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 |
|---|---|---|---|
| 8-K |
Current report
Results of operations
|
Nov 5, 2026 | Nov 5, 2026 |
| 8-K |
Current report
Officer or director change
|
Aug 27, 2026 | Aug 26, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2026 | Aug 6, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 5, 2026 | Jun 5, 2026 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 21, 2026 | May 21, 2026 |
| 8-K |
Current report
Material agreement, New debt
|
May 15, 2026 | May 14, 2026 |
| 8-K |
Current report
Results of operations
|
May 6, 2026 | May 6, 2026 |
| 8-K |
Current report
Other events
|
Apr 1, 2026 | Apr 1, 2026 |
| 8-K |
Current report
Other events
|
Feb 26, 2026 | Feb 26, 2026 |
| 8-K |
Current report
Results of operations
|
Feb 6, 2026 | Feb 6, 2026 |
| 8-K |
Current report
Other events
|
Jan 7, 2026 | Jan 7, 2026 |
| 8-K |
Current report
Acquisition or sale of assets, Other events
|
Dec 8, 2025 | Dec 5, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2025 | Nov 6, 2025 |
| 8-K |
Current report
Material agreement
|
Oct 3, 2025 | Oct 2, 2025 |
| 8-K |
Current report
Other events
|
Sep 3, 2025 | Sep 2, 2025 |
| 8-K |
Current report
Officer or director change
|
Sep 2, 2025 | Sep 2, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2025 | Aug 7, 2025 |
| 8-K |
Current report
Other events
|
Jul 18, 2025 | Jul 18, 2025 |
| 8-K |
Current report
Other events
|
Jul 16, 2025 | Jul 16, 2025 |
| 8-K |
Current report
Material agreement
|
Jul 7, 2025 | Jul 4, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 6, 2025 | Jun 6, 2025 |
| 8-K |
Current report
Shareholder vote results
|
May 22, 2025 | May 22, 2025 |
| 8-K |
Current report
Results of operations
|
May 7, 2025 | May 7, 2025 |
| 8-K |
Current report
Other events
|
Apr 10, 2025 | Apr 10, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 7, 2025 | Feb 7, 2025 |
| 8-K |
Current report
Other events
|
Jan 8, 2025 | Jan 8, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2024 | Nov 6, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2024 | Aug 7, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 7, 2024 | Jun 7, 2024 |
| 8-K |
Current report
Shareholder vote results
|
May 23, 2024 | May 23, 2024 |
| 8-K |
Current report
Results of operations
|
May 9, 2024 | May 9, 2024 |
| 8-K |
Current report
Officer or director change
|
Apr 10, 2024 | Apr 10, 2024 |
| 8-K |
Current report
Officer or director change
|
Feb 23, 2024 | Feb 22, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 7, 2024 | Feb 7, 2024 |
| 8-K |
Current report
Other events
|
Jan 3, 2024 | Jan 2, 2024 |
| 8-K |
Current report
Other events
|
Dec 21, 2023 | Dec 21, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2023 | Nov 6, 2023 |
| 8-K |
Current report
Material agreement
|
Oct 20, 2023 | Oct 19, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2023 | Aug 7, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 6, 2023 | Jun 6, 2023 |
| 8-K |
Current report
Shareholder vote results
|
May 25, 2023 | May 25, 2023 |
| 8-K |
Current report
Officer or director change
|
May 25, 2023 | May 25, 2023 |
| 8-K |
Current report
Results of operations
|
May 9, 2023 | May 9, 2023 |
| 8-K |
Current report
Officer or director change
|
Feb 23, 2023 | Feb 22, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 7, 2023 | Feb 7, 2023 |
| 8-K |
Current report
Other events
|
Dec 21, 2022 | Dec 21, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2022 | Nov 7, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2022 | Aug 8, 2022 |
| 8-K |
Current report
Acquisition or sale of assets, Other events
|
Aug 5, 2022 | Aug 1, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 10, 2022 | Jun 10, 2022 |
| 8-K |
Current report
Shareholder vote results
|
May 26, 2022 | May 26, 2022 |
