Trinseo(TSE) - 2025 Q1 - Quarterly Results

Exhibit 99.1 Contact: Bee van Kessel Tel: +41 44 718 3685 Email: bvankessel@trinseo.com Trinseo Reports First Quarter 2025 Financial Results and Provides Second Quarter Outlook First Quarter 2025 Highlights ● Net loss of $79 million and EPS of negative $2.22 included $25 million of refinancing costs for the debt transactions that closed in January 2025 ● Adjusted EBITDA* of $65 million was $20 million above prior year driven by $26 million of polycarbonate technology licensing income as well as savings from ...