{"schema_version":"secwatch.filing_event.v1","accession":"0001558370-23-006154","form_type":"8-K","ticker":"TSEOF","cik":"0001519061","company_name":"Trinseo PLC","filed_at":"2023-04-18T23:59:59+00:00","discovered_at":"2026-05-14T18:03:39.211032+00:00","generated_at":"2026-06-17T00:41:56.185496+00:00","sec_items":["5.02","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.4,"calibrated_materiality_score":0.4,"confidence":"high","headline":"Trinseo board members Misheff and Martens to retire, not stand for reelection","bullets":["Donald Misheff and Philip Martens notified Board of retirement from Board effective at 2023 annual meeting.","Board size expected to decrease from current number to eleven members after annual meeting.","Retirements not due to any disagreement with Company on operations, controls, or policies.","Misheff served since 2015; Martens since 2016; both thanked for service."],"urls":{"canonical":"https://secwatch.observer/filing/0001558370-23-006154","json":"https://secwatch.observer/filing/0001558370-23-006154.json","markdown":"https://secwatch.observer/filing/0001558370-23-006154.md","text":"https://secwatch.observer/filing/0001558370-23-006154.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1519061/000155837023006154/0001558370-23-006154-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1519061/000155837023006154/tse-20230413x8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-17T00:41:56.185496+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"4e3160ae90","claim":"Donald Misheff departed as Director at Trinseo PLC.","evidence_excerpt":"On April 13, 2023, Donald Misheff and Philip Martens, 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 2023 annual general meeting of shareholders.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1519061/000155837023006154/0001558370-23-006154-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"retire"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"},{"claim_id":"4e96744a9e","claim":"Philip Martens departed as Director at Trinseo PLC.","evidence_excerpt":"On April 13, 2023, Donald Misheff and Philip Martens, 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 2023 annual general meeting of shareholders.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1519061/000155837023006154/0001558370-23-006154-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"retire"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}