NYSE:WTM | Historical Stock Price | WHITE MOUNTAINS INSURANCE GROUP LTD

Complete retained daily price history on its own workbook tab. Split-adjusted close keeps every historical share price on one comparable split basis. Cumulative dividend-reinvested close is the daily close of a rebased total-return index: it starts with one share at the earliest retained close, reinvests every distribution, and normalizes every forward and reverse split exactly once. Admitted exchange opening prices remain a distinct current-session series.

Available history
1985-10-23 to 2026-09-04
Data captured

Stock Price Chart

Blue: Split-adjusted close · Orange: Cumulative dividend-reinvested close

$22.92$60.30$158.65$417.40$1,098.17$2,889.271985-10-232026-08-27

Logarithmic scale. Both lines share the same starting value for the selected range.

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Historical Stock Price — 2021

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2021-12-31$1,013.90$1,257.479,500
2021-12-30$1,012.34$1,255.5412,000
2021-12-29$1,013.13$1,256.5213,500
2021-12-28$1,014.90$1,258.7115,800
2021-12-27$1,011.10$1,254.009,400
2021-12-23$1,012.36$1,255.5611,600
2021-12-22$1,018.91$1,263.6810,300
2021-12-21$1,013.00$1,256.3520,000
2021-12-20$1,000.85$1,241.2919,100
2021-12-17$1,014.04$1,257.6444,100
2021-12-16$1,012.83$1,256.1421,300
2021-12-15$1,012.31$1,255.5014,400
2021-12-14$1,011.89$1,254.9822,400
2021-12-13$1,002.74$1,243.6325,000
2021-12-10$1,010.25$1,252.9422,700
2021-12-09$992.00$1,230.3117,600
2021-12-08$1,014.90$1,258.719,900
2021-12-07$1,007.34$1,249.3322,300
2021-12-06$1,007.63$1,249.6919,100
2021-12-03$986.90$1,223.9819,900
2021-12-02$998.00$1,237.7517,000
2021-12-01$989.76$1,227.5324,900
2021-11-30$1,002.90$1,243.8318,700
2021-11-29$1,031.10$1,278.8022,000
2021-11-26$1,038.00$1,287.3612,800
2021-11-24$1,057.54$1,311.597,800
2021-11-23$1,056.10$1,309.8113,600
2021-11-22$1,045.84$1,297.089,100
2021-11-19$1,054.90$1,308.3210,400
2021-11-18$1,053.58$1,306.6815,600
2021-11-17$1,067.14$1,323.509,500
2021-11-16$1,089.99$1,351.8414,100
2021-11-15$1,094.69$1,357.677,500
2021-11-12$1,113.10$1,380.506,900
2021-11-11$1,127.10$1,397.868,300
2021-11-10$1,122.57$1,392.257,000
2021-11-09$1,110.02$1,376.6812,600
2021-11-08$1,108.63$1,374.9612,700
2021-11-05$1,083.35$1,343.606,800
2021-11-04$1,064.54$1,320.288,200
2021-11-03$1,077.09$1,335.846,500
2021-11-02$1,100.00$1,364.2513,200
2021-11-01$1,099.94$1,364.1821,200
2021-10-29$1,054.99$1,308.4316,600
2021-10-28$1,079.51$1,338.844,900
2021-10-27$1,066.43$1,322.627,100
2021-10-26$1,100.39$1,364.745,900
2021-10-25$1,109.99$1,376.644,400
2021-10-22$1,101.65$1,366.309,700
2021-10-21$1,091.89$1,354.209,700
2021-10-20$1,086.65$1,347.7012,100
2021-10-19$1,087.50$1,348.755,800
2021-10-18$1,097.97$1,361.749,100
2021-10-15$1,101.46$1,366.068,200
2021-10-14$1,110.93$1,377.817,000
2021-10-13$1,089.69$1,351.4710,100
2021-10-12$1,087.99$1,349.366,200
2021-10-11$1,088.64$1,350.175,500
2021-10-08$1,099.99$1,364.246,500
2021-10-07$1,093.97$1,356.7815,800
2021-10-06$1,090.11$1,351.9919,300
2021-10-05$1,070.28$1,327.3947,500
2021-10-04$1,059.99$1,314.6324,700
2021-10-01$1,069.01$1,325.829,800
2021-09-30$1,069.61$1,326.5612,900
2021-09-29$1,086.94$1,348.0617,800
