WTM - CIK 0000776867
WHITE MOUNTAINS INSURANCE GROUP LTD has filed 1,719 documents with the SEC 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.
| Filing | Type | Filed | Period covered |
|---|---|---|---|
| Insider trade | 4 | 2013-05-28 | 2013-05-23 |
| Insider trade | 4 | 2013-05-28 | 2013-05-23 |
| Insider trade | 4 | 2013-05-28 | 2013-05-23 |
| Insider trade | 4 | 2013-05-28 | 2013-05-23 |
| Insider trade | 4 | 2013-05-28 | 2013-05-23 |
| Insider trade | 4 | 2013-05-28 | 2013-05-23 |
| Insider trade | 4 | 2013-05-28 | 2013-05-23 |
| Insider trade | 4 | 2013-05-17 | 2013-05-15 |
| Institutional holdings | 13F-HR | 2013-05-14 | 2013-03-31 |
| Insider trade | 4 | 2013-05-07 | 2013-05-06 |
| Annual report to shareholders | ARS | 2013-05-06 | 2012-12-31 |
| Major company event | 8-K | 2013-04-29 | 2013-04-29 |
| Quarterly report | 10-Q | 2013-04-29 | 2013-03-31 |
| Insider trade | 4 | 2013-04-11 | 2013-04-09 |
| DEFR14A | - | 2013-04-10 | - |
| Proxy statement | DEF 14A | 2013-04-04 | 2013-05-23 |
| Major company event | 8-K | 2013-04-04 | 2013-04-03 |
| Passive ownership stake | SC 13G | 2013-03-18 | - |
| Insider trade | 4 | 2013-03-08 | 2013-03-06 |
| Annual report | 10-K | 2013-03-01 | 2012-12-31 |
| Insider trade | 4 | 2013-03-01 | 2013-02-27 |
| Insider trade | 4 | 2013-03-01 | 2013-02-27 |
| Insider trade | 4 | 2013-03-01 | 2013-02-27 |
| Insider trade | 4 | 2013-03-01 | 2013-02-27 |
| Insider trade | 4 | 2013-03-01 | 2013-02-27 |
| Insider trade | 4 | 2013-03-01 | 2013-02-27 |
| Insider trade | 4 | 2013-03-01 | 2013-02-27 |
| New insider ownership | 3 | 2013-03-01 | 2013-02-27 |
| Major company event | 8-K | 2013-03-01 | 2013-02-27 |
| SEC correspondence | UPLOAD | 2013-02-22 | - |
| Company correspondence | CORRESP | 2013-02-19 | - |
| Passive ownership stake (update) | SC 13G/A | 2013-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 2013-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 2013-02-13 | - |
| Institutional holdings | 13F-HR | 2013-02-13 | 2012-12-31 |
| New insider ownership | 3 | 2013-02-06 | 2013-02-05 |
| Annual insider summary | 5 | 2013-02-06 | 2012-12-31 |
| Major company event | 8-K | 2013-02-05 | 2013-02-05 |
| Passive ownership stake (update) | SC 13G/A | 2013-01-30 | - |
| Company correspondence | CORRESP | 2013-01-18 | - |
| Insider trade | 4 | 2013-01-02 | 2012-12-31 |
| Insider trade | 4 | 2013-01-02 | 2012-12-31 |
| Insider trade | 4 | 2013-01-02 | 2012-12-31 |
| Insider trade | 4 | 2013-01-02 | 2012-12-31 |
| Insider trade | 4 | 2013-01-02 | 2012-12-31 |
| Insider trade | 4 | 2012-12-19 | 2012-12-17 |
| Insider trade | 4 | 2012-12-19 | 2012-12-17 |
| Company correspondence | CORRESP | 2012-12-17 | - |
| Insider trade | 4 | 2012-12-10 | 2012-12-07 |
| Insider trade | 4 | 2012-12-10 | 2012-11-26 |