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 — 2003

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2003-12-31$459.95$527.0420,900
2003-12-30$453.99$520.2114,900
2003-12-29$456.22$522.7610,300
2003-12-26$457.00$523.666,200
2003-12-24$455.50$521.944,700
2003-12-23$454.00$520.227,400
2003-12-22$454.50$520.796,000
2003-12-19$455.00$521.3613,100
2003-12-18$461.00$528.242,200
2003-12-17$455.50$521.941,000
2003-12-16$459.98$527.071,600
2003-12-15$457.00$523.661,900
2003-12-12$460.97$528.207,300
2003-12-11$452.00$517.936,000
2003-12-10$456.00$522.519,000
2003-12-09$451.00$516.787,500
2003-12-08$446.00$511.0510,800
2003-12-05$444.90$509.796,200
2003-12-04$441.51$505.913,000
2003-12-03$445.00$509.913,300
2003-12-02$446.83$512.006,000
2003-12-01$449.10$514.6013,600
2003-11-28$437.00$500.74900
2003-11-26$436.40$500.059,100
2003-11-25$425.00$486.998,400
2003-11-24$423.50$485.279,300
2003-11-21$415.50$476.106,300
2003-11-20$418.00$478.974,100
2003-11-19$420.50$481.832,400
2003-11-18$420.50$481.83500
2003-11-17$423.75$485.566,700
2003-11-14$423.98$485.824,100
2003-11-13$423.00$484.702,800
2003-11-12$424.50$486.426,700
2003-11-11$422.00$483.5524,900
2003-11-10$423.50$485.276,100
2003-11-07$424.75$486.707,500
2003-11-06$424.00$485.8413,500
2003-11-05$424.50$486.425,600
2003-11-04$427.00$489.282,400
2003-11-03$427.50$489.8518,300
2003-10-31$424.00$485.8420,300
2003-10-30$433.00$496.155,000
2003-10-29$430.50$493.2915,600
2003-10-28$428.50$491.0012,600
2003-10-27$425.00$486.996,300
2003-10-24$428.50$491.007,000
2003-10-23$428.00$490.4310,300
2003-10-22$425.50$487.564,000
2003-10-21$435.25$498.7321,400
2003-10-20$422.00$483.5513,000
2003-10-17$415.03$475.5610,100
2003-10-16$426.00$488.1323,000
2003-10-15$421.00$482.407,000
2003-10-14$425.00$486.9916,300
2003-10-13$420.00$481.265,800
2003-10-10$416.50$477.2541,000
2003-10-09$417.25$478.1110,800
2003-10-08$419.70$480.924,600
2003-10-07$419.75$480.9714,100
2003-10-06$424.00$485.8411,600
2003-10-03$422.00$483.5511,200
2003-10-02$413.75$474.1034,600
2003-10-01$413.00$473.2419,100
2003-09-30$397.03$454.9413,700
2003-09-29$403.00$461.7810,200
2003-09-26$409.00$468.6510,100
2003-09-25$409.00$468.6525,300
2003-09-24$411.75$471.8111,400
2003-09-23$411.02$470.975,500
2003-09-22$413.75$474.1027,900
2003-09-19$416.75$477.5333,300
2003-09-18$406.90$466.254,000
2003-09-17$406.00$465.2211,300
2003-09-16$401.00$459.497,900
2003-09-15$393.08$450.4159,300
2003-09-12$397.00$454.906,500
2003-09-11$394.00$451.4710,100
2003-09-10$395.75$453.472,400
2003-09-09$400.99$459.483,600
2003-09-08$403.50$462.354,300
2003-09-05$404.00$462.933,500
2003-09-04$403.00$461.7829,400
2003-09-03$400.00$458.3424,600
2003-09-02$400.00$458.3419,700
2003-08-29$398.16$456.235,900
2003-08-28$395.00$452.617,500
2003-08-27$386.00$442.306,400
2003-08-26$378.99$434.2713,300
2003-08-25$382.00$437.724,200
2003-08-22$390.00$446.882,600
2003-08-21$393.59$451.003,200
2003-08-20$398.50$456.626,200
2003-08-19$401.75$460.354,700
2003-08-18$402.50$461.2197,600
2003-08-15$391.00$448.032,300
2003-08-14$396.50$454.334,800
2003-08-13$399.00$457.205,300
2003-08-12$398.90$457.085,400
2003-08-11$400.25$458.632,500
2003-08-08$402.97$461.748,200
2003-08-07$398.25$456.347,000
2003-08-06$399.50$457.7710,000
2003-08-05$399.65$457.9413,500
2003-08-04$394.21$451.718,400
2003-08-01$392.00$449.1718,700
2003-07-31$379.50$434.857,700
2003-07-30$368.00$421.672,900
2003-07-29$370.00$423.973,600
2003-07-28$373.50$427.985,100
2003-07-25$362.00$414.809,200
2003-07-24$362.00$414.806,700
2003-07-23$364.00$417.095,700
2003-07-22$370.46$424.4913,500
2003-07-21$367.26$420.8313,900
2003-07-18$366.00$419.3853,200
2003-07-17$376.00$430.844,900
2003-07-16$382.00$437.7223,300
2003-07-15$390.00$446.8810,000
2003-07-14$391.75$448.896,500
2003-07-11$392.50$449.758,500
2003-07-10$392.46$449.705,300
2003-07-09$393.70$451.1231,000
2003-07-08$395.79$453.528,600
