CURTIS DINAN - 14 Feb 2026 Form 4 Insider Report for ONE Gas, Inc. (OGS)

Role
Senior Vice President and Chief Operating Officer
Signature
/s/ Brian K. Shore, Attorney-in-Fact for Curtis L. Dinan
Issuer symbol
OGS
Transactions as of
14 Feb 2026
Net transactions value
+$656,419
Form type
4
Filing time
19 Feb 2026, 16:15:12 UTC
Previous filing
20 Feb 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
DINAN CURTIS Senior Vice President and Chief Operating Officer 15 E. 5TH STREET, TULSA /s/ Brian K. Shore, Attorney-in-Fact for Curtis L. Dinan 19 Feb 2026 0001278745

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 $464,157 +5,395 +3.9% $86.04 143,701 16 Feb 2026 Direct F1
transaction OGS Common stock, par value $0.01 Tax liability $209,726 -2,438 -1.7% $86.04 141,263 16 Feb 2026 Direct F1
transaction OGS Common stock, par value $0.01 Options Exercise $152,635 +1,774 +1.3% $86.04 143,037 14 Feb 2026 Direct F2
transaction OGS Common stock, par value $0.01 Tax liability $66,931 -778 -0.54% $86.04 142,259 14 Feb 2026 Direct F2
holding OGS Common stock, par value $0.01 5,909 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 $547,042 -6,358 -100% $86.04 0 16 Feb 2026 Common stock, par value $0.01 6,358 Direct F1
transaction OGS Restricted Units 2023 Options Exercise $136,718 -1,589 -100% $86.04 0 14 Feb 2026 Common stock, par value $0.01 1,589 Direct F2
transaction OGS Performance Units 2026 Award $600,043 +6,974 $86.04 6,974 16 Feb 2026 Common stock, par value $0.01 6,974 Direct F3
transaction OGS Restricted Units 2026 Award $400,000 +4,649 $86.04 4,649 16 Feb 2026 Common stock, par value $0.01 4,649 Direct F4
* 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 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.
F2 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.
F3 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.
F4 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 Operating Officer