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WHITE MOUNTAINS INSURANCE GROUP LTD — 10-K Filings

30 10-K filings on record

This page lists all 10-K filings submitted to the SEC by WHITE MOUNTAINS INSURANCE GROUP LTD (WTM), sorted by most recent first. Each row links to the full filing on EdgarLookup. WHITE MOUNTAINS INSURANCE GROUP LTD has filed 30 10-K documents with the SEC since 2009. To view all SEC filings by WHITE MOUNTAINS INSURANCE GROUP LTD, see the full filings list.

Overview All Filings Financials Insiders
All 10-K 10-K/A 10-K405 10-Q 10-Q/A 11-K 13F-HR 13F-NT 3 3/A 4 4/A 424B3 5 8-A12B 8-K 8-K/A ARS CORRESP DEF 14A DEFA14A DEFM14A DEFR14A N-PX NT 11-K PRE 14A S-3 S-3/A S-8 S-8 POS SC 13D SC 13D/A SC 13E4 SC 13E4/A SC 13G SC 13G/A SC TO-C SC TO-I SC TO-I/A SC TO-T SC TO-T/A SCHEDULE 13D/A SCHEDULE 13G SCHEDULE 13G/A UPLOAD
Form Description Accession Number Filed Period
10-K 10-K 0001628280-26-012603 Feb 27, 2026 Dec 31, 2025
10-K 10-K 0000776867-25-000003 Feb 28, 2025 Dec 31, 2024
10-K 10-K 0000776867-24-000005 Feb 26, 2024 Dec 31, 2023
10-K 10-K 0000776867-23-000004 Feb 27, 2023 Dec 31, 2022
10-K 10-K 0000776867-22-000002 Feb 28, 2022 Dec 31, 2021
10-K 10-K 0000776867-21-000004 Feb 26, 2021 Dec 31, 2020
10-K 10-K 0000776867-20-000009 Mar 2, 2020 Dec 31, 2019
10-K 10-K 0000776867-19-000008 Feb 27, 2019 Dec 31, 2018
10-K 10-K 0000776867-18-000002 Feb 28, 2018 Dec 31, 2017
10-K 10-K 0000776867-17-000005 Feb 27, 2017 Dec 31, 2016
10-K 10-K 0000776867-16-000036 Feb 29, 2016 Dec 31, 2015
10-K 10-K 0000776867-15-000007 Feb 27, 2015 Dec 31, 2014
10-K 10-K 0001445305-14-000693 Feb 28, 2014 Dec 31, 2013
10-K 10-K 0001445305-13-000401 Mar 1, 2013 Dec 31, 2012
10-K 10-K 0001104659-12-014041 Feb 28, 2012 Dec 31, 2011
10-K 10-K 0001104659-11-010544 Feb 28, 2011 Dec 31, 2010
10-K 10-K 0001104659-10-010195 Feb 26, 2010 Dec 31, 2009
10-K 10-K 0001104659-09-013179 Feb 27, 2009 Dec 31, 2008
10-K 10-K 0001047469-08-001968 Feb 29, 2008 Dec 31, 2007
10-K 10-K 0001104659-07-014982 Feb 28, 2007 Dec 31, 2006
10-K ANNUAL REPORT PURSUANT TO SECTION 13 AND 15(D) 0001104659-06-014685 Mar 7, 2006 Dec 31, 2005
10-K FORM 10-K 0001047469-05-005178 Mar 2, 2005 Dec 31, 2004
10-K 10-K 0001104659-04-006082 Mar 2, 2004 Dec 31, 2003
10-K FORM 10-K 0001047469-03-011319 Mar 31, 2003 Dec 31, 2002
10-K FORM 10-K 0000912057-02-013123 Apr 1, 2002 Dec 31, 2001
10-K FORM 10-K 0000912057-01-008454 Mar 27, 2001 Dec 31, 2000
10-K FORM 10-K 0000912057-00-013985 Mar 28, 2000 Dec 31, 1999
10-K 10-K 0001047469-99-012441 Mar 30, 1999 Dec 31, 1998
10-K FORM 10-K 0001047469-98-012300 Mar 30, 1998 Dec 31, 1997
10-K FORM 10-K A/R 0000899243-97-000504 Mar 28, 1997 Dec 31, 1996