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 — 2017

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2017-12-29$851.28$1,051.166,900
2017-12-28$849.18$1,048.5715,300
2017-12-27$846.21$1,044.9017,600
2017-12-26$844.00$1,042.1713,400
2017-12-22$846.00$1,044.6413,300
2017-12-21$848.00$1,047.1119,000
2017-12-20$851.07$1,050.9010,300
2017-12-19$850.80$1,050.5741,600
2017-12-18$861.00$1,063.1621,600
2017-12-15$861.65$1,063.9749,800
2017-12-14$860.75$1,062.8616,500
2017-12-13$865.11$1,068.2420,100
2017-12-12$876.52$1,082.339,300
2017-12-11$872.90$1,077.8610,300
2017-12-08$868.21$1,072.0715,200
2017-12-07$868.27$1,072.1414,300
2017-12-06$874.06$1,079.2923,700
2017-12-05$875.00$1,080.4519,200
2017-12-04$888.39$1,096.9923,900
2017-12-01$887.19$1,095.5023,000
2017-11-30$890.99$1,100.2036,300
2017-11-29$889.71$1,098.6214,200
2017-11-28$886.00$1,094.0319,500
2017-11-27$880.66$1,087.4410,300
2017-11-24$877.00$1,082.927,300
2017-11-22$875.65$1,081.2520,000
2017-11-21$878.50$1,084.7713,800
2017-11-20$878.00$1,084.1616,000
2017-11-17$870.97$1,075.4817,400
2017-11-16$873.00$1,077.9816,900
2017-11-15$878.69$1,085.0113,000
2017-11-14$882.57$1,089.8014,300
2017-11-13$881.49$1,088.4715,400
2017-11-10$887.87$1,096.3413,000
2017-11-09$893.90$1,103.7927,200
2017-11-08$886.55$1,094.7116,900
2017-11-07$878.25$1,084.4715,200
2017-11-06$881.97$1,089.0620,600
2017-11-03$886.80$1,095.0216,300
2017-11-02$888.52$1,097.1521,000
2017-11-01$895.90$1,106.2636,500
2017-10-31$889.15$1,097.9223,500
2017-10-30$887.12$1,095.4213,400
2017-10-27$892.59$1,102.1717,100
2017-10-26$895.61$1,105.9026,500
2017-10-25$891.54$1,100.8812,500
2017-10-24$890.00$1,098.9725,400
2017-10-23$888.00$1,096.5021,800
2017-10-20$888.00$1,096.5017,800
2017-10-19$882.98$1,090.319,200
2017-10-18$879.74$1,086.3021,900
2017-10-17$873.95$1,079.1625,900
2017-10-16$867.48$1,071.1711,500
2017-10-13$870.56$1,074.9720,400
2017-10-12$867.84$1,071.6118,300
2017-10-11$865.04$1,068.1511,700
2017-10-10$864.04$1,066.9218,000
2017-10-09$857.45$1,058.7817,300
2017-10-06$866.86$1,070.4010,900
2017-10-05$868.04$1,071.8613,100
2017-10-04$861.34$1,063.5818,700
2017-10-03$867.26$1,070.8923,300
2017-10-02$865.00$1,068.1020,600
2017-09-29$857.00$1,058.2341,300
2017-09-28$854.80$1,055.5110,600
2017-09-27$851.06$1,050.8926,100
2017-09-26$859.25$1,061.0047,100
2017-09-25$843.82$1,041.9526,800
2017-09-22$842.87$1,040.7844,100
2017-09-21$844.00$1,042.1737,200
2017-09-20$850.87$1,050.6630,100
2017-09-19$844.05$1,042.2328,800
2017-09-18$849.40$1,048.8428,000
2017-09-15$859.70$1,061.5685,200
2017-09-14$872.01$1,076.7619,700
2017-09-13$872.82$1,077.7620,600
2017-09-12$874.66$1,080.0321,000
2017-09-11$870.00$1,074.2820,500
2017-09-08$864.48$1,067.4625,900
2017-09-07$859.00$1,060.6921,900
2017-09-06$863.00$1,065.6324,100
