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.

View year

Historical Stock Price — 2015

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2015-12-31$726.81$895.3618,200
2015-12-30$729.59$898.7815,500
2015-12-29$737.26$908.239,100
2015-12-28$740.36$912.057,100
2015-12-24$736.05$906.743,000
2015-12-23$728.25$897.133,100
2015-12-22$727.34$896.0116,900
2015-12-21$733.53$903.6323,300
2015-12-18$744.68$917.3744,300
2015-12-17$770.46$949.1314,200
2015-12-16$772.05$951.0917,900
2015-12-15$766.23$943.9220,300
2015-12-14$763.68$940.7817,200
2015-12-11$762.23$938.9912,600
2015-12-10$762.80$939.6923,000
2015-12-09$768.24$946.3918,400
2015-12-08$777.16$957.3814,600
2015-12-07$782.00$963.3414,700
2015-12-04$798.00$983.069,200
2015-12-03$796.00$980.599,700
2015-12-02$799.11$984.429,100
2015-12-01$799.91$985.4116,600
2015-11-30$808.00$995.3757,700
2015-11-27$779.76$960.592,200
2015-11-25$779.64$960.4415,000
2015-11-24$788.90$971.856,300
2015-11-23$784.00$965.8113,000
2015-11-20$773.10$952.3817,500
2015-11-19$777.02$957.2111,800
2015-11-18$774.98$954.7017,300
2015-11-17$764.68$942.0125,200
2015-11-16$772.31$951.4135,000
2015-11-13$751.00$925.1619,000
2015-11-12$750.05$923.9914,600
2015-11-11$753.35$928.055,700
2015-11-10$764.39$941.6515,800
2015-11-09$754.10$928.9821,600
2015-11-06$757.65$933.3514,100
2015-11-05$750.85$924.977,500
2015-11-04$752.99$927.6117,500
2015-11-03$760.25$936.5517,000
2015-11-02$790.00$973.2024,300
2015-10-30$790.00$973.208,800
2015-10-29$785.94$968.2011,000
2015-10-28$787.75$970.439,000
2015-10-27$776.00$955.955,600
2015-10-26$781.87$963.1810,400
2015-10-23$792.75$976.5930,400
2015-10-22$790.00$973.2017,800
2015-10-21$796.23$980.8724,800
2015-10-20$778.35$958.8533,400
2015-10-19$764.00$941.1736,000
2015-10-16$757.52$933.1913,800
2015-10-15$764.71$942.056,600
2015-10-14$756.77$932.2617,400
2015-10-13$767.44$945.4118,300
2015-10-12$768.05$946.1627,200
2015-10-09$760.00$936.2430,700
2015-10-08$755.17$930.2922,100
2015-10-07$753.12$927.7727,700
2015-10-06$743.55$915.9833,900
2015-10-05$749.80$923.6830,500
2015-10-02$742.99$915.2923,600
2015-10-01$742.29$914.4329,200
2015-09-30$747.30$920.6058,600
2015-09-29$750.00$923.9222,100
2015-09-28$746.00$919.0032,900
2015-09-25$758.00$933.7819,700
2015-09-24$754.17$929.0624,000
2015-09-23$759.98$936.2215,500
2015-09-22$760.00$936.2424,900
2015-09-21$763.00$939.9418,800
2015-09-18$759.26$935.3336,100
2015-09-17$750.05$923.9912,100
2015-09-16$761.50$938.097,200
2015-09-15$764.20$941.4228,200
2015-09-14$765.72$943.2912,100
2015-09-11$768.81$947.1043,800
2015-09-10$771.97$950.9928,500
2015-09-09$753.94$928.7810,000
2015-09-08$749.45$923.2520,300
2015-09-04$744.10$916.669,000
2015-09-03$749.25$923.0011,400
2015-09-02$742.00$914.0730,600
2015-09-01$717.20$883.5221,400
2015-08-31$719.31$886.1223,900
2015-08-28$722.63$890.2116,700
2015-08-27$706.90$870.8342,500
2015-08-26$699.00$861.1029,500
2015-08-25$708.55$872.8620,400
2015-08-24$696.00$857.4026,400
2015-08-21$726.21$894.6222,300
2015-08-20$731.55$901.2018,000
2015-08-19$738.70$910.0089,500
2015-08-18$734.86$905.2727,800
2015-08-17$735.90$906.5512,500
2015-08-14$730.15$899.475,200
2015-08-13$739.00$910.373,100
2015-08-12$733.28$903.3314,700
2015-08-11$730.05$899.3518,400
2015-08-10$723.50$891.2833,700
2015-08-07$732.00$901.7527,500
2015-08-06$725.00$893.1315,900
2015-08-05$716.55$882.729,600
2015-08-04$719.99$886.953,100
2015-08-03$715.29$881.167,600
2015-07-31$706.00$869.7210,700
2015-07-30$701.50$864.188,500
2015-07-29$700.41$862.8326,600
2015-07-28$699.00$861.1019,500
2015-07-27$698.97$861.0653,400
2015-07-24$675.27$831.866,400
2015-07-23$670.77$826.326,900
2015-07-22$672.90$828.9412,500
2015-07-21$675.82$832.548,400
2015-07-20$677.02$834.0210,100
2015-07-17$680.60$838.437,300
2015-07-16$683.60$842.136,000
2015-07-15$683.85$842.438,200
2015-07-14$682.09$840.278,500
2015-07-13$680.79$838.665,500
2015-07-10$679.22$836.736,000
