Company facts
- Industry
- Fire, Marine & Casualty Insurance
- Headquarters
- Hanover, New Hampshire
- Most recent report
- 10-Q, filed Nov 5, 2026
- Incorporated
- N/A
- Filings on record
- 1,000+ filings
- On EDGAR
- CIK 776867
- Fiscal year ends
- December
- Filer status
- Large accelerated filer
Financials 8 of 69
News 8 of 199
Prospectuses and Registrations 8 of 13
- S-8 POS Post-effective amendment to an employee plan registration Dec 30, 2020
- S-8 POS Post-effective amendment to an employee plan registration Dec 30, 2020
- S-8 POS Post-effective amendment to an employee plan registration Dec 30, 2020
- S-8 POS Post-effective amendment to an employee plan registration Dec 30, 2020
- S-8 POS Post-effective amendment to an employee plan registration Dec 30, 2020
- S-8 POS Post-effective amendment to an employee plan registration Dec 30, 2020
- S-8 POS Post-effective amendment to an employee plan registration Dec 30, 2020
- S-8 POS Post-effective amendment to an employee plan registration Dec 29, 2020
Proxies 8 of 21
- DEF 14A Proxy statement for a shareholder vote Apr 1, 2026
- DEF 14A Proxy statement for a shareholder vote Apr 2, 2025
- DEF 14A Proxy statement for a shareholder vote Apr 4, 2024
- DEFA14A Extra proxy material May 10, 2023
- DEFR14A Apr 6, 2023
- DEF 14A Proxy statement for a shareholder vote Apr 5, 2023
- DEFA14A Extra proxy material May 16, 2022
- DEF 14A Proxy statement for a shareholder vote Apr 6, 2022
Ownership 8 of 613
- SCHEDULE 13D/A Large holder reported an active stake, amended Nov 5, 2026
- 4 Insider reported a trade Nov 5, 2026
- SCHEDULE 13D/A Large holder reported an active stake, amended Oct 30, 2026
- 4 Insider reported a trade Aug 31, 2026
- 4 Insider reported a trade Aug 27, 2026
- 3 Insider reported their initial holding Aug 27, 2026
- 13F-HR Quarterly report of institutional holdings Aug 12, 2026
- 4 Insider reported a trade May 22, 2026
Other 8 of 85
- N-PX Record of how a fund voted its shares Aug 26, 2026
- 11-K Employee stock plan report Jun 30, 2026
- ARS Annual report sent to shareholders Apr 1, 2026
- SC TO-I/A Amended filing Dec 29, 2025
- SC TO-I/A Amended filing Dec 22, 2025
- SC TO-I Nov 21, 2025
- N-PX Record of how a fund voted its shares Aug 27, 2025
- 11-K Employee stock plan report Jul 7, 2025
Everything here comes from White Mountains Insurance Group Ltd's own filings on SEC EDGAR. The filing list is rechecked every hour.