares Second Quarter Dividend TULSA, Okla. - May 1, 2023 - ONE Gas, Inc. (NYSE: OGS) today announced its first quarter financial results, affirmed its 2023 financial guidance and declared its quarterly

May 1, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

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 1, 2023 (Date of earliest event reported) May 1, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer of i

April 17, 2023 8-K

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) April 17, 2023 (Date of earliest event reported) April 17, 2023 ON

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) April 17, 2023 (Date of earliest event reported) April 17, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employe

April 17, 2023 EX-99.1

ONE Gas to Participate in American Gas Association Financial Forum

Exhibit 99.1 April 17, 2023 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas to Participate in American Gas Association Financial Forum TULSA, Okla. – April 17, 2023 – ONE Gas, Inc. (NYSE: OGS) today announced it will participate in the American Gas Association Financial Forum on Sunday and Monday, May 21-22, 2023, in Fort Lauderdale, Florida. Robert S. McA

April 5, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defi

April 4, 2023 EX-99.1

ONE Gas First Quarter 2023 Conference Call and Webcast Scheduled

Exhibit 99.1 April 4, 2023 Analyst Contact: Erin Dailey 918-947-7411 Media Contact: Leah Harper 918-947-7123 ONE Gas First Quarter 2023 Conference Call and Webcast Scheduled TULSA, Okla. – April 4, 2023 – ONE Gas, Inc. (NYSE: OGS) will release its first quarter 2023 financial results after the market closes on Monday, May 1, 2023. The ONE Gas executive management team will host a conference call t

April 4, 2023 8-K

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) April 4, 2023 (Date of earliest event reported) April 4, 2023 ONE

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) April 4, 2023 (Date of earliest event reported) April 4, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employer

March 29, 2023 8-K

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) March 29, 2023 (Date of earliest event reported) March 23, 2023 ON

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) March 29, 2023 (Date of earliest event reported) March 23, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Employe

March 16, 2023 8-K

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) March 16, 2023 (Date of earliest event reported) March 16, 2023 ON

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) March 16, 2023 (Date of earliest event reported) March 16, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation) (Commi

March 16, 2023 EX-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.

EX-10.1 Exhibit 10.1 EXTENSION AGREEMENT (Extension of Maturity Date Pursuant to Section 2.15 of the Credit Agreement) This EXTENSION AGREEMENT (this “Agreement”) dated as of March 16, 2023 (the “Extension Effective Date”) is entered into by and among ONE GAS, INC., an Oklahoma corporation (“Borrower”), the undersigned Lenders (as defined in the Credit Agreement) (the “Consenting Lenders”), and BA

March 13, 2023 EX-1.1

Equity Underwriting Agreement, dated as of March 8, 2023, among ONE Gas, Inc. and BofA Securities, Inc., acting as the underwriter, BofA Securities, Inc., acting as the forward seller, and Bank of America, N.A., acting as the forward purchaser.

EX-1.1 2 d455749dex11.htm EX-1.1 Exhibit 1.1 ONE GAS, INC. 2,000,000 Shares Common Stock ($0.01 Par Value) Equity Underwriting Agreement March 8, 2023 BofA Securities, Inc. One Bryant Park New York, New York 10036 Acting in its capacity as Underwriter BofA Securities, Inc. One Bryant Park New York, New York 10036 Acting in its capacity as Forward Seller Bank of America, N.A. One Bryant Park New Yo

March 13, 2023 EX-10.1

Confirmation of Forward Sale Transaction, dated as of March 8, 2023, between ONE Gas, Inc. and Bank of America, N.A. (incorporated by reference to Exhibit 10.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on March 13, 2023 (File No. 1-36108)).

EX-10.1 Exhibit 10.1 March 8, 2023 To: ONE Gas, Inc. 15 East Fifth Street Tulsa, OK 74103 From: Bank of America, N.A. c/o BofA Securities, Inc. Bank of America Tower at One Bryant Park New York, New York 10036 From: BofA Securities, Inc. Bank of America Tower at One Bryant Park New York, New York 10036 Dear Sirs, The purpose of this letter agreement (this “Forward Confirmation”) is to confirm the

March 13, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

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) March 13, 2023 (Date of earliest event reported) March 8, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation) (Commis

March 10, 2023 424B5

ONE Gas, Inc. 2,000,000 Shares of Common Stock

424B5 Table of Contents Filed pursuant to Rule 424(b)(5) Registration No. 333-269966 PROSPECTUS SUPPLEMENT (To Prospectus Dated February 23, 2023) ONE Gas, Inc. 2,000,000 Shares of Common Stock The forward seller referred to below is offering 2,000,000 shares of our common stock, par value $0.01 per share (“common stock”), in this offering. We entered into a forward sale agreement with Bank of Ame

