WHITE MOUNTAINS INSURANCE GROUP LTD - WTM
All tracked SEC files for this issuer. Showing up to 200 latest records.
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Open ownership details
Form 4 = insider transactions report. Form 144 = notice of proposed sale (not a completed trade confirmation).
Files summary
Total files loaded: 23
Latest filed: Aug 31, 2026
| Form | Count |
|---|---|
| 4 | 12 |
| 8-K | 7 |
| SCHEDULE 13G/A | 2 |
| SCHEDULE 13D/A | 1 |
| SCHEDULE 13G | 1 |
Latest files
| Filed | Form | Report period | Accession | SEC |
|---|---|---|---|---|
| Aug 31, 2026 | 4 | Aug 31, 2026 | 0000776867-26-000051 | View |
| Aug 27, 2026 | 8-K | Aug 26, 2026 | 0001628280-26-059191 | View |
| Aug 27, 2026 | 4 | Aug 26, 2026 | 0000776867-26-000049 | View |
| Aug 06, 2026 | 8-K | Aug 06, 2026 | 0001628280-26-053913 | View |
| Jun 05, 2026 | 8-K | Jun 05, 2026 | 0001628280-26-041051 | View |
| May 22, 2026 | 4 | May 21, 2026 | 0000776867-26-000036 | View |
| May 22, 2026 | 4 | May 21, 2026 | 0000776867-26-000037 | View |
| May 22, 2026 | 4 | May 21, 2026 | 0000776867-26-000038 | View |
| May 22, 2026 | 4 | May 21, 2026 | 0000776867-26-000040 | View |
| May 22, 2026 | 4 | May 21, 2026 | 0000776867-26-000041 | View |
| May 22, 2026 | 4 | May 21, 2026 | 0000776867-26-000042 | View |
| May 22, 2026 | 4 | May 21, 2026 | 0000776867-26-000043 | View |
| May 22, 2026 | 4 | May 21, 2026 | 0000776867-26-000044 | View |
| May 22, 2026 | 4 | May 21, 2026 | 0000776867-26-000045 | View |
| May 21, 2026 | 8-K | May 21, 2026 | 0001628280-26-037284 | View |
| May 15, 2026 | 8-K | May 14, 2026 | 0001628280-26-035349 | View |
| May 07, 2026 | SCHEDULE 13G/A | — | 0001465109-26-000020 | View |
| May 06, 2026 | 8-K | May 06, 2026 | 0001628280-26-030930 | View |
| May 01, 2026 | SCHEDULE 13D/A | — | 0000950157-26-000566 | View |
| Apr 30, 2026 | SCHEDULE 13G | — | 0002100119-26-001212 | View |
| 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 |