2017-09-05$863.46$1,066.2024,900
2017-09-01$872.70$1,077.6121,100
2017-08-31$871.07$1,075.6017,100
2017-08-30$866.51$1,069.9721,500
2017-08-29$863.78$1,066.6010,100
2017-08-28$865.40$1,068.6016,000
2017-08-25$870.00$1,074.2825,800
2017-08-24$864.18$1,067.0914,800
2017-08-23$866.80$1,070.3314,900
2017-08-22$862.58$1,065.1211,900
2017-08-21$862.00$1,064.409,300
2017-08-18$864.63$1,067.6510,200
2017-08-17$864.87$1,067.9434,500
2017-08-16$850.65$1,050.389,500
2017-08-15$851.01$1,050.837,200
2017-08-14$851.08$1,050.9216,300
2017-08-11$859.36$1,061.1418,000
2017-08-10$852.58$1,052.7716,600
2017-08-09$844.29$1,042.5313,100
2017-08-08$852.70$1,052.9220,400
2017-08-07$851.80$1,051.8020,900
2017-08-04$850.10$1,049.7113,900
2017-08-03$855.70$1,056.626,800
2017-08-02$852.79$1,053.0316,700
2017-08-01$863.27$1,065.978,700
2017-07-31$864.60$1,067.6110,100
2017-07-28$859.33$1,061.1019,600
2017-07-27$856.54$1,057.6613,100
2017-07-26$858.54$1,060.1321,900
2017-07-25$871.00$1,075.5110,400
2017-07-24$865.15$1,068.299,700
2017-07-21$868.44$1,072.354,300
2017-07-20$869.63$1,073.8238,600
2017-07-19$866.60$1,070.0826,100
2017-07-18$861.61$1,063.9227,300
2017-07-17$863.20$1,065.8832,400
2017-07-14$852.50$1,052.6730,200
2017-07-13$856.95$1,058.1628,800
2017-07-12$864.90$1,067.9826,000
2017-07-11$852.00$1,052.0519,600
2017-07-10$856.74$1,057.9013,700
2017-07-07$859.90$1,061.819,500
2017-07-06$853.45$1,053.8411,500
2017-07-05$864.80$1,067.8619,500
2017-07-03$876.98$1,082.9029,700
2017-06-30$868.63$1,072.5913,600
2017-06-29$870.00$1,074.286,900
2017-06-28$869.43$1,073.5710,000
2017-06-27$869.62$1,073.818,800
2017-06-26$865.92$1,069.2416,900
2017-06-23$862.44$1,064.9424,300
2017-06-22$864.00$1,066.8711,600
2017-06-21$869.18$1,073.2714,200
2017-06-20$868.32$1,072.2022,600
2017-06-19$866.68$1,070.1810,200
2017-06-16$874.20$1,079.4642,300
2017-06-15$878.85$1,085.2119,100
2017-06-14$879.70$1,086.2623,600
2017-06-13$879.92$1,086.5316,200
2017-06-12$872.80$1,077.7428,700
2017-06-09$870.10$1,074.4021,100
2017-06-08$868.85$1,072.8621,100
2017-06-07$868.66$1,072.6210,000
2017-06-06$866.58$1,070.0515,700
2017-06-05$866.84$1,070.3814,800
2017-06-02$870.57$1,074.9827,100
2017-06-01$867.96$1,071.7615,000
2017-05-31$860.08$1,062.0317,300
2017-05-30$863.66$1,066.4516,800
2017-05-26$878.35$1,084.5923,500
2017-05-25$874.17$1,079.4314,300
2017-05-24$876.89$1,082.7925,100
2017-05-23$870.00$1,074.2814,300
2017-05-22$870.43$1,074.8132,600
2017-05-19$861.55$1,063.8410,200
2017-05-18$864.22$1,067.1411,900
2017-05-17$862.20$1,064.6515,900
2017-05-16$860.91$1,063.0521,800
2017-05-15$867.52$1,071.2216,400
2017-05-12$854.70$1,055.3923,400
2017-05-11$868.96$1,072.9912,500
2017-05-10$871.06$1,075.599,600
2017-05-09$868.75$1,072.7314,400
2017-05-08$865.00$1,068.1016,700
2017-05-05$864.10$1,066.9912,200
