# White Mountains Insurance Group Ltd: Form 8-K, filed Dec 8, 2025

- Company: [White Mountains Insurance Group Ltd](/companies/wtm.md) (CIK 776867)
- Form: 8-K
- Filed: 2025-12-08
- Accepted by EDGAR: Dec 8, 2025, 08:10 ET
- Period: 2025-12-05
- Accession: 0001628280-25-055702
- Inline XBRL: yes
- Main document: https://www.sec.gov/Archives/edgar/data/776867/000162828025055702/wtm-20251205.htm
- All documents and exhibits: https://www.sec.gov/Archives/edgar/data/776867/000162828025055702/

## Items reported

- Item 2.01: Completion of an acquisition or disposition
- Item 8.01: Other events
- Item 9.01: Financial statements and exhibits

## Sections

Sections are extracted only from 10-K and 10-Q reports. Read this filing’s documents on sec.gov. https://www.sec.gov/Archives/edgar/data/776867/000162828025055702/wtm-20251205.htm

Filed Dec 8, 2025.
Source: SEC EDGAR, the filing index for accession 0001628280-25-055702. Last ingested by Listed: Oct 30, 2026, 21:03 ET. No prices; not investment advice.