White Mountains Insurance Group SEC Filings
NYSE: WTMFinanceProperty-Casualty InsurersUSD
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At close: Oct 9, 4:00 PM ET · Delayed 15 min
White Mountains Insurance Group filing overview
This page lists 60 recent SEC filings by White Mountains Insurance Group (WTM), including 28 4, 18 8-K, 5 SCHEDULE 13G/A, 4 10-Q. The latest annual report (10-K) was filed on Feb 27, 2026 for the period ending Dec 31, 2025. The most recent quarterly report (10-Q) was filed on Aug 6, 2026.
The latest current report (8-K), used to disclose material events such as earnings releases and executive changes, was filed on Aug 27, 2026. Form 10-K is the audited annual report, 10-Q the quarterly report, 8-K covers material events, and Form 4 reports insider transactions. All documents link directly to SEC EDGAR.
Summary generated from market data by MetaCap's automated system. Methodology
WTM SEC filings
| Filed | Form | Description | Document |
|---|---|---|---|
| Aug 31, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Aug 27, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Aug 27, 2026 | 8-K | Departure or Appointment of Directors or Officers; Compensatory Arrangements | View on EDGAR |
| Aug 6, 2026 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Aug 6, 2026 | 10-Q | Quarterly report | View on EDGAR |
| Jun 5, 2026 | 8-K | Regulation FD Disclosure | View on EDGAR |
| May 22, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| May 22, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| May 22, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| May 22, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| May 22, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| May 22, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| May 22, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| May 22, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| May 22, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| May 21, 2026 | 8-K | Departure or Appointment of Directors or Officers; Compensatory Arrangements; Submission of Matters to a Vote of Security Holders | View on EDGAR |
| May 15, 2026 | 8-K | Entry into a Material Definitive Agreement; Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement | View on EDGAR |
| May 7, 2026 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| May 6, 2026 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| May 6, 2026 | 10-Q | Quarterly report | View on EDGAR |
| Apr 30, 2026 | SCHEDULE 13G | Beneficial ownership report (passive) | View on EDGAR |
| Apr 1, 2026 | DEF 14A | Definitive proxy statement | View on EDGAR |
| Apr 1, 2026 | 8-K | Other Events | View on EDGAR |
| Mar 27, 2026 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| Mar 20, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Mar 5, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Feb 27, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Feb 27, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Feb 27, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Feb 27, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Feb 27, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Feb 27, 2026 | 10-K | Annual report | View on EDGAR |
| Feb 26, 2026 | 8-K | Other Events | View on EDGAR |
| Feb 12, 2026 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| Feb 6, 2026 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Feb 5, 2026 | SCHEDULE 13G | Beneficial ownership report (passive) | View on EDGAR |
| Jan 7, 2026 | 8-K | Other Events | View on EDGAR |
| Jan 5, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Jan 2, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Jan 2, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Jan 2, 2026 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Dec 23, 2025 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Dec 22, 2025 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Dec 22, 2025 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Dec 22, 2025 | 4/A | AMENDED STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Dec 16, 2025 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Dec 8, 2025 | 8-K | Completion of Acquisition or Disposition of Assets; Other Events | View on EDGAR |
| Nov 26, 2025 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Nov 10, 2025 | 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | View on EDGAR |
| Nov 7, 2025 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| Nov 6, 2025 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Nov 6, 2025 | 10-Q | Quarterly report | View on EDGAR |
| Oct 3, 2025 | 8-K | Entry into a Material Definitive Agreement | View on EDGAR |
| Sep 3, 2025 | 8-K | Other Events | View on EDGAR |
| Sep 2, 2025 | 8-K | Departure or Appointment of Directors or Officers; Compensatory Arrangements | View on EDGAR |
| Aug 7, 2025 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Aug 7, 2025 | 10-Q | Quarterly report | View on EDGAR |
| Aug 7, 2025 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| Jul 18, 2025 | 8-K | Other Events | View on EDGAR |
| Jul 16, 2025 | 8-K | Other Events | View on EDGAR |