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WHITE MOUNTAINS INSURANCE GROUP LTD — 11-K Filings

41 11-K filings on record

This page lists all 11-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 41 11-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
11-K 11-K 0000776867-25-000010 Jul 7, 2025 Dec 31, 2024
11-K 11-K 0000776867-24-000012 May 31, 2024 Dec 31, 2023
11-K 11-K 0000776867-23-000011 Jun 15, 2023 Dec 31, 2022
11-K 11-K 0000776867-22-000011 Jun 14, 2022 Dec 31, 2021
11-K 11-K 0000776867-21-000011 Jun 15, 2021 Dec 31, 2020
11-K 11-K 0000776867-20-000027 Jun 16, 2020 Dec 31, 2019
11-K 11-K 0000776867-19-000013 May 6, 2019 Dec 31, 2018
11-K 11-K 0000776867-18-000013 Jun 29, 2018 Dec 31, 2017
11-K 11-K 0000776867-16-000049 Jun 17, 2016 Dec 31, 2015
11-K 11-K 0000776867-15-000021 Jun 17, 2015 Dec 31, 2014
11-K 11-K 0001445305-14-002633 Jun 20, 2014 Dec 31, 2013
11-K 11-K 0001445305-13-001518 Jun 21, 2013 Dec 31, 2012
11-K 11-K 0001104659-12-045267 Jun 22, 2012 Dec 31, 2011
11-K 11-K 0001104659-11-036909 Jun 29, 2011 Dec 31, 2010
11-K 11-K 0001104659-11-036206 Jun 23, 2011 Dec 31, 2010
11-K 11-K 0001104659-10-034391 Jun 17, 2010 Dec 31, 2009
11-K 11-K 0001104659-10-034385 Jun 17, 2010 Dec 31, 2009
11-K 11-K 0001104659-09-039923 Jun 25, 2009 Dec 31, 2008
11-K 11-K 0001104659-09-038619 Jun 17, 2009 Dec 31, 2008
11-K 11-K 0001104659-08-042780 Jun 27, 2008 Dec 31, 2007
11-K 11-K 0001104659-08-042488 Jun 27, 2008 Dec 31, 2007
11-K 11-K 0001104659-07-051400 Jun 29, 2007 Dec 31, 2006
11-K 11-K 0001104659-07-050355 Jun 27, 2007 Dec 31, 2006
11-K ANNUAL REPORT OF EMPLOYEE STOCK PURCHASE, SAVINGS PLANS 0001104659-06-044255 Jun 29, 2006 Dec 31, 2005
11-K ANNUAL REPORT OF EMPLOYEE STOCK PURCHASE, SAVINGS PLANS 0001104659-06-044254 Jun 29, 2006 Dec 31, 2005
11-K 11-K 0001104659-05-030332 Jun 29, 2005 Dec 31, 2004
11-K 11-K 0001104659-05-030148 Jun 28, 2005 Dec 31, 2004
11-K 11-K 0001047469-04-021828 Jun 28, 2004 Dec 31, 2003
11-K 11-K 0001047469-04-021674 Jun 25, 2004 Dec 31, 2003
11-K FORM 11-K 0001047469-03-022833 Jun 30, 2003 Dec 31, 2002
11-K FORM 11-K 0001047469-03-022617 Jun 27, 2003 Dec 31, 2002
11-K FORM 11-K 0000912057-02-025534 Jun 27, 2002 Dec 31, 2001
11-K FORM 11-K 0000912057-02-025446 Jun 27, 2002 Dec 31, 2001
11-K FORM 11-K 0000912057-01-530376 Aug 27, 2001 Dec 31, 2000
11-K FORM 11-K 0000912057-01-523683 Jul 13, 2001 Dec 31, 2000
11-K FORM 11-K 0000912057-00-034215 Aug 2, 2000 Dec 31, 1999
11-K FORM 11-K 0001047469-99-026884 Jul 9, 1999 Dec 31, 1998
11-K FORM 11-K 0001047469-98-027797 Jul 20, 1998 Dec 31, 1997
11-K FORM 11-K 0000950124-97-003624 Jun 30, 1997 Dec 31, 1996
11-K FORM 11-K 0000950109-97-004768 Jun 27, 1997 Dec 31, 1996
11-K 11-K 0000950124-96-004193 Sep 27, 1996 Dec 31, 1995