X0306 4 2016-02-16 0 0001587732 ONE Gas, Inc. OGS 0001595607 McCormick Joseph L 15 E. 5TH STREET TULSA OK 74103 0 1 0 0 See Remarks Performance Units 2016 2016-02-16 4 A 0 4125 58.30 A Common stock, par value $0.01 4125 4125 D Restricted Units 2016 2016-02-16 4 A 0 1025 58.30 A Common stock, par value $0.01 1025 1025 D Performance units awarded under the Issuer's Equity Compensation Plan. The award will vest on February 18, 2019, 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 18, 2019. 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 2016-02-18