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White Mountains Insurance Group Ltd SEC Filings
What White Mountains Insurance Group Ltd has told the SEC happened, by the 8-K items and forms it filed under: when it reported results, who joined or left, what it bought or sold, and whether its auditor or its accounts ever changed.
WTM overview →Filings on file
131
since Nov 2, 2016
Warning signs
0
none filed
Last results
Aug 6, 2026
8-K item 2.02
Industry
Fire, Marine & Casualty Insurance
SIC 6331
Newest first
Each label is a form type or an 8-K item as filed; each row links to the filing.
| Filed | What it reports | Document |
|---|---|---|
| Aug 27, 2026 | Executive or director change 8-K | Read ↗ |
| Aug 6, 2026 | Quarterly report 10-Q | Read ↗ |
| Aug 6, 2026 | Results announced 8-K | Read ↗ |
| May 21, 2026 | Executive or director changeShareholder vote 8-K | Read ↗ |
| May 15, 2026 | Material agreementNew debt 8-K | Read ↗ |
| May 6, 2026 | Quarterly report 10-Q | Read ↗ |
| May 6, 2026 | Results announced 8-K | Read ↗ |
| Feb 27, 2026 | Annual report 10-K | Read ↗ |
| Feb 6, 2026 | Results announced 8-K | Read ↗ |
| Dec 8, 2025 | Acquisition or sale completed 8-K | Read ↗ |
| Nov 21, 2025 | Tender offer SC TO-I | Read ↗ |
| Nov 6, 2025 | Quarterly report 10-Q | Read ↗ |
| Nov 6, 2025 | Results announced 8-K | Read ↗ |
| Oct 3, 2025 | Material agreement 8-K | Read ↗ |
| Sep 2, 2025 | Executive or director change 8-K | Read ↗ |
| Aug 7, 2025 | Quarterly report 10-Q | Read ↗ |
| Aug 7, 2025 | Results announced 8-K | Read ↗ |
| Jul 7, 2025 | Material agreement 8-K | Read ↗ |
| May 22, 2025 | Shareholder vote 8-K | Read ↗ |
| May 7, 2025 | Quarterly report 10-Q | Read ↗ |
| May 7, 2025 | Results announced 8-K | Read ↗ |
| Feb 28, 2025 | Annual report 10-K | Read ↗ |
| Feb 7, 2025 | Results announced 8-K | Read ↗ |
| Nov 6, 2024 | Quarterly report 10-Q | Read ↗ |
| Nov 6, 2024 | Results announced 8-K | Read ↗ |
| Aug 7, 2024 | Quarterly report 10-Q | Read ↗ |
| Aug 7, 2024 | Results announced 8-K | Read ↗ |
| May 23, 2024 | Shareholder vote 8-K | Read ↗ |
| May 9, 2024 | Quarterly report 10-Q | Read ↗ |
| May 9, 2024 | Results announced 8-K | Read ↗ |
| Apr 10, 2024 | Executive or director change 8-K | Read ↗ |
| Feb 26, 2024 | Annual report 10-K | Read ↗ |
| Feb 23, 2024 | Executive or director change 8-K | Read ↗ |
| Feb 7, 2024 | Results announced 8-K | Read ↗ |
| Nov 6, 2023 | Quarterly report 10-Q | Read ↗ |
| Nov 6, 2023 | Results announced 8-K | Read ↗ |
| Oct 20, 2023 | Material agreement 8-K | Read ↗ |
| Aug 7, 2023 | Quarterly report 10-Q | Read ↗ |
| Aug 7, 2023 | Results announced 8-K | Read ↗ |
| May 26, 2023 | Tender offer SC TO-T | Read ↗ |
| May 25, 2023 | Shareholder vote 8-K | Read ↗ |
| May 25, 2023 | Executive or director change 8-K | Read ↗ |
| May 9, 2023 | Quarterly report 10-Q | Read ↗ |
| May 9, 2023 | Results announced 8-K | Read ↗ |
| Feb 27, 2023 | Annual report 10-K | Read ↗ |
| Feb 23, 2023 | Executive or director change 8-K | Read ↗ |
| Feb 7, 2023 | Results announced 8-K | Read ↗ |
| Nov 7, 2022 | Quarterly report 10-Q | Read ↗ |
| Nov 7, 2022 | Results announced 8-K | Read ↗ |
| Aug 22, 2022 | Tender offer SC TO-I | Read ↗ |
| Aug 8, 2022 | Results announced 8-K | Read ↗ |
| Aug 8, 2022 | Quarterly report 10-Q | Read ↗ |
| Aug 5, 2022 | Acquisition or sale completed 8-K | Read ↗ |
| May 26, 2022 | Shareholder vote 8-K | Read ↗ |
| May 10, 2022 | Material agreement 8-K | Read ↗ |
| May 6, 2022 | Quarterly report 10-Q | Read ↗ |
| May 6, 2022 | Results announced 8-K | Read ↗ |
| Feb 28, 2022 | Annual report 10-K | Read ↗ |
| Feb 8, 2022 | Results announced 8-K | Read ↗ |
| Dec 2, 2021 | Executive or director change 8-K | Read ↗ |
| Nov 8, 2021 | Quarterly report 10-Q | Read ↗ |
| Nov 8, 2021 | Results announced 8-K | Read ↗ |
| Oct 12, 2021 | Executive or director change 8-K | Read ↗ |
| Aug 6, 2021 | Quarterly report 10-Q | Read ↗ |
| Aug 6, 2021 | Results announced 8-K | Read ↗ |
| May 28, 2021 | Executive or director changeShareholder vote 8-K | Read ↗ |
| May 10, 2021 | Quarterly report 10-Q | Read ↗ |
