TSE TRINSEO PLC Management Changes 8-K Filing 2025 - Board Changes On April 3, 2025, Pierre-Marie De Leener and Mark Tomkins announced their retirement from Trinseo PLC's Board of Directors and will not seek reelection at the 2025 annual meeting, reducing the Board size to nine members. Their retirement was not due to any disagreements with the Company.Get access to all SEC 8-K filings of the TRINSEO PLC