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 |
|---|---|---|---|---|
| SC 13D | Activist ownership stake | 19y ago2007-01-31 | - | View filing |
| SC 13D | Activist ownership stake | 22y ago2004-03-24 | - | View filing |
| SC 13D | Activist ownership stake | 26y ago2000-07-06 | - | View filing |
| SC 13D | Activist ownership stake | 26y ago1999-12-09 | - | View filing |
| SC 13D | Activist ownership stake | 27y ago1999-07-13 | - | View filing |
| SC 13D | Activist ownership stake | 29y ago1997-05-16 | - | View filing |
| SC 13D | Activist ownership stake | 30y ago1995-09-08 | - | View filing |
| SC 13D | Activist ownership stake | 31y ago1995-07-13 | - | View filing |
| SC 13D | Activist ownership stake | 31y ago1995-06-09 | - | View filing |