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 — 2005

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2005-12-30$558.55$649.526,400
2005-12-29$555.63$646.1211,600
2005-12-28$556.50$647.1310,100
2005-12-27$564.50$656.4412,000
2005-12-23$571.90$665.0415,000
2005-12-22$578.00$672.1418,000
2005-12-21$579.75$674.1737,900
2005-12-20$579.00$673.3015,300
2005-12-19$584.61$679.8211,300
2005-12-16$588.01$683.784,500
2005-12-15$594.50$691.3215,400
2005-12-14$593.75$688.1317,300
2005-12-13$591.00$684.9426,300
2005-12-12$594.40$688.8814,100
2005-12-09$587.97$681.4324,700
2005-12-08$595.75$690.4425,600
2005-12-07$597.50$692.4729,900
2005-12-06$600.00$695.3756,900
2005-12-05$600.00$695.3726,300
2005-12-02$592.02$686.1237,800
2005-12-01$604.25$700.2937,300
2005-11-30$608.40$705.1013,700
2005-11-29$608.50$705.2220,900
2005-11-28$611.01$708.1311,200
2005-11-25$620.00$718.552,100
2005-11-23$615.20$712.9912,000
2005-11-22$615.00$712.7530,600
2005-11-21$616.90$714.9610,900
2005-11-18$616.00$713.9110,400
2005-11-17$619.00$717.394,500
2005-11-16$618.00$716.2315,500
2005-11-15$623.50$722.606,000
2005-11-14$631.00$731.3010,400
2005-11-11$624.93$724.2633,400
2005-11-10$629.75$729.859,100
2005-11-09$620.00$718.5514,800
2005-11-08$617.10$715.196,400
2005-11-07$606.00$702.3228,100
2005-11-04$606.10$702.4422,200
2005-11-03$600.00$695.3725,700
2005-11-02$603.00$698.8552,500
2005-11-01$611.00$708.1223,700
2005-10-31$604.90$701.058,500
2005-10-28$597.00$691.899,000
2005-10-27$591.50$685.5210,000
2005-10-26$587.12$680.4417,200
2005-10-25$568.00$658.2810,800
2005-10-24$577.50$669.2925,800
2005-10-21$580.00$672.1910,700
2005-10-20$576.67$668.331,800
2005-10-19$573.00$664.0813,500
2005-10-18$577.00$668.7118,100
2005-10-17$587.93$681.3822,200
2005-10-14$598.45$693.5712,300
2005-10-13$599.98$695.358,200
2005-10-12$599.00$694.2114,200
2005-10-11$610.00$706.9627,900
2005-10-10$602.00$697.696,500
2005-10-07$600.01$695.3818,200
2005-10-06$601.73$697.3710,700
2005-10-05$603.19$699.0710,100
2005-10-04$615.95$713.856,900
2005-10-03$612.00$709.2827,800
2005-09-30$604.00$700.0039,400
2005-09-29$606.00$702.3222,600
2005-09-28$601.75$697.4020,900
2005-09-27$623.00$722.0315,700
2005-09-26$627.12$726.8016,600
2005-09-23$620.00$718.5529,600
2005-09-22$595.10$689.6932,000
2005-09-21$615.01$712.7723,700
2005-09-20$630.00$730.1427,000
2005-09-19$637.00$738.2521,600
2005-09-16$630.00$730.1478,200
2005-09-15$633.00$733.616,600
2005-09-14$641.50$741.1511,600
2005-09-13$642.20$741.9615,200
2005-09-12$635.25$733.9323,600
2005-09-09$659.00$761.37243,400
2005-09-08$702.50$811.6236,700
2005-09-07$689.53$796.6417,400
2005-09-06$655.00$756.745,400
2005-09-02$653.90$755.4711,200
2005-09-01$656.00$757.905,300
2005-08-31$659.90$762.418,800
2005-08-30$659.75$762.237,400
2005-08-29$676.91$782.063,900
2005-08-26$683.50$789.673,200
2005-08-25$675.42$780.342,500
2005-08-24$687.00$793.722,400
2005-08-23$687.50$794.292,600
2005-08-22$686.00$792.5614,200
2005-08-19$682.59$788.622,500
2005-08-18$675.00$779.858,500
2005-08-17$664.75$768.017,300
2005-08-16$654.51$756.183,200
2005-08-15$651.00$752.128,700
2005-08-12$643.50$743.464,100
2005-08-11$628.75$726.426,000
2005-08-10$631.00$729.027,800
2005-08-09$630.00$727.8610,100
2005-08-08$627.00$724.401,500
2005-08-05$637.30$736.304,800
2005-08-04$637.50$736.533,000
2005-08-03$638.01$737.123,100
2005-08-02$643.00$742.889,700
2005-08-01$638.00$737.104,400
2005-07-29$639.00$738.266,400
2005-07-28$645.00$745.194,400
2005-07-27$643.99$744.026,800
2005-07-26$639.50$738.8416,100
2005-07-25$638.94$738.193,100
2005-07-22$632.50$730.752,500
2005-07-21$635.30$733.984,800
2005-07-20$631.51$729.615,600
2005-07-19$628.49$726.124,600
2005-07-18$631.00$729.0216,200
2005-07-15$625.75$722.9545,300
2005-07-14$623.50$720.3532,300
2005-07-13$625.90$723.1225,800
2005-07-12$631.00$729.026,700
2005-07-11$640.99$740.563,800
2005-07-08$641.00$740.579,700
