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 — 2018

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2018-12-31$857.69$1,060.3810,800
2018-12-28$854.13$1,055.9810,600
2018-12-27$856.67$1,059.1217,600
2018-12-26$845.35$1,045.1223,000
2018-12-24$834.13$1,031.2511,500
2018-12-21$846.52$1,046.5720,900
2018-12-20$842.86$1,042.0515,900
2018-12-19$855.00$1,057.0518,700
2018-12-18$867.54$1,072.5618,100
2018-12-17$881.81$1,090.2017,700
2018-12-14$894.73$1,106.1715,800
2018-12-13$897.90$1,110.0910,300
2018-12-12$911.89$1,127.3911,200
2018-12-11$916.00$1,132.4714,800
2018-12-10$922.74$1,140.8031,700
2018-12-07$924.38$1,142.8322,600
2018-12-06$924.00$1,142.3624,100
2018-12-04$929.91$1,149.6715,400
2018-12-03$931.39$1,151.5014,000
2018-11-30$928.75$1,148.2312,100
2018-11-29$917.75$1,134.635,100
2018-11-28$913.72$1,129.658,000
2018-11-27$905.00$1,118.878,500
2018-11-26$904.62$1,118.4011,700
2018-11-23$900.00$1,112.693,900
2018-11-21$909.58$1,124.5311,100
2018-11-20$912.47$1,128.1112,900
2018-11-19$906.57$1,120.8118,600
2018-11-16$898.48$1,110.816,400
2018-11-15$897.57$1,109.6811,900
2018-11-14$885.29$1,094.5014,300
2018-11-13$883.03$1,091.717,100
2018-11-12$878.79$1,086.479,600
2018-11-09$883.54$1,092.3410,200
2018-11-08$897.26$1,109.309,400
2018-11-07$887.17$1,096.8318,700
2018-11-06$885.10$1,094.2715,500
2018-11-05$882.07$1,090.529,700
2018-11-02$876.12$1,083.1712,400
2018-11-01$877.19$1,084.4927,600
2018-10-31$886.67$1,096.2112,900
2018-10-30$878.62$1,086.267,500
2018-10-29$876.39$1,083.5016,100
2018-10-26$874.78$1,081.515,700
2018-10-25$875.80$1,082.7712,000
2018-10-24$869.81$1,075.368,400
2018-10-23$877.50$1,084.8711,900
2018-10-22$883.95$1,092.8516,500
2018-10-19$883.25$1,091.9813,400
2018-10-18$874.95$1,081.7210,100
2018-10-17$881.52$1,089.8416,600
2018-10-16$873.43$1,079.8414,800
2018-10-15$864.17$1,068.3912,000
2018-10-12$869.60$1,075.1019,200
2018-10-11$882.57$1,091.149,600
2018-10-10$902.33$1,115.578,500
2018-10-09$916.00$1,132.476,100
2018-10-08$919.98$1,137.394,300
2018-10-05$919.55$1,136.862,500
2018-10-04$923.00$1,141.123,900
2018-10-03$928.75$1,148.2315,800
2018-10-02$930.61$1,150.5314,200
2018-10-01$933.13$1,153.6514,100
2018-09-28$935.87$1,157.0420,500
2018-09-27$927.15$1,146.2517,800
2018-09-26$932.31$1,152.639,400
2018-09-25$942.16$1,164.8110,000
2018-09-24$951.91$1,176.8715,100
2018-09-21$948.09$1,172.1434,600
2018-09-20$962.74$1,190.2618,500
2018-09-19$956.79$1,182.9029,300
2018-09-18$958.37$1,184.8521,000
2018-09-17$960.08$1,186.9725,900
2018-09-14$979.01$1,210.3716,400
2018-09-13$941.12$1,163.5313,700
2018-09-12$932.94$1,153.4112,500
2018-09-11$934.91$1,155.8511,400
2018-09-10$930.67$1,150.617,700
2018-09-07$928.41$1,147.815,300
2018-09-06$922.79$1,140.864,500
2018-09-05$917.52$1,134.357,600
