Weighted Average Number of Shares Outstanding, Basic of WHITE MOUNTAINS INSURANCE GROUP LTD from 30 Jun 2010 to 31 Dec 2025

Taxonomy & unit
us-gaap: shares
Description
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
Summary
WHITE MOUNTAINS INSURANCE GROUP LTD quarterly and annual Weighted Average Number of Shares Outstanding, Basic in shares history and change rate from 30 Jun 2010 to 31 Dec 2025.
  • WHITE MOUNTAINS INSURANCE GROUP LTD Weighted Average Number of Shares Outstanding, Basic for the quarter ending 31 Dec 2025 was 2,534,300, a 0.08% increase year-over-year.
  • WHITE MOUNTAINS INSURANCE GROUP LTD annual Weighted Average Number of Shares Outstanding, Basic for 2025 was 2,534,300, a 0.08% increase from 2024.
  • WHITE MOUNTAINS INSURANCE GROUP LTD annual Weighted Average Number of Shares Outstanding, Basic for 2024 was 2,532,200, a 0.19% increase from 2023.
  • WHITE MOUNTAINS INSURANCE GROUP LTD annual Weighted Average Number of Shares Outstanding, Basic for 2023 was 2,527,300, a 11% decline from 2022.
Source SEC data
View on sec.gov
Weighted Average Number of Shares Outstanding, Basic, Quarterly (shares)
Weighted Average Number of Shares Outstanding, Basic, YoY Quarterly Change (%)
Weighted Average Number of Shares Outstanding, Basic, Annual (shares)
Weighted Average Number of Shares Outstanding, Basic, YoY Annual Change (%)

WHITE MOUNTAINS INSURANCE GROUP LTD Quarterly Weighted Average Number of Shares Outstanding, Basic (shares)

