WHITE MOUNTAINS INSURANCE GROUP LTD

WTM - CIK 0000776867

Market cap$4.97 B

Rank#1410

SEC filings1,719

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
Annual insider summary	5	2012-02-02	2011-12-31
Passive ownership stake (update)	SC 13G/A	2012-02-01	-
Activist ownership stake (update)	SC 13D/A	2012-01-20	-
SEC correspondence	UPLOAD	2012-01-11	-
Company correspondence	CORRESP	2012-01-03	-
Insider trade	4	2011-12-28	2011-12-27
Insider trade	4	2011-12-21	2011-12-19
Insider trade	4	2011-12-21	2011-12-19
SEC correspondence	UPLOAD	2011-12-13	-
Insider trade	4	2011-12-05	2011-12-02
Insider trade	4	2011-12-01	2011-11-29
Major company event	8-K	2011-11-22	2011-11-16
Major company event	8-K	2011-11-18	2011-11-17
SC TO-I/A	-	2011-11-18	-
SC TO-I/A	-	2011-11-15	-
Institutional holdings	13F-HR	2011-11-14	2011-09-30
Quarterly report	10-Q	2011-10-28	2011-09-30
Major company event	8-K	2011-10-28	2011-10-28
SC TO-I/A	-	2011-10-19	-
SC TO-I	-	2011-10-17	-
SC TO-C	-	2011-10-14	-
Insider trade	4	2011-10-13	2011-10-11
Major company event (amended)	8-K/A	2011-10-12	2011-05-25
Major company event	8-K	2011-10-07	2011-10-07
Major company event	8-K	2011-09-23	2011-09-22
SC TO-I/A	-	2011-09-21	-
Insider trade	4	2011-09-20	2011-09-19
SC TO-I/A	-	2011-09-16	-
Company correspondence	CORRESP	2011-09-02	-
SC TO-I/A	-	2011-08-26	-
SEC correspondence	UPLOAD	2011-08-24	-
SC TO-I/A	-	2011-08-23	-
SC TO-I	-	2011-08-18	-
SC TO-C	-	2011-08-17	-
Major company event	8-K	2011-08-17	2011-08-17
Institutional holdings	13F-HR	2011-08-12	2011-06-30
Quarterly report	10-Q	2011-07-29	2011-06-30
Major company event	8-K	2011-07-29	2011-07-29
Insider trade	4	2011-07-15	2011-07-13
Employee plan annual report	11-K	2011-06-29	2010-12-31
Employee plan annual report	11-K	2011-06-23	2010-12-31
Major company event	8-K	2011-06-22	2011-06-22
Insider trade	4	2011-06-09	2011-06-07
Insider trade	4	2011-05-31	2011-05-26
Insider trade	4	2011-05-31	2011-05-27
Insider trade	4	2011-05-31	2011-05-27
Insider trade	4	2011-05-31	2011-05-26
Insider trade	4	2011-05-31	2011-05-26
Insider trade	4	2011-05-31	2011-05-26
Insider trade	4	2011-05-31	2011-05-26