2005-07-07$633.25$731.622,700
2005-07-06$640.00$739.412,000
2005-07-05$642.50$742.303,700
2005-07-01$638.00$737.107,500
2005-06-30$630.90$728.906,100
2005-06-29$639.00$738.266,300
2005-06-28$650.23$751.232,500
2005-06-27$648.75$749.523,600
2005-06-24$645.00$745.191,500
2005-06-23$646.75$747.215,900
2005-06-22$647.50$748.087,700
2005-06-21$645.75$746.067,600
2005-06-20$656.50$758.483,800
2005-06-17$665.00$768.307,900
2005-06-16$654.50$756.174,100
2005-06-15$661.00$763.686,300
2005-06-14$641.00$740.573,400
2005-06-13$634.98$733.618,800
2005-06-10$645.30$745.543,500
2005-06-09$646.50$746.926,900
2005-06-08$649.00$747.506,600
2005-06-07$654.00$753.264,900
2005-06-06$653.50$752.686,700
2005-06-03$663.50$764.202,400
2005-06-02$662.00$762.485,100
2005-06-01$670.50$772.277,100
2005-05-31$664.50$765.3512,100
2005-05-27$660.00$760.173,600
2005-05-26$659.50$759.604,400
2005-05-25$658.40$758.336,000
2005-05-24$670.00$771.693,900
2005-05-23$671.00$772.844,100
2005-05-20$669.99$771.687,300
2005-05-19$670.00$771.695,100
2005-05-18$667.45$768.755,000
2005-05-17$670.00$771.693,500
2005-05-16$665.00$765.934,000
2005-05-13$654.00$753.267,600
2005-05-12$659.65$759.776,300
2005-05-11$670.00$771.6917,100
2005-05-10$657.00$756.723,500
2005-05-09$659.50$759.605,200
2005-05-06$660.00$760.174,900
2005-05-05$645.00$742.905,900
2005-05-04$654.01$753.279,800
2005-05-03$652.00$750.9628,600
2005-05-02$650.00$748.6523,700
2005-04-29$627.01$722.1718,900
2005-04-28$608.00$700.287,900
2005-04-27$608.75$701.1412,400
2005-04-26$600.00$691.079,000
2005-04-25$595.99$686.451,400
2005-04-22$585.00$673.7911,000
2005-04-21$592.00$681.856,200
2005-04-20$590.00$679.559,800
2005-04-19$591.00$680.708,100
2005-04-18$582.99$671.476,600
2005-04-15$578.97$666.846,400
2005-04-14$576.00$663.429,200
2005-04-13$574.00$661.1219,900
2005-04-12$579.50$667.4516,200
2005-04-11$576.25$663.7125,500
2005-04-08$567.00$653.0670,400
2005-04-07$573.00$659.9726,200
2005-04-06$586.01$674.9521,300
2005-04-05$599.50$690.4917,500
2005-04-04$600.00$691.0717,200
2005-04-01$600.01$691.085,600
2005-03-31$608.50$700.8614,000
2005-03-30$605.00$696.8212,800
2005-03-29$609.00$701.436,700
2005-03-28$611.00$703.735,300
2005-03-24$615.00$708.3414,700
2005-03-23$630.75$726.484,000
2005-03-22$647.00$745.2012,500
2005-03-21$641.00$738.294,600
2005-03-18$649.99$748.646,000
2005-03-17$655.35$754.827,000
2005-03-16$652.25$751.252,500
2005-03-15$664.00$764.789,400
2005-03-14$670.17$771.896,000
2005-03-11$677.99$780.893,800
2005-03-10$667.00$768.236,100
2005-03-09$648.50$744.6211,100
2005-03-08$655.00$752.096,500
2005-03-07$654.00$750.9411,000
2005-03-04$675.00$775.056,700
2005-03-03$672.41$772.085,100
2005-03-02$662.01$760.143,800
2005-03-01$653.00$749.794,200
2005-02-28$653.50$750.367,000
2005-02-25$657.00$754.3811,300
2005-02-24$634.00$727.979,200
2005-02-23$642.00$737.163,600
2005-02-22$658.97$756.643,000
2005-02-18$658.00$755.532,400
2005-02-17$658.75$756.393,400
2005-02-16$664.01$762.434,900
2005-02-15$660.00$757.832,200
2005-02-14$659.45$757.205,700
2005-02-11$646.00$741.752,700
2005-02-10$643.00$738.311,900
2005-02-09$636.80$731.197,300
2005-02-08$656.50$753.8128,700
2005-02-07$669.00$768.1640,300
2005-02-04$637.12$731.565,300
2005-02-03$636.51$730.8617,600
2005-02-02$630.00$723.3832,200
2005-02-01$589.90$677.346,200
2005-01-31$591.00$678.605,900
2005-01-28$588.49$675.723,200
2005-01-27$589.75$677.163,900
2005-01-26$591.40$679.066,500
2005-01-25$590.00$677.455,000
2005-01-24$582.00$668.2710,000
2005-01-21$592.25$680.042,700
2005-01-20$592.50$680.327,500
2005-01-19$599.52$688.386,000
2005-01-18$603.50$692.954,400
2005-01-14$608.00$698.129,600
2005-01-13$607.12$697.1110,200
2005-01-12$608.50$698.6914,200
2005-01-11$603.64$693.119,500
2005-01-10$599.75$688.6528,100
2005-01-07$601.50$690.663,700
2005-01-06$598.50$687.219,500
2005-01-05$600.00$688.9315,200
2005-01-04$614.00$705.0114,500
2005-01-03$631.01$724.5412,100