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 — 2020

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2020-12-31$1,000.66$1,240.0011,900——
2020-12-30$998.30$1,237.078,100——
2020-12-29$1,002.39$1,242.148,000——
2020-12-28$1,005.89$1,246.484,900——
2020-12-24$985.81$1,221.608,400——
2020-12-23$1,005.39$1,245.8612,300——
2020-12-22$994.80$1,232.7415,900——
2020-12-21$982.62$1,217.6413,500——
2020-12-18$966.16$1,197.2527,000——
2020-12-17$999.80$1,238.9313,400——
2020-12-16$999.45$1,238.5013,100——
2020-12-15$1,008.33$1,249.5014,900——
2020-12-14$987.49$1,223.6810,700——
2020-12-11$983.43$1,218.657,300——
2020-12-10$992.66$1,230.0911,100——
2020-12-09$990.89$1,227.8910,600——
2020-12-08$981.79$1,216.626,100——
2020-12-07$971.15$1,203.437,600——
2020-12-04$970.54$1,202.6711,200——
2020-12-03$955.02$1,183.445,400——
2020-12-02$966.90$1,198.1614,200——
2020-12-01$966.76$1,197.9914,000——
2020-11-30$960.00$1,189.6126,800——
2020-11-27$962.01$1,192.106,300——
2020-11-25$997.93$1,236.6218,900——
2020-11-24$999.00$1,237.9414,400——
2020-11-23$968.35$1,199.9617,700——
2020-11-20$961.28$1,191.2010,500——
2020-11-19$962.00$1,192.0911,900——
2020-11-18$961.00$1,190.8516,200——
2020-11-17$957.00$1,185.9016,100——
2020-11-16$954.55$1,182.8625,400——
2020-11-13$918.37$1,138.038,300——
2020-11-12$900.07$1,115.359,700——
2020-11-11$911.73$1,129.808,900——
2020-11-10$920.14$1,140.2212,900——
2020-11-09$938.95$1,163.5310,700——
2020-11-06$903.85$1,120.0311,500——
2020-11-05$934.76$1,158.348,600——
2020-11-04$918.73$1,138.4718,400——
2020-11-03$943.90$1,169.6621,000——
2020-11-02$935.88$1,159.7220,900——
2020-10-30$908.33$1,125.598,400——
2020-10-29$917.50$1,136.9515,900——
2020-10-28$903.85$1,120.0330,000——
2020-10-27$944.00$1,169.7916,600——
2020-10-26$952.00$1,179.7018,900——
2020-10-23$952.47$1,180.2821,000——
2020-10-22$968.28$1,199.8718,500——
2020-10-21$954.00$1,182.1822,500——
2020-10-20$906.00$1,122.7010,900——
2020-10-19$898.00$1,112.7818,800——
2020-10-16$898.77$1,113.7415,700——
2020-10-15$883.55$1,094.8815,800——
2020-10-14$882.45$1,093.5214,500——
2020-10-13$881.53$1,092.3824,500——
2020-10-12$918.12$1,137.7225,400——
2020-10-09$875.14$1,084.4610,400——
2020-10-08$862.21$1,068.4310,200——
2020-10-07$858.20$1,063.4724,100——
2020-10-06$842.10$1,043.5125,600——
2020-10-05$804.03$996.3421,700——
2020-10-02$790.26$979.2820,400——
2020-10-01$785.87$973.8429,600——
2020-09-30$779.00$965.3213,500——
2020-09-29$775.02$960.3929,600——
2020-09-28$775.35$960.8026,900——
2020-09-25$757.00$938.0633,100——
2020-09-24$764.76$947.6810,300——
2020-09-23$771.92$956.5512,000——
2020-09-22$788.00$976.4711,000——
2020-09-21$791.43$980.7314,700——
2020-09-18$799.21$990.3724,100——
2020-09-17$809.67$1,003.3317,200——
2020-09-16$815.40$1,010.4326,700——
2020-09-15$822.20$1,018.8513,700——
2020-09-14$840.88$1,042.0030,800——
2020-09-11$833.00$1,032.2413,100——
2020-09-10$853.00$1,057.0215,900——
2020-09-09$857.46$1,062.5510,900——
2020-09-08$863.30$1,069.7912,000——
2020-09-04$885.19$1,096.918,700——
2020-09-03$875.37$1,084.748,600——