| May 10, 2021 | Results announced 8-K | Read ↗ |
| Mar 30, 2021 | Annual report 10-K/A | Read ↗ |
| Mar 16, 2021 | Acquisition or sale completed 8-K/A | Read ↗ |
| Feb 26, 2021 | Annual report 10-K | Read ↗ |
| Feb 5, 2021 | Results announced 8-K | Read ↗ |
| Jan 4, 2021 | Acquisition or sale completed 8-K | Read ↗ |
| Dec 21, 2020 | Executive or director change 8-K/A | Read ↗ |
| Dec 15, 2020 | Material agreement 8-K | Read ↗ |
| Dec 10, 2020 | Executive or director change 8-K | Read ↗ |
| Dec 1, 2020 | Executive or director change 8-K | Read ↗ |
| Nov 6, 2020 | Results announced 8-K | Read ↗ |
| Nov 6, 2020 | Quarterly report 10-Q | Read ↗ |
| Oct 1, 2020 | Material agreement 8-K | Read ↗ |
| Aug 7, 2020 | Quarterly report 10-Q | Read ↗ |
| Aug 7, 2020 | Results announced 8-K | Read ↗ |
| May 22, 2020 | Executive or director changeShareholder vote 8-K | Read ↗ |
| May 8, 2020 | Results announced 8-K | Read ↗ |
| May 8, 2020 | Quarterly report 10-Q | Read ↗ |
| Mar 30, 2020 | Annual report 10-K/A | Read ↗ |
| Mar 2, 2020 | Annual report 10-K | Read ↗ |
| Feb 5, 2020 | Results announced 8-K | Read ↗ |
| Nov 6, 2019 | Quarterly report 10-Q | Read ↗ |
| Nov 6, 2019 | Results announced 8-K | Read ↗ |
| Aug 30, 2019 | Executive or director change 8-K | Read ↗ |
| Aug 6, 2019 | Quarterly report 10-Q | Read ↗ |
| Aug 6, 2019 | Results announced 8-K | Read ↗ |
| May 24, 2019 | Shareholder vote 8-K | Read ↗ |
| May 6, 2019 | Quarterly report 10-Q | Read ↗ |
| May 6, 2019 | Results announced 8-K | Read ↗ |
| Mar 1, 2019 | Executive or director change 8-K | Read ↗ |
| Feb 27, 2019 | Annual report 10-K | Read ↗ |
| Feb 6, 2019 | Results announced 8-K | Read ↗ |
| Jan 7, 2019 | Executive or director change 8-K | Read ↗ |
| Nov 5, 2018 | Quarterly report 10-Q | Read ↗ |
| Nov 5, 2018 | Results announced 8-K | Read ↗ |
| Aug 24, 2018 | Executive or director change 8-K | Read ↗ |
| Aug 7, 2018 | Quarterly report 10-Q | Read ↗ |
| Aug 7, 2018 | Results announced 8-K | Read ↗ |
| May 29, 2018 | Executive or director changeShareholder vote 8-K | Read ↗ |
| May 2, 2018 | Quarterly report 10-Q | Read ↗ |
| May 2, 2018 | Results announced 8-K | Read ↗ |
| Apr 10, 2018 | Tender offer SC TO-I | Read ↗ |
| Apr 2, 2018 | Material agreement 8-K | Read ↗ |
| Mar 2, 2018 | Executive or director change 8-K | Read ↗ |
| Feb 28, 2018 | Annual report 10-K | Read ↗ |
| Feb 7, 2018 | Results announced 8-K | Read ↗ |
| Nov 8, 2017 | Quarterly report 10-Q | Read ↗ |
| Nov 8, 2017 | Results announced 8-K | Read ↗ |
| Sep 28, 2017 | Executive or director changeAcquisition or sale completedMaterial agreement 8-K | Read ↗ |
| Aug 28, 2017 | Shareholder vote 8-K/A | Read ↗ |
| Aug 25, 2017 | Executive or director change 8-K | Read ↗ |
| Aug 17, 2017 | Tender offer SC TO-I | Read ↗ |
| Aug 4, 2017 | Quarterly report 10-Q | Read ↗ |
| Aug 4, 2017 | Results announced 8-K | Read ↗ |
| May 31, 2017 | Shareholder vote 8-K | Read ↗ |
| May 2, 2017 | Material agreement 8-K | Read ↗ |
| May 2, 2017 | Executive or director change 8-K | Read ↗ |
| May 2, 2017 | Quarterly report 10-Q | Read ↗ |
| May 2, 2017 | Results announced 8-K | Read ↗ |
| Mar 6, 2017 | Executive or director change 8-K | Read ↗ |
| Feb 27, 2017 | Annual report 10-K | Read ↗ |
| Feb 7, 2017 | Results announced 8-K | Read ↗ |
| Nov 2, 2016 | Quarterly report 10-Q | Read ↗ |
| Nov 2, 2016 | Results announced 8-K | Read ↗ |
Source: White Mountains Insurance Group Ltd's EDGAR filing history, the last ten years. The labels are the form types and 8-K item numbers the company filed under, not a reading of what it wrote — an item 5.02 can be a chief executive fired or a director retiring on schedule — so each row links to the filing.
More on WTM
Company overviewEverything on WTM in one place, with the price.Insider tradingWhat WTM's own officers and directors buy and sell.LobbyingWhat WTM spends lobbying Congress, and on what.Who lobbies for itThe lobbyists on WTM's account, and who they worked for.Federal contractsWhat federal agencies pay WTM.AircraftThe jets on WTM's registration.