X0202 SCHEDULE 13G/A 0002048763 XXXXXXXX LIVE 1 Class A Common Stock, par value $0.0001 per share 03/31/2026 0002035149 Flowco Holdings Inc. 342909108 1300 Post Oak Blvd. Suite 450 Houston TX 77056 Rule 13d-1(d) Fairbanks Jonathan B. a X1 17625 28985788 17625 28985788 29003413 N 41.3 IN HC 1. Sole voting power and sole dispositive power includes (i) an aggregate of 2,000 shares of Class A Common Stock owned by Mr. Fairbanks' children and (ii) 15,625 restricted stock units, each representing a contingent right to receive one share of Class A Common Stock, that vest in substantially equal quarterly installments over 3 years following the grant date of January 17, 2025. 2. Shared voting power and shared dispositive power includes (i) 14,980,623 Common Units (as defined below in Item 2) held directly by GEC Estis Co-Invest II LLC; (ii) 7,089,834 Common Units held directly by GEC Partners III LP; and (iii) 6,252,037 Common Units held directly by GEC Partners III-B LP. 3. Aggregate amount beneficially owned by each Reporting Person reported herein does not include shares of Class A Common Stock held by the Separately Filing Group Members, as further described in Item 8. GEC Advisors LLC a DE 0 28985788 0 28985788 28985788 N 41.3 OO 1. Shared voting power and shared dispositive power includes (i) 14,980,623 Common Units held directly by GEC Estis Co-Invest II LLC; (ii) 7,089,834 Common Units held directly by GEC Partners III LP; and (iii) 6,252,037 Common Units held directly by GEC Partners III-B LP. 2. Aggregate amount beneficially owned by each Reporting Person reported herein does not include shares of Class A Common Stock held by the Separately Filing Group Members, as further described in Item 8. GEC Group B Ltd a D0 0 21544056 0 21544056 21544056 N 34.2 OO 1. Shared voting power and shared dispositive power includes (i) 14,980,623 Common Units held directly by GEC Estis Co-Invest II LLC and (ii) 6,252,037 Common Units held directly by GEC Partners III-B LP. 2. Aggregate amount beneficially owned by each Reporting Person reported herein does not include shares of Class A Common Stock held by the Separately Filing Group Members, as further described in Item 8. GEC Capital Group III-B LP a D0 0 21544056 0 21544056 21544056 N 34.2 PN 1. Shared voting power and shared dispositive power includes (i) 14,980,623 Common Units held directly by GEC Estis Co-Invest II LLC and (ii) 6,252,037 Common Units held directly by GEC Partners III-B LP. 2. Aggregate amount beneficially owned by each Reporting Person reported herein does not include shares of Class A Common Stock held by the Separately Filing Group Members, as further described in Item 8. GEC Estis Co-Invest II LLC a DE 0 14980623 0 14980623 14980623 N 26.4 OO 1. Shared voting power and shared dispositive power consists of 14,980,623 Common Units held directly by the Reporting Person. 2. Aggregate amount beneficially owned by each Reporting Person reported herein does not include shares of Class A Common Stock held by the Separately Filing Group Members, as further described in Item 8. GEC Group Ltd a D0 0 7441732 0 7441732 7441732 N 15.2 OO 1. Shared voting power and shared dispositive power includes 7,089,834 Common Units held directly by GEC Partners III LP. 2. Aggregate amount beneficially owned by each Reporting Person reported herein does not include shares of Class A Common Stock held by the Separately Filing Group Members, as further described in Item 8. GEC Capital Group III LP a D0 0 7441732 0 7441732 7441732 N 15.2 PN 1. Shared voting power and shared dispositive power includes 7,089,834 Common Units held directly by GEC Partners III LP. 2. Aggregate amount beneficially owned by each Reporting Person reported herein does not include shares of Class A Common Stock held by the Separately Filing Group Members, as further described in Item 8. GEC Partners III LP a D0 0 7089834 0 7089834 7089834 N 14.5 PN 1. Shared voting power and shared dispositive power consists of 7,089,834 Common Units held directly by the Reporting Person. 