2020-09-02$890.25$1,103.188,400——
2020-09-01$893.77$1,107.547,200——
2020-08-31$891.40$1,104.6111,700——
2020-08-28$906.00$1,122.708,500——
2020-08-27$894.00$1,107.839,200——
2020-08-26$876.00$1,085.5212,900——
2020-08-25$893.90$1,107.7016,000——
2020-08-24$876.00$1,085.5214,900——
2020-08-21$877.07$1,086.856,100——
2020-08-20$879.01$1,089.259,000——
2020-08-19$894.53$1,108.486,900——
2020-08-18$899.50$1,114.649,500——
2020-08-17$899.75$1,114.9519,100——
2020-08-14$904.13$1,120.389,100——
2020-08-13$915.03$1,133.896,100——
2020-08-12$915.00$1,133.857,800——
2020-08-11$941.00$1,166.077,800——
2020-08-10$955.48$1,184.0113,800——
2020-08-07$921.50$1,141.9115,700——
2020-08-06$886.97$1,099.126,500——
2020-08-05$886.98$1,099.1315,200——
2020-08-04$882.40$1,093.4510,600——
2020-08-03$889.24$1,101.9311,800——
2020-07-31$880.13$1,090.6410,100——
2020-07-30$860.00$1,065.704,300——
2020-07-29$871.10$1,079.458,200——
2020-07-28$850.00$1,053.306,000——
2020-07-27$849.90$1,053.189,900——
2020-07-24$878.16$1,088.2010,800——
2020-07-23$896.71$1,111.1912,900——
2020-07-22$874.63$1,083.828,500——
2020-07-21$879.97$1,090.4413,300——
2020-07-20$869.08$1,076.958,400——
2020-07-17$869.75$1,077.789,700——
2020-07-16$878.00$1,088.0010,500——
2020-07-15$870.56$1,078.7817,000——
2020-07-14$864.23$1,070.947,300——
2020-07-13$866.49$1,073.748,600——
2020-07-10$866.80$1,074.1213,400——
2020-07-09$842.49$1,044.0016,900——
2020-07-08$869.00$1,076.8523,600——
2020-07-07$879.35$1,089.6715,300——
2020-07-06$907.11$1,124.0753,300——
2020-07-02$897.34$1,111.9729,700——
2020-07-01$889.43$1,102.1614,600——
2020-06-30$887.97$1,100.368,400——
2020-06-29$881.00$1,091.7225,600——
2020-06-26$882.80$1,093.9537,800——
2020-06-25$874.00$1,083.0415,300——
2020-06-24$871.50$1,079.9517,100——
2020-06-23$879.82$1,090.2627,600——
2020-06-22$875.00$1,084.2824,100——
2020-06-19$874.87$1,084.1239,500——
2020-06-18$863.11$1,069.5518,100——
2020-06-17$873.00$1,081.8039,700——
2020-06-16$877.68$1,087.6027,200——
2020-06-15$853.95$1,058.2026,000——
2020-06-12$828.77$1,027.0019,700——
2020-06-11$825.09$1,022.4423,000——
2020-06-10$876.29$1,085.8823,800——
2020-06-09$903.08$1,119.0818,500——
2020-06-08$920.00$1,140.0517,700——
2020-06-05$918.32$1,137.9620,900——
2020-06-04$889.37$1,102.0912,800——
2020-06-03$889.98$1,102.8517,800——
2020-06-02$865.61$1,072.6523,300——
2020-06-01$898.24$1,113.0814,000——
2020-05-29$915.56$1,134.5414,000——
2020-05-28$916.18$1,135.3112,500——
2020-05-27$912.18$1,130.3614,400——
2020-05-26$920.28$1,140.3916,900——
2020-05-22$920.00$1,140.0511,200——
2020-05-21$893.29$1,106.9518,600——
2020-05-20$898.98$1,114.0010,400——
2020-05-19$887.66$1,099.979,400——
2020-05-18$912.32$1,130.5312,500——
2020-05-15$881.17$1,091.9311,800——
2020-05-14$888.88$1,101.4810,700——
2020-05-13$882.50$1,093.5816,500——
2020-05-12$904.90$1,121.3412,900——
2020-05-11$940.00$1,164.839,200——
2020-05-08$907.34$1,124.3618,900——
2020-05-07$909.70$1,127.2815,700——
2020-05-06$893.45$1,107.1511,500——
2020-05-05$935.94$1,159.8012,700——
2020-05-04$968.32$1,199.9220,300——
