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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Name of Issuer)

(Title of Class of Securities)

(CUSIP Number)

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13D/A 0001999371-26-000410 0001360554 XXXXXXXX LIVE 5 Common Stock, par value $0.01 per share 01/22/2026 false 0001084991 63886Q109 Natural Gas Services Group Inc 404 VETERANS AIRPARK LANE SUITE 300 MIDLAND TX 79705 Hoak Public Equities, LP (214) 855-2284 3963 Maple Avenue, Suite 450 Dallas TX 75219 0001360554 N Hoak Public Equities, LP a WC N TX 575000.00 0.00 575000.00 0.00 575000.00 N 4.57 PN *This calculation is based on 12,568,917 shares of Common Stock of the Issuer outstanding as of November 7, 2025, as disclosed on the Issuer's Form 10-Q filed with the SEC on November 10, 2025. This filing constitutes an exit filing as the Reporting Persons have ceased to be the beneficial owners of more than 5 percent of the referenced class of securities. 0001607736 N Hoak Fund Management, L.P. a AF N TX 575000.00 0.00 575000.00 0.00 575000.00 N 4.57 PN *This calculation is based on 12,568,917 shares of Common Stock of the Issuer outstanding as of November 7, 2025, as disclosed on the Issuer's Form 10-Q filed with the SEC on November 10, 2025. This filing constitutes an exit filing as the Reporting Persons have ceased to be the beneficial owners of more than 5 percent of the referenced class of securities. 0001607735 N Hoak & Co. a AF N TX 575000.00 0.00 575000.00 0.00 575000.00 N 4.57 CO *This calculation is based on 12,568,917 shares of Common Stock of the Issuer outstanding as of November 7, 2025, as disclosed on the Issuer's Form 10-Q filed with the SEC on November 10, 2025. This filing constitutes an exit filing as the Reporting Persons have ceased to be the beneficial owners of more than 5 percent of the referenced class of securities. Y J. Hale Hoak a AF N X1 575000.00 0.00 575000.00 0.00 575000.00 N 4.57 IN *This calculation is based on 12,568,917 shares of Common Stock of the Issuer outstanding as of November 7, 2025, as disclosed on the Issuer's Form 10-Q filed with the SEC on November 10, 2025. This filing constitutes an exit filing as the Reporting Persons have ceased to be the beneficial owners of more than 5 percent of the referenced class of securities. Y James M. Hoak a AF N X1 575000.00 0.00 575000.00 0.00 575000.00 N 4.57 IN *This calculation is based on 12,568,917 shares of Common Stock of the Issuer outstanding as of November 7, 2025, as disclosed on the Issuer's Form 10-Q filed with the SEC on November 10, 2025. This filing constitutes an exit filing as the Reporting Persons have ceased to be the beneficial owners of more than 5 percent of the referenced class of securities. Common Stock, par value $0.01 per share Natural Gas Services Group Inc 404 VETERANS AIRPARK LANE SUITE 300 MIDLAND TX 79705 This Amendment No. 5 to Schedule 13D ("Amendment No. 5") amends and supplements the Schedule 13D originally filed with the Securities and Exchange Commission ("SEC") on November 28, 2022 (the "Original 13D") and Amendment No. 1 to the statement on Schedule 13D filed with the Securities and Exchange Commission on December 9, 2022 ("Amendment No. 1") and Amendment No. 2 to the statement on Schedule 13D filed with the Securities and Exchange Commission on December 30, 2022 ("Amendment No. 2") and Amendment No. 3 to the statement on Schedule 13D filed with the Securities and Exchange Commission on January 11, 2023 ("Amendment No. 3") and Amendment No. 4 to the statement on Schedule 13D filed with the Securities and Exchange Commission on January 7, 2026 ("Amendment No. 4") and together with the Original 13D, Amendment No. 1, Amendment No. 2, Amendment No. 3, Amendment No. 4, and this Amendment No. 5, the "Schedule 13D"). Unless otherwise indicated, all capitalized terms used but not defined herein shall have the same meaning ascribed to them in the Original 13D. As set forth below, as a result of the transactions described herein, the Reporting Persons have ceased to be the beneficial owner of more than five percent of the Common Stock of the Issuer. The filing of this Amendment No. 5 represents the final amendment to the Original 13D and constitutes an exit filing for the Reporting Persons. Item 3 is hereby amended and restated to read in its entirety as follows: "The cost basis of the 575,000 shares of Common Stock currently reported on this filing is $6,112,250.00. All of the shares of Common Stock beneficially owned by HPE were paid for using working capital of HPE. Hoak Management does not directly hold any Common Stock but may be deemed to beneficially own the Common Stock owned by HPE. The other Reporting Persons do not hold shares of Common Stock directly but may be deemed to beneficially own the Common Stock owned by HPE." Item 5(a) is hereby amended and restated to read in its entirety as follows: "As of the date of this Schedule 13D, based upon 12,568,917 shares of Common Stock outstanding (as disclosed on the Issuer's Form 10-Q filed with the SEC November 10, 2025): (a) HPE directly owns an aggregate of 575,000 shares of Common Stock, representing approximately 4.57% of the outstanding Common Stock; (b) Hoak Management, in its capacity as HPE's general partner, may be deemed to beneficially own an aggregate of 575,000 shares of Common Stock, representing approximately 4.57% of the outstanding Common Stock; and (c) each of Hoak and Co. (in its capacity as the general partner of Hoak Management), James M. Hoak (in his capacity as Hoak & Co.'s controlling shareholder), and J. Hale Hoak (in his capacity as Hoak & Co.'s President) may be deemed to beneficially own an aggregate of 575,000 shares of Common Stock, representing approximately 4.57% of the outstanding Common Stock." Item 5(c) is hereby amended and restated in its entirety as follows: "Schedule A hereto sets forth all transactions in the Common Stock by any Reporting Person since the most recent Schedule 13D filed with the SEC on January 7, 2026. Except for the transactions set forth on Schedule A, none of the Reporting Persons effected any transaction since the most recent Schedule 13D filed with the SEC on January 7, 2026." Item 5(e) is hereby amended and restated to read in its entirety as follows: "As a result of the transactions described herein, on January 26, 2026, the Reporting Persons ceased to be the beneficial owner of more than five percent (5%) of the Common Stock of the Issuer based on the number of shares of Common Stock outstanding as reported by the Issuer on November 10, 2025. The filing of this Amendment represents the final amendment to the Schedule 13D and constitutes an exit filing for the Reporting Persons." Exhibit 99.1 Joint Filing Agreement dated January 26, 2026, by and among Hoak Public Equities, L.P., Hoak Fund Management, L.P., Hoak & Co., James M. Hoak and J. Hale Hoak. Exhibit 99.2 Schedule A Transactions - Since Most Recent Schedule 13D Filed January 7, 2026 Hoak Public Equities, LP /s/ J. Hale Hoak J. Hale Hoak, President (Hoak Fund Management, L.P., its general partner) (Hoak & Co., its general partner) 01/26/2026 Hoak Fund Management, L.P. /s/ J. Hale Hoak J. Hale Hoak, President (Hoak & Co., its general partner) 01/26/2026 Hoak & Co. /s/ J. Hale Hoak J. Hale Hoak, President 01/26/2026 J. Hale Hoak /s/ J. Hale Hoak J. Hale Hoak 01/26/2026 James M. Hoak /s/ James M. Hoak James M. Hoak 01/26/2026