Period TTM Value Value YoY Chg Change % Start Date End Date Report Filed Fiscal Year Fiscal Period
Q4 2025 2,534,300 +2,100 +0.08% 01 Oct 2025 31 Dec 2025 10-K 27 Feb 2026 2025 FY
Q3 2025 2,542,300 +9,600 +0.38% 01 Jul 2025 30 Sep 2025 10-Q 06 Nov 2025 2025 Q3
Q2 2025 2,541,400 +9,600 +0.38% 01 Apr 2025 30 Jun 2025 10-Q 07 Aug 2025 2025 Q2
Q1 2025 2,540,900 +9,800 +0.39% 01 Jan 2025 31 Mar 2025 10-Q 07 May 2025 2025 Q1
Q4 2024 2,532,200 +4,900 +0.19% 01 Oct 2024 31 Dec 2024 10-K 27 Feb 2026 2025 FY
Q3 2024 2,532,700 +9,800 +0.39% 01 Jul 2024 30 Sep 2024 10-Q 06 Nov 2025 2025 Q3
Q2 2024 2,531,800 +7,000 +0.28% 01 Apr 2024 30 Jun 2024 10-Q 07 Aug 2025 2025 Q2
Q1 2024 2,531,100 -7,700 -0.3% 01 Jan 2024 31 Mar 2024 10-Q 07 May 2025 2025 Q1
Q4 2023 2,527,300 -298,900 -11% 01 Oct 2023 31 Dec 2023 10-K 27 Feb 2026 2025 FY
Q3 2023 2,522,900 -332,600 -12% 01 Jul 2023 30 Sep 2023 10-Q 06 Nov 2024 2024 Q3
Q2 2023 2,524,800 -415,900 -14% 01 Apr 2023 30 Jun 2023 10-Q 07 Aug 2024 2024 Q2
Q1 2023 2,538,800 -437,800 -15% 01 Jan 2023 31 Mar 2023 10-Q 09 May 2024 2024 Q1
Q4 2022 2,826,200 -216,300 -7.1% 01 Oct 2022 31 Dec 2022 10-K 28 Feb 2025 2024 FY
Q3 2022 2,855,500 -197,000 -6.5% 01 Jul 2022 30 Sep 2022 10-Q 06 Nov 2023 2023 Q3
Q2 2022 2,940,700 -129,300 -4.2% 01 Apr 2022 30 Jun 2022 10-Q 07 Aug 2023 2023 Q2
Q1 2022 2,976,600 -91,200 -3% 01 Jan 2022 31 Mar 2022 10-Q 09 May 2023 2023 Q1
Q4 2021 3,042,500 -38,900 -1.3% 01 Oct 2021 31 Dec 2021 10-K 26 Feb 2024 2023 FY
Q3 2021 3,052,500 -6,200 -0.2% 01 Jul 2021 30 Sep 2021 10-Q 07 Nov 2022 2022 Q3
Q2 2021 3,070,000 +5,600 +0.18% 01 Apr 2021 30 Jun 2021 10-Q 08 Aug 2022 2022 Q2
Q1 2021 3,067,800 -76,400 -2.4% 01 Jan 2021 31 Mar 2021 10-Q 06 May 2022 2022 Q1
Q4 2020 3,081,400 -59,700 -1.9% 01 Oct 2020 31 Dec 2020 10-K 27 Feb 2023 2022 FY
Q3 2020 3,058,700 -83,300 -2.7% 01 Jul 2020 30 Sep 2020 10-Q 08 Nov 2021 2021 Q3
Q2 2020 3,064,400 -76,300 -2.4% 01 Apr 2020 30 Jun 2020 10-Q 06 Aug 2021 2021 Q2
Q1 2020 3,144,200 +4,500 +0.14% 01 Jan 2020 31 Mar 2020 10-Q 10 May 2021 2021 Q1
Q4 2019 3,141,100 -201,300 -6% 01 Oct 2019 31 Dec 2019 10-K 28 Feb 2022 2021 FY
Q3 2019 3,142,000 +3,100 +0.1% 01 Jul 2019 30 Sep 2019 10-Q 06 Nov 2020 2020 Q3
Q2 2019 3,140,700 -249,800 -7.4% 01 Apr 2019 30 Jun 2019 10-Q 07 Aug 2020 2019 Q2
Q1 2019 3,139,700 -570,500 -15% 01 Jan 2019 31 Mar 2019 10-Q 08 May 2020 2019 Q3
Q4 2018 3,342,400 -897,100 -21% 01 Oct 2018 31 Dec 2018 10-K 26 Feb 2021 2020 FY
Q3 2018 3,138,900 -1,104,600 -26% 01 Jul 2018 30 Sep 2018 10-Q 06 Nov 2019 2019 Q3
Q2 2018 3,390,500 -1,124,400 -25% 01 Apr 2018 30 Jun 2018 10-Q 06 Aug 2019 2019 Q2
Q1 2018 3,710,200 -801,900 -18% 01 Jan 2018 31 Mar 2018 10-Q 06 May 2019 2019 Q1
Q4 2017 4,239,500 -710,600 -14% 01 Oct 2017 31 Dec 2017 10-K 02 Mar 2020 2019 FY
Q3 2017 4,243,500 -555,800 -12% 01 Jul 2017 30 Sep 2017 10-Q 05 Nov 2018 2018 Q3
Q2 2017 4,514,900 -514,700 -10% 01 Apr 2017 30 Jun 2017 10-Q 07 Aug 2018 2018 Q2
Q1 2017 4,512,100 -973,500 -18% 01 Jan 2017 31 Mar 2017 10-Q 02 May 2018 2018 Q1
Q4 2016 4,950,100 -861,100 -15% 01 Oct 2016 31 Dec 2016 10-K 27 Feb 2019 2018 FY
Q3 2016 4,799,300 -1,090,800 -19% 01 Jul 2016 30 Sep 2016 10-Q 08 Nov 2017 2017 Q3
Q2 2016 5,029,600 -884,700 -15% 01 Apr 2016 30 Jun 2016 10-Q 04 Aug 2017 2017 Q2
Q1 2016 5,485,600 -434,000 -7.3% 01 Jan 2016 31 Mar 2016 10-Q 02 May 2017 2017 Q1
Q4 2015 5,811,200 -214,800 -3.6% 01 Oct 2015 31 Dec 2015 10-K 28 Feb 2018 2017 FY
Q3 2015 5,890,100 -201,300 -3.3% 01 Jul 2015 30 Sep 2015 10-Q 02 Nov 2016 2016 Q3
Q2 2015 5,914,300 -166,600 -2.7% 01 Apr 2015 30 Jun 2015 10-Q 03 Aug 2016 2016 Q2
Q1 2015 5,919,600 -179,900 -2.9% 01 Jan 2015 31 Mar 2015 10-Q 02 May 2016 2016 Q1
Q4 2014 6,026,000 -83,000 -1.4% 01 Oct 2014 31 Dec 2014 10-K 27 Feb 2017 2016 FY
Q3 2014 6,091,400 +10,300 +0.17% 01 Jul 2014 30 Sep 2014 10-Q 02 Nov 2015 2015 Q3
Q2 2014 6,080,900 +100 +0% 01 Apr 2014 30 Jun 2014 10-Q 03 Aug 2015 2015 Q2
Q1 2014 6,099,500 -95,000 -1.5% 01 Jan 2014 31 Mar 2014 10-Q 04 May 2015 2015 Q1
Q4 2013 6,109,000 -599,700 -8.9% 01 Oct 2013 31 Dec 2013 10-K 29 Feb 2016 2015 FY
Q3 2013 6,081,100 -412,800 -6.4% 01 Jul 2013 30 Sep 2013 10-Q 29 Oct 2014 2014 Q3
Q2 2013 6,080,800 -464,400 -7.1% 01 Apr 2013 30 Jun 2013 10-Q 29 Jul 2014 2014 Q2
Q1 2013 6,194,500 -1,158,900 -16% 01 Jan 2013 31 Mar 2013 10-Q 28 Apr 2014 2014 Q1
Q4 2012 6,708,700 -1,102,900 -14% 01 Oct 2012 31 Dec 2012 10-K 27 Feb 2015 2014 FY
Q3 2012 6,493,900 -1,351,900 -17% 01 Jul 2012 30 Sep 2012 10-Q 28 Oct 2013 2013 Q3
Q2 2012 6,545,200 -1,340,300 -17% 01 Apr 2012 30 Jun 2012 10-Q 30 Jul 2013 2013 Q2
Q1 2012 7,353,400 -621,300 -7.8% 01 Jan 2012 31 Mar 2012 10-Q 29 Apr 2013 2013 Q1
Q4 2011 7,811,600 01 Oct 2011 31 Dec 2011 10-K 28 Feb 2012 2011 FY
Q3 2011 7,845,800 -585,200 -6.9% 01 Jul 2011 30 Sep 2011 10-Q 30 Oct 2012 2012 Q3
Q2 2011 7,885,500 -785,500 -9.1% 01 Apr 2011 30 Jun 2011 10-Q 27 Jul 2012 2012 Q2
Q1 2011 7,974,700 01 Jan 2011 31 Mar 2011 10-Q 27 Apr 2012 2012 Q1
Q3 2010 8,431,000 01 Jul 2010 30 Sep 2010 10-Q 28 Oct 2011 2011 Q3
Q2 2010 8,671,000 01 Apr 2010 30 Jun 2010 10-Q 29 Jul 2011 2011 Q2

