White Mountains Insurance Group Ltd SEC filings WTM
White Mountains Insurance Group Ltd has 1,005 filings in SEC EDGAR's recent list, going back to Mar 29, 2010. Its latest annual report, Form ARS, was filed on Apr 1, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 5, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 5, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| DEF 14A | Proxy statement | Apr 1, 2026 | May 21, 2026 |
| DEF 14A | Proxy statement | Apr 2, 2025 | May 22, 2025 |
| DEF 14A | Proxy statement | Apr 4, 2024 | May 23, 2024 |
| DEFA14A | Additional proxy material | May 10, 2023 | — |
| DEF 14A | Proxy statement | Apr 5, 2023 | — |
| DEFA14A | Additional proxy material | May 16, 2022 | — |
| DEF 14A | Proxy statement | Apr 6, 2022 | May 26, 2022 |
| DEF 14A | Proxy statement | Apr 7, 2021 | May 27, 2021 |
| DEF 14A | Proxy statement | Apr 7, 2020 | May 21, 2020 |
| DEF 14A | Proxy statement | Apr 8, 2019 | May 23, 2019 |
| DEF 14A | Proxy statement | Apr 10, 2018 | May 24, 2018 |
| DEF 14A | Proxy statement | Apr 19, 2017 | May 25, 2017 |
| DEF 14A | Proxy statement | Apr 21, 2016 | May 26, 2016 |
| DEF 14A | Proxy statement | Apr 10, 2015 | May 28, 2015 |
| DEF 14A | Proxy statement | Apr 3, 2014 | May 22, 2014 |
| DEF 14A | Proxy statement | Apr 4, 2013 | May 23, 2013 |
| DEF 14A | Proxy statement | Apr 3, 2012 | May 24, 2012 |
| DEF 14A | Proxy statement | Apr 7, 2011 | May 26, 2011 |
| DEFA14A | Additional proxy material | May 5, 2010 | — |
| DEF 14A | Proxy statement | Mar 29, 2010 | May 26, 2010 |
Showing 20 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
Company profile
- Industry
- Fire, Marine & Casualty Insurance (SIC 6331)
- Listed as
- WTM (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- Bermuda
- Headquarters
- Hanover, NH
- SEC filer status
- Large accelerated filer
- SEC CIK
- 776867
- Former names
- WHITE MOUNTAINS INSURANCE GROUP INC (until Oct 20, 1999); FUND AMERICAN ENTERPRISES HOLDINGS INC (until Feb 10, 1999)
Other Fire, Marine & Casualty Insurance companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.