Exhibit 99.1 RPM Reports Record Fiscal 2026 First-Quarter Results MEDINA, OH – October 1, 2025 – RPM International Inc. (NYSE: RPM), a world leader in specialty coatings, sealants and building materials, today reported record financial results for its fiscal 2026 first quarter ended August 31, 2025. Frank C. Sullivan, RPM chairman and CEO commented, "Our associates' focused pivot to growth was evident during the quarter with organic sales up solidly in a challenging macro environment. We leveraged our abili ...