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 — 2009

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2009-12-31$332.66$404.6311,800
2009-12-30$330.00$401.3912,600
2009-12-29$330.99$402.606,500
2009-12-28$332.98$405.023,800
2009-12-24$333.00$405.043,400
2009-12-23$332.00$403.8314,800
2009-12-22$334.00$406.2618,700
2009-12-21$330.50$402.0017,500
2009-12-18$331.00$402.6121,800
2009-12-17$324.00$394.1011,800
2009-12-16$326.50$397.1415,900
2009-12-15$326.00$396.5322,100
2009-12-14$338.08$411.2229,600
2009-12-11$329.09$400.2920,500
2009-12-10$317.82$386.5817,300
2009-12-09$318.35$387.2220,200
2009-12-08$316.59$385.089,600
2009-12-07$316.02$384.396,900
2009-12-04$315.00$383.1522,300
2009-12-03$310.50$377.6817,100
2009-12-02$315.44$383.6813,800
2009-12-01$320.00$389.2321,300
2009-11-30$325.83$396.3261,700
2009-11-27$296.25$360.3411,400
2009-11-25$313.00$380.721,600
2009-11-24$314.03$381.975,000
2009-11-23$315.55$383.8210,900
2009-11-20$314.10$382.057,200
2009-11-19$319.43$388.5415,200
2009-11-18$316.00$384.376,000
2009-11-17$320.89$390.315,300
2009-11-16$318.90$387.8919,700
2009-11-13$314.00$381.9317,400
2009-11-12$323.50$393.4915,200
2009-11-11$316.85$385.408,800
2009-11-10$318.39$387.2712,100
2009-11-09$323.88$393.9520,100
2009-11-06$318.40$387.289,500
2009-11-05$311.90$379.3814,700
2009-11-04$315.15$383.3318,500
2009-11-03$315.38$383.6113,400
2009-11-02$312.00$379.5013,900
2009-10-30$309.41$376.3539,400
2009-10-29$307.00$373.4221,800
2009-10-28$300.00$364.9018,200
2009-10-27$302.00$367.3412,100
2009-10-26$307.70$374.2723,500
2009-10-23$320.00$389.2319,100
2009-10-22$316.00$384.3711,700
2009-10-21$309.00$375.8514,800
2009-10-20$312.30$379.875,400
2009-10-19$315.90$384.247,200
2009-10-16$312.00$379.5030,600
2009-10-15$325.30$395.6815,800
2009-10-14$325.30$395.6823,500
2009-10-13$318.90$387.8913,800
2009-10-12$327.82$398.7411,800
2009-10-09$322.00$391.6619,800
2009-10-08$318.90$387.8939,800
2009-10-07$311.00$378.2820,100
2009-10-06$310.00$377.0762,200
2009-10-05$307.10$373.5430,000
2009-10-02$298.08$362.5712,000
2009-10-01$302.95$368.4916,200
2009-09-30$307.01$373.4322,000
2009-09-29$307.00$373.4216,400
2009-09-28$304.46$370.3321,900
2009-09-25$291.00$353.9616,300
2009-09-24$291.51$354.5820,100
2009-09-23$294.00$357.6117,100
2009-09-22$301.50$366.7318,200
2009-09-21$301.02$366.1419,500
2009-09-18$300.55$365.5725,300
2009-09-17$309.45$376.4011,000
2009-09-16$312.38$379.9622,500
2009-09-15$312.00$379.5019,500
2009-09-14$311.45$378.8314,000
2009-09-11$314.59$382.6521,000
2009-09-10$311.51$378.9013,600
2009-09-09$315.00$383.1516,500
2009-09-08$309.33$376.2516,800
2009-09-04$312.00$379.5011,300
2009-09-03$311.99$379.4919,300
2009-09-02$307.00$373.4211,400
2009-09-01$310.00$377.0735,100
2009-08-31$312.00$379.5026,800
2009-08-28$312.00$379.509,800
2009-08-27$308.79$375.6014,600
2009-08-26$312.00$379.5013,500
2009-08-25$311.99$379.4917,800
2009-08-24$307.87$374.4820,500
2009-08-21$314.50$382.5432,600
2009-08-20$311.90$379.3817,000
2009-08-19$308.05$374.7022,500
2009-08-18$306.00$372.2018,100
2009-08-17$295.10$358.9425,500
2009-08-14$301.01$366.1318,800
2009-08-13$303.00$368.5515,700
2009-08-12$290.25$353.0422,800
2009-08-11$280.43$341.1021,500
2009-08-10$288.05$350.3717,900
2009-08-07$287.90$350.1919,200
2009-08-06$280.62$341.3319,300
2009-08-05$280.60$341.3119,800
2009-08-04$278.50$338.7527,000
2009-08-03$273.19$332.2938,800
2009-07-31$258.00$313.8254,400
2009-07-30$239.50$291.3221,900
2009-07-29$238.52$290.1210,500
2009-07-28$242.40$294.8415,400
2009-07-27$246.80$300.1917,500
2009-07-24$243.45$296.1215,500
2009-07-23$241.54$293.8046,400
2009-07-22$238.00$289.4923,300
2009-07-21$237.51$288.8921,000
2009-07-20$238.00$289.4922,700
2009-07-17$238.90$290.5919,000
2009-07-16$239.00$290.7144,300
2009-07-15$230.00$279.7648,100
2009-07-14$226.47$275.4728,200
2009-07-13$229.00$278.5448,500
2009-07-10$222.28$270.3723,700
2009-07-09$226.40$275.3820,800
2009-07-08$222.35$270.4533,800
2009-07-07$223.51$271.8721,900
