Sec Form 4 Filing - Knott Thomas R. @ GPGI, Inc. - 2026-03-17

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Knott Thomas R. 2. Issuer Name and Ticker or Trading Symbol GPGI, Inc. [ GPGI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner X __ Officer (give title below) _____ Other (specify below) See remarks (Last) (First) (Middle) C/O GPGI, INC., 309 PIERCE STREET 3. Date of Earliest Transaction (MM/DD/YY) 03/17/2026 (Street) SOMERSET, NJ08873 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 03/17/2026 P 44,000 A $ 17.08 ( 1 ) 44,000 D Class A Common Stock 879,963 I See footnote ( 2 ) Class A Common Stock 49,290,409 I See footnote ( 3 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Knott Thomas R. C/O GPGI, INC. 309 PIERCE STREET SOMERSET, NJ08873 X X See remarks Signatures /s/ Thomas R. Knott 03/18/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $16.90 to $17.28 inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote. ( 2 )The securities of the issuer are or may be deemed to be beneficially owned by (i) Tungsten 2024 LLC ("Tungsten"), directly, (ii) John Cote, indirectly as a result of being the manager of Tungsten, (iii) C 323 Holdings, LLC ("C 323 Holdings"), indirectly as a result of its consultation rights with respect to the shares, and (iv) Thomas Knott, indirectly as a result of being the sole and managing member of C 323 Holdings. Each of Tungsten, C 323 Holdings and Messrs. Cote and Knott disclaim beneficial ownership of any securities reported by any person except to the extent of their pecuniary interest therein. ( 3 )The securities of the Issuer are or may be deemed to be beneficially owned by (i) Resolute Compo Holdings LLC ("Resolute Compo Holdings"), directly, (ii) Tungsten, indirectly as a result of being the managing member of Resolute Compo Holdings, (iii) Mr. John Cote, indirectly as a result of being the manager of Tungsten, (iv) C 323 Holdings, indirectly as a result of its consultation rights with respect to the shares, and (v) Mr. Knott, indirectly as a result of being the sole and managing member of C 323 Holdings. Each of Resolute Compo Holdings, Tungsten, C 323 Holdings and Messrs. Cote and Knott disclaim beneficial ownership of any securities reported by any person except to the extent of their pecuniary interest therein.

Remarks: Principal executive officer and Chief Investment Officer

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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