March 10, 2023 EX-FILING FEES

Calculation of Filing Fee Table (Form Type) ONE Gas, Inc. (Exact Name of Registrant as Specified in its Charter) Newly Registered Securities Security Type Security Class Title(1) Fee Calculation Rule Amount Registered Maximum Aggregate Offering Price

Exhibit 107 Calculation of Filing Fee Table 424(b)(5) (Form Type) ONE Gas, Inc. (Exact Name of Registrant as Specified in its Charter) Newly Registered Securities Security Type Security Class Title(1) Fee Calculation Rule Amount Registered Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Stock Rule 457(r) 2,300,000 176,870,000 0.00011020 $19,491.08 Total Offering

March 9, 2023 424B5

SUBJECT TO COMPLETION, DATED MARCH 8, 2023

424B5 1 d381955d424b5.htm 424B5 Table of Contents Filed pursuant to Rule 424(b)(5) Registration No. 333-269966 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying base prospectus are not an offer to sell these securities and they are not soliciting an offer to buy these securities in any jurisdict

February 24, 2023 424B5

ONE Gas, Inc. Common Stock Having an Aggregate Offering Price of up to

424B5 1 d455114d424b5.htm 424B5 Table of Contents Filed pursuant to Rule 424(b)(5) Registration No. 333-269966 PROSPECTUS SUPPLEMENT (To Prospectus Dated February 23, 2023) ONE Gas, Inc. Common Stock Having an Aggregate Offering Price of up to $300,000,000 On February 24, 2023, we entered into an equity distribution agreement with BofA Securities, Inc., J.P. Morgan Securities LLC, Mizuho Securitie

February 24, 2023 8-K

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) February 24, 2023 (Date of earliest event reported) February 24, 2

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) February 24, 2023 (Date of earliest event reported) February 24, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS E

February 24, 2023 EX-99.1

ONE Gas Sets Record Date for 2023 Annual Meeting of Shareholders

Exhibit 99.1 February 24, 2023 Analyst Contact: Paige Gero 918-947-7787 Media Contact: Leah Harper 918-947-7123 ONE Gas Sets Record Date for 2023 Annual Meeting of Shareholders TULSA, Okla. – Feb. 24, 2023 – ONE Gas, Inc. (NYSE: OGS) will hold its 2023 Annual Meeting of Shareholders as a virtual meeting only on Thursday, May 25, 2023, at 9 a.m. Central Daylight Time. The meeting will also be audio

February 24, 2023 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type) ONE Gas, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule (1) Amou

Exhibit 107 Calculation of Filing Fee Tables 424(b)(5) (Form Type) ONE Gas, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule (1) Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price (2) Fee Rate Amount of Registration Fee

February 24, 2023 8-K

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) February 24, 2023 (Date of earliest event reported) February 24, 2

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) February 24, 2023 (Date of earliest event reported) February 24, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation)

February 24, 2023 EX-1.1

Equity Distribution Agreement, dated as of February 24, 2023, among ONE Gas, Inc. and BofA Securities, Inc., J.P. Morgan Securities, LLC, Mizuho Securities USA LLC and RBC Capital Markets, LLC, acting as managers; Bank of America, N.A., JPMorgan Chase Bank, National Association, Mizuho Markets Americas LLC and Royal Bank of Canada, acting as forward purchasers; and BofA Securities, Inc., J.P. Morgan Securities LLC, Mizuho Securities USA LLC and RBC Capital Markets, LLC, acting as forward sellers (incorporated by reference to Exhibit 1.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on February 24, 2023 (File No. 1-36108)

EX-1.1 Exhibit 1.1 ONE GAS, INC. COMMON STOCK (PAR VALUE $0.01 PER SHARE) EQUITY DISTRIBUTION AGREEMENT February 24, 2023 February 24, 2023 To: BofA Securities, Inc. One Bryant Park New York, New York 10036 Bank of America, N.A. One Bryant Park New York, New York 10036 BofA Securities, Inc. One Bryant Park New York, New York 10036 J.P. Morgan Securities LLC 383 Madison Avenue New York, New York 10

February 23, 2023 EX-21.1

Subsidiaries of ONE Gas, Inc.

Exhibit 21.1 SUBSIDIARIES OF ONE Gas, Inc. 1.ONE Gas Properties, L.L.C., an Oklahoma limited liability company. 2.Utility Insurance Company, an Oklahoma company. 3.Kansas Gas Service Securitization I, L.L.C., a Delaware limited liability company.

February 23, 2023 EX-FILING FEES

Filing Fee Table

Exhibit 107 CALCULATION OF FILING FEE TABLES Form S-3ASR (Form Type) ONE Gas, Inc.

