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/A | Insider trade (amended) | 22y ago2003-12-30 | 2003-12-29 | View filing |
| 4 | Insider trade | 22y ago2003-12-29 | 2003-12-29 | View filing |
| 4 | Insider trade | 22y ago2003-12-12 | 2003-12-11 | View filing |
| 8-K | Major company event | 22y ago2003-12-09 | 2003-12-08 | View filing |
| 3 | New insider ownership | 22y ago2003-11-25 | 2003-11-20 | View filing |
| 3 | New insider ownership | 22y ago2003-11-25 | 2003-11-20 | View filing |
| 4 | Insider trade | 22y ago2003-11-13 | 2003-11-13 | View filing |
| 13F-HR | Institutional holdings | 22y ago2003-11-12 | 2003-09-30 | View filing |
| 10-Q | Quarterly report | 22y ago2003-11-04 | 2003-09-30 | View filing |
| 8-K | Major company event | 22y ago2003-11-03 | 2003-10-30 | View filing |
| 4 | Insider trade | 22y ago2003-10-17 | 2003-10-16 | View filing |
| 4 | Insider trade | 22y ago2003-10-10 | 2003-10-08 | View filing |
| 4 | Insider trade | 22y ago2003-10-09 | 2003-10-09 | View filing |
| 4 | Insider trade | 22y ago2003-09-11 | 2003-09-11 | View filing |
| 4 | Insider trade | 22y ago2003-08-14 | 2003-08-14 | View filing |
| 13F-HR | Institutional holdings | 22y ago2003-08-12 | 2003-06-30 | View filing |
| 8-K | Major company event | 22y ago2003-08-07 | 2003-08-07 | View filing |
| 10-Q | Quarterly report | 22y ago2003-08-04 | 2003-06-30 | View filing |
| S-3/A | S-3/A | 22y ago2003-07-17 | - | View filing |
| S-3/A | S-3/A | 23y ago2003-07-10 | - | View filing |
| 11-K | Employee plan annual report | 23y ago2003-06-30 | 2002-12-31 | View filing |
| 11-K | Employee plan annual report | 23y ago2003-06-27 | 2002-12-31 | View filing |
| S-3/A | S-3/A | 23y ago2003-06-27 | - | View filing |
| 10-Q/A | Quarterly report (amended) | 23y ago2003-06-26 | 2003-03-31 | View filing |
| 4 | Insider trade | 23y ago2003-06-24 | 2003-06-20 | View filing |
| 4 | Insider trade | 23y ago2003-06-10 | 2003-06-05 | View filing |
| 4 | Insider trade | 23y ago2003-06-09 | 2003-06-06 | View filing |
| 4 | Insider trade | 23y ago2003-06-09 | 2003-06-05 | View filing |
| 4 | Insider trade | 23y ago2003-06-03 | 2003-06-02 | View filing |
| 4 | Insider trade | 23y ago2003-06-03 | 2003-06-02 | View filing |
| 4 | Insider trade | 23y ago2003-06-03 | 2003-06-02 | View filing |
| 4 | Insider trade | 23y ago2003-06-03 | 2003-06-02 | View filing |
| 4 | Insider trade | 23y ago2003-05-27 | 2003-05-22 | View filing |
| 8-K | Major company event | 23y ago2003-05-22 | 2003-05-19 | View filing |
| 424B3 | 424B3 | 23y ago2003-05-16 | - | View filing |
| 13F-HR | Institutional holdings | 23y ago2003-05-15 | 2003-03-31 | View filing |
| 8-K | Major company event | 23y ago2003-05-14 | 2003-05-05 | View filing |
| 8-K/A | Major company event (amended) | 23y ago2003-05-13 | 2001-06-01 | View filing |
| 10-K/A | Annual report (amended) | 23y ago2003-05-13 | 2002-12-31 | View filing |
| 424B3 | 424B3 | 23y ago2003-05-13 | - | View filing |
| 10-Q | Quarterly report | 23y ago2003-05-09 | 2003-03-31 | View filing |
| 4 | Insider trade | 23y ago2003-05-08 | 2003-05-07 | View filing |
| 4 | Insider trade | 23y ago2003-05-08 | 2003-05-07 | View filing |
| 4 | Insider trade | 23y ago2003-05-08 | 2003-05-07 | View filing |
| 4 | Insider trade | 23y ago2003-05-08 | 2003-05-07 | View filing |
| 4 | Insider trade | 23y ago2003-05-08 | 2003-05-07 | View filing |
| 4 | Insider trade | 23y ago2003-05-08 | 2003-05-07 | View filing |
| 8-K | Major company event | 23y ago2003-05-06 | 2003-04-29 | View filing |
| 8-K | Major company event | 23y ago2003-04-10 | 2003-04-10 | View filing |
| 4 | Insider trade | 23y ago2003-04-08 | 2003-04-08 | View filing |