2009-07-06$227.25$276.4126,400
2009-07-02$220.00$267.6028,300
2009-07-01$227.70$276.9625,900
2009-06-30$228.91$278.4350,600
2009-06-29$226.02$274.9241,900
2009-06-26$217.00$263.9555,700
2009-06-25$220.21$267.8562,500
2009-06-24$217.67$264.7633,100
2009-06-23$210.30$255.8035,200
2009-06-22$210.11$255.5775,200
2009-06-19$213.34$259.5063,400
2009-06-18$208.85$254.0366,900
2009-06-17$204.50$248.7447,800
2009-06-16$203.08$247.0234,100
2009-06-15$205.58$250.0640,600
2009-06-12$210.54$256.0923,800
2009-06-11$211.00$256.6524,700
2009-06-10$209.73$255.1030,500
2009-06-09$209.92$255.3442,400
2009-06-08$213.84$260.1016,800
2009-06-05$212.75$258.7828,600
2009-06-04$214.62$261.0555,900
2009-06-03$213.14$259.2538,000
2009-06-02$216.78$263.6841,200
2009-06-01$218.30$265.5354,700
2009-05-29$220.00$267.6032,900
2009-05-28$219.33$266.7834,600
2009-05-27$212.64$258.6440,000
2009-05-26$224.06$272.5342,000
2009-05-22$221.26$269.1323,000
2009-05-21$217.45$264.4947,400
2009-05-20$214.62$261.0543,600
2009-05-19$219.43$266.9041,300
2009-05-18$226.69$275.7361,300
2009-05-15$212.24$258.1641,100
2009-05-14$216.65$263.5263,600
2009-05-13$210.38$255.8964,700
2009-05-12$215.44$262.0544,000
2009-05-11$214.10$260.4256,500
2009-05-08$226.96$276.0664,900
2009-05-07$208.10$253.1246,700
2009-05-06$216.32$263.1274,600
2009-05-05$207.10$251.9164,100
2009-05-04$208.00$253.0091,900
2009-05-01$201.93$245.62103,200
2009-04-30$191.32$232.7147,000
2009-04-29$194.54$236.6350,800
2009-04-28$188.80$229.6541,000
2009-04-27$184.99$225.0150,200
2009-04-24$186.89$227.3256,200
2009-04-23$190.00$231.1173,900
2009-04-22$187.00$227.4684,600
2009-04-21$195.14$237.36111,600
2009-04-20$188.05$228.7388,900
2009-04-17$195.98$238.3847,900
2009-04-16$197.43$240.1432,700
2009-04-15$194.83$236.9843,200
2009-04-14$180.71$219.8184,800
2009-04-13$201.78$245.4350,600
2009-04-09$190.05$231.17105,700
2009-04-08$177.50$215.9029,200
2009-04-07$174.80$212.6244,300
2009-04-06$179.06$217.8032,800
2009-04-03$184.71$224.6731,400
2009-04-02$181.40$220.6597,300
2009-04-01$180.38$219.4059,600
2009-03-31$171.91$209.10142,900
2009-03-30$167.27$203.4686,800
2009-03-27$174.49$212.2438,900
2009-03-26$177.83$216.3087,900
2009-03-25$181.66$220.96108,000
2009-03-24$169.01$205.5766,300
2009-03-23$185.42$225.53102,400
2009-03-20$173.53$211.0754,900
2009-03-19$177.94$216.4469,500
2009-03-18$183.95$223.7569,700
2009-03-17$176.37$214.5338,000
2009-03-16$165.40$201.1893,900
2009-03-13$171.40$208.4851,600
2009-03-12$163.57$198.96106,000
2009-03-11$154.66$186.9057,800
2009-03-10$153.99$186.09120,800
2009-03-09$150.00$181.2769,200
2009-03-06$165.00$199.4050,100
2009-03-05$163.80$197.9595,800
2009-03-04$182.88$221.0174,200
2009-03-03$186.60$225.5058,800
2009-03-02$192.09$232.14100,400
2009-02-27$198.01$239.2953,400
2009-02-26$202.55$244.7860,000
2009-02-25$194.50$235.0560,100
2009-02-24$204.67$247.34110,200
2009-02-23$200.00$241.7054,200
2009-02-20$208.00$251.3662,300
2009-02-19$209.50$253.1832,800
2009-02-18$218.00$263.4534,400
2009-02-17$214.00$258.6239,300
2009-02-13$224.00$270.7036,100
2009-02-12$228.25$275.8470,800
2009-02-11$232.43$280.8946,700
2009-02-10$222.36$268.7250,600
2009-02-09$230.25$278.2546,800
2009-02-06$237.20$286.6572,100
2009-02-05$231.00$279.1659,700
2009-02-04$228.75$276.4447,600
2009-02-03$231.41$279.6563,500
2009-02-02$238.62$288.3733,300
2009-01-30$241.50$291.8523,500
2009-01-29$247.00$298.5039,800
2009-01-28$277.70$335.6084,200
2009-01-27$273.00$329.9231,500
2009-01-26$265.00$320.2518,500
2009-01-23$268.56$324.5525,500
2009-01-22$271.00$327.5053,400
2009-01-21$275.00$332.3349,000
2009-01-20$246.10$297.4162,700
2009-01-16$275.07$332.4235,000
2009-01-15$262.00$316.6247,200
2009-01-14$260.00$314.2125,600
2009-01-13$285.45$344.9621,100
2009-01-12$271.99$328.6937,800
2009-01-09$275.00$332.3325,200
2009-01-08$274.94$332.2617,300
2009-01-07$264.10$319.1623,300
2009-01-06$286.00$345.6317,900
2009-01-05$275.64$333.1136,600
2009-01-02$263.40$318.3121,400