February 23, 2023 EX-FILING FEES

Filing Fee Table

Exhibit 107 CALCULATION OF FILING FEE TABLES Form S-3ASR (Form Type) ONE Gas, Inc.

February 23, 2023 EX-25.2

Statement of Eligibility of the Trustee under the Trust Indenture Act of 1939 on Form T-1 with respect to the Subordinated Indenture.

EX-25.2 Exhibit 25.2 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) ☐ U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036

February 23, 2023 10-K

Form 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022. OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number 001-36108 ONE Gas, Inc. (Exact na

February 23, 2023 EX-25.1

Statement of Eligibility of the Trustee under the Trust Indenture Act of 1939 on Form T-1 with respect to the Senior Indenture.

EX-25.1 Exhibit 25.1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) ☐ U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036

February 23, 2023 S-3ASR

As filed with the Securities and Exchange Commission on February 23, 2023

S-3ASR Table of Contents As filed with the Securities and Exchange Commission on February 23, 2023 Registration No.

February 23, 2023 EX-10.11

Form of 2023 Performance Unit Award Agreement (incorporated by reference to Exhibit 10.11 to ONE Gas, Inc.’s Annual Report on Form 10-K filed on February 23, 2023 (File No. 1-36108)).

formof2023performanceuni ONE GAS, INC. PERFORMANCE UNIT AWARD AGREEMENT This Performance Unit Award Agreement (this “Agreement”) is made and entered into as of February 20, 2023 (the “Grant Date”) by and between ONE Gas, Inc., an Oklahoma corporation (the “Company”) and the “Participant” named below. Participant: %%FIRSTNAMEMIDDLENAMELASTNAME%-% WHEREAS, the Company has adopted the ONE Gas, Inc. A

February 23, 2023 EX-10.10

Form of 2023 Restricted Unit Award Agreement (incorporated by reference to Exhibit 10.10 to ONE Gas, Inc.’s Annual Report on Form 10-K filed on February 23, 2023 (File No. 1-36108)).

formof2023restrictedunit ONE GAS, INC. RESTRICTED UNIT AWARD AGREEMENT This Restricted Unit Award Agreement (this “Agreement”) is made and entered into as of February 20, 2023 (the “Grant Date”) by and between ONE Gas, Inc., an Oklahoma corporation (the “Company”) and the “Participant” named below. Participant: %%FIRSTNAMEMIDDLENAMELASTNAME%-% WHEREAS, the Company has adopted the ONE Gas, Inc. Ame

February 23, 2023 S-3ASR

As filed with the Securities and Exchange Commission on February 23, 2023

Table of Contents As filed with the Securities and Exchange Commission on February 23, 2023 Registration No.

February 22, 2023 8-K

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) February 22, 2023 (Date of earliest event reported) February 22, 2

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) February 22, 2023 (Date of earliest event reported) February 22, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS E

February 22, 2023 EX-99.1

ONE Gas Announces Fourth Quarter and Full Year 2022 Financial Results Analysts' call and webcast scheduled tomorrow, Feb. 23 at 11a.m. EST

Exhibit 99.1 February 22, 2023 Analyst Contact: Brandon Lohse 918-947-7472 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces Fourth Quarter and Full Year 2022 Financial Results Analysts' call and webcast scheduled tomorrow, Feb. 23 at 11a.m. EST TULSA, Okla. - Feb. 22, 2023 - ONE Gas, Inc. (NYSE: OGS) today announced its fourth quarter and full year 2022 financial results, which included d

February 21, 2023 8-K

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) February 21, 2023 (Date of earliest event reported) February 21, 2

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) February 21, 2023 (Date of earliest event reported) February 21, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction of incorporation)

February 21, 2023 EX-3.1

Amended and Restated By-Laws of ONE Gas, Inc. dated February 21, 2023 (incorporated by reference to Exhibit 3.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on February 21, 2023 (File No. 1-36108)).

