Item 9.01 (d) Financial Statements and Exhibits Exhibit Exhibit No. Description 99.1 Press Release of GPGI, Inc. dated March 12, 2026 99.2 Investor Presentation of GPGI, Inc. dated March 12, 2026 ────────────────────────────────────────────────────────────────────────────────────── 104 Cover 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: March 12, 2026 By: /s/ Kurt Schoen Name: Kurt Schoen Title: Principal Financial Officer