{"schema_version":"secwatch.filing_event.v1","accession":"0000776867-24-000002","form_type":"8-K","ticker":"WTM","cik":"0000776867","company_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","filed_at":"2024-01-03T23:59:59+00:00","discovered_at":"2026-05-14T18:03:26.902535+00:00","generated_at":"2026-06-07T04:56:56.303668+00:00","sec_items":["8.01"],"event_type":"m_and_a","sentiment":"neutral","materiality_score":0.7,"calibrated_materiality_score":0.7,"confidence":"high","headline":"White Mountains closes acquisition of 72.8% of Bamboo IDE8 for $296.7M","bullets":["Closed merger and primary investment in Bamboo IDE8 Insurance Services on January 2, 2024.","Acquired approximately 72.8% of Bamboo's equity for $296.7 million in cash.","Transaction completed through indirect subsidiaries PM Holdings and WM Pierce Merger Sub.","Bamboo becomes a consolidated subsidiary of White Mountains."],"urls":{"canonical":"https://secwatch.observer/filing/0000776867-24-000002","json":"https://secwatch.observer/filing/0000776867-24-000002.json","markdown":"https://secwatch.observer/filing/0000776867-24-000002.md","text":"https://secwatch.observer/filing/0000776867-24-000002.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/776867/000077686724000002/0000776867-24-000002-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/776867/000077686724000002/wtm-20240102.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-07T04:56:56.303668+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"}