Exhibit 99.1 Constellium Reports Second Quarter and First Half 2025 Results; Raises Full Year 2025 Guidance Paris - Constellium SE (NYSE: CSTM) ("Constellium" or the "Company") today reported results for the second quarter and the first half ended June 30, 2025. Second quarter 2025 highlights: > Includes negative non-cash metal price lag impact of $13 million Investor Relations Communications July 29, 2025 First half 2025 highlights: Media Contacts Jason Hershiser Delphine Dahan-Kocher Phone: +1 443 988-060 ...