# White Mountains Insurance Group Ltd: Form DEF 14A, filed Apr 1, 2026

- Company: [White Mountains Insurance Group Ltd](/companies/wtm.md) (CIK 776867)
- Form: DEF 14A
- Filed: 2026-04-01
- Accepted by EDGAR: Apr 1, 2026, 16:00 ET
- Period: 2026-05-21
- Accession: 0001104659-26-038487
- Inline XBRL: yes
- Main document: https://www.sec.gov/Archives/edgar/data/776867/000110465926038487/tm261405d1_def14a.htm
- All documents and exhibits: https://www.sec.gov/Archives/edgar/data/776867/000110465926038487/

## 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/776867/000110465926038487/tm261405d1_def14a.htm

Filed Apr 1, 2026.
Source: SEC EDGAR, the filing index for accession 0001104659-26-038487. Last ingested by Listed: Nov 6, 2026, 02:06 ET. No prices; not investment advice.