{"schema_version":"secwatch.filing_event.v1","accession":"0000776867-25-000015","form_type":"8-K","ticker":"WTM","cik":"0000776867","company_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","filed_at":"2025-09-02T23:59:59+00:00","discovered_at":"2026-05-14T18:02:46.353882+00:00","generated_at":"2026-05-17T09:05:11.876536+00:00","sec_items":["5.02","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.65,"calibrated_materiality_score":0.65,"confidence":"high","headline":"White Mountains CEO Manning Rountree to retire Dec 31, 2025; Liam Caffrey to succeed","bullets":["Manning Rountree to retire as CEO and board member on Dec 31, 2025; becomes Senior Advisor through Jan 1, 2028.","Liam Caffrey, currently President and CFO, becomes CEO on Jan 1, 2026 and joins the board.","Michael Papamichael succeeds Caffrey as CFO; Giles Harrison becomes President, both effective Jan 1, 2026.","Rountree to receive $600K cash bonus for 2025 plus $300K annual salary as Senior Advisor; remains eligible for LTIP.","Board Compensation Committee approved letter agreement with Rountree including restrictive covenants and mutual release."],"urls":{"canonical":"https://secwatch.observer/filing/0000776867-25-000015","json":"https://secwatch.observer/filing/0000776867-25-000015.json","markdown":"https://secwatch.observer/filing/0000776867-25-000015.md","text":"https://secwatch.observer/filing/0000776867-25-000015.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/776867/000077686725000015/0000776867-25-000015-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/776867/000077686725000015/wtm-20250902.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-17T09:05:11.876536+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":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}