# White Mountains Insurance Group Ltd: Form SCHEDULE 13D/A, filed May 1, 2026

- Company: [White Mountains Insurance Group Ltd](/companies/wtm.md) (CIK 776867)
- Form: SCHEDULE 13D/A
- Filed: 2026-05-01
- Accepted by EDGAR: May 1, 2026, 17:30 ET
- Period: not reported
- Accession: 0000950157-26-000566
- Inline XBRL: no
- Main document: https://www.sec.gov/Archives/edgar/data/776867/000095015726000566/xslSCHEDULE_13D_X02/primary_doc.xml
- All documents and exhibits: https://www.sec.gov/Archives/edgar/data/776867/000095015726000566/

## 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/776867/000095015726000566/xslSCHEDULE_13D_X02/primary_doc.xml

Filed May 1, 2026.
Source: SEC EDGAR, the filing index for accession 0000950157-26-000566. Last ingested by Listed: Nov 6, 2026, 02:06 ET. No prices; not investment advice.