• Trinseo ordinary shares were delisted from NYSE on March 2, 2026.
• Depository Trust Company removed Trinseo shares from its system following the NYSE delisting.
• Book-entry positions previously held at DTC were transferred to brokers, custodians, or nominees, then reflected directly on register maintained by Computershare.
• Share ownership remained unchanged, with Trinseo describing move as an administrative custody process rather than a corporate action.
• Brokers can keep holding shares for clients or transfer holdings to underlying clients, with transfers typically completing in 5-7 business days once valid documentation is received.

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 on April 10, 2026, and is solely responsible for the information contained therein.