{"filing":{"accession_number":"0001628280-26-037284","cik":"0000776867","ticker":"WTM","company_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","form":"8-K","filing_date":"2026-05-21","report_date":null,"primary_document":"wtm-20260521.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/776867/000162828026037284/wtm-20260521.htm"},"events":[{"id":966,"run_id":837,"accession_number":"0001628280-26-037284","anchor_item_number":"5.02","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.95,"summary":"Steven M. Yi did not stand for re-election as a director and completed his tenure on May 21, 2026, resulting in his departure from the Board of Directors.","company_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","ticker":"WTM","filing_date":"2026-05-21","items":[{"id":1237,"accession_number":"0001628280-26-037284","item_number":"5.02","item_title":"Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.95,"reasoning":"Steven M. Yi did not stand for re-election as a director and completed his tenure on May 21, 2026. This is a clear departure of a director from the Board of Directors. Director changes are material to investors as they affect corporate governance and board composition.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-22T03:05:13.716911+00:00","company_name":"","ticker":null,"filing_date":""}]},{"id":967,"run_id":837,"accession_number":"0001628280-26-037284","anchor_item_number":"5.07","event_type":"shareholder_vote_results","event_domain":"governance","is_material":true,"confidence":0.98,"summary":"White Mountains Insurance Group held its 2026 Annual General Meeting on May 21, 2026, with shareholders voting on three proposals: election of four Class II directors, advisory approval of executive compensation, and appointment of PricewaterhouseCoopers LLP as independent auditor.","company_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","ticker":"WTM","filing_date":"2026-05-21","items":[{"id":1238,"accession_number":"0001628280-26-037284","item_number":"5.07","item_title":"Submission of Matters to a Vote of Security Holders.","event_type":"shareholder_vote_results","event_domain":"governance","is_material":true,"confidence":0.98,"reasoning":"This is a clear disclosure of shareholder voting results from the 2026 Annual General Meeting held on May 21, 2026. The filing presents detailed vote tallies for three proposals: election of Class II directors (four nominees), advisory approval of executive compensation, and appointment of PricewaterhouseCoopers LLP as independent auditor. Item 5.07 is the designated 8-K item for shareholder vote results, and the prose directly reports the voting outcomes with vote counts and percentages.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-22T03:05:13.716911+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":1237,"accession_number":"0001628280-26-037284","item_number":"5.02","item_title":"Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.95,"reasoning":"Steven M. Yi did not stand for re-election as a director and completed his tenure on May 21, 2026. This is a clear departure of a director from the Board of Directors. Director changes are material to investors as they affect corporate governance and board composition.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-22T03:05:13.716911+00:00","company_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","ticker":"WTM","filing_date":"2026-05-21"},{"id":1238,"accession_number":"0001628280-26-037284","item_number":"5.07","item_title":"Submission of Matters to a Vote of Security Holders.","event_type":"shareholder_vote_results","event_domain":"governance","is_material":true,"confidence":0.98,"reasoning":"This is a clear disclosure of shareholder voting results from the 2026 Annual General Meeting held on May 21, 2026. The filing presents detailed vote tallies for three proposals: election of Class II directors (four nominees), advisory approval of executive compensation, and appointment of PricewaterhouseCoopers LLP as independent auditor. Item 5.07 is the designated 8-K item for shareholder vote results, and the prose directly reports the voting outcomes with vote counts and percentages.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-22T03:05:13.716911+00:00","company_name":"WHITE MOUNTAINS INSURANCE GROUP LTD","ticker":"WTM","filing_date":"2026-05-21"}]}