X0306 4 2021-06-28 0 0001587732 ONE Gas, Inc. OGS 0001278745 DINAN CURTIS 15 E. 5TH STREET TULSA OK 74103 0 1 0 0 See Remarks Performance Units 2021 2021-06-28 4 A 0 2107 75.95 A Common stock, par value $0.01 2107 7610 D Restricted Units 2021 2021-06-28 4 A 0 527 75.95 A Common stock, par value $0.01 527 1903 D Performance units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018). The award will vest on February 17, 2024, for a percentage (0% to 200%) of the performance units awarded based upon the Issuer's total shareholder 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 award vests on February 17, 2024. 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. Senior Vice President and Chief Operating Officer /s/ Brian K. Shore, Attorney-in-Fact for Curtis L. Dinan 2021-06-30