PFAEFFIKON, Switzerland – July 2, 2025 – Trinseo (NYSE: TSE), a specialty material solutions provider, and its affiliate companies in Europe announced today a price decrease for all polystyrene (PS) grades. Effective July 1, 2025, or depending on existing contract terms, the prices for the products listed below will decrease as follows:

• STYRON™ and STYRON™ X-TECH general purpose polystyrene grades (GPPS) by -60 Euro per metric ton
• STYRON™ and STYRON™ A-TECH, STYRON™ C-TECH and STYRON™ X- TECH high impact polystyrene grades (HIPS) by -60 Euro per metric ton

About Trinseo

Trinseo (NYSE: TSE), a specialty material solutions provider, partners with companies to bring ideas to life in an imaginative, smart, and sustainably focused manner by combining its premier expertise, forward-looking innovations, and best-in-class materials to unlock value for companies and consumers. From design to manufacturing, Trinseo taps into decades of experience in diverse material solutions to address customers’ unique challenges in a wide range of industries, including building and construction, consumer goods, medical and mobility.

Trinseo’s employees bring endless creativity to reimagining the possibilities with clients all over the world from the company’s locations in North America, Europe, and Asia Pacific. Trinseo reported net sales of approximately $3.5 billion in 2024. Discover more by visiting http://www.trinseo.com/ and connecting with Trinseo on LinkedIn, X, Facebook and WeChat.