Exhibit 99.1 FOR IMMEDIATE RELEASE Compass Minerals Reports Fiscal 2025 Third-Quarter Results OVERLAND PARK, Kan. (Aug. 11, 2025) - Compass Minerals (NYSE: CMP), a leading global provider of essential minerals, today reported fiscal 2025 third-quarter results. Unless otherwise noted, it should be assumed that time periods referenced below are on a fiscal-year basis. MANAGEMENT COMMENTARY "Compass Minerals had a strong third quarter that saw year-over-year improvement on a number of performance measures," sa ...