EX-3.1 Exhibit 3.1 AMENDED AND RESTATED BY-LAWS of ONE Gas, Inc. (an Oklahoma corporation) ARTICLE I OFFICES Section 1.01 Principal Office. The principal office for the transaction of the business of ONE Gas, Inc. (the “Corporation”) shall be located at 15 E. 5th St., Tulsa, Oklahoma 74103 (the “Principal Office”). The Corporation’s board of directors (the “Board”) is hereby granted full power and

February 16, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) February 16, 2023 (Date of earliest event reported) February 15, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS E

February 16, 2023 EX-99.1

ONE Gas to Participate in Morgan Stanley and BofA Energy and Power Conferences

Exhibit 99.1 February 15, 2023 Analyst Contact: Brandon Lohse 918-947-7472 Media Contact: Leah Harper 918-947-7123 ONE Gas to Participate in Morgan Stanley and BofA Energy and Power Conferences TULSA, Okla. – Feb. 15, 2023 – ONE Gas, Inc. (NYSE: OGS) today announced it will participate in the Morgan Stanley Global Energy and Power Conference on Monday, Feb. 27, 2023, in New York City, New York, fo

February 9, 2023 SC 13G/A

OGS / ONE Gas Inc / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: ONE Gas Inc. Title of Class of Securities: Common Stock CUSIP Number: 68235P108 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule

February 8, 2023 SC 13G/A

OGS / ONE Gas Inc / AMERICAN CENTURY INVESTMENT MANAGEMENT INC - SC 13G/A Passive Investment

United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 8)* ONE GAS, INC. (Name of Issuer) COMMON STOCK (Title of Class of Securities) 68235P108 (CUSIP Number) DECEMBER 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule

January 27, 2023 EX-99.1

ONE Gas Fourth Quarter and Year End 2022 Conference Call and Webcast Scheduled Also Announced

Exhibit 99.1 January 26, 2023 Analyst Contact: Brandon Lohse 918-947-7472 Media Contact: Leah Harper 918-947-7123 ONE Gas Fourth Quarter and Year End 2022 Conference Call and Webcast Scheduled Schedule for 2023 Earnings News Releases, Conference Calls and Webcasts Also Announced TULSA, Okla. – Jan. 26, 2023 – ONE Gas, Inc. (NYSE: OGS) will release its fourth quarter and full year 2022 financial re

January 27, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) January 27, 2023 (Date of earliest event reported) January 26, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

January 24, 2023 EX-99.1

ONE Gas Increases Quarterly Dividend; Narrows 2022 Financial Guidance

Exhibit 99.1 January 24, 2023 Analyst Contact: Brandon Lohse 918-947-7472 Media Contact: Leah Harper 918-947-7123 ONE Gas Increases Quarterly Dividend; Narrows 2022 Financial Guidance TULSA, Okla. - Jan. 24, 2023 - The board of directors of ONE Gas, Inc. (NYSE: OGS) today increased the dividend for the first quarter 2023 by 3 cents per share to 65 cents per share, resulting in an annualized divide

January 24, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

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) January 24, 2023 (Date of earliest event reported) January 24, 2023 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

December 2, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) December 2, 2022 (Date of earliest event reported) December 2, 2022 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

December 2, 2022 EX-99.1

ONE Gas to Participate in BofA and Wells Fargo Utility Conferences

Exhibit 99.1 December 2, 2022 Analyst Contact: Brandon Lohse 918-947-7472 Media Contact: Leah Harper 918-947-7123 ONE Gas to Participate in BofA and Wells Fargo Utility Conferences TULSA, Okla. ? Dec. 2, 2022 ? ONE Gas, Inc. (NYSE: OGS) today announced it will participate in the BofA Securities Gas Utility Conference on Monday, Dec. 5, 2022, in New York City, followed by the Wells Fargo Midstream,

November 30, 2022 EX-99.1

ONE Gas Issues 2023 Financial Guidance Five-year Financial Growth Rates Updated; Capital Investment Forecast Increased

Exhibit 99.1 November 30, 2022 Analyst Contact: Brandon Lohse 918-947-7472 Media Contact: Leah Harper 918-947-7123 ONE Gas Issues 2023 Financial Guidance Five-year Financial Growth Rates Updated; Capital Investment Forecast Increased TULSA, Okla. - Nov. 30, 2022 - ONE Gas, Inc. (NYSE: OGS) today issued financial guidance for 2023 and updated its five-year growth rates. ?We remain focused on execut

November 30, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) November 30, 2022 (Date of earliest event reported) November 30, 2022 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS E

November 30, 2022 EX-99.2

November 30, 2022 2023 FINANCIAL GUIDANCE FORWARD LOOKING STATEMENTS | 2FORWARD LOOKIN ST TE ENTS | 2 Forward-Looking Statements Statements contained in this presentation that include or refer to Company expectations, our business outlook, our future

November 30, 2022 2023 FINANCIAL GUIDANCE FORWARD LOOKING STATEMENTS | 2FORWARD LOOKIN ST TE ENTS | 2 Forward-Looking Statements Statements contained in this presentation that include or refer to Company expectations, our business outlook, our future plans or predictions relating to any matters should be considered forward-looking statements that are covered by the safe harbor provisions of the Private Securities Litigation Reform Act of 1995, the Securities Act of 1933 and the Securities and Exchange Act of 1934, each as amended.