2015-07-09$678.40$835.7211,300
2015-07-08$680.00$837.6913,000
2015-07-07$683.83$842.4112,700
2015-07-06$676.23$833.059,700
2015-07-02$670.65$826.178,200
2015-07-01$671.70$827.4731,400
2015-06-30$654.94$806.8220,700
2015-06-29$655.17$807.1021,800
2015-06-26$669.98$825.3520,400
2015-06-25$667.47$822.268,600
2015-06-24$674.39$830.788,300
2015-06-23$679.65$837.268,300
2015-06-22$671.31$826.995,200
2015-06-19$665.57$819.9121,900
2015-06-18$673.35$829.509,500
2015-06-17$666.00$820.446,800
2015-06-16$662.00$815.5210,200
2015-06-15$654.11$805.8010,700
2015-06-12$646.74$796.729,100
2015-06-11$645.40$795.076,200
2015-06-10$641.95$790.826,900
2015-06-09$638.31$786.338,300
2015-06-08$636.06$783.564,400
2015-06-05$641.20$789.897,900
2015-06-04$640.43$788.959,500
2015-06-03$642.15$791.0610,200
2015-06-02$648.64$799.0611,900
2015-06-01$652.32$803.599,300
2015-05-29$649.24$799.809,500
2015-05-28$650.03$800.774,800
2015-05-27$650.14$800.9111,000
2015-05-26$642.00$790.884,900
2015-05-22$650.20$800.985,400
2015-05-21$642.57$791.585,600
2015-05-20$650.00$800.735,800
2015-05-19$652.00$803.209,800
2015-05-18$657.00$809.364,400
2015-05-15$659.99$813.043,700
2015-05-14$659.85$812.877,700
2015-05-13$649.00$799.504,500
2015-05-12$650.00$800.739,000
2015-05-11$653.45$804.985,200
2015-05-08$658.00$810.5911,000
2015-05-07$656.87$809.2018,800
2015-05-06$666.30$820.814,800
2015-05-05$674.42$830.8211,200
2015-05-04$675.95$832.704,900
2015-05-01$675.00$831.5311,800
2015-04-30$675.97$832.738,500
2015-04-29$669.65$824.944,000
2015-04-28$672.00$827.845,100
2015-04-27$672.71$828.714,700
2015-04-24$675.26$831.856,600
2015-04-23$671.11$826.744,600
2015-04-22$671.87$827.688,400
2015-04-21$674.18$830.522,400
2015-04-20$677.89$835.093,800
2015-04-17$671.12$826.753,400
2015-04-16$683.95$842.561,900
2015-04-15$681.39$839.4011,100
2015-04-14$677.91$835.1211,700
2015-04-13$678.96$836.419,700
2015-04-10$681.01$838.945,800
2015-04-09$687.05$846.384,400
2015-04-08$690.75$850.9320,900
2015-04-07$680.00$837.697,700
2015-04-06$686.65$845.884,200
2015-04-02$678.38$835.7019,100
2015-04-01$681.99$840.1413,400
2015-03-31$684.52$843.266,700
2015-03-30$681.90$840.037,800
2015-03-27$684.00$842.624,900
2015-03-26$684.10$842.7418,300
2015-03-25$681.09$839.033,800
2015-03-24$687.00$846.3112,900
2015-03-23$682.14$840.335,600
2015-03-20$680.76$838.6310,600
2015-03-19$681.61$839.672,900
2015-03-18$689.85$849.836,000
2015-03-17$686.59$845.815,100
2015-03-16$684.96$843.804,700
2015-03-13$672.52$828.487,100
2015-03-12$670.23$825.668,900
2015-03-11$660.57$812.5212,200
2015-03-10$666.00$819.2011,200
2015-03-09$667.38$820.908,400
2015-03-06$666.00$819.206,800
2015-03-05$665.50$818.593,500
2015-03-04$665.50$818.594,400
2015-03-03$668.00$821.664,100
2015-03-02$669.99$824.1110,000
2015-02-27$667.15$820.626,800
2015-02-26$675.00$830.274,000
2015-02-25$664.89$817.845,800
2015-02-24$667.75$821.365,900
2015-02-23$660.00$811.828,200
2015-02-20$679.35$835.624,800
2015-02-19$678.50$834.583,600
2015-02-18$686.50$844.427,700
2015-02-17$680.79$837.3912,800
2015-02-13$657.51$808.769,900
2015-02-12$648.47$797.648,300
2015-02-11$643.84$791.955,300
2015-02-10$650.64$800.314,000
2015-02-09$651.95$801.925,000
2015-02-06$670.00$824.126,500
2015-02-05$660.00$811.826,800
2015-02-04$646.00$794.604,300
2015-02-03$644.15$792.337,300
2015-02-02$636.27$782.637,200
2015-01-30$644.58$792.865,000
2015-01-29$645.00$793.378,500
2015-01-28$641.00$788.453,800
2015-01-27$654.43$804.972,800
2015-01-26$655.50$806.297,800
2015-01-23$640.00$787.224,200
2015-01-22$658.75$810.297,900
2015-01-21$642.10$789.806,100
2015-01-20$642.00$789.686,900
2015-01-16$641.82$789.465,100
2015-01-15$643.37$791.374,600
2015-01-14$644.07$792.235,100
2015-01-13$645.48$793.967,800
2015-01-12$633.00$778.615,100
2015-01-09$629.63$774.476,900
2015-01-08$632.99$778.606,500
2015-01-07$626.16$770.206,300
2015-01-06$622.91$766.2044,200
2015-01-05$618.00$760.1613,900
2015-01-02$632.00$777.386,800