WTM - Company ID 0000776867
WHITE MOUNTAINS INSURANCE GROUP LTD has filed 1,716 public company documents between 1994 and 2026. The most frequent type is insider trade (634 filings), alongside the regular cadence of annual reports, quarterly reports, and event disclosures every public company must make. Use the filters to focus on one filing type, or flip the sort to trace the company's history from its earliest paperwork.
Data parsed from SEC EDGAR XBRL filings. See the full market cap rankings.
| Type | Filing | Filed | Period covered | Open |
|---|---|---|---|---|
| 4 | Insider trade | 8mo ago2025-11-10 | 2025-11-10 | View filing |
| 10-Q | Quarterly report | 8mo ago2025-11-06 | 2025-09-30 | View filing |
| 8-K | Major company event | 8mo ago2025-11-06 | 2025-11-06 | View filing |
| 8-K | Major company event | 9mo ago2025-10-03 | 2025-10-02 | View filing |
| 8-K | Major company event | 10mo ago2025-09-03 | 2025-09-02 | View filing |
| 8-K | Major company event | 10mo ago2025-09-02 | 2025-09-02 | View filing |
| N-PX | N-PX | 10mo ago2025-08-27 | 2025-06-30 | View filing |
| 13F-HR | Institutional holdings | 11mo ago2025-08-11 | 2025-06-30 | View filing |
| 10-Q | Quarterly report | 11mo ago2025-08-07 | 2025-06-30 | View filing |
| 8-K | Major company event | 11mo ago2025-08-07 | 2025-08-07 | View filing |
| 8-K | Major company event | 11mo ago2025-07-18 | 2025-07-18 | View filing |
| 8-K | Major company event | 11mo ago2025-07-16 | 2025-07-16 | View filing |
| 11-K | Employee plan annual report | 1y ago2025-07-07 | 2024-12-31 | View filing |
| 8-K | Major company event | 1y ago2025-07-07 | 2025-07-04 | View filing |
| 8-K | Major company event | 1y ago2025-06-06 | 2025-06-06 | View filing |
| 4 | Insider trade | 1y ago2025-05-27 | 2025-05-22 | View filing |
| 4 | Insider trade | 1y ago2025-05-23 | 2025-05-22 | View filing |
| 4 | Insider trade | 1y ago2025-05-23 | 2025-05-22 | View filing |
| 4 | Insider trade | 1y ago2025-05-23 | 2025-05-22 | View filing |
| 4 | Insider trade | 1y ago2025-05-23 | 2025-05-22 | View filing |
| 4 | Insider trade | 1y ago2025-05-23 | 2025-05-22 | View filing |
| 4 | Insider trade | 1y ago2025-05-23 | 2025-05-22 | View filing |
| 4 | Insider trade | 1y ago2025-05-23 | 2025-05-22 | View filing |
| 4 | Insider trade | 1y ago2025-05-23 | 2025-05-22 | View filing |
| 8-K | Major company event | 1y ago2025-05-22 | 2025-05-22 | View filing |
| 13F-HR | Institutional holdings | 1y ago2025-05-12 | 2025-03-31 | View filing |
| 10-Q | Quarterly report | 1y ago2025-05-07 | 2025-03-31 | View filing |
| 8-K | Major company event | 1y ago2025-05-07 | 2025-05-07 | View filing |
| 8-K | Major company event | 1y ago2025-04-10 | 2025-04-10 | View filing |
| ARS | Annual report to shareholders | 1y ago2025-04-02 | 2024-12-31 | View filing |
| DEF 14A | Proxy statement | 1y ago2025-04-02 | 2025-05-22 | View filing |
| 4 | Insider trade | 1y ago2025-02-28 | 2025-02-26 | View filing |
| 4 | Insider trade | 1y ago2025-02-28 | 2025-02-26 | View filing |
| 4 | Insider trade | 1y ago2025-02-28 | 2025-02-26 | View filing |
| 4 | Insider trade | 1y ago2025-02-28 | 2025-02-26 | View filing |
| 4 | Insider trade | 1y ago2025-02-28 | 2025-02-26 | View filing |
| 10-K | Annual report | 1y ago2025-02-28 | 2024-12-31 | View filing |
| 13F-HR | Institutional holdings | 1y ago2025-02-12 | 2024-12-31 | View filing |
| 8-K | Major company event | 1y ago2025-02-07 | 2025-02-07 | View filing |
| 8-K | Major company event | 1y ago2025-01-08 | 2025-01-08 | View filing |
| 4 | Insider trade | 1y ago2025-01-03 | 2025-01-01 | View filing |
| 4 | Insider trade | 1y ago2025-01-03 | 2025-01-01 | View filing |
| 4 | Insider trade | 1y ago2025-01-03 | 2025-01-01 | View filing |
| 4 | Insider trade | 1y ago2025-01-03 | 2025-01-01 | View filing |
| 4 | Insider trade | 1y ago2024-12-02 | 2024-11-29 | View filing |
| 13F-HR | Institutional holdings | 1y ago2024-11-12 | 2024-09-30 | View filing |
| SC 13G/A | Passive ownership stake (update) | 1y ago2024-11-12 | - | View filing |
| 10-Q | Quarterly report | 1y ago2024-11-06 | 2024-09-30 | View filing |
| 8-K | Major company event | 1y ago2024-11-06 | 2024-11-06 | View filing |
| N-PX | N-PX | 1y ago2024-08-29 | 2024-06-30 | View filing |