November 18, 2022 EX-3.3

Amended and Restated Limited Liability Company Agreement of Kansas Gas Service Securitization I, L.L.C., dated as of November 16, 2022 (incorporated by reference to Exhibit 3.3 to ONE Gas, Inc.’s Current Report on Form 8-K filed on November 18, 2022 (File No. 1-36108)).

Exhibit 3.3 AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF KANSAS GAS SERVICE SECURITIZATION I, L.L.C. Dated as of November 16, 2022 TABLE OF CONTENTS Page ARTICLE I GENERAL PROVISIONS SECTION 1.01 Definitions 1 SECTION 1.02 Sole Member; Registered Office and Agent 2 SECTION 1.03 Other Offices 3 SECTION 1.04 Name 3 SECTION 1.05 Purpose; Nature of Business Permitted; Powers 3 SECTION 1

November 18, 2022 EX-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 (incorporated by reference to Exhibit 10.3 to ONE Gas, Inc.’s Current Report on Form 8-K filed on November 18, 2022 (File No. 1-36108)).

Exhibit 10.3 ADMINISTRATION AGREEMENT ADMINISTRATION AGREEMENT, dated as of November 18, 2022 (this ?Administration Agreement?), is by and between KANSAS GAS SERVICE SECURITIZATION I, L.L.C., a Delaware limited liability company, as Issuer (the ?Issuer?), and KANSAS GAS SERVICE, a division of ONE Gas, Inc., an Oklahoma corporation (?KGS?), as Administrator (in such capacity, the ?Administrator?).

November 18, 2022 EX-99.3

November 18, 2022

Exhibit 99.3 4801 Main Street, Suite 1000 Kansas City, MO 64112 Main: 816.983.8000 Fax: 816.983.8080 November 18, 2022 To the Addressees set forth on Schedule A RE: Kansas Gas Service, a Division of ONE Gas, Inc. Kansas Gas Service Securitization I, L.L.C. Opinion Letter Regarding Kansas Constitutional Issues Ladies and Gentlemen: We have acted as special counsel in the State of Kansas, sometimes

November 18, 2022 EX-99.2

THE TRANSACTION

Exhibit 99.2 910 LOUISIANA HOUSTON, TEXAS 77002-4995 TEL +1 713.229.1234 FAX +1 713.229.1522 BakerBotts.com AUSTIN BRUSSELS DALLAS DUBAI HOUSTON LONDON NEW YORK PALO ALTO RIYADH SAN FRANCISCO SINGAPORE WASHINGTON November 18, 2022 TO: THE ADDRESSEES ON APPENDIX A Re: Kansas Gas Service Securitization I, L.L.C. Series 2022-A Senior Secured Securitized Utility Tariff Bonds, Tranche A ? U.S. Constitu

November 18, 2022 EX-4.1

Indenture by and among Kansas Gas Service Securitization I, L.L.C., U.S. Bank Trust Company, National Association, as Indenture Trustee, and U.S. Bank National Association, as Securities Intermediary (including the form of the Securitized Utility Tariff Bonds and the Series Supplement), dated as of November 18, 2022 (incorporated by reference to Exhibit 4.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on November 18, 2022 (File No. 1-36108)).

Exhibit 4.1 INDENTURE by and among KANSAS GAS SERVICE SECURITIZATION I, L.L.C., Issuer and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, Indenture Trustee and U.S. BANK NATIONAL ASSOCIATION, Securities Intermediary Dated as of November 18, 2022 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND RULES OF CONSTRUCTION; INCORPORATION BY REFERENCE 2 SECTION 1.01. Definitions and Rules of Construction 2

November 18, 2022 EX-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 (incorporated by reference to Exhibit 10.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on November 18, 2022 (File No. 1-36108)).

Exhibit 10.1 SECURITIZED UTILITY TARIFF PROPERTY SERVICING AGREEMENT by and between KANSAS GAS SERVICE SECURITIZATION I, L.L.C. Issuer and KANSAS GAS SERVICE, A DIVISION OF ONE GAS, INC. Servicer Dated as of November 18, 2022 TABLE OF CONTENTS ARTICLE I. DEFINITIONS AND RULES OF CONSTRUCTION 4 SECTION 1.01. Definitions and Rules of Construction 4 ARTICLE II. APPOINTMENT AND AUTHORIZATION OF SERVIC

November 18, 2022 EX-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 (incorporated by reference to Exhibit 10.2 to ONE Gas, Inc.’s Current Report on Form 8-K filed on November 18, 2022 (File No. 1-36108)).