2020-05-01$960.74$1,190.5312,400——
2020-04-30$973.00$1,205.7222,700——
2020-04-29$972.38$1,204.9516,700——
2020-04-28$951.48$1,179.0617,400——
2020-04-27$951.75$1,179.3913,100——
2020-04-24$887.02$1,099.1815,300——
2020-04-23$887.50$1,099.7728,900——
2020-04-22$876.98$1,086.7420,300——
2020-04-21$867.76$1,075.3123,200——
2020-04-20$885.00$1,096.6813,400——
2020-04-17$885.85$1,097.7324,700——
2020-04-16$890.62$1,103.6422,600——
2020-04-15$885.10$1,096.8025,100——
2020-04-14$879.80$1,090.2328,100——
2020-04-13$904.80$1,121.2117,500——
2020-04-09$943.80$1,169.5418,400——
2020-04-08$925.00$1,146.2426,000——
2020-04-07$937.55$1,161.7931,300——
2020-04-06$938.78$1,163.3223,500——
2020-04-03$930.14$1,152.6126,000——
2020-04-02$953.91$1,182.0722,100——
2020-04-01$893.14$1,106.7626,400——
2020-03-31$910.00$1,127.6519,200——
2020-03-30$907.79$1,124.9228,600——
2020-03-27$905.86$1,122.5236,700——
2020-03-26$949.94$1,177.1531,400——
2020-03-25$840.00$1,040.9141,300——
2020-03-24$824.75$1,022.0139,100——
2020-03-23$706.88$875.9541,900——
2020-03-20$702.92$871.0556,200——
2020-03-19$719.02$891.0029,700——
2020-03-18$696.04$862.5247,300——
2020-03-17$787.01$975.2547,400——
2020-03-16$804.13$996.4639,000——
2020-03-13$836.15$1,036.1431,000——
2020-03-12$818.36$1,012.8631,700——
2020-03-11$912.67$1,129.5824,400——
2020-03-10$956.80$1,184.2021,400——
2020-03-09$958.87$1,186.7614,900——
2020-03-06$1,011.15$1,251.4714,000——
2020-03-05$1,061.23$1,313.4511,100——
2020-03-04$1,054.67$1,305.3314,800——
2020-03-03$1,000.00$1,237.679,400——
2020-03-02$1,006.00$1,245.0920,900——
2020-02-28$990.10$1,225.4124,900——
2020-02-27$1,071.94$1,326.7013,300——
2020-02-26$1,107.05$1,370.168,500——
2020-02-25$1,108.84$1,372.3712,700——
2020-02-24$1,127.41$1,395.369,400——
2020-02-21$1,142.06$1,413.498,700——
2020-02-20$1,145.00$1,417.137,600——
2020-02-19$1,149.20$1,422.336,000——
2020-02-18$1,146.00$1,418.376,300——
2020-02-14$1,148.23$1,421.138,000——
2020-02-13$1,142.03$1,413.4510,200——
2020-02-12$1,143.20$1,414.907,500——
2020-02-11$1,164.52$1,441.298,500——
2020-02-10$1,154.85$1,429.326,600——
2020-02-07$1,148.71$1,421.723,700——
2020-02-06$1,151.58$1,425.2713,100——
2020-02-05$1,163.00$1,439.416,300——
2020-02-04$1,146.01$1,418.3814,000——
2020-02-03$1,130.68$1,399.4111,100——
2020-01-31$1,117.22$1,382.7516,700——
2020-01-30$1,123.61$1,390.658,800——
2020-01-29$1,111.01$1,375.068,300——
2020-01-28$1,107.01$1,370.1112,700——
2020-01-27$1,098.64$1,359.756,600——
2020-01-24$1,104.80$1,367.379,300——
2020-01-23$1,107.64$1,370.8911,600——
2020-01-22$1,114.75$1,379.695,900——
2020-01-21$1,112.46$1,376.857,200——
2020-01-17$1,108.13$1,371.508,900——
2020-01-16$1,104.32$1,366.789,000——
2020-01-15$1,100.13$1,361.5914,500——
2020-01-14$1,099.64$1,360.9911,200——
2020-01-13$1,103.94$1,366.3114,200——
2020-01-10$1,108.01$1,371.356,900——
2020-01-09$1,109.20$1,372.827,400——
2020-01-08$1,115.56$1,380.696,300——
2020-01-07$1,112.12$1,376.437,200——
2020-01-06$1,120.25$1,386.508,100——
2020-01-03$1,120.69$1,387.049,900——
2020-01-02$1,122.90$1,389.7810,800——