2. Aggregate amount beneficially owned by each Reporting Person reported herein does not include shares of Class A Common Stock held by the Separately Filing Group Members, as further described in Item 8. GEC Partners III B LP a D0 0 6252037 0 6252037 6252037 N 13 PN 1. Shared voting power and shared dispositive power consists of 6,252,037 Common Units held directly by the Reporting Person. 2. Aggregate amount beneficially owned by each Reporting Person reported herein does not include shares of Class A Common Stock held by the Separately Filing Group Members, as further described in Item 8. Flowco Holdings Inc. 1300 Post Oak Blvd., Suite 450, Houston, Texas, 77056 Jonathan B. Fairbanks GEC Advisors LLC GEC Group B Ltd. GEC Capital Group III-B LP GEC Estis Co-Invest II LLC GEC Group Ltd. GEC Capital Group III LP GEC Partners III LP GEC Partners III-B LP (each, a "Reporting Persons" and, collectively, the "Reporting Persons") This statement on Schedule 13G (this "Statement") relates to the shares of Common A common stock, par value $0.0001 per share, of the Issuer ("Class A Common Stock") held by the Reporting Persons as well as the shares of Common A Common Stock that the Reporting Persons have the right to acquire upon exchange of the Paired Interests (as defined below in this Item 2). Each Common Unit of Flowco MergeCo (the "Common Unit") is paired with one share of Class B common stock of the Issuer ("Class B Common Stock", and together with the paired Common Unit, the "Paired Interest"). Pursuant to a Second Amended and Restated Limited Liability Company Agreement of Flowco MergeCo (the "Restated LLC Agreement"), each Paired Interest is exchangeable into one share of Class A Common Stock (or at the Issuer's election, cash based on the redemption rate set forth in the Restated LLC Agreement and the value of the Class A Common Stock at the time of the exchange), subject to the terms of the Restated LLC Agreement. Upon an exchange of the Paired Interests for Class A Common Stock, the corresponding number of shares of Class B Common Stock, which entitle its holder to one vote per share on all matters presented to the Issuer's stockholders generally, will be cancelled. The business address of each of the Reporting Persons is: 2415 W. Alabama St., Suite 220, Houston, Texas 77098. Jonathan B. Fairbanks, a citizen of the United States residing in Houston, Texas ("Mr. Fairbanks"). GEC Advisors LLC is a Delaware limited liability company; GEC Group B Ltd. is a Bermuda exempted company; GEC Capital Group III-B LP is a Bermuda exempted limited partnership; GEC Estis Co-Invest II LLC is a Delaware limited liability company; GEC Group Ltd. is a Bermuda exempted company; GEC Capital Group III LP is a Bermuda exempted limited partnership; GEC Partners III LP is a Bermuda exempted limited partnership; and GEC Partners III-B LP is a Bermuda exempted limited partnership (collectively, the "GEC Entities"). Y GEC Capital Group III LP is the general partner of each of GEC Partners III LP and GEC Partners III GI LP, the direct holder of 351,898 shares of Class A Common Stock. GEC Group Ltd. is the general partner of GEC Capital Group III LP. GEC Capital Group III-B LP is the managing member or general partner of each of GEC Estis Co-Invest II LLC, GEC Partners III-B LP and GEC Partners III-B GI LP, the direct holder of 311,396 shares of Class A Common Stock. GEC Group B Ltd. is the general partner of GEC Capital Group III-B LP. Mr. Fairbanks serves as a director on the Issuer's board of directors and is the manager and controlling member of GEC Group Ltd. and GEC Group B Ltd., as well as GEC Advisors LLC, a registered investment advisor to the funds that beneficially own such shares, with discretionary authority over each