Joseph L. McCormick - 18 Feb 2025 Form 4 Insider Report for ONE Gas, Inc. (OGS)

Footnote F1

Performance units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018). The award, including dividend equivalents, vested on February 15, 2025, in an amount equal to 50% of the performance units awarded based upon Issuer's total shareholder return compared to the total shareholder return of a selected peer group and was certified by the Executive Compensation Committee of the Board of Directors on February 17, 2025. 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 15, 2025. During the 3-year vesting period, the award was credited with dividend equivalents that were paid out in shares of common stock at the time the underlying units vested and were issued. The award and credited dividend equivalents were payable one share of the Issuer's common stock for each vested restricted unit, including additional restricted units resulting from the dividend equivalents.

Footnote F3

Performance units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018). The award will vest on February 19, 2028, 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, 2025, through December 31, 2027, in accordance with the terms of the Performance Unit Award Agreement. During the 3-year vesting period, the award will be credited with dividend equivalents that will be paid out at the time the underlying units 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 F4

Restricted units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018). The award vests on February 19, 2028, in accordance with the terms of the Restricted Unit Award Agreement. During the 3-year vesting period, the award will be credited with dividend equivalents that will be paid out at the time the underlying units 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.