White Mountains Insurance Group - 15 Year Stock Price History | WTM

Historical daily share price chart and data for White Mountains Insurance Group since 2011 adjusted for splits and dividends. The latest closing stock price for White Mountains Insurance Group as of September 18, 2026 is 2061.30.
  • The all-time high White Mountains Insurance Group stock closing price was 2319.41 on April 17, 2026.
  • The White Mountains Insurance Group 52-week high stock price is 2333.00, which is 13.2% above the current share price.
  • The White Mountains Insurance Group 52-week low stock price is 1648.00, which is 20.1% below the current share price.
  • The average White Mountains Insurance Group stock price for the last 52 weeks is 2079.15.
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White Mountains Insurance Group Historical Annual Stock Price Data
Year Average Stock Price Year Open Year High Year Low Year Close Annual % Change
2026 2137.1340 2040.9700 2319.4100 1989.5400 2061.3000 -0.76%
2025 1849.2061 1927.1700 2089.9500 1649.7500 2077.0800 6.89%
2024 1768.6965 1507.6300 2013.0100 1472.7200 1943.1400 29.31%
2023 1463.7752 1393.6100 1604.6200 1317.0100 1502.6800 6.49%
2022 1212.5550 1006.9800 1419.5700 1003.1200 1411.1000 39.63%
2021 1110.7476 1010.4600 1262.3600 983.7130 1010.6300 1.41%
2020 930.7237 1116.9600 1158.3600 693.2050 996.5840 -10.19%
2019 1002.1739 849.5520 1123.1400 845.3290 1109.6100 30.20%
2018 875.7578 841.6110 972.7720 783.0590 852.2250 0.88%
2017 867.3871 842.2260 938.7800 832.2230 844.8170 1.93%
2016 799.8806 712.9720 860.4660 692.5270 828.7930 15.17%
2015 695.5911 624.7800 799.9800 610.9400 719.5960 15.52%
2014 602.9950 592.9770 667.0020 551.9230 622.9110 4.66%
2013 569.7332 515.7010 602.4910 515.7010 595.1680 17.31%
2012 500.7283 448.1490 539.5110 432.5180 507.3280 13.80%
Sector Industry Market Cap Revenue
Finance Property, Casualty and Title Insurance $4.920B $3.735B
White Mountains Insurance Group, Ltd. is engaged in the business of property and casualty insurance and reinsurance.
Stock Name Country Market Cap PE Ratio
Berkshire Hathaway (BRK.B) United States $1091.270B 22.90
Berkshire Hathaway (BRK.A) United States $1089.734B 22.86
Chubb (CB) Switzerland $131.419B 11.71
Progressive (PGR) United States $124.111B 11.52
Sampo (SAXPY) Finland $114.831B 17.02
Tokio Marine Holdings (TKOMY) Japan $101.400B 19.35
Travelers (TRV) United States $78.136B 10.12
Allstate (ALL) United States $63.172B 5.54
MS&AD Insurances (MSADY) Japan $49.448B 7.70
Hartford Insurance (HIG) United States $35.725B 9.19
Fairfax Financial Holdings (FRFHF) Canada $33.460B 7.87
Arch Capital Group (ACGL) Bermuda $33.062B 8.96
Intact Financial (IFCZF) Canada $32.407B 14.58
W.R Berkley (WRB) United States $25.982B 14.58
Cincinnati Financial (CINF) United States $25.938B 17.33
RenaissanceRe Holdings (RNR) Bermuda $13.592B 5.88
CNA Financial (CNA) United States $12.994B 10.26
American Financial (AFG) United States $11.800B 12.24
Kinsale Capital (KNSL) United States $8.128B 16.47
Hanover Insurance (THG) United States $7.915B 10.60
Axis Capital Holdings (AXS) Bermuda $7.238B 7.77
First American Financial (FAF) United States $7.105B 9.80
Essent Group (ESNT) Bermuda $6.039B 9.37
Mercury General (MCY) United States $5.591B 6.94
RLI (RLI) United States $5.450B 17.31
Selective Insurance (SIGI) United States $5.165B 10.89
Hagerty (HGTY) United States $4.790B 92.93
Palomar Holdings (PLMR) United States $3.579B 16.94
NMI Holdings Inc (NMIH) United States $3.227B 8.46
Skyward Specialty Insurance (SKWD) United States $2.500B 11.81
HCI (HCI) United States $2.334B 8.09
Stewart Information Services (STC) United States $1.928B 11.57
Safety Insurance (SAFT) United States $1.520B 24.07
Exzeo (XZO) United States $1.492B 16.90
United Fire (UFCS) United States $1.398B 9.96
ProAssurance (PRA) United States $1.290B 14.37
UNIVERSAL INSURANCE HOLDINGS INC (UVE) United States $1.229B 5.99
Bowhead Specialty Holdings (BOW) United States $1.112B 17.76
Heritage Insurance Holdings (HRTG) United States $1.023B 4.90
Donegal (DGICB) United States $0.781B 12.17
Root (ROOT) United States $0.772B 14.36
Donegal (DGICA) United States $0.695B 10.02
Investors Title (ITIC) United States $0.546B 13.54
American Integrity Insurance (AII) United States $0.518B 5.71
Greenlight Capital Re (GLRE) Cayman Islands $0.491B 10.22
American Coastal Insurance (ACIC) United States $0.434B 4.99
Global Indemnity (GBLI) United States $0.381B 9.73
Kingsway Financial Services (KFS) United States $0.329B 0.00
NI Holdings (NODK) United States $0.305B 39.34
Kingsway (KWY) United States $0.279B 0.00
Kingstone (KINS) United States $0.277B 7.64
First Acceptance (FACO) United States $0.228B 6.24
Roadzen (RDZN) United States $0.105B 0.00