WHITE MOUNTAINS INSURANCE GROUP LTD — All Filings
1,000 total filings on record
Public companies registered with the SEC are required to file periodic reports, disclosures, and notices throughout the year. The most important are the 10-K (annual report), 10-Q (quarterly report), and 8-K (material event notice). Use the filters below to narrow by form type.
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UPLOAD
| Form | Description | Accession Number | Filed | Period |
|---|---|---|---|---|
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-010302 | May 23, 2025 | May 22, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-010295 | May 23, 2025 | May 22, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-010297 | May 23, 2025 | May 22, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-010296 | May 23, 2025 | May 22, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-010300 | May 23, 2025 | May 22, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-010298 | May 23, 2025 | May 22, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-010301 | May 23, 2025 | May 22, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-010299 | May 23, 2025 | May 22, 2025 |
| 8-K | 8-K | 0000776867-25-000007 | May 22, 2025 | — |
| 13F-HR | — | 0001104659-25-047309 | May 12, 2025 | Mar 31, 2025 |
| 10-Q | 10-Q | 0000776867-25-000006 | May 7, 2025 | Mar 31, 2025 |
| 8-K | 8-K | 0000776867-25-000005 | May 7, 2025 | — |
| 8-K | 8-K | 0000776867-25-000004 | Apr 10, 2025 | — |
| DEF 14A | DEF 14A | 0001104659-25-031124 | Apr 2, 2025 | May 22, 2025 |
| ARS | ARS | 0001104659-25-031128 | Apr 2, 2025 | Dec 31, 2024 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-003865 | Feb 28, 2025 | Feb 26, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-003860 | Feb 28, 2025 | Feb 26, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-003864 | Feb 28, 2025 | Feb 26, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-003859 | Feb 28, 2025 | Feb 26, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-003866 | Feb 28, 2025 | Feb 26, 2025 |
| 10-K | 10-K | 0000776867-25-000003 | Feb 28, 2025 | Dec 31, 2024 |
| 13F-HR | — | 0001104659-25-012202 | Feb 12, 2025 | Dec 31, 2024 |
| 8-K | 8-K | 0000776867-25-000002 | Feb 7, 2025 | — |
| 8-K | 8-K | 0000776867-25-000001 | Jan 8, 2025 | — |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-000039 | Jan 3, 2025 | Jan 1, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-000040 | Jan 3, 2025 | Jan 1, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-000038 | Jan 3, 2025 | Jan 1, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-25-000037 | Jan 3, 2025 | Jan 1, 2025 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-24-019864 | Dec 2, 2024 | Nov 29, 2024 |
| 13F-HR | — | 0001104659-24-116806 | Nov 12, 2024 | Sep 30, 2024 |
| SC 13G/A | — | 0001082327-24-000118 | Nov 12, 2024 | — |
| 8-K | 8-K | 0000776867-24-000018 | Nov 6, 2024 | — |
| 10-Q | 10-Q | 0000776867-24-000019 | Nov 6, 2024 | Sep 30, 2024 |
| N-PX | — | 0001104659-24-094981 | Aug 29, 2024 | Jun 30, 2024 |
| 13F-HR | — | 0001104659-24-087260 | Aug 8, 2024 | Jun 30, 2024 |
| 8-K | 8-K | 0000776867-24-000014 | Aug 7, 2024 | — |
| 10-Q | 10-Q | 0000776867-24-000015 | Aug 7, 2024 | Jun 30, 2024 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-24-012249 | Jun 10, 2024 | — |
| 3 | INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-24-012248 | Jun 10, 2024 | — |
| 8-K | 8-K | 0000776867-24-000013 | Jun 7, 2024 | — |
| 11-K | 11-K | 0000776867-24-000012 | May 31, 2024 | Dec 31, 2023 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-24-011192 | May 24, 2024 | May 23, 2024 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-24-011184 | May 24, 2024 | May 23, 2024 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-24-011185 | May 24, 2024 | May 23, 2024 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-24-011186 | May 24, 2024 | May 23, 2024 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-24-011187 | May 24, 2024 | May 23, 2024 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-24-011188 | May 24, 2024 | May 23, 2024 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-24-011189 | May 24, 2024 | May 23, 2024 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-24-011190 | May 24, 2024 | May 23, 2024 |
| 4 | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 0001062993-24-011191 | May 24, 2024 | May 23, 2024 |