X0306 4 2017-02-18 0 0001587732 ONE Gas, Inc. OGS 0001595607 McCormick Joseph L 15 E. 5TH STREET TULSA OK 74103 0 1 0 0 See Remarks Common stock, par value $0.01 2017-02-20 4 M 0 15000 63.97 A 43554 D Common stock, par value $0.01 2017-02-20 4 F 0 6348 63.97 D 37206 D Common stock, par value $0.01 2017-02-18 4 M 0 1936 63.97 A 39142 D Common stock, par value $0.01 2017-02-18 4 F 0 887 63.97 D 38255 D Common stock, par value $0.01 2821 I by 401(k) Plan Performance Units 2014 2017-02-20 4 M 0 7225 63.97 D Common stock, par value $0.01 7225 0 D Restricted Units 2014 2017-02-18 4 M 0 1800 63.97 D Common stock, par value $0.01 1800 0 D Performance Units 2017 2017-02-20 4 A 0 4075 63.97 A Common stock, par value $0.01 4075 4075 D Restricted Units 2017 2017-02-20 4 A 0 1025 63.97 A Common stock, par value $0.01 1025 1025 D Performance units awarded under Issuer's Equity Compensation Plan. The award vested on February 18, 2017, and was certified by the Executive Compensation Committee of the Board of Directors on February 20, 2017. The award vested in an amount equal to 193% of the performance units awarded based upon Issuer's total shareholder return compared to total shareholder return of a selected peer group plus accrued dividends of 1,056 shares. The award was payable one share of Issuer's common stock for each vested performance unit and accrued dividends. Restricted units awarded under Issuer's Equity Compensation Plan. The award vested on February 18, 2017. The award was payable one share of Issuer's common stock for each vested restricted unit and accrued dividends of 136 shares. Performance units awarded under the Issuer's Equity Compensation Plan. The award will vest on February 15, 2020, 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 Equity Compensation Plan. The award vests on February 15, 2020. 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, General Counsel and Assistant Secretary /s/ Brian K. Shore, Attorney-in-Fact for Joseph L. McCormick 2017-02-22