Trinseo PLC Reports 2026 AGM Results; Directors Elected, PwC Ratified

What Happened
Trinseo PLC announced the results of its adjourned 2026 Annual General Meeting of Shareholders held on September 30, 2026 (originally set for Sept 23, 2026). A quorum was established with 491,031 shares present or represented by proxy, and shareholders approved the election of eleven director nominees to serve until the 2027 annual meeting. Shareholders also approved, on an advisory basis, the compensation of the company’s named executive officers and ratified PricewaterhouseCoopers LLP as the company’s independent registered public accounting firm for the year ending December 31, 2026. The meeting — and an Extraordinary General Meeting convened under Section 1111 of the Irish Companies Act 2014 — had been adjourned from Sept 23 due to lack of a quorum; the Extraordinary General Meeting had no resolutions presented or voted on.

Key Details

• Quorum and attendance: 491,031 shares present or represented by proxy at the adjourned AGM (constituted quorum under Article 88).
• Directors elected (terms expiring at the end of the 2027 annual meeting): K’Lynne Johnson; Joseph Alvarado; Frank Bozich; Victoria Brifo; Jeffrey Cote; Jeanmarie Desmond; Matthew Farrell; Carol Flaton; Jill Frizzley; Sandra Beach Lin; Henri Steinmetz. All 11 nominees were approved.
• Advisory executive compensation vote: For 488,146; Against 2,885; Abstain 0.
• Auditor ratification: PricewaterhouseCoopers LLP ratified by vote of 491,031 For, 0 Against, 0 Abstain.
• Extraordinary General Meeting: Convened under Irish law (Section 1111) related to net assets; no resolutions were proposed or acted upon.

Why It Matters
These voting outcomes confirm the board composition for the coming year and give shareholders an advisory endorsement of the company’s executive pay practices. Ratification of PwC as auditor finalizes the external auditor for Trinseo’s 2026 year-end audit. The Extraordinary General Meeting’s lack of action is notable only insofar as it was convened under Irish company law regarding the company’s capital/net-asset position; shareholders were presented with no measures at that meeting. Investors tracking governance, board continuity, or auditor matters can treat these items as resolved per the votes disclosed.

Filed and signed by Angelo Chaclas, Senior Vice President and Chief Legal Officer, dated September 30, 2026.