{"schema_version":"secwatch.filing_event.v1","accession":"0001628280-26-059191","form_type":"8-K","ticker":"WTM","cik":"0000776867","company_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","filed_at":"2026-08-27T12:11:33+00:00","discovered_at":"2026-08-27T12:15:10.310567+00:00","generated_at":"2026-08-27T12:15:14.436905+00:00","sec_items":["5.02","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.3,"calibrated_materiality_score":0.3,"confidence":"high","headline":"White Mountains elects Stephen Klar to board; board expands to 11","bullets":["Stephen Klar elected director on Aug 26, 2026; board size increased from 10 to 11.","Klar is former President and Managing Partner of Wellington Management Group LLP.","Will serve until next annual meeting; receives standard non-employee director compensation.","CEO Liam Caffrey cited Klar's financial services experience as beneficial to owners."],"urls":{"canonical":"https://secwatch.observer/filing/0001628280-26-059191","json":"https://secwatch.observer/filing/0001628280-26-059191.json","markdown":"https://secwatch.observer/filing/0001628280-26-059191.md","text":"https://secwatch.observer/filing/0001628280-26-059191.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/776867/000162828026059191/0001628280-26-059191-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/776867/000162828026059191/wtm-20260826.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-08-27T12:15:14.436905+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":"5f1b08a8d7","claim":"Stephen Klar was elected as director at WHITE MOUNTAINS INSURANCE GROUP LTD.","evidence_excerpt":"On August 26, 2026, the Board of Directors (the “Board”) of White Mountains Insurance Group, Ltd. (the “Company”) elected Stephen Klar as a director of the Company.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/776867/000162828026059191/0001628280-26-059191-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"elected"},{"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"}