Exhibit 10.2 SECURITIZED UTILITY TARIFF PROPERTY PURCHASE AND SALE AGREEMENT between KANSAS GAS SERVICE SECURITIZATION I, L.L.C. Issuer and KANSAS GAS SERVICE, a Division of ONE Gas, Inc. Seller Dated as of November 18, 2022 TABLE OF CONTENTS ARTICLE I DEFINITIONS 1 Section 1.01 Definitions 1 Section 1.02 Other Definitional Provisions 1 ARTICLE II CONVEYANCE OF THE SECURITIZED UTILITY TARIFF PROPE

November 18, 2022 EX-4.2

Series Supplement by and among Kansas Gas Service Securitization I, L.L.C. and U.S. Bank Trust Company, National Association, as Indenture Trustee, dated as of November 18, 2022 (incorporated by reference to Exhibit 4.2 to ONE Gas, Inc.’s Current Report on Form 8-K filed on November 18, 2022 (File No. 1-36108)).

Exhibit 4.2 This SERIES SUPPLEMENT, dated as of November 18, 2022 (this ?Supplement?), is by and between KANSAS GAS SERVICE SECURITIZATION I, L.L.C., a limited liability company created under the laws of the State of Delaware (the ?Issuer?), and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (?Bank?), not in its individual capacity, but solely in its capacity as indenture trustee (the ?Indenture Tr

November 18, 2022 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Other Events

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: November 18, 2022 Date of earliest event reported: November 16, 2022 Commission file number Registrant, State of Incorporation or Organization, Address of Principal Executive Offices and Telephone Number IRS Employer

November 14, 2022 EX-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.

Exhibit 10.3 ADMINISTRATION AGREEMENT ADMINISTRATION AGREEMENT, dated as of November 18, 2022 (this ?Administration Agreement?), is by and between KANSAS GAS SERVICE SECURITIZATION I, L.L.C., a Delaware limited liability company, as Issuer (the ?Issuer?), and KANSAS GAS SERVICE, a division of ONE Gas, Inc., an Oklahoma corporation (?KGS?), as Administrator (in such capacity, the ?Administrator?).

November 14, 2022 EX-4.1

Indenture by and among Kansas Gas Service Securitization I, L.L.C., U.S. Bank Trust Company, National Association, as Indenture Trustee, and U.S. Bank National Association, as Securities Intermediary (including the form of the Bonds and the Series Supplement), to be dated as of November 18, 2022.

Exhibit 4.1 INDENTURE by and among KANSAS GAS SERVICE SECURITIZATION I, L.L.C., Issuer and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, Indenture Trustee and U.S. BANK NATIONAL ASSOCIATION, Securities Intermediary Dated as of November 18, 2022 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND RULES OF CONSTRUCTION; INCORPORATION BY REFERENCE 2 SECTION 1.01. Definitions and Rules of Construction 2

November 14, 2022 EX-3.3

Amended and Restated Limited Liability Company Agreement of Kansas Gas Service Securitization I, L.L.C., to be dated as of November 16, 2022.

Exhibit 3.3 AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF KANSAS GAS SERVICE SECURITIZATION I, L.L.C. Dated as of November 16, 2022 TABLE OF CONTENTS Page ARTICLE I GENERAL PROVISIONS SECTION 1.01 Definitions 1 SECTION 1.02 Sole Member; Registered Office and Agent 2 SECTION 1.03 Other Offices 3 SECTION 1.04 Name 3 SECTION 1.05 Purpose; Nature of Business Permitted; Powers 3 SECTION 1

November 14, 2022 EX-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.

Exhibit 10.1 SECURITIZED UTILITY TARIFF PROPERTY SERVICING AGREEMENT by and between KANSAS GAS SERVICE SECURITIZATION I, L.L.C. Issuer and KANSAS GAS SERVICE, A DIVISION OF ONE GAS, INC. Servicer Dated as of November 18, 2022 TABLE OF CONTENTS ARTICLE I. DEFINITIONS AND RULES OF CONSTRUCTION 4 SECTION 1.01. Definitions and Rules of Construction 4 ARTICLE II. APPOINTMENT AND AUTHORIZATION OF SERVIC

November 14, 2022 EX-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.