2018-09-04$922.17$1,140.109,200
2018-08-31$927.95$1,147.2412,400
2018-08-30$924.18$1,142.588,900
2018-08-29$918.51$1,135.579,100
2018-08-28$920.11$1,137.5511,000
2018-08-27$921.15$1,138.846,900
2018-08-24$929.87$1,149.627,500
2018-08-23$924.22$1,142.6313,800
2018-08-22$926.12$1,144.9810,200
2018-08-21$930.57$1,150.4814,500
2018-08-20$931.60$1,151.7616,900
2018-08-17$929.94$1,149.7039,600
2018-08-16$940.88$1,163.239,200
2018-08-15$935.85$1,157.0119,400
2018-08-14$938.25$1,159.9814,900
2018-08-13$939.34$1,161.3315,800
2018-08-10$940.93$1,163.2915,700
2018-08-09$941.20$1,163.638,100
2018-08-08$937.15$1,158.6224,700
2018-08-07$937.83$1,159.4610,800
2018-08-06$934.57$1,155.4326,300
2018-08-03$936.90$1,158.3110,600
2018-08-02$929.62$1,149.3119,900
2018-08-01$922.98$1,141.1013,700
2018-07-31$913.03$1,128.8011,300
2018-07-30$906.06$1,120.189,300
2018-07-27$907.57$1,122.054,200
2018-07-26$911.24$1,126.5910,900
2018-07-25$910.01$1,125.0612,000
2018-07-24$908.02$1,122.6013,000
2018-07-23$909.21$1,124.0810,600
2018-07-20$910.67$1,125.888,800
2018-07-19$907.47$1,121.9210,600
2018-07-18$909.58$1,124.5312,200
2018-07-17$908.81$1,123.5810,600
2018-07-16$910.05$1,125.119,600
2018-07-13$910.37$1,125.518,800
2018-07-12$912.00$1,127.5210,400
2018-07-11$910.30$1,125.4225,300
2018-07-10$911.23$1,126.5710,900
2018-07-09$911.55$1,126.9720,800
2018-07-06$909.63$1,124.5910,100
2018-07-05$905.21$1,119.1312,800
2018-07-03$902.72$1,116.055,000
2018-07-02$905.35$1,119.3014,300
2018-06-29$906.61$1,120.8639,500
2018-06-28$900.98$1,113.9027,100
2018-06-27$896.25$1,108.0520,300
2018-06-26$911.48$1,126.8819,200
2018-06-25$908.41$1,123.0921,000
2018-06-22$915.22$1,131.5160,800
2018-06-21$901.11$1,114.0649,700
2018-06-20$918.00$1,134.9421,300
2018-06-19$925.57$1,144.3044,500
2018-06-18$916.48$1,133.0644,900
2018-06-15$908.12$1,122.7329,900
2018-06-14$910.00$1,125.0531,300
2018-06-13$909.11$1,123.9545,300
2018-06-12$906.00$1,120.1153,900
2018-06-11$903.20$1,116.6442,500
2018-06-08$913.93$1,129.9122,700
2018-06-07$909.90$1,124.9319,400
2018-06-06$908.68$1,123.4217,500
2018-06-05$902.33$1,115.5727,000
2018-06-04$902.29$1,115.5227,500
2018-06-01$904.40$1,118.1317,200
2018-05-31$902.08$1,115.2623,700
2018-05-30$908.87$1,123.6534,100
2018-05-29$904.74$1,118.5536,200
2018-05-25$906.98$1,121.3229,200
2018-05-24$904.10$1,117.7631,600
2018-05-23$896.45$1,108.3032,500
2018-05-22$894.99$1,106.4925,900
2018-05-21$890.78$1,101.2940,100
2018-05-18$881.50$1,089.8254,600
2018-05-17$882.36$1,090.8852,100
2018-05-16$884.82$1,093.9262,000
2018-05-15$892.35$1,103.2343,600
2018-05-14$892.75$1,103.7356,300
2018-05-11$885.00$1,094.1430,200
2018-05-10$877.50$1,084.8729,300
2018-05-09$876.00$1,083.0238,000
2018-05-08$874.00$1,080.5484,200
2018-05-07$864.00$1,068.18122,900
2018-05-04$860.15$1,063.42116,500