| 8-K |
Current report
Other events
|
May 26, 2022 | May 26, 2022 |
| 8-K |
Current report
Material agreement
|
May 10, 2022 | May 9, 2022 |
| 8-K |
Current report
Results of operations
|
May 6, 2022 | May 6, 2022 |
| 8-K |
Current report
Other events
|
Apr 1, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 8, 2022 | Feb 8, 2022 |
| 8-K |
Current report
Officer or director change
|
Dec 2, 2021 | Nov 29, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2021 | Nov 8, 2021 |
| 8-K |
Current report
Officer or director change
|
Oct 12, 2021 | Oct 10, 2021 |
| 8-K |
Current report
Other events
|
Sep 13, 2021 | Sep 8, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 13, 2021 | Aug 11, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2021 | Aug 6, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 19, 2021 | Jul 13, 2021 |
| 8-K |
Current report
Other events
|
Jun 29, 2021 | Jun 29, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 4, 2021 | Jun 4, 2021 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 28, 2021 | May 27, 2021 |
| 8-K |
Current report
Results of operations
|
May 10, 2021 | May 10, 2021 |
| 8-K/A |
Amended current report
Acquisition or sale of assets
|
Mar 16, 2021 | Jan 1, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 5, 2021 | Feb 5, 2021 |
| 8-K |
Current report
Acquisition or sale of assets
|
Jan 4, 2021 | Jan 1, 2021 |
| 8-K/A |
Amended current report
Officer or director change
|
Dec 21, 2020 | Dec 9, 2020 |
| 8-K |
Current report
Other events
|
Dec 21, 2020 | Dec 16, 2020 |
| 8-K |
Current report
Material agreement
|
Dec 15, 2020 | Dec 14, 2020 |
| 8-K |
Current report
Officer or director change
|
Dec 10, 2020 | Dec 9, 2020 |
| 8-K |
Current report
Officer or director change
|
Dec 1, 2020 | Nov 30, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2020 | Nov 6, 2020 |
| 8-K |
Current report
Material agreement
|
Oct 1, 2020 | Oct 1, 2020 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2020 | Aug 7, 2020 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 22, 2020 | May 21, 2020 |
| 8-K |
Current report
Results of operations
|
May 8, 2020 | May 8, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 9, 2020 | Apr 7, 2020 |
| 8-K |
Current report
Other events
|
Mar 23, 2020 | Mar 20, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 5, 2020 | Feb 5, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2019 | Nov 6, 2019 |
| 8-K |
Current report
Officer or director change
|
Aug 30, 2019 | Aug 29, 2019 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2019 | Aug 6, 2019 |
| 8-K |
Current report
Other events
|
Jun 28, 2019 | Jun 28, 2019 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 7, 2019 | Jun 7, 2019 |
| 8-K |
Current report
Shareholder vote results
|
May 24, 2019 | May 24, 2019 |
| 8-K |
Current report
Results of operations
|
May 6, 2019 | May 6, 2019 |
| 8-K |
Current report
Other events
|
Apr 4, 2019 | Apr 4, 2019 |
| 8-K |
Current report
Officer or director change
|
Mar 1, 2019 | Feb 27, 2019 |
| 8-K |
Current report
Other events
|
Feb 26, 2019 | Feb 26, 2019 |
| 8-K |
Current report
Other events
|
Feb 14, 2019 | Feb 14, 2019 |
| 8-K |
Current report
Results of operations
|
Feb 6, 2019 | Feb 6, 2019 |
| 8-K |
Current report
Other events
|
Feb 4, 2019 | Feb 4, 2019 |
| 8-K |
Current report
Officer or director change, Other events
|
Jan 7, 2019 | Jan 3, 2019 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2018 | Nov 5, 2018 |
| 8-K |
Current report
Officer or director change
|
Aug 24, 2018 | Aug 23, 2018 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2018 | Aug 7, 2018 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 8, 2018 | Jun 8, 2018 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 29, 2018 | May 24, 2018 |
| 8-K |
Current report
