Trinseo PLC Adjourns Annual and Extraordinary Shareholder Meetings to Sept 30, 2026

What Happened
Trinseo PLC filed an 8‑K on September 23, 2026 announcing that both its 2026 Annual General Meeting and an Extraordinary General Meeting were adjourned because a quorum was not present. The Chair adjourned the Annual Meeting to September 30, 2026 at 8:30 a.m. EST and the Extraordinary General Meeting to September 30, 2026 at 8:45 a.m. EST. The meetings will be held at 440 E. Swedesford Rd., Suite 301, Wayne, PA, with audio/video access for shareholders in Ireland at McCann FitzGerald LLP in Dublin.

Key Details

• Annual Meeting adjourned to: September 30, 2026 at 8:30 a.m. EST; only shareholders of record as of close of business July 30, 2026 may vote or attend.
• Extraordinary General Meeting adjourned to: September 30, 2026 at 8:45 a.m. EST; only shareholders of record as of close of business August 12, 2026 may attend.
• No changes to the proposals to be voted at the adjourned Annual Meeting.
• No resolutions or substantive matters will be presented or voted on at the adjourned Extraordinary General Meeting.
• Report signed by Angelo Chaclas, Senior VP & Chief Legal Officer, on September 23, 2026.

Why It Matters
Adjournment delays any shareholder voting outcomes and extends the timeline for matters requiring shareholder approval. Investors should note the applicable record dates for who is eligible to vote or attend the rescheduled meetings and that the Extraordinary General Meeting will not consider any substantive items. No new proposals or changes were announced in this filing.