{"filing":{"accession_number":"0001628280-26-053913","cik":"0000776867","ticker":"WTM","company_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","form":"8-K","filing_date":"2026-08-06","report_date":"2026-08-06","primary_document":"wtm-20260806.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/776867/000162828026053913/wtm-20260806.htm"},"events":[{"id":25874,"run_id":23491,"accession_number":"0001628280-26-053913","anchor_item_number":"2.02","event_type":"earnings_release","event_domain":"financial","is_material":true,"confidence":0.98,"summary":"White Mountains issued a press release on August 6, 2026 announcing its results for the three and six months ended June 30, 2026, disclosing comprehensive income, book value per share, segment performance (Ark, Kudu, HG Global, Distinguished, MediaAlpha, WTM Partners), and investment returns. This is a standard quarterly earnings release filed under Item 2.02, with the press release attached as Exhibit 99.1.","company_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","ticker":"WTM","filing_date":"2026-08-06","form":"8-K","submitted_at":null,"items":[{"id":26808,"accession_number":"0001628280-26-053913","item_number":"2.02","item_title":"RESULTS OF OPERATIONS AND FINANCIAL CONDITION.","event_type":"earnings_release","event_domain":"financial","is_material":true,"confidence":0.98,"reasoning":"White Mountains issued a press release on August 6, 2026 announcing its results for the three and six months ended June 30, 2026, disclosing comprehensive income, book value per share, segment performance (Ark, Kudu, HG Global, Distinguished, MediaAlpha, WTM Partners), and investment returns. This is a standard quarterly earnings release filed under Item 2.02, with the press release attached as Exhibit 99.1.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-08-09T02:40:17.611337+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":26808,"accession_number":"0001628280-26-053913","item_number":"2.02","item_title":"RESULTS OF OPERATIONS AND FINANCIAL CONDITION.","event_type":"earnings_release","event_domain":"financial","is_material":true,"confidence":0.98,"reasoning":"White Mountains issued a press release on August 6, 2026 announcing its results for the three and six months ended June 30, 2026, disclosing comprehensive income, book value per share, segment performance (Ark, Kudu, HG Global, Distinguished, MediaAlpha, WTM Partners), and investment returns. This is a standard quarterly earnings release filed under Item 2.02, with the press release attached as Exhibit 99.1.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-08-09T02:40:17.611337+00:00","company_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","ticker":"WTM","filing_date":"2026-08-06"}]}