Mark A. Bender - 20 Feb 2023 Form 4 Insider Report for ONE Gas, Inc. (OGS)

Footnote F1

Performance units awarded under Issuer's Amended and Restated Equity Compensation Plan (2018). The award vested on February 18, 2023, and was certified by the Executive Compensation Committee of the Board of Directors on February 20, 2023. The award vested in an amount equal to 66% 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 155 shares. The award was payable one share of Issuer's common stock for each vested performance unit and accrued dividends.

Footnote F2

Restricted units awarded under Issuer's Amended and Restated Equity Compensation Plan (2018). The award vested on February 18, 2023. The award was payable one share of Issuer's common stock for each vested restricted unit and accrued dividends of 58 shares.

Footnote F3

Performance units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018). The award will vest on February 14, 2026, 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 over the performance period from January 1, 2023, through December 31, 2025. The total shareholder return beginning stock price for the performance period is the average of the closing stock price for the 20 trading days immediately preceding the beginning of the performance period. The total shareholder return ending stock price for the performance period is the average of the closing price for the 20 trading days leading up to and including the last day of the performance period. During the 3-year vesting period,

Footnote F4

(Continued from footnote 3), 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.

Footnote F5

Restricted units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018). The award vests on February 14, 2026. 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.