X0306 4 2020-07-20 0 0001587732 ONE Gas, Inc. OGS 0001636734 McAnnally Robert S. 15 E. 5TH STREET TULSA OK 74103 0 1 0 0 See Remarks Restricted Units July 2020 2020-07-20 4 A 0 6767 73.89 A Common stock, par value $0.01 6767 6767 D Restricted units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018). The award vests on February 18, 2023. During the 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 Robert S. McAnnally 2020-07-22