Trinseo Adjourns Annual Shareholder Meeting to November 20, 2026

• Trinseo adjourned its annual shareholder meeting from Sept. 30, 2026, to Nov. 20, 2026, at 9 a.m. EST.
• The delay allows presentation of audited financial statements for the fiscal year ended Dec. 31, 2025.
• No proposals will be voted on; business is limited to presenting the financial statements, including related directors’ and auditors’ reports.
• The meeting will be held in Wayne, Pennsylvania. Only shareholders of record at the close of business July 30, 2026, may attend.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Trinseo plc published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001104659-26-119031), on October 27, 2026, and is solely responsible for the information contained therein.