X0206 3 2018-07-23 0 0001587732 ONE Gas, Inc. OGS 0001748167 Husen Jeffrey J 15 EAST 5TH STREET TULSA OK 74103 0 1 0 0 See Remarks Common stock, par value $0.01 1071 D Common stock, par value $0.01 2317 I by 401(k) Plan Performance Units 2016 Common stock, par value $0.01 515 D Performance Units 2017 Common stock, par value $0.01 430 D Performance Units 2018 Common stock, par value $0.01 403 D Restricted Units 2016 Common stock, par value $0.01 515 D Restricted Units 2017 Common stock, par value $0.01 430 D Restricted Units 2018 Common stock, par value $0.01 403 D Performance units awarded under the Issuer's Equity Compensation Plan. The performance unit award for 2016, 2017 and 2018 vests on February 18, 2019, February 15, 2020, and February 13, 2021, respectively, 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 Equity Compensation Plan. The restricted unit award for 2016, 2017 and 2018 vests on February 18, 2019, February 15, 2020, and February 13, 2021, respectively. 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. Vice President, Chief Accounting Officer and Controller /s/ Brian K. Shore, Attorney-in-Fact for Jeffrey J. Husen 2018-08-01