Exhibit 99.1 Greif Reports Fiscal Third Quarter 2025 Results DELAWARE, Ohio (August 27, 2025) – Greif, Inc. (NYSE: GEF, GEF.B), a global leader in industrial packaging products and services, today announced fiscal third quarter 2025 results. As previously announced, on June 30, 2025, we entered into a definitive agreement to divest our containerboard business, including our CorrChoice sheet feeder system (the "Containerboard Business"), in an all-cash transaction for $1.8 billion to Packaging Corporation of ...