Exhibit 10.2 SECURITIZED UTILITY TARIFF PROPERTY PURCHASE AND SALE AGREEMENT between KANSAS GAS SERVICE SECURITIZATION I, L.L.C. Issuer and KANSAS GAS SERVICE, a Division of ONE Gas, Inc. Seller Dated as of November 18, 2022 TABLE OF CONTENTS ARTICLE I DEFINITIONS 1 Section 1.01 Definitions 1 Section 1.02 Other Definitional Provisions 1 ARTICLE II CONVEYANCE OF THE SECURITIZED UTILITY TARIFF PROPE

November 14, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

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: November 14, 2022 Date of earliest event reported: November 9, 2022 Commission file number Registrant, State of Incorporation or Organization, Address of Principal Executive Offices and Telephone Number IRS Employer I

November 14, 2022 424B1

Initial price to

Table of Contents Filed Pursuant to Rule 424(b)(1) Registration Statement Nos. 333-267322 and 333-267322-01 PROSPECTUS $336,000,000 Series 2022-A Senior Secured Securitized Utility Tariff Bonds Kansas Gas Service, a division of ONE Gas, Inc. Sponsor, Depositor and Initial Servicer Central Index Key Number: 0001587732 Kansas Gas Service Securitization I, L.L.C. Issuing Entity Central Index Key Numb

November 14, 2022 EX-1.1

Underwriting Agreement among Kansas Gas Service Securitization I, L.L.C., Kansas Gas Service, a Division of ONE Gas, Inc., J.P. Morgan Securities LLC and RBC Capital Markets, LLC, as representatives of the underwriters named therein, dated November 9, 2022.

EX-1.1 2 d360379dex11.htm EX-1.1 Exhibit 1.1 KANSAS GAS SERVICE SECURITIZATION I, L.L.C. KANSAS GAS SERVICE, A DIVISION OF ONE GAS, INC. $336,000,000 SERIES 2022-A SENIOR SECURED SECURITIZED UTILITY TARIFF BONDS, TRANCHE A UNDERWRITING AGREEMENT November 9, 2022 To the Representatives named in Schedule I hereto of the Underwriters named in Schedule II hereto Ladies and Gentlemen: 1. Introduction.

November 10, 2022 FWP

Kansas Gas Service Securitization I, L.L.C. (Issuing Entity) PRICING TERM SHEET $336,000,000 Series 2022-A Senior Secured Securitized Utility Tariff Bonds Issuing entity: Kansas Gas Service Securitization I, L.L.C. Sponsor, depositor and initial serv

Free Writing Prospectus, dated November 9, 2022 Filed pursuant to Rule 433 under the Securities Act of 1933 Relating to the Preliminary Prospectus, dated October 26, 2022, and Preliminary Term Sheet, dated November 3, 2022 Registration Statement Nos.

November 3, 2022 CORRESP

KANSAS GAS SERVICE, A DIVISION OF ONE GAS, INC. 15 EAST FIFTH STREET TULSA, OKLAHOMA 74103

CORRESP 1 filename1.htm KANSAS GAS SERVICE, A DIVISION OF ONE GAS, INC. 15 EAST FIFTH STREET TULSA, OKLAHOMA 74103 November 3, 2022 Via EDGAR United States Securities and Exchange Commission 100 F Street, N.E. Washington, D.C. 20549 Division of Corporation Finance Office of Structured Finance Attention: Kayla Roberts and Arthur Sandel RE: Kansas Gas Service, a Division of ONE Gas, Inc. Kansas Gas

November 3, 2022 FWP

Kansas Gas Service Securitization I, L.L.C. (Issuing Entity) PRELIMINARY TERM SHEET $336,000,000 Series 2022-A Senior Secured Securitized Utility Tariff Bonds Issuing entity: Kansas Gas Service Securitization I, L.L.C. Sponsor, depositor and initial

FWP Free Writing Prospectus, dated November 3, 2022 Filed pursuant to Rule 433 under the Securities Act of 1933 Supplementing the Preliminary Prospectus, dated October 26, 2022 Registration Statement Nos.

November 3, 2022 CORRESP

Remainder of the page intentionally left blank

November 3, 2022 Division of Corporation Finance Securities and Exchange Commission Division of Corporate Finance 100 F Street, N.

November 2, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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) November 2, 2022 (Date of earliest event reported) November 1, 2022 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

November 1, 2022 EX-10.3

ONE Gas, Inc. Deferred Compensation Plan for Non-Employee Directors, amended and restated effective July 18, 2022 (incorporated by reference to Exhibit 10.3 of ONE Gas, Inc.’s Quarterly Report on Form 10-Q filed on November 1, 2022 (File No. 1-36108)).

ONE GAS, INC. DEFERRED COMPENSATION PLAN FOR NON-EMPLOYEE DIRECTORS Effective July 18, 2022 ARTICLE I ESTABLISHMENT OF PLAN The Board of Directors of ONE Gas, Inc., an Oklahoma corporation (the "Company"), on February 18, 2014, established this ONE Gas, Inc. Deferred Compensation Plan for Non- Employee Directors (the "Plan), a non-qualified deferred compensation plan pursuant to which any Director

November 1, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2022. ☐ Transition Report Pursuan

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2022. OR ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission file number 001-36108 ONE Gas, Inc.

