Trinseo board members De Leener and Tomkins retire; board to shrink to nine

Trinseo PLC

Pierre-Marie De Leener and Mark Tomkins will retire at 2025 AGM and not stand for reelection.
Board size will decrease to nine members following the annual general meeting.
De Leener served since Trinseo's 2014 IPO; Tomkins served since 2019.
Retirements not due to any disagreement with the company on operations or policies.

item 5.02 item 9.01

Executive movements

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Departed

Mark Tomkins

Director

TSEOF · Trinseo PLC

Filed: April 4, 2025, 7:59 PM ET

Pierre-Marie De Leener and Mark Tomkins, two members of the Board of Directors (the “Board”) of Trinseo PLC (the “Company”), notified the Company of their decision to retire from the Board and not stand for reelection at the Company’s 2025 annual general meeting of shareholders.

Departed

Pierre-Marie De Leener

Director

TSEOF · Trinseo PLC

Filed: April 4, 2025, 7:59 PM ET

Pierre-Marie De Leener and Mark Tomkins, two members of the Board of Directors (the “Board”) of Trinseo PLC (the “Company”), notified the Company of their decision to retire from the Board and not stand for reelection at the Company’s 2025 annual general meeting of shareholders.

Key facts

Extracted from this filing and checked against the source text.

Executive change SEC 8-K Item 5.02 confidence 0.95

Mark Tomkins departed as Director at Trinseo PLC.

Action: retire
Role: Director

Exact text from the filing

Pierre-Marie De Leener and Mark Tomkins, two members of the Board of Directors (the “Board”) of Trinseo PLC (the “Company”), notified the Company of their decision to retire from the Board and not stand for reelection at the Company’s 2025 annual general meeting of shareholders.

View on SEC.gov

Executive change SEC 8-K Item 5.02 confidence 0.95

Pierre-Marie De Leener departed as Director at Trinseo PLC.

Action: retire
Role: Director

Exact text from the filing

Pierre-Marie De Leener and Mark Tomkins, two members of the Board of Directors (the “Board”) of Trinseo PLC (the “Company”), notified the Company of their decision to retire from the Board and not stand for reelection at the Company’s 2025 annual general meeting of shareholders.

View on SEC.gov

Trinseo PLC filing history →

Source: SEC EDGAR

accession 0001558370-25-004485

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