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WHITE MOUNTAINS INSURANCE GROUP LTD reported Common Stock Shares Outstanding of 2.48 million shares for the year ending 2025.
- WHITE MOUNTAINS INSURANCE GROUP LTD showed a decrease of -3.4% in Common Stock Shares Outstanding from 2024 to 2025.
- This data is from WHITE MOUNTAINS INSURANCE GROUP LTD's annual report (Form 10-K), filed with the SEC on February 27, 2026.
- XBRL data for this metric is available from 2009 to 2025 (17 years of filings). Earlier data may not exist in machine-readable XBRL format as companies adopted electronic filing at different times.
- Quarterly values from 10-Q filings: Q2 2010: 8.53 million shares | Q3 2010: 8.34 million shares | Q1 2011: 7.98 million shares | Q2 2011: 7.96 million shares | Q3 2011: 7.63 million shares | Q1 2012: 6.64 million shares | Q2 2012: 6.63 million shares | Q3 2012: 6.58 million shares | Q1 2013: 6.18 million shares | Q2 2013: 6.18 million shares | Q3 2013: 6.18 million shares | Q1 2014: 6.17 million shares | Q2 2014: 6.15 million shares | Q3 2014: 6.03 million shares | Q1 2015: 5.99 million shares | Q2 2015: 5.96 million shares | Q3 2015: 5.75 million shares | Q1 2016: 5.42 million shares | Q2 2016: 4.96 million shares | Q3 2016: 4.58 million shares | Q1 2017: 4.57 million shares | Q2 2017: 4.57 million shares | Q3 2017: 3.75 million shares | Q1 2018: 3.75 million shares | Q2 2018: 3.18 million shares | Q3 2018: 3.18 million shares | Q1 2019: 3.18 million shares | Q2 2019: 3.19 million shares | Q3 2019: 3.19 million shares | Q1 2020: 3.10 million shares | Q3 2020: 3.10 million shares | Q1 2021: 3.11 million shares | Q2 2021: 3.11 million shares | Q3 2021: 3.03 million shares | Q1 2022: 2.99 million shares | Q2 2022: 2.94 million shares | Q3 2022: 2.58 million shares | Q1 2023: 2.56 million shares | Q2 2023: 2.56 million shares | Q3 2023: 2.56 million shares | Q1 2024: 2.57 million shares | Q2 2024: 2.57 million shares | Q3 2024: 2.57 million shares | Q1 2025: 2.57 million shares | Q2 2025: 2.58 million shares | Q3 2025: 2.58 million shares.
- Over the full 17 years of available data (2009 to 2025), WHITE MOUNTAINS INSURANCE GROUP LTD's Common Stock Shares Outstanding has declined by 72.0%.
- Historical annual values: Fiscal year 2025: 2.48 million shares | Fiscal year 2024: 2.57 million shares | Fiscal year 2023: 2.56 million shares | Fiscal year 2022: 2.57 million shares | Fiscal year 2021: 3.02 million shares | Fiscal year 2020: 3.10 million shares | Fiscal year 2019: 3.19 million shares | Fiscal year 2018: 3.17 million shares | Fiscal year 2017: 3.75 million shares | Fiscal year 2016: 4.56 million shares | Fiscal year 2015: 5.62 million shares | Fiscal year 2014: 5.99 million shares | Fiscal year 2013: 6.18 million shares | Fiscal year 2012: 6.29 million shares | Fiscal year 2011: 7.58 million shares | Fiscal year 2010: 8.19 million shares | Fiscal year 2009: 8.86 million shares.
- Data sourced from SEC EDGAR public filings as of August 9, 2026.
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