Other events
|
May 11, 2018 | May 11, 2018 |
| 8-K |
Current report
Results of operations
|
May 2, 2018 | May 2, 2018 |
| 8-K |
Current report
Other events
|
Apr 10, 2018 | Apr 10, 2018 |
| 8-K |
Current report
Material agreement
|
Apr 2, 2018 | Mar 31, 2018 |
| 8-K |
Current report
Officer or director change
|
Mar 2, 2018 | Mar 1, 2018 |
| 8-K |
Current report
Results of operations
|
Feb 7, 2018 | Feb 7, 2018 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2017 | Nov 8, 2017 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Officer or director change, Other events
|
Sep 28, 2017 | Sep 28, 2017 |
| 8-K | Current report | Sep 15, 2017 | Sep 15, 2017 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Aug 28, 2017 | Aug 24, 2017 |
| 8-K |
Current report
Officer or director change
|
Aug 25, 2017 | Aug 24, 2017 |
| 8-K |
Current report
Other events
|
Aug 17, 2017 | Aug 17, 2017 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2017 | Aug 4, 2017 |
| 8-K |
Current report
Other events
|
Jun 30, 2017 | Jun 26, 2017 |
| 8-K |
Current report
Shareholder vote results
|
May 31, 2017 | May 25, 2017 |
| 8-K |
Current report
Regulation FD disclosure
|
May 8, 2017 | May 8, 2017 |
| 8-K |
Current report
Material agreement
|
May 2, 2017 | May 2, 2017 |
| 8-K |
Current report
Officer or director change
|
May 2, 2017 | May 2, 2017 |
| 8-K |
Current report
Results of operations
|
May 2, 2017 | May 2, 2017 |
| 8-K |
Current report
Officer or director change
|
Mar 6, 2017 | Mar 6, 2017 |
| 8-K |
Current report
Results of operations
|
Feb 7, 2017 | Feb 7, 2017 |
| 8-K |
Current report
Results of operations
|
Nov 2, 2016 | Nov 2, 2016 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2016 | Aug 3, 2016 |
| 8-K |
Current report
Other events
|
Jul 21, 2016 | Jul 21, 2016 |
| 8-K |
Current report
Other events
|
Jun 9, 2016 | Jun 9, 2016 |
| 8-K |
Current report
Shareholder vote results
|
May 31, 2016 | May 26, 2016 |
| 8-K |
Current report
Results of operations
|
May 2, 2016 | May 2, 2016 |
| 8-K |
Current report
Officer or director change
|
Apr 22, 2016 | Apr 19, 2016 |
| 8-K |
Current report
Acquisition or sale of assets
|
Apr 18, 2016 | Apr 18, 2016 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 7, 2016 | Apr 7, 2016 |
| 8-K |
Current report
Other events
|
Mar 30, 2016 | Mar 30, 2016 |
| 8-K |
Current report
Results of operations
|
Feb 5, 2016 | Feb 5, 2016 |
| 8-K |
Current report
Acquisition or sale of assets
|
Feb 4, 2016 | Feb 1, 2016 |
| 8-K |
Current report
Results of operations
|
Nov 2, 2015 | Nov 2, 2015 |
| 8-K |
Current report
Officer or director change
|
Jul 30, 2015 | Jul 24, 2015 |
| 8-K |
Current report
Results of operations
|
Jul 27, 2015 | Jul 27, 2015 |
| 8-K |
Current report
Material agreement
|
Jul 27, 2015 | Jul 24, 2015 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 12, 2015 | Jun 12, 2015 |
| 8-K |
Current report
Officer or director change
|
Jun 8, 2015 | Jun 8, 2015 |
| 8-K |
Current report
Shareholder vote results
|
Jun 1, 2015 | May 28, 2015 |
| 8-K |
Current report
Results of operations
|
May 4, 2015 | May 4, 2015 |
| 8-K |
Current report
Officer or director change
|
Apr 10, 2015 | Apr 10, 2015 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 26, 2015 | Mar 26, 2015 |
| 8-K |
Current report
Officer or director change
|
Mar 2, 2015 | Feb 25, 2015 |
| 8-K |
Current report
Results of operations
|
Feb 10, 2015 | Feb 10, 2015 |
| 8-K |
Current report
Acquisition or sale of assets
|
Dec 23, 2014 | Dec 23, 2014 |
| 8-K |
Current report
Results of operations
|
Oct 29, 2014 | Oct 29, 2014 |
| 8-K |
Current report
Other events
|
Oct 14, 2014 | Oct 13, 2014 |
| 8-K |
Current report
Results of operations
|
Jul 29, 2014 | Jul 29, 2014 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 10, 2014 | Jun 10, 2014 |