WHITE MOUNTAINS INSURANCE GROUP LTD Annual Weighted Average Number of Shares Outstanding, Basic (shares)

Period Value YoY Chg Change % Start Date End Date Report Filed Fiscal Year Fiscal Period
2025 2,534,300 +2,100 +0.08% 01 Jan 2025 31 Dec 2025 10-K 27 Feb 2026 2025 FY
2024 2,532,200 +4,900 +0.19% 01 Jan 2024 31 Dec 2024 10-K 27 Feb 2026 2025 FY
2023 2,527,300 -298,900 -11% 01 Jan 2023 31 Dec 2023 10-K 27 Feb 2026 2025 FY
2022 2,826,200 -216,300 -7.1% 01 Jan 2022 31 Dec 2022 10-K 28 Feb 2025 2024 FY
2021 3,042,500 -38,900 -1.3% 01 Jan 2021 31 Dec 2021 10-K 26 Feb 2024 2023 FY
2020 3,081,400 -59,700 -1.9% 01 Jan 2020 31 Dec 2020 10-K 27 Feb 2023 2022 FY
2019 3,141,100 -201,300 -6% 01 Jan 2019 31 Dec 2019 10-K 28 Feb 2022 2021 FY
2018 3,342,400 -897,100 -21% 01 Jan 2018 31 Dec 2018 10-K 26 Feb 2021 2020 FY
2017 4,239,500 -710,600 -14% 01 Jan 2017 31 Dec 2017 10-K 02 Mar 2020 2019 FY
2016 4,950,100 -861,100 -15% 01 Jan 2016 31 Dec 2016 10-K 27 Feb 2019 2018 FY
2015 5,811,200 -214,800 -3.6% 01 Jan 2015 31 Dec 2015 10-K 28 Feb 2018 2017 FY
2014 6,026,000 -83,000 -1.4% 01 Jan 2014 31 Dec 2014 10-K 27 Feb 2017 2016 FY
2013 6,109,000 -599,700 -8.9% 01 Jan 2013 31 Dec 2013 10-K 29 Feb 2016 2015 FY
2012 6,708,700 -1,102,900 -14% 01 Jan 2012 31 Dec 2012 10-K 27 Feb 2015 2014 FY
2011 7,811,600 -639,500 -7.6% 31 Dec 2010 31 Dec 2011 10-K 28 Feb 2012 2011 FY
2010 8,451,100 31 Dec 2009 31 Dec 2010 10-K 28 Feb 2012 2011 FY
* An asterisk sign (*) next to the value indicates that the value is likely invalid.