2003-07-07$398.97$457.166,100
2003-07-03$399.97$458.317,500
2003-07-02$400.25$458.638,900
2003-07-01$398.01$456.062,400
2003-06-30$395.00$452.614,300
2003-06-27$400.00$458.3411,600
2003-06-26$400.00$458.347,400
2003-06-25$400.00$458.342,000
2003-06-24$399.99$458.335,900
2003-06-23$399.25$457.484,700
2003-06-20$402.50$461.216,000
2003-06-19$410.11$469.934,500
2003-06-18$418.49$479.535,700
2003-06-17$417.76$478.6910,500
2003-06-16$420.50$481.8330,500
2003-06-13$416.80$477.5913,500
2003-06-12$417.50$478.3920,800
2003-06-11$413.50$473.8121,400
2003-06-10$406.40$465.6811,500
2003-06-09$400.06$458.418,000
2003-06-06$407.90$467.3924,400
2003-06-05$400.00$458.34105,400
2003-06-04$400.50$458.918,400
2003-06-03$399.80$458.117,600
2003-06-02$405.01$464.0835,300
2003-05-30$411.00$470.956,500
2003-05-29$397.00$454.905,700
2003-05-28$394.50$452.047,100
2003-05-27$395.70$453.416,000
2003-05-23$394.85$452.444,200
2003-05-22$397.50$455.4811,400
2003-05-21$391.75$448.893,000
2003-05-20$388.00$444.595,900
2003-05-19$387.99$444.586,900
2003-05-16$396.00$453.768,900
2003-05-15$396.00$453.769,600
2003-05-14$392.00$449.175,800
2003-05-13$393.00$450.326,300
2003-05-12$392.90$450.216,700
2003-05-09$382.51$438.3010,400
2003-05-08$380.01$435.442,600
2003-05-07$382.00$437.725,700
2003-05-06$383.65$439.617,900
2003-05-05$381.50$437.147,900
2003-05-02$380.08$435.525,400
2003-05-01$381.98$437.697,000
2003-04-30$376.50$431.4113,800
2003-04-29$379.00$434.2813,200
2003-04-28$379.00$434.2810,200
2003-04-25$366.50$419.965,600
2003-04-24$363.00$415.9511,400
2003-04-23$364.75$417.9527,100
2003-04-22$371.50$425.6812,000
2003-04-21$360.10$412.6210,600
2003-04-17$355.80$407.697,100
2003-04-16$353.95$405.585,500
2003-04-15$351.00$402.1910,400
2003-04-14$344.75$395.035,000
2003-04-11$347.75$398.472,200
2003-04-10$346.00$396.476,700
2003-04-09$344.25$394.464,000
2003-04-08$343.25$393.312,000
2003-04-07$343.50$393.602,900
2003-04-04$342.70$392.681,000
2003-04-03$342.50$392.461,700
2003-04-02$340.00$389.599,200
2003-04-01$341.00$390.745,900
2003-03-31$340.00$389.593,800
2003-03-28$339.00$388.445,000
2003-03-27$338.10$387.413,400
2003-03-26$338.50$387.875,600
2003-03-25$339.00$388.442,000
2003-03-24$337.00$386.154,300
2003-03-21$339.50$389.023,500
2003-03-20$334.50$383.294,500
2003-03-19$337.00$386.156,700
2003-03-18$339.50$389.0212,700
2003-03-17$330.00$378.138,100
2003-03-14$320.51$367.267,000
2003-03-13$321.00$367.828,900
2003-03-12$316.98$362.076,000
2003-03-11$317.26$362.3912,100
2003-03-10$317.50$362.668,100
2003-03-07$319.05$364.437,900
2003-03-06$322.00$367.8010,900
2003-03-05$321.50$367.238,900
2003-03-04$320.50$366.094,800
2003-03-03$321.50$367.2318,600
2003-02-28$324.00$370.096,700
2003-02-27$321.81$367.583,900
2003-02-26$320.00$365.526,400
2003-02-25$320.00$365.5218,900
2003-02-24$322.53$368.419,500
2003-02-21$327.50$374.086,100
2003-02-20$324.00$370.0912,700
2003-02-19$321.00$366.6629,200
2003-02-18$316.00$360.9512,200
2003-02-14$311.70$356.0410,700
2003-02-13$311.75$356.0928,400
2003-02-12$314.00$358.6631,700
2003-02-11$315.85$360.7812,500
2003-02-10$318.75$364.098,600
2003-02-07$316.50$361.5211,100
2003-02-06$317.25$362.3810,000
2003-02-05$323.24$369.226,000
2003-02-04$318.50$363.807,500
2003-02-03$321.53$367.265,000
2003-01-31$317.50$362.668,200
2003-01-30$314.50$359.234,500
2003-01-29$315.70$360.617,700
2003-01-28$315.25$360.0916,700
2003-01-27$314.01$358.6710,000
2003-01-24$316.00$360.954,000
2003-01-23$320.50$366.099,300
2003-01-22$320.00$365.523,800
2003-01-21$320.10$365.633,500
2003-01-17$321.50$367.237,400
2003-01-16$326.25$372.668,400
2003-01-15$326.50$372.949,200
2003-01-14$326.00$372.377,500
2003-01-13$323.00$368.949,800
2003-01-10$322.00$367.807,300
2003-01-09$321.02$366.683,500
2003-01-08$321.00$366.663,700
2003-01-07$322.10$367.9224,400
2003-01-06$323.87$369.9415,200
2003-01-03$323.75$369.8013,900
2003-01-02$323.50$369.5115,100