Item 2.02 Results of Operations and Financial Condition On May 7,2026, GPGI, Inc. (the “ Company”) issued a press release announcing its financial results for the three m onths ended March 31, 2026, and provided an investor presentation to accompany the press release. Copies of the press release and the investor presentation are furnished herewith as Exhibits 99.1 and 99.2, respectively. In accordance with General Instruction B.2 of Form 8-K, the information in this Item 2.02 of this Current Report on Form 8-K, including Exhibits 99.1 and 99.2 hereto, which are furnished herewith pursuant to and relate to this Item 2.02, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “ Exchange Act”), or otherwise be subject to the liabilities of Section 18 of the Exchange Act. The information in this Item 2.02 of this Current Report on Form 8-K and Exhibits 99.1 and 99.2 hereto shall not be incorporated by reference into any filing or other document filed by the Company with the SEC pursuant to the Securities Act of 1933, as amended, the rules and regulations of the SEC thereunder, the Exchange Act, or the rules and regulations of the SEC thereunder except as shall be expressly set forth by specific reference in such filing or document.

Item 8.01 Other Events On May 6, 2026, the Company’s board of directors declared a quarterly cash dividend in the amount of $0.0025 per share of Class A common stock of the Company, payable on June 1, 2026 to all holders of record as of May 18, 2026.

Item 9.01 (d) Financial Statements and Exhibits Exhibit No. Exhibit Description 99.2 Investor Presentation of GPGI, Inc. dated May 7, 2026 ──────────────────────────────────────────────────────────────────────────────────────────────── 99.1 Press Release of GPGI, Inc. dated May 7. 2026 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized. GPGI, Inc. Date: May 7, 2026 By: /s/ Kurt Schoen Name: Kurt Schoen Title: Principal Financial Officer