2021-09-28$1,081.77$1,341.6416,600
2021-09-27$1,099.99$1,364.2418,200
2021-09-24$1,096.38$1,359.7616,100
2021-09-23$1,080.51$1,340.088,900
2021-09-22$1,065.71$1,321.7317,700
2021-09-21$1,059.17$1,313.6216,800
2021-09-20$1,068.60$1,325.3124,700
2021-09-17$1,072.14$1,329.7034,000
2021-09-16$1,068.12$1,324.7217,200
2021-09-15$1,076.39$1,334.9717,400
2021-09-14$1,072.25$1,329.8411,700
2021-09-13$1,090.53$1,352.5112,100
2021-09-10$1,089.84$1,351.6520,700
2021-09-09$1,100.40$1,364.7523,800
2021-09-08$1,106.13$1,371.8628,200
2021-09-07$1,110.00$1,376.6615,100
2021-09-03$1,124.10$1,394.1412,600
2021-09-02$1,126.15$1,396.6923,300
2021-09-01$1,122.00$1,391.5410,900
2021-08-31$1,120.81$1,390.0619,600
2021-08-30$1,120.70$1,389.9317,500
2021-08-27$1,125.23$1,395.5419,900
2021-08-26$1,123.19$1,393.0218,800
2021-08-25$1,128.10$1,399.107,400
2021-08-24$1,129.00$1,400.2211,700
2021-08-23$1,130.26$1,401.7813,000
2021-08-20$1,126.02$1,396.529,500
2021-08-19$1,125.39$1,395.7410,500
2021-08-18$1,124.53$1,394.6812,700
2021-08-17$1,113.30$1,380.7511,900
2021-08-16$1,127.04$1,397.7916,900
2021-08-13$1,123.99$1,394.017,500
2021-08-12$1,132.71$1,404.8218,100
2021-08-11$1,138.59$1,412.1113,500
2021-08-10$1,133.92$1,406.324,600
2021-08-09$1,144.44$1,419.376,500
2021-08-06$1,135.00$1,407.6623,900
2021-08-05$1,125.79$1,396.2412,000
2021-08-04$1,117.70$1,386.2110,800
2021-08-03$1,116.80$1,385.0917,000
2021-08-02$1,122.05$1,391.6014,300
2021-07-30$1,131.57$1,403.416,700
2021-07-29$1,142.00$1,416.3412,200
2021-07-28$1,130.67$1,402.2915,100
2021-07-27$1,127.19$1,397.9815,600
2021-07-26$1,126.78$1,397.4713,700
2021-07-23$1,127.90$1,398.868,400
2021-07-22$1,127.55$1,398.4215,700
2021-07-21$1,134.49$1,407.037,300
2021-07-20$1,128.83$1,400.0120,000
2021-07-19$1,114.56$1,382.3130,300
2021-07-16$1,125.85$1,396.3110,700
2021-07-15$1,117.39$1,385.8211,400
2021-07-14$1,116.50$1,384.728,600
2021-07-13$1,119.00$1,387.8213,300
2021-07-12$1,127.29$1,398.1010,900
2021-07-09$1,133.27$1,405.5214,800
2021-07-08$1,132.44$1,404.4911,800
2021-07-07$1,174.26$1,456.3513,000
2021-07-06$1,161.67$1,440.7421,100
2021-07-02$1,166.89$1,447.2116,000
2021-07-01$1,158.37$1,436.659,000
2021-06-30$1,148.03$1,423.8210,500
2021-06-29$1,147.93$1,423.7013,700
2021-06-28$1,153.11$1,430.1215,300
2021-06-25$1,159.12$1,437.5825,200
2021-06-24$1,128.02$1,399.017,500
2021-06-23$1,118.22$1,386.859,400
2021-06-22$1,125.23$1,395.5412,600
2021-06-21$1,130.00$1,401.4613,100
2021-06-18$1,115.01$1,382.8739,500
2021-06-17$1,122.26$1,391.8614,900
2021-06-16$1,140.64$1,414.6633,700
2021-06-15$1,142.57$1,417.0519,400
2021-06-14$1,132.10$1,404.0716,000
2021-06-11$1,135.43$1,408.2022,000
2021-06-10$1,131.40$1,403.2019,500
2021-06-09$1,130.01$1,401.4714,800
2021-06-08$1,136.00$1,408.9019,400
2021-06-07$1,126.37$1,396.9622,100
2021-06-04$1,144.02$1,418.8516,300
2021-06-03$1,151.60$1,428.2525,700
2021-06-02$1,186.48$1,471.5119,000
2021-06-01$1,188.82$1,474.4121,400
2021-05-28$1,193.36$1,480.0414,400
2021-05-27$1,184.23$1,468.7220,400
2021-05-26$1,194.67$1,481.6724,100
2021-05-25$1,184.67$1,469.2613,800
2021-05-24$1,209.98$1,500.6514,900
2021-05-21$1,213.94$1,505.5715,800
2021-05-20$1,205.16$1,494.6827,300
2021-05-19$1,200.00$1,488.2817,300
2021-05-18$1,196.36$1,483.7633,300
