Exhibit 99.1 Ecovyst Reports Second Quarter 2025 Results WAYNE, PA, August 7, 2025 -- Ecovyst Inc. (NYSE: ECVT) ("Ecovyst" or the "Company"), a leading integrated and innovative global provider of advanced materials, specialty catalysts, virgin sulfuric acid and sulfuric acid regeneration services, today reported results for the second quarter ended June 30, 2025. Second Quarter 2025 Results & Highlights "We are pleased with our results for the second quarter of 2025. With demand fundamentals generally in l ...