2017-05-04$867.34$1,070.9914,400
2017-05-03$872.04$1,076.8041,000
2017-05-02$849.92$1,049.4827,900
2017-05-01$857.14$1,058.4020,000
2017-04-28$858.94$1,060.6220,400
2017-04-27$867.00$1,070.577,000
2017-04-26$867.00$1,070.575,900
2017-04-25$865.00$1,068.108,600
2017-04-24$863.70$1,066.5012,900
2017-04-21$862.56$1,065.0914,500
2017-04-20$859.83$1,061.7212,800
2017-04-19$864.53$1,067.5215,200
2017-04-18$869.69$1,073.9014,400
2017-04-17$863.00$1,065.639,900
2017-04-13$860.32$1,062.335,000
2017-04-12$863.08$1,065.737,000
2017-04-11$877.50$1,083.5417,400
2017-04-10$867.43$1,071.1010,900
2017-04-07$860.66$1,062.7416,300
2017-04-06$866.89$1,070.4410,000
2017-04-05$869.11$1,073.1844,000
2017-04-04$879.12$1,085.5411,600
2017-04-03$882.21$1,089.3512,300
2017-03-31$879.88$1,086.4816,800
2017-03-30$882.95$1,090.277,900
2017-03-29$881.45$1,088.4210,300
2017-03-28$884.01$1,091.5810,600
2017-03-27$886.85$1,095.0821,800
2017-03-24$885.59$1,093.538,900
2017-03-23$882.50$1,089.7122,400
2017-03-22$890.75$1,099.9022,100
2017-03-21$891.15$1,100.3922,200
2017-03-20$902.27$1,114.1217,400
2017-03-17$907.17$1,120.1816,500
2017-03-16$908.75$1,122.1321,800
2017-03-15$912.59$1,125.6326,700
2017-03-14$917.75$1,132.0017,900
2017-03-13$919.60$1,134.289,900
2017-03-10$922.00$1,137.2410,400
2017-03-09$921.03$1,136.0411,300
2017-03-08$923.44$1,139.027,300
2017-03-07$922.35$1,137.6715,600
2017-03-06$927.58$1,144.1211,600
2017-03-03$928.90$1,145.7512,800
2017-03-02$937.73$1,156.6428,500
2017-03-01$947.00$1,168.0830,200
2017-02-28$936.26$1,154.8335,100
2017-02-27$935.80$1,154.2634,400
2017-02-24$938.87$1,158.0514,700
2017-02-23$934.13$1,152.2052,600
2017-02-22$919.94$1,134.7020,800
2017-02-21$933.20$1,151.0534,600
2017-02-17$911.32$1,124.0714,100
2017-02-16$910.26$1,122.7621,800
2017-02-15$907.26$1,119.069,700
2017-02-14$903.80$1,114.798,700
2017-02-13$902.00$1,112.5711,200
2017-02-10$896.77$1,106.1214,300
2017-02-09$884.16$1,090.5719,200
2017-02-08$889.38$1,097.0112,200
2017-02-07$891.29$1,099.3627,600
2017-02-06$907.50$1,119.3611,500
2017-02-03$907.50$1,119.3614,700
2017-02-02$914.75$1,128.3019,300
2017-02-01$898.62$1,108.4017,500
2017-01-31$909.76$1,122.1425,200
2017-01-30$892.59$1,100.9614,800
2017-01-27$891.78$1,099.9728,800
2017-01-26$899.90$1,109.9820,300
2017-01-25$906.86$1,118.5721,000
2017-01-24$891.89$1,100.1031,400
2017-01-23$877.79$1,082.717,700
2017-01-20$876.76$1,081.4413,100
2017-01-19$872.45$1,076.1245,200
2017-01-18$863.94$1,065.6328,300
2017-01-17$847.60$1,045.4717,200
2017-01-13$844.24$1,041.3313,200
2017-01-12$843.23$1,040.089,600
2017-01-11$839.51$1,035.4914,600
2017-01-10$842.10$1,038.6914,000
2017-01-09$845.81$1,043.2613,800
2017-01-06$852.66$1,051.7113,900
2017-01-05$847.82$1,045.7425,200
2017-01-04$853.58$1,052.8517,400
2017-01-03$849.60$1,047.9417,200