2021-05-17$1,189.17$1,474.8518,500
2021-05-14$1,187.31$1,472.5445,400
2021-05-13$1,185.00$1,469.6730,400
2021-05-12$1,188.03$1,473.4325,000
2021-05-11$1,197.53$1,485.2128,800
2021-05-10$1,223.90$1,517.9230,100
2021-05-07$1,237.15$1,534.3525,500
2021-05-06$1,213.97$1,505.6014,700
2021-05-05$1,203.40$1,492.4916,500
2021-05-04$1,197.64$1,485.3525,600
2021-05-03$1,195.42$1,482.6011,700
2021-04-30$1,165.43$1,445.4010,300
2021-04-29$1,176.41$1,459.0211,500
2021-04-28$1,177.05$1,459.8113,000
2021-04-27$1,200.93$1,489.4312,500
2021-04-26$1,207.95$1,498.1413,100
2021-04-23$1,222.87$1,516.6426,200
2021-04-22$1,199.75$1,487.9719,000
2021-04-21$1,202.03$1,490.7920,800
2021-04-20$1,188.08$1,473.4926,800
2021-04-19$1,175.89$1,458.3834,300
2021-04-16$1,164.11$1,443.7712,700
2021-04-15$1,163.33$1,442.8017,200
2021-04-14$1,145.84$1,421.1110,000
2021-04-13$1,130.53$1,402.128,200
2021-04-12$1,134.30$1,406.7912,100
2021-04-09$1,155.65$1,433.2710,700
2021-04-08$1,153.29$1,430.3552,400
2021-04-07$1,110.64$1,377.4535,400
2021-04-06$1,120.02$1,389.0844,700
2021-04-05$1,135.33$1,408.0735,800
2021-04-01$1,127.30$1,398.1111,900
2021-03-31$1,114.90$1,382.7326,300
2021-03-30$1,116.30$1,384.4725,500
2021-03-29$1,139.01$1,412.6423,900
2021-03-26$1,156.06$1,433.7818,100
2021-03-25$1,166.79$1,447.0924,900
2021-03-24$1,172.28$1,453.9033,500
2021-03-23$1,169.98$1,451.0515,200
2021-03-22$1,171.81$1,453.3219,600
2021-03-19$1,177.03$1,459.7936,900
2021-03-18$1,175.51$1,457.9029,700
2021-03-17$1,185.02$1,469.7029,000
2021-03-16$1,178.63$1,461.7733,900
2021-03-15$1,187.73$1,473.0648,200
2021-03-12$1,179.99$1,463.4686,500
2021-03-11$1,181.30$1,463.8461,800
2021-03-10$1,179.77$1,461.9555,400
2021-03-09$1,159.39$1,436.69107,700
2021-03-08$1,165.12$1,443.7977,800
2021-03-05$1,171.23$1,451.37154,200
2021-03-04$1,111.09$1,376.8493,900
2021-03-03$1,164.19$1,442.6490,100
2021-03-02$1,189.99$1,474.61113,500
2021-03-01$1,197.00$1,483.3047,200
2021-02-26$1,195.06$1,480.9090,200
2021-02-25$1,199.71$1,486.6627,000
2021-02-24$1,204.96$1,493.1634,900
2021-02-23$1,205.27$1,493.5524,000
2021-02-22$1,267.52$1,570.6916,000
2021-02-19$1,219.68$1,511.407,200
2021-02-18$1,210.10$1,499.5317,700
2021-02-17$1,180.50$1,462.857,800
2021-02-16$1,147.43$1,421.8719,300
2021-02-12$1,149.63$1,424.6016,200
2021-02-11$1,158.07$1,435.0617,000
2021-02-10$1,163.92$1,442.3121,300
2021-02-09$1,123.60$1,392.3421,300
2021-02-08$1,093.97$1,355.6321,400
2021-02-05$1,082.99$1,342.0212,900
2021-02-04$1,061.61$1,315.5329,900
2021-02-03$1,096.81$1,359.1516,600
2021-02-02$1,072.60$1,329.1512,800
2021-02-01$1,050.22$1,301.4118,100
2021-01-29$1,020.00$1,263.9619,700
2021-01-28$1,042.26$1,291.559,900
2021-01-27$1,025.00$1,270.1626,800
2021-01-26$1,015.01$1,257.7828,700
2021-01-25$1,018.42$1,262.0125,300
2021-01-22$1,040.01$1,288.7613,200
2021-01-21$1,020.00$1,263.9626,800
2021-01-20$1,033.13$1,280.2415,900
2021-01-19$1,022.92$1,267.5813,900
2021-01-15$1,022.02$1,266.4710,200
2021-01-14$1,016.00$1,259.0114,300
2021-01-13$1,010.00$1,251.5720,800
2021-01-12$1,016.43$1,259.5426,500
2021-01-11$1,058.98$1,312.2715,600
2021-01-08$1,062.52$1,316.6513,300
2021-01-07$1,032.16$1,279.0314,800
2021-01-06$1,043.70$1,293.3334,400
2021-01-05$1,018.32$1,261.8816,500
2021-01-04$1,014.59$1,257.269,500