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 |
|---|---|---|---|
| N-PX | Filing | Aug 26, 2026 | Jun 30, 2026 |
| 11-K | Employee savings plan report | Jun 30, 2026 | Dec 31, 2025 |
| SC TO-I/A | Filing | Dec 29, 2025 | — |
| SC TO-I/A | Filing | Dec 22, 2025 | — |
| SC TO-I | Filing | Nov 21, 2025 | — |
| N-PX | Filing | Aug 27, 2025 | Jun 30, 2025 |
| 11-K | Employee savings plan report | Jul 7, 2025 | Dec 31, 2024 |
| N-PX | Filing | Aug 29, 2024 | Jun 30, 2024 |
| 11-K | Employee savings plan report | May 31, 2024 | Dec 31, 2023 |
| SC TO-T/A | Filing | Jun 30, 2023 | — |
| SC TO-T/A | Filing | Jun 27, 2023 | — |
| 11-K | Employee savings plan report | Jun 15, 2023 | Dec 31, 2022 |
| SC TO-T | Filing | May 26, 2023 | — |
| DEFR14A | Filing | Apr 6, 2023 | — |
| SC TO-I/A | Filing | Sep 26, 2022 | — |
| SC TO-I/A | Filing | Sep 21, 2022 | — |
| SC TO-I/A | Filing | Aug 30, 2022 | — |
| SC TO-I | Filing | Aug 22, 2022 | — |
| 11-K | Employee savings plan report | Jun 14, 2022 | Dec 31, 2021 |
| 11-K | Employee savings plan report | Jun 15, 2021 | Dec 31, 2020 |
| 13F-NT | Filing | Nov 12, 2020 | Sep 30, 2020 |
| 13F-NT | Filing | Aug 12, 2020 | Jun 30, 2020 |
| UPLOAD | Letter from the SEC | Jun 17, 2020 | — |
| 11-K | Employee savings plan report | Jun 16, 2020 | Dec 31, 2019 |
| CORRESP | Letter to the SEC | Jun 10, 2020 | — |
| UPLOAD | Letter from the SEC | May 28, 2020 | — |
| 13F-NT | Filing | May 12, 2020 | Mar 31, 2020 |
| 13F-NT | Filing | Feb 12, 2020 | Dec 31, 2019 |
| 13F-NT | Filing | Nov 12, 2019 | Sep 30, 2019 |
| 13F-NT | Filing | Aug 8, 2019 | Jun 30, 2019 |
| 13F-NT | Filing | May 13, 2019 | Mar 31, 2019 |
| 11-K | Employee savings plan report | May 6, 2019 | Dec 31, 2018 |
| 13F-NT | Filing | Feb 13, 2019 | Dec 31, 2018 |
| 13F-NT | Filing | Nov 7, 2018 | Sep 30, 2018 |
| 13F-NT | Filing | Aug 8, 2018 | Jun 30, 2018 |
| 11-K | Employee savings plan report | Jun 29, 2018 | Dec 31, 2017 |
| SC TO-I/A | Filing | May 11, 2018 | — |
| 13F-NT | Filing | May 10, 2018 | Mar 31, 2018 |
| SC TO-I/A | Filing | May 8, 2018 | — |
| SC TO-I/A | Filing | May 2, 2018 | — |
| SC TO-I | Filing | Apr 10, 2018 | — |
| SC TO-C | 8-k | Apr 10, 2018 | — |
| 13F-NT | Filing | Feb 13, 2018 | Dec 31, 2017 |
| 13F-NT | Filing | Nov 9, 2017 | Sep 30, 2017 |
| SC TO-I/A | Filing | Sep 19, 2017 | — |
| SC TO-I/A | Filing | Sep 15, 2017 | — |
| SC TO-I/A | Filing | Aug 25, 2017 | — |
| SC TO-I | Filing | Aug 17, 2017 | — |
| SC TO-C | 8-k | Aug 17, 2017 | — |
| 13F-NT | Filing | Aug 10, 2017 | Jun 30, 2017 |
