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SCHEDULE 13D/A Filed 2026-08-21 Event 2026-08-19 SEC 0001104659-26-099781 →

GREP GP III, LLC → Granite Ridge Resources, Inc. GRNT

Stake: 39.20% Shares: 51,648,048 CUSIP: 387432107 Class: Common Stock par value $0.0001 per share

Item 4 — Purpose of Transaction

Item 4 of the Schedule 13D is hereby amended and supplemented as provided below. Distribution On August 19, 2026, the Fund III Filing Parties effected a pro rata distribution of an aggregate of 14,000,000 shares of Common Stock to their respective limited partners and members, consisting of 4,247,600 shares distributed by Holdco III-A and 9,752,400 shares distributed by Holdco III-B. Voting Agreement On August 25, 2023, GREP GP III (who had voting and dispositive power over Common Stock owned by Fund III and certain of its affiliates), GREP GP II (who had voting and dispositive power over Common Stock owned by Fund II and certain of its affiliates), and Matthew Miller, Griffin Perry, Thaddeus Darden and Kirk Lazarine (collectively, the "Voting Agreement Parties") entered into a Stockholder Voting Agreement (the "Voting Agreement"). Pursuant to the Voting Agreement, the Voting Agreement Parties irrevocably and unconditionally agreed to vote the 75,957,927 shares of Common Stock which the Voting Agreement Parties then held (and any other shares of Common Stock obtained by Voting Agreement Parties in the future) at any annual or special meeting of the Company's stockholders or in connection with any written consent of the Company's stockholders. During the period it was in effect, the Voting Agreement continued indefinitely, but could be terminated on 30 days prior written notice by Voting Agreement Parties holding a majority of the shares of Common Stock subject to the Voting Agreement. In connection with their entry into the Voting Agreement, the Voting Agreement Parties provided GREP GP III an irrevocable voting proxy to vote the shares subject to the Voting Agreement. Additionally, during the term of such agreement, the Voting Agreement Parties agreed not to transfer the shares covered by the Voting Agreement without the consent of GREP GP III, except pursuant to certain limited exceptions. The description of the Voting Agreement contained in this Item 4 is not intended to be complete and is qualified in its entirety by reference to such agreement, which is filed as an exhibit hereto and incorporated by reference herein. Termination of Voting Agreement Effective August 19, 2026, the Voting Agreement Parties terminated the Stockholder Voting Agreement dated August 25, 2023, and it is no longer in effect. As a result, the irrevocable proxy in favor of GREP GP III and the transfer restrictions thereunder have terminated. Open Market Acquisitions and Vesting of Restricted Stock On September 18, 2023, the following Filing Parties made open market acquisitions of shares of Common Stock: Matthew Miller acquired 17,284 shares at prices ranging from $5.73 to $5.85 per share; Griffin Perry acquired 2,000 shares at a price of $5.76 per share, Thaddeus Darden acquired 20,000 shares at a price of $5.74 per share, and Kirk Lazarine acquired 10,000 shares at a price of $5.75 per share. On November 30, 2023, Thaddeus Darden acquired 10,000 shares at a price of $5.92 per share. On December 4, 2023, the following Filing Parties made open market acquisitions of shares of Common Stock: Griffin Perry acquired 3,000 shares at a price of $5.89 per share, and Thaddeus Darden acquired 10,000 shares at a price of $5.80 per share. On December 12, 2023, Matthew Miller acquired 2,600 shares at a price of $5.93 per share. On January 3, 2024, pursuant to an award of restricted stock granted to each of the Company's director under the Company's 2022 Omnibus Incentive Plan, 8,813 shares of restricted Common Stock issued to each of Matthew Miller, Griffin Perry, Thaddeus Darden, and Kirk Lazarine vested. On March 14, 2025 and March 15, 2024, Matthew Miller acquired a total of 4,900 shares at prices ranging from $6.20 to $6.22 per share. On May 23, 2024, Griffin Perry acquired 2,000 shares at a price of $6.54 per share. On June 3, 2024 through June 17, 2024, Matthew Miller acquired a total of 16,683 shares at prices ranging from $5.90 to $6.50 per share. On June 6, 2024, Thaddeus Darden acquired 3,000 shares at a price of $6.29. On June 14, 2024, Thaddeus Darden acquired 7,000 shares at a price of $5.90 per share. On August 16, 2024, Matthew Miller acquired 4,938 shares at a price of $6.50 per share. On August 22, 2024, Matthew Miller acquired 4,000 shares at a price of $6,33 per share. On September 11, 2024, Matthew Miller acquired 8,500 shares at a price of $5.97 per share. On September 13, 2024, Matthew Miller acquired 495 shares at a price of $6.23 per share. On September 12, 2024, Griffin Perry acquired 5,000 shares at a price of $6.13 per share. On November 20, 2024, Matthew Miller acquired 18,173 shares at prices ranging from $6.47 to $6.53 per share. On November 21, 2024, Matthew Miller acquired 20,327 shares at prices ranging from $6.59 to $6.63 per share. On December 6, 2024, the following Filing Parties made open market acquisitions of shares of Common Stock: Thaddeus Darden acquired 9,440 shares at prices ranging from $6.10 to $

Cross-References

Insider Activity (last 365d)
2 transactions
2 buys · 0 sales · 0 awards/exercises
Issuer Cluster
4 13D/G filings on this issuer
3 other filings besides this one
Filer Track Record
3 filings by this filer
2 other filings in the data moat
Short Interest · settle 2026-09-30
DTC 3.83
5,395,943 shares short · -9.3% vs prior

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
2026-08-13 MCCARTNEY JOHN director Buy 2,000 $5.00 $10K
2026-06-09 Miller Matthew Reade director Buy 10,600 $4.75 $50K

Other 13D/G Filings on Granite Ridge Resources, Inc.

FiledFormFilerStakeShares
2026-09-04 SCHEDULE 13D/A GREP GP III, LLC 39.20% 51,648,048 view →
2026-08-10 SCHEDULE 13D/A GREP GP III, LLC — 65,869,219 view →
2023-02-21 SC GREP GP II, LLC — — view →

Other Filings by GREP GP III, LLC

FiledFormIssuerStakeShares
2026-09-04 SCHEDULE 13D/A Granite Ridge Resources, Inc. 39.20% 51,648,048 view →
2026-08-10 SCHEDULE 13D/A Granite Ridge Resources, Inc. — 65,869,219 view →

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