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 | 2012-12-04 | 2012-11-30 |
| SEC correspondence | UPLOAD | 2012-11-30 | - |
| Institutional holdings | 13F-HR | 2012-11-14 | 2012-09-30 |
| Quarterly report | 10-Q | 2012-10-30 | 2012-09-30 |
| Major company event | 8-K | 2012-10-30 | 2012-10-30 |
| Major company event | 8-K | 2012-10-18 | 2012-10-18 |
| Institutional holdings | 13F-HR | 2012-08-13 | 2012-06-30 |
| Insider trade | 4 | 2012-08-10 | 2012-01-20 |
| Quarterly report | 10-Q | 2012-07-27 | 2012-06-30 |
| Major company event | 8-K | 2012-07-27 | 2012-07-27 |
| Insider trade | 4 | 2012-07-13 | 2012-07-11 |
| Employee plan annual report | 11-K | 2012-06-22 | 2011-12-31 |
| Major company event | 8-K | 2012-06-13 | 2012-06-13 |
| Major company event | 8-K | 2012-05-30 | 2012-05-24 |
| Insider trade | 4 | 2012-05-29 | 2012-05-24 |
| Insider trade | 4 | 2012-05-29 | 2012-05-24 |
| Insider trade | 4 | 2012-05-29 | 2012-05-24 |
| Insider trade | 4 | 2012-05-29 | 2012-05-24 |
| Insider trade | 4 | 2012-05-29 | 2012-05-24 |
| Insider trade | 4 | 2012-05-29 | 2012-05-24 |
| Insider trade | 4 | 2012-05-29 | 2012-05-24 |
| Institutional holdings | 13F-HR | 2012-05-14 | 2012-03-31 |
| Annual report to shareholders | ARS | 2012-05-08 | 2011-12-31 |
| Annual report to shareholders | ARS | 2012-05-04 | 2011-12-31 |
| Quarterly report | 10-Q | 2012-04-27 | 2012-03-31 |
| Major company event | 8-K | 2012-04-27 | 2012-04-27 |
| Major company event | 8-K | 2012-04-05 | 2012-04-05 |
| Proxy statement | DEF 14A | 2012-04-03 | 2012-05-24 |
| New insider ownership | 3 | 2012-04-02 | 2012-03-28 |
| SC TO-I/A | - | 2012-03-28 | - |
| SC TO-I/A | - | 2012-03-23 | - |
| SC TO-I/A | - | 2012-03-08 | - |
| SC TO-I/A | - | 2012-02-29 | - |
| Annual report | 10-K | 2012-02-28 | 2011-12-31 |
| Insider trade | 4 | 2012-02-24 | 2012-02-22 |
| Insider trade | 4 | 2012-02-24 | 2012-02-22 |
| Insider trade | 4 | 2012-02-24 | 2012-02-22 |
| Insider trade | 4 | 2012-02-24 | 2012-02-22 |
| Insider trade | 4 | 2012-02-24 | 2012-02-22 |
| Insider trade | 4 | 2012-02-24 | 2012-02-22 |
| Major company event | 8-K | 2012-02-24 | 2012-02-22 |
| SC TO-I | - | 2012-02-24 | - |
| SC TO-C | - | 2012-02-23 | - |
| Insider trade | 4 | 2012-02-16 | 2012-02-14 |
| Institutional holdings | 13F-HR | 2012-02-13 | 2011-12-31 |
| Passive ownership stake (update) | SC 13G/A | 2012-02-06 | - |
| Passive ownership stake (update) | SC 13G/A | 2012-02-03 | - |
| Passive ownership stake (update) | SC 13G/A | 2012-02-03 | - |
| Major company event | 8-K | 2012-02-03 | 2012-02-03 |
| Annual insider summary | 5 | 2012-02-02 | 2011-12-31 |