| 13F-NT | Filing | May 11, 2017 | Mar 31, 2017 |
| 13F-NT | Filing | Feb 13, 2017 | Dec 31, 2016 |
| 13F-NT | Filing | Nov 10, 2016 | Sep 30, 2016 |
| 13F-NT | Filing | Aug 11, 2016 | Jun 30, 2016 |
| 11-K | Employee savings plan report | Jun 17, 2016 | Dec 31, 2015 |
| 13F-NT | Filing | May 12, 2016 | Mar 31, 2016 |
| 11-K | Employee savings plan report | Jun 17, 2015 | Dec 31, 2014 |
| 11-K | Employee savings plan report | Jun 20, 2014 | Dec 31, 2013 |
| 11-K | Employee savings plan report | Jun 21, 2013 | Dec 31, 2012 |
| DEFR14A | Filing | Apr 10, 2013 | — |
| UPLOAD | Letter from the SEC | Feb 22, 2013 | — |
| CORRESP | Letter to the SEC | Feb 19, 2013 | — |
| CORRESP | Letter to the SEC | Jan 18, 2013 | — |
| CORRESP | Letter to the SEC | Dec 17, 2012 | — |
| UPLOAD | Letter from the SEC | Nov 30, 2012 | — |
| 11-K | Employee savings plan report | Jun 22, 2012 | Dec 31, 2011 |
| SC TO-I/A | Amendment no. 4 | Mar 28, 2012 | — |
| SC TO-I/A | Amendment no. 3 | Mar 23, 2012 | — |
| SC TO-I/A | Amendment no. 2 | Mar 8, 2012 | — |
| SC TO-I/A | Amendment no. 1 | Feb 29, 2012 | — |
| SC TO-I | Filing | Feb 24, 2012 | — |
| SC TO-C | Schedule to | Feb 23, 2012 | — |
| UPLOAD | Letter from the SEC | Jan 11, 2012 | — |
| CORRESP | Letter to the SEC | Jan 3, 2012 | — |
| UPLOAD | Letter from the SEC | Dec 13, 2011 | — |
| SC TO-I/A | Amendment no. 3 | Nov 18, 2011 | — |
| SC TO-I/A | Amendment no. 2 | Nov 15, 2011 | — |
| SC TO-I/A | Filing | Oct 19, 2011 | — |
| SC TO-I | Filing | Oct 17, 2011 | — |
| SC TO-C | Schedule to | Oct 14, 2011 | — |
| SC TO-I/A | Amendment no. 4 | Sep 21, 2011 | — |
| SC TO-I/A | Amendment no. 3 | Sep 16, 2011 | — |
| CORRESP | Letter to the SEC | Sep 2, 2011 | — |
| SC TO-I/A | Filing | Aug 26, 2011 | — |
| UPLOAD | Letter from the SEC | Aug 24, 2011 | — |
| SC TO-I/A | Filing | Aug 23, 2011 | — |
| SC TO-I | Filing | Aug 18, 2011 | — |
| SC TO-C | Schedule to | Aug 17, 2011 | — |
| 11-K | Employee savings plan report | Jun 29, 2011 | Dec 31, 2010 |
| 11-K | Employee savings plan report | Jun 23, 2011 | Dec 31, 2010 |
| UPLOAD | Letter from the SEC | Nov 4, 2010 | — |
| CORRESP | Letter to the SEC | Oct 22, 2010 | — |
| CORRESP | Letter to the SEC | Oct 5, 2010 | — |
| UPLOAD | Letter from the SEC | Sep 27, 2010 | — |
| 11-K | Employee savings plan report | Jun 17, 2010 | Dec 31, 2009 |
| 11-K | Employee savings plan report | Jun 17, 2010 | Dec 31, 2009 |
Showing 96 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.
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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.