Regina Gregory - 01 Oct 2025 Form 3 Insider Report for ONE Gas, Inc. (OGS)

Role: Senior Vice President, General Counsel and Assistant Secretary
Signature: /s/ Brian K. Shore, Attorney-in-Fact for Regina L. Gregory
Issuer symbol: OGS
Transactions as of: 01 Oct 2025
Net transactions value: $0
Form type: 3
Filing time: 01 Oct 2025, 16:15:08 UTC
Previous filing: 11 Aug 2023
Next filing: 19 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Gregory Regina	Senior Vice President, General Counsel and Assistant Secretary	15 EAST 5TH STREET, TULSA	/s/ Brian K. Shore, Attorney-in-Fact for Regina L. Gregory	01 Oct 2025	0001682050

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	OGS	Performance Units 2025							01 Oct 2025	Common stock, par value $0.01	3,700		Direct	F1
holding	OGS	Restricted Units 2025							01 Oct 2025	Common stock, par value $0.01	2,466		Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Performance units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018). The performance unit award vests on February 19, 2028, for a percentage (0% to 200%) of the performance units awarded based upon the Issuer's total stockholder return compared to total stockholder return of a selected peer group. During the 3-year vesting period, the award will be credited with dividend equivalents that will be paid out in shares of common stock at the time the underlying units vest and shares are issued. The award and credited dividend equivalents will be payable one share of the Issuer's common stock for each vested performance unit and dividend equivalent.
F2	Restricted units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018). The restricted unit award vests on February 19, 2028. During the 3-year vesting period, the award will be credited with dividend equivalents that will be paid out in shares of common stock at the time the underlying units vest and are issued. The award and credited dividend equivalents will be payable one share of the Issuer's common stock for each vested restricted unit and dividend equivalent.

Content

Performance units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018). The performance unit award vests on February 19, 2028, for a percentage (0% to 200%) of the performance units awarded based upon the Issuer's total stockholder return compared to total stockholder return of a selected peer group. During the 3-year vesting period, the award will be credited with dividend equivalents that will be paid out in shares of common stock at the time the underlying units vest and shares are issued. The award and credited dividend equivalents will be payable one share of the Issuer's common stock for each vested performance unit and dividend equivalent.

Restricted units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018). The restricted unit award vests on February 19, 2028. During the 3-year vesting period, the award will be credited with dividend equivalents that will be paid out in shares of common stock at the time the underlying units vest and are issued. The award and credited dividend equivalents will be payable one share of the Issuer's common stock for each vested restricted unit and dividend equivalent.

Remarks:

Senior Vice President, General Counsel and Assistant Secretary