{"schema_version":"secwatch.filing_event.v1","accession":"0000776867-23-000016","form_type":"8-K","ticker":"WTM","cik":"0000776867","company_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","filed_at":"2023-11-06T23:59:59+00:00","discovered_at":"2026-05-14T18:03:31.986921+00:00","generated_at":"2026-06-08T21:39:34.658843+00:00","sec_items":["2.02","9.01"],"event_type":"earnings","sentiment":"neutral","materiality_score":0.8,"calibrated_materiality_score":0.8,"confidence":"high","headline":"White Mountains Q3 ABVPS up 1% to $1,588; acquires Bamboo, launches WM Partners","bullets":["Book value per share $1,542, adjusted $1,588, both up 1% in Q3 and 6% YTD including dividends.","BAM gross written premiums & MSC $36M in Q3 vs $46M a year ago; Ark combined ratio 81% (87% year ago).","WM Outrigger Re combined ratio 44%, pre-tax income $37M; Kudu annualized adjusted EBITDA grew to $47M.","MediaAlpha share price decline reduced ABVPS by 1%; carrying value $189M vs $236M at June 30.","Announced acquisition of Bamboo and launch of WM Partners; undeployed capital roughly $400M."],"urls":{"canonical":"https://secwatch.observer/filing/0000776867-23-000016","json":"https://secwatch.observer/filing/0000776867-23-000016.json","markdown":"https://secwatch.observer/filing/0000776867-23-000016.md","text":"https://secwatch.observer/filing/0000776867-23-000016.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/776867/000077686723000016/0000776867-23-000016-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/776867/000077686723000016/wtm-20231106.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-08T21:39:34.658843+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":"49418e8013a0ca8239687f58023568270148b39c","claim":"WHITE MOUNTAINS INSURANCE GROUP LTD reported financial results for three months ended September 30, 2023.","evidence_excerpt":"On November 6, 2023, White Mountains Insurance Group, Ltd. issued a press release announcing its results for the three and nine months ended September 30, 2023.","evidence_source":"SEC 8-K Item 2.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/776867/000077686723000016/0000776867-23-000016-index.htm","confidence":0.9,"family_label":"Earnings Releases","details":[{"label":"Period","value":"three months ended September 30, 2023"},{"label":"Result","value":"reported results"}],"fact_type":"earnings_release"},{"claim_id":"b0a5ffb75d7ef83044c5e52ff6ceac81d71c6e1d","claim":"WHITE MOUNTAINS INSURANCE GROUP LTD reported financial results for nine months ended September 30, 2023.","evidence_excerpt":"On November 6, 2023, White Mountains Insurance Group, Ltd. issued a press release announcing its results for the three and nine months ended September 30, 2023.","evidence_source":"SEC 8-K Item 2.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/776867/000077686723000016/0000776867-23-000016-index.htm","confidence":0.9,"family_label":"Earnings Releases","details":[{"label":"Period","value":"nine months ended September 30, 2023"},{"label":"Result","value":"reported results"}],"fact_type":"earnings_release"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}