such fund's accounts. Jonathan B. Fairbanks: 29,003,413 GEC Advisors LLC: 28,985,788 GEC Group B Ltd.: 21,544,056 GEC Capital Group III-B LP: 21,544,056 GEC Estis Co-Invest II LLC: 14,980,623 GEC Group Ltd.: 7,441,732 GEC Capital Group III LP: 7,441,732 GEC Partners III LP: 7,089,834 GEC Partners III-B LP: 6,252,037 The percentage of each Reporting Person set forth herein is calculated based on 41,816,350 shares of Class A Common Stock outstanding following the Issuer's underwritten offering that closed on March 23, 2026, and after the underwriters exercised their option to purchase additional shares of Class A Common Stock in full, as reported on the Issuer's prospectus on Form 424B7, filed on March 20, 2026, plus the shares of Class A Common Stock that each Reporting Person has the right to acquire upon exchange of the Paired Interests, which amount has been added to the total shares of Class A Common Stock outstanding pursuant to Rule 13d-3(d)(1)(i) under the Act. Jonathan B. Fairbanks: 41.3% GEC Advisors LLC: 41.3% GEC Group B Ltd.: 34.2% GEC Capital Group III-B LP: 34.2% GEC Estis Co-Invest II LLC: 26.4% GEC Group Ltd.: 15.2% GEC Capital Group III LP: 15.2% GEC Partners III LP: 14.5% GEC Partners III-B LP: 13.0% Jonathan B. Fairbanks: 17,625 GEC Advisors LLC: 0 GEC Group B Ltd.: 0 GEC Capital Group III-B LP: 0 GEC Estis Co-Invest II LLC: 0 GEC Group Ltd.: 0 GEC Capital Group III LP: 0 GEC Partners III LP: 0 GEC Partners III-B LP: 0 Jonathan B. Fairbanks: 28,985,788 GEC Advisors LLC: 28,985,788 GEC Group B Ltd.: 21,544,056 GEC Capital Group III-B LP: 21,544,056 GEC Estis Co-Invest II LLC: 14,980,623 GEC Group Ltd.: 7,441,732 GEC Capital Group III LP: 7,441,732 GEC Partners III LP: 7,089,834 GEC Partners III-B LP: 6,252,037 Jonathan B. Fairbanks: 17,625 GEC Advisors LLC: 0 GEC Group B Ltd.: 0 GEC Capital Group III-B LP: 0 GEC Estis Co-Invest II LLC: 0 GEC Group Ltd.: 0 GEC Capital Group III LP: 0 GEC Partners III LP: 0 GEC Partners III-B LP: 0 Jonathan B. Fairbanks: 28,985,788 GEC Advisors LLC: 28,985,788 GEC Group B Ltd.: 21,544,056 GEC Capital Group III-B LP: 21,544,056 GEC Estis Co-Invest II LLC: 14,980,623 GEC Group Ltd.: 7,441,732 GEC Capital Group III LP: 7,441,732 GEC Partners III LP: 7,089,834 GEC Partners III-B LP: 6,252,037 Y N The response to Item 4(a) is incorporated by reference herein. Certain affiliates of the Reporting Persons are known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the shares of Class A Common Stock covered by this Statement that may be deemed to be beneficially owned by the Reporting Persons. N The response to Item 4(a) is incorporated by reference herein. N The Reporting Persons may be deemed to be members of a "group," within the meaning of Section 13(d)(3) of the Act, comprised of the Reporting Persons and the other persons referred to on Exhibit B attached to this Schedule 13G (the "Separately Filing Group Members"). It is the understanding of the Reporting Persons that the Separately Filing Group Members have filed or are filing separate statements pursuant to Section 13(d) of the Act and the rules promulgated thereunder. The Reporting Persons expressly disclaim beneficial ownership over any shares of Class A Common Stock that the Separately Filing Group Members may be deemed to beneficially own. Y Y Exhibit A - Joint Filing Agreement. Exhibit B - Separately Filing Group Members. Fairbanks Jonathan B. /s/ Jonathan B. Fairbanks 05/15/2026 GEC Advisors LLC /s/ Jonathan B. Fairbanks 05/15/2026 GEC Group B Ltd /s/ Jonathan B. Fairbanks 05/15/2026 GEC Capital Group III-B LP /s/ Jonathan B. Fairbanks 05/15/2026 GEC Estis Co-Invest II LLC /s/ Jonathan B. Fairbanks 05/15/2026 GEC Group Ltd /s/ Jonathan B. Fairbanks 05/15/2026 GEC Capital Group III LP /s/ Jonathan B. Fairbanks 05/15/2026 GEC Partners III LP /s/ Jonathan B. Fairbanks 05/15/2026 GEC Partners III B LP /s/ Jonathan B. Fairbanks 05/15/2026