WHITE MOUNTAINS INSURANCE GROUP LTD - WTM
All tracked SEC files for this issuer. Showing up to 200 latest records.
Need parsed ownership details (13D/13G with shares/percent)?
Open ownership details
Form 4 = insider transactions report. Form 144 = notice of proposed sale (not a completed trade confirmation).
Files summary
Total files loaded: 28
Latest filed: Apr 01, 2026
| Form | Count |
|---|---|
| 4 | 17 |
| 8-K | 6 |
| SCHEDULE 13G/A | 3 |
| SCHEDULE 13G | 1 |
| 4/A | 1 |
Latest files
| Filed | Form | Report period | Accession | SEC |
|---|---|---|---|---|
| Apr 01, 2026 | 8-K | Apr 01, 2026 | 0001628280-26-022818 | View |
| Mar 27, 2026 | SCHEDULE 13G/A | — | 0000102909-26-002687 | View |
| Mar 20, 2026 | 4 | Mar 19, 2026 | 0000776867-26-000025 | View |
| Mar 05, 2026 | 4 | Mar 04, 2026 | 0000776867-26-000023 | View |
| Feb 27, 2026 | 4 | Feb 25, 2026 | 0000776867-26-000017 | View |
| Feb 27, 2026 | 4 | Feb 25, 2026 | 0000776867-26-000018 | View |
| Feb 27, 2026 | 4 | Feb 25, 2026 | 0000776867-26-000019 | View |
| Feb 27, 2026 | 4 | Feb 25, 2026 | 0000776867-26-000020 | View |
| Feb 27, 2026 | 4 | Feb 25, 2026 | 0000776867-26-000021 | View |
| Feb 26, 2026 | 8-K | Feb 26, 2026 | 0001628280-26-012417 | View |
| Feb 12, 2026 | SCHEDULE 13G/A | — | 0000895421-26-000047 | View |
| Feb 06, 2026 | 8-K | Feb 06, 2026 | 0001628280-26-005947 | View |
| Feb 05, 2026 | SCHEDULE 13G | — | 0001465109-26-000005 | View |
| Jan 07, 2026 | 8-K | Jan 07, 2026 | 0001628280-26-001102 | View |
| Jan 05, 2026 | 4 | Jan 01, 2026 | 0000776867-26-000010 | View |
| Jan 02, 2026 | 4 | Jan 01, 2026 | 0000776867-26-000006 | View |
| Jan 02, 2026 | 4 | Jan 01, 2026 | 0000776867-26-000007 | View |
| Jan 02, 2026 | 4 | Jan 01, 2026 | 0000776867-26-000009 | View |
| Dec 23, 2025 | 4 | Dec 23, 2025 | 0000776867-25-000034 | View |
| Dec 22, 2025 | 4 | Dec 19, 2025 | 0000776867-25-000029 | View |
| Dec 22, 2025 | 4 | Dec 19, 2025 | 0000776867-25-000030 | View |
| Dec 22, 2025 | 4/A | Dec 19, 2025 | 0000776867-25-000032 | View |
| Dec 16, 2025 | 4 | Dec 16, 2025 | 0000776867-25-000025 | View |
| Dec 08, 2025 | 8-K | Dec 05, 2025 | 0001628280-25-055702 | View |
| Nov 26, 2025 | 4 | Nov 25, 2025 | 0000776867-25-000021 | View |
| Nov 10, 2025 | 4 | Nov 10, 2025 | 0001318960-25-000008 | View |
| Nov 07, 2025 | SCHEDULE 13G/A | — | 0000895421-25-000548 | View |
| Nov 06, 2025 | 8-K | Nov 06, 2025 | 0001628280-25-049888 | View |