November 1, 2022 8-K/A

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (Date of report) October 31, 2022 (Date of earliest event reported) October 31, 2022 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS E

November 1, 2022 EX-99.1

/CORRECTION — ONE Gas, Inc./

Exhibit 99.1 /CORRECTION ? ONE Gas, Inc./ This news release is being issued as a correction to our third quarter 2022 financial results and report released on October 31, 2022. The sole purpose of this correction is due to an inadvertent error that omitted the "Repayment of long-term debt" line in the financing activities section of the unaudited Consolidated Statements of Cash Flows. No other cha

October 31, 2022 EX-99.1

ONE Gas Announces Third Quarter 2022 Financial Results; Narrows 2022 Financial Guidance Declares Fourth Quarter Dividend

Exhibit 99.1 October 31, 2022 Analyst Contact: Brandon Lohse 918-947-7472 Media Contact: Leah Harper 918-947-7123 ONE Gas Announces Third Quarter 2022 Financial Results; Narrows 2022 Financial Guidance Declares Fourth Quarter Dividend TULSA, Okla. - Oct. 31, 2022 - ONE Gas, Inc. (NYSE: OGS) today announced its third quarter 2022 financial results, narrowed its 2022 financial guidance and declared

October 31, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

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) October 31, 2022 (Date of earliest event reported) October 31, 2022 ONE Gas, Inc. (Exact name of registrant as specified in its charter) Oklahoma 001-36108 46-3561936 (State or other jurisdiction (Commission (IRS Emp

October 28, 2022 CORRESP

KANSAS GAS SERVICE, A DIVISION OF ONE GAS, INC. 15 EAST FIFTH STREET TULSA, OKLAHOMA 74103

KANSAS GAS SERVICE, A DIVISION OF ONE GAS, INC. 15 EAST FIFTH STREET TULSA, OKLAHOMA 74103 October 28, 2022 Via EDGAR and Electronic Mail United States Securities and Exchange Commission 100 F Street, N.E. Washington, D.C. 20549 Division of Corporation Finance Office of Structured Finance Attention: Kayla Roberts and Arthur Sandel RE: Kansas Gas Service, a Division of ONE Gas, Inc. Kansas Gas Serv

October 28, 2022 SF-1/A

As filed with the U.S. Securities and Exchange Commission on October 28, 2022

As filed with the U.S. Securities and Exchange Commission on October 28, 2022 Registration Nos. 333-267322 and 333-267322-01 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 Amendment No. 4 to FORM SF-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 KANSAS GAS SERVICE, A DIVISION OF ONE GAS, INC. KANSAS GAS SERVICE SECURITIZATION I, L.L.C. (Exact name of registrant,

October 28, 2022 EX-4.1

Form of Indenture between Kansas Gas Service Securitization I, L.L.C. and the Trustee (including the forms of the securitized utility tariff bonds and form of Series Supplement)

Exhibit 4.1 INDENTURE by and among KANSAS GAS SERVICE SECURITIZATION I, L.L.C., Issuer and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, Indenture Trustee and U.S. BANK NATIONAL ASSOCIATION, Securities Intermediary Dated as of , 2022 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND RULES OF CONSTRUCTION; INCORPORATION BY REFERENCE 2 SECTION 1.01. Definitions and Rules of Construction 2 SECTION 1.

October 26, 2022 EX-10.1

Form of 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*

Exhibit 10.1 SECURITIZED UTILITY TARIFF PROPERTY SERVICING AGREEMENT by and between KANSAS GAS SERVICE SECURITIZATION I, L.L.C. Issuer and KANSAS GAS SERVICE, A DIVISION OF ONE GAS, INC. Servicer Dated as of [ ], 2022 TABLE OF CONTENTS ARTICLE I. DEFINITIONS AND RULES OF CONSTRUCTION 4 SECTION 1.01. Definitions and Rules of Construction 4 ARTICLE II. APPOINTMENT AND AUTHORIZATION OF SERVICER 5 SEC

October 26, 2022 EX-1.1

Form of Underwriting Agreement*

EX-1.1 2 d385537dex11.htm EX-1.1 Exhibit 1.1 KANSAS GAS SERVICE SECURITIZATION I, L.L.C. KANSAS GAS SERVICE, A DIVISION OF ONE GAS, INC. $336,000,000 SERIES 2022-A SENIOR SECURED SECURITIZED UTILITY TARIFF BONDS, TRANCHE A UNDERWRITING AGREEMENT [Pricing Date], 2022 To the Representatives named in Schedule I hereto of the Underwriters named in Schedule II hereto Ladies and Gentlemen: 1. Introducti

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