Christopher P. Sighinolfi - 14 Feb 2026 Form 4 Insider Report for ONE Gas, Inc. (OGS)

Role
Senior Vice President and Chief Financial Officer
Signature
/s/ Brian K. Shore, Attorney-in-Fact for Christopher P. Sighinolfi
Issuer symbol
OGS
Transactions as of
14 Feb 2026
Net transactions value
+$782,515
Form type
4
Filing time
19 Feb 2026, 16:15:24 UTC
Previous filing
07 Apr 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Sighinolfi Christopher P. Senior Vice President and Chief Financial Officer 15 E. 5TH STREET, TULSA /s/ Brian K. Shore, Attorney-in-Fact for Christopher P. Sighinolfi 19 Feb 2026 0002003976

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction OGS Common stock, par value $0.01 Options Exercise $0 +1,362 +48% $0.000000 4,186 16 Feb 2026 Direct F1, F2
transaction OGS Common stock, par value $0.01 Tax liability $5,294 -62 -1.5% $86.04 4,125 16 Feb 2026 Direct F1, F2
transaction OGS Common stock, par value $0.01 Options Exercise $51,391 +597 +14% $86.04 4,722 14 Feb 2026 Direct F3
transaction OGS Common stock, par value $0.01 Tax liability $17,550 -204 -4.3% $86.04 4,518 14 Feb 2026 Direct F3
holding OGS Common stock, par value $0.01 930 14 Feb 2026 by 401(k) Plan

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction OGS Performance Units 2023 Options Exercise $0 -1,605 -100% $0.000000 0 16 Feb 2026 Common stock, par value $0.01 1,605 Direct F1, F2
transaction OGS Restricted Units 2023 Options Exercise $46,031 -535 -100% $86.04 0 14 Feb 2026 Common stock, par value $0.01 535 Direct F3
transaction OGS Performance Units 2026 Award $480,017 +5,579 $86.04 5,579 16 Feb 2026 Common stock, par value $0.01 5,579 Direct F4
transaction OGS Restricted Units 2026 Award $319,983 +3,719 $86.04 3,719 16 Feb 2026 Common stock, par value $0.01 3,719 Direct F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Performance units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018) (the "ECP"). The award, including dividend equivalents, vested on February 14, 2026, in an amount equal to 76% of the performance units awarded based upon Issuer's total shareholder return compared to the total shareholder return of a selected peer group, was certified by the Executive Compensation Committee of the Board of Directors on February 16, 2026, and issued pursuant to the terms of the grant agreement. The reporting person's receipt of 1,361.820 shares of common stock was deferred resulting in the reporting person's receipt of 1,361.820 deferred stock units. The deferred stock units become payable in shares of common stock after the reporting person's termination of service, pursuant to the reporting person's distribution election.
F2 (Continued from footnote 1) The reporting person is therefore reporting the disposition of 1,361.820 shares of common stock in exchange for an equal number of deferred stock units. The reporting person had 61.527 shares withheld and cancelled in respect of taxes in connection with the vesting of the performance units.
F3 Restricted units awarded under Issuer's Amended and Restated Equity Compensation Plan (2018). 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 shares were issued pursuant to the terms of the grant agreement.
F4 Performance units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018). The award will vest on February 17, 2029, 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, 2026, through December 31, 2029, in accordance with the terms of the Performance Unit Award Agreement.
F5 Restricted units awarded under the Issuer's Amended and Restated Equity Compensation Plan (2018). The award vests on February 17, 2029, in accordance with the terms of the Restricted Unit Award Agreement.

Remarks:

Senior Vice President and Chief Financial Officer