2018-05-03$867.50$1,072.5167,900
2018-05-02$867.00$1,071.89100,300
2018-05-01$867.53$1,072.5565,500
2018-04-30$865.29$1,069.7840,600
2018-04-27$867.17$1,072.1045,800
2018-04-26$866.40$1,071.1528,600
2018-04-25$867.14$1,072.0644,800
2018-04-24$863.02$1,066.9740,800
2018-04-23$863.94$1,068.1129,500
2018-04-20$861.29$1,064.8356,300
2018-04-19$860.73$1,064.1458,000
2018-04-18$864.11$1,068.3257,800
2018-04-17$861.20$1,064.7256,400
2018-04-16$857.00$1,059.5350,300
2018-04-13$856.00$1,058.2954,200
2018-04-12$858.90$1,061.8844,900
2018-04-11$859.31$1,062.3887,900
2018-04-10$857.88$1,060.6194,900
2018-04-09$806.17$996.6837,200
2018-04-06$810.98$1,002.6330,700
2018-04-05$817.69$1,010.9326,200
2018-04-04$818.84$1,012.3532,700
2018-04-03$816.15$1,009.0231,800
2018-04-02$817.65$1,010.8841,200
2018-03-29$822.52$1,016.9029,200
2018-03-28$820.30$1,014.1528,300
2018-03-27$815.00$1,007.6043,100
2018-03-26$817.06$1,010.1539,100
2018-03-23$802.33$991.9424,600
2018-03-22$808.90$1,000.0640,100
2018-03-21$813.78$1,006.0931,500
2018-03-20$810.58$1,002.1425,200
2018-03-19$810.17$1,001.6355,200
2018-03-16$816.07$1,008.9251,800
2018-03-15$814.12$1,005.2843,000
2018-03-14$815.23$1,006.6513,400
2018-03-13$829.23$1,023.9326,100
2018-03-12$831.18$1,026.3416,900
2018-03-09$834.69$1,030.6814,700
2018-03-08$828.30$1,022.7914,900
2018-03-07$834.50$1,030.4428,500
2018-03-06$822.93$1,016.1616,000
2018-03-05$822.82$1,016.0220,100
2018-03-02$811.30$1,001.8031,500
2018-03-01$810.32$1,000.5825,100
2018-02-28$806.85$996.3015,400
2018-02-27$803.80$992.5338,300
2018-02-26$809.70$999.8215,400
2018-02-23$809.52$999.6025,900
2018-02-22$806.20$995.5015,700
2018-02-21$810.11$1,000.3315,400
2018-02-20$811.30$1,001.8014,000
2018-02-16$822.00$1,015.0116,100
2018-02-15$811.12$1,001.5723,200
2018-02-14$813.44$1,004.4419,100
2018-02-13$804.58$993.5061,300
2018-02-12$814.73$1,006.0346,900
2018-02-09$803.01$991.5633,300
2018-02-08$789.05$974.3220,800
2018-02-07$809.20$999.2032,200
2018-02-06$813.74$1,004.8132,700
2018-02-05$811.06$1,001.5015,800
2018-02-02$836.69$1,033.1512,600
2018-02-01$840.36$1,037.6810,100
2018-01-31$839.90$1,037.1118,000
2018-01-30$843.88$1,042.0222,300
2018-01-29$846.62$1,045.4121,400
2018-01-26$848.00$1,047.1116,800
2018-01-25$851.06$1,050.8914,700
2018-01-24$849.72$1,049.2410,500
2018-01-23$848.59$1,047.849,800
2018-01-22$847.24$1,046.1716,500
2018-01-19$841.27$1,038.809,100
2018-01-18$843.35$1,041.3721,100
2018-01-17$845.91$1,044.5313,400
2018-01-16$833.47$1,029.1722,300
2018-01-12$834.50$1,030.4415,300
2018-01-11$838.26$1,035.0916,600
2018-01-10$840.62$1,038.0025,300
2018-01-09$841.00$1,038.4722,300
2018-01-08$844.45$1,042.7316,800
2018-01-05$853.12$1,053.438,400
2018-01-04$852.61$1,052.8011,300
2018-01-03$845.00$1,043.4122,000
2018-01-02$848.05$1,047.1719,700