| 8-K |
Current report
Shareholder vote results
|
May 27, 2014 | May 22, 2014 |
| 8-K |
Current report
Results of operations
|
Apr 28, 2014 | Apr 28, 2014 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 12, 2014 | Mar 12, 2014 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 10, 2014 | Mar 10, 2014 |
| 8-K |
Current report
Officer or director change
|
Mar 4, 2014 | Feb 26, 2014 |
| 8-K |
Current report
Results of operations
|
Feb 7, 2014 | Feb 7, 2014 |
| 8-K |
Current report
Officer or director change
|
Dec 20, 2013 | Dec 20, 2013 |
| 8-K |
Current report
Results of operations
|
Oct 28, 2013 | Oct 28, 2013 |
| 8-K |
Current report
Other events
|
Aug 22, 2013 | Aug 22, 2013 |
| 8-K |
Current report
Other events
|
Aug 21, 2013 | Aug 21, 2013 |
| 8-K |
Current report
Results of operations
|
Jul 30, 2013 | Jul 30, 2013 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 7, 2013 | Jun 7, 2013 |
| 8-K |
Current report
Shareholder vote results
|
May 28, 2013 | May 23, 2013 |
| 8-K |
Current report
Results of operations
|
Apr 29, 2013 | Apr 29, 2013 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 4, 2013 | Apr 3, 2013 |
| 8-K |
Current report
Officer or director change
|
Mar 1, 2013 | Feb 27, 2013 |
| 8-K |
Current report
Results of operations
|
Feb 5, 2013 | Feb 5, 2013 |
| 8-K |
Current report
Results of operations
|
Oct 30, 2012 | Oct 30, 2012 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 18, 2012 | Oct 18, 2012 |
| 8-K |
Current report
Results of operations
|
Jul 27, 2012 | Jul 27, 2012 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 13, 2012 | Jun 13, 2012 |
| 8-K |
Current report
Shareholder vote results
|
May 30, 2012 | May 24, 2012 |
| 8-K |
Current report
Results of operations
|
Apr 27, 2012 | Apr 27, 2012 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 5, 2012 | Apr 5, 2012 |
| 8-K |
Current report
Officer or director change
|
Feb 24, 2012 | Feb 22, 2012 |
| 8-K |
Current report
Results of operations
|
Feb 3, 2012 | Feb 3, 2012 |
| 8-K |
Current report
Officer or director change
|
Nov 22, 2011 | Nov 16, 2011 |
| 8-K |
Current report
Other events
|
Nov 18, 2011 | Nov 17, 2011 |
| 8-K |
Current report
Results of operations
|
Oct 28, 2011 | Oct 28, 2011 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Oct 12, 2011 | May 25, 2011 |
| 8-K |
Current report
Other events
|
Oct 7, 2011 | Oct 7, 2011 |
| 8-K |
Current report
Officer or director change
|
Sep 23, 2011 | Sep 22, 2011 |
| 8-K |
Current report
Other events
|
Aug 17, 2011 | Aug 17, 2011 |
| 8-K |
Current report
Results of operations
|
Jul 29, 2011 | Jul 29, 2011 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 22, 2011 | Jun 22, 2011 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 31, 2011 | May 25, 2011 |
| 8-K |
Current report
Material agreement
|
May 18, 2011 | May 17, 2011 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 29, 2011 | Apr 29, 2011 |
| 8-K |
Current report
Results of operations
|
Apr 29, 2011 | Apr 29, 2011 |
| 8-K |
Current report
Officer or director change
|
Mar 1, 2011 | Feb 24, 2011 |
| 8-K |
Current report
Results of operations
|
Feb 4, 2011 | Feb 4, 2011 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 29, 2010 | Oct 27, 2010 |
| 8-K |
Current report
Results of operations
|
Oct 29, 2010 | Oct 29, 2010 |
| 8-K |
Current report
Results of operations
|
Jul 30, 2010 | Jul 30, 2010 |
| 8-K |
Current report
Shareholder vote results
|
May 28, 2010 | May 26, 2010 |
| 8-K |
Current report
Regulation FD disclosure
|
May 18, 2010 | May 18, 2010 |
| 8-K |
Current report
Results of operations
|
Apr 29, 2010 | Apr 29, 2010 |
| 8-K |
Current report
Officer or director change
|
Apr 27, 2010 | Apr 27, 2010 |
Showing 200 filings, the most recent 200. 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.