White Mountains Insurance Group Ltd.
WTM | NYSE
$2,056.85
-$4.45 (-0.22%)
At close: Sep 21, 2026, 4:00 PM ET
$2,056.85
$0 (0.00%)
After-hours:
Sep 21, 2026, 6:22 PM ET
Market Cap History History
Annual Market Cap Change Annual Change
| Date | Market Cap | Change | % Change |
|---|---|---|---|
| Sep 17, 2026 | $4.96B | -$278.44M | -5.31% |
| Dec 25, 2025 | $5.24B | $381.09M | +7.84% |
| Dec 26, 2024 | $4.86B | $1.06B | +28.00% |
| Dec 28, 2023 | $3.8B | -$241.63M | -5.98% |
| Dec 29, 2022 | $4.04B | $979.2M | +32.01% |
| Dec 30, 2021 | $3.06B | -$44.72M | -1.44% |
| Dec 30, 2020 | $3.1B | -$345.84M | -10.02% |
| Dec 26, 2019 | $3.45B | $768.95M | +28.68% |
| Dec 27, 2018 | $2.68B | -$931.38M | -25.78% |
| Dec 28, 2017 | $3.61B | -$400.05M | -9.97% |
| Dec 29, 2016 | $4.01B | -$108.44M | -2.63% |
| Dec 30, 2015 | $4.12B | $197.37M | +5.03% |
| Dec 25, 2014 | $3.92B | $262.71M | +7.18% |
| Dec 26, 2013 | $3.66B | $334.26M | +10.05% |
| Dec 27, 2012 | $3.33B | -$231.19M | -6.50% |
| Dec 29, 2011 | $3.56B | $881.35M | +32.93% |
| Dec 30, 2010 | $2.68B | -$262.31M | -8.93% |
| Dec 30, 2009 | $2.94B | $403.6M | +15.92% |
| Dec 25, 2008 | $2.54B | -$2.95B | -53.77% |
| Dec 27, 2007 | $5.48B | -$756.82M | -12.13% |
| Dec 28, 2006 | $6.24B | n/a | n/a |
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