Exhibit 99.1 International Paper Reports Third Quarter 2025 Results MEMPHIS, Tenn. – October 30, 2025 – International Paper (NYSE: IP; LSE: IPC) (the "Company") today reported third quarter 2025 earnings (loss) from continuing operations of $(426) million and adjusted operating earnings (loss) (non-GAAP) of$(224) million. Third quarter 2025 earnings (loss) from continuing operations and adjusted operating earnings (loss) (non-GAAP) include $675 million of accelerated deprecation associated with our mill cl ...