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 — 1999

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1999-12-31$120.50$135.564,700
1999-12-30$119.50$134.438,400
1999-12-29$119.13$134.011,200
1999-12-28$119.63$134.572,800
1999-12-27$119.00$133.873,000
1999-12-23$118.50$133.315,100
1999-12-22$119.00$133.8711,500
1999-12-21$116.50$131.064,100
1999-12-20$118.13$132.893,500
1999-12-17$119.50$134.431,800
1999-12-16$118.00$132.7529,600
1999-12-15$118.00$132.759,300
1999-12-14$119.00$133.8737,900
1999-12-13$118.00$132.7520,500
1999-12-10$119.75$134.714,200
1999-12-09$117.44$132.118,100
1999-12-08$116.00$130.055,700
1999-12-07$116.75$130.895,500
1999-12-06$116.63$130.75137,000
1999-12-03$117.13$131.312,500
1999-12-02$117.19$131.3814,600
1999-12-01$120.63$135.235,300
1999-11-30$118.00$132.294,600
1999-11-29$119.00$133.4111,300
1999-11-26$121.13$135.795,300
1999-11-24$122.25$137.052,800
1999-11-23$121.94$136.7029,700
1999-11-22$122.00$136.7712,400
1999-11-19$121.25$135.9314,900
1999-11-18$121.06$135.726,100
1999-11-17$121.06$135.7217,800
1999-11-16$121.25$135.9314,700
1999-11-15$122.75$137.6116,800
1999-11-12$122.25$137.0526,600
1999-11-11$121.00$135.658,100
1999-11-10$122.00$136.77700
1999-11-09$122.00$136.7722,300
1999-11-08$123.50$138.455,700
1999-11-05$122.63$137.476,600
1999-11-04$123.63$138.5911,400
1999-11-03$120.50$135.0929,800
1999-11-02$120.00$134.5338,300
1999-11-01$126.00$141.2616,900
1999-10-29$126.50$141.826,700
1999-10-28$126.06$141.3331,900
1999-10-27$126.50$141.824,600
1999-10-26$129.25$144.9031,300
1999-10-25$130.50$146.3017,600
1999-10-22$134.50$150.7919,200
1999-10-21$130.00$145.7429,500
1999-10-20$125.50$140.7012,300
1999-10-19$121.00$135.656,400
1999-10-18$121.50$136.219,700
1999-10-15$125.50$140.701,400
1999-10-14$127.88$143.369,700
1999-10-13$128.00$143.504,800
1999-10-12$130.00$145.741,700
1999-10-11$130.81$146.651,700
1999-10-08$131.19$147.076,100
1999-10-07$132.00$147.984,800
1999-10-06$134.50$150.795,200
1999-10-05$133.50$149.66900
1999-10-04$134.00$150.230
1999-10-01$134.00$150.235,800
1999-09-30$135.63$152.05200
1999-09-29$135.88$152.33700
1999-09-28$136.50$153.0311,800
1999-09-27$135.50$151.916,900
1999-09-24$135.56$151.982,100
1999-09-23$135.56$151.987,500
1999-09-22$131.75$147.70700
1999-09-21$131.13$147.0018,600
1999-09-20$134.00$150.233,500
1999-09-17$133.25$149.381,200
1999-09-16$133.50$149.663,600
1999-09-15$133.50$149.663,500
1999-09-14$132.50$148.542,300
1999-09-13$133.50$149.666,100
1999-09-10$135.06$151.422,400
1999-09-09$136.56$153.105,100
1999-09-08$137.06$153.219,500
1999-09-07$132.63$148.254,000
1999-09-03$131.50$146.992,300
1999-09-02$130.50$145.872,500
1999-09-01$130.13$145.464,900
1999-08-31$130.25$145.596,800
1999-08-30$132.50$148.114,000
1999-08-27$133.00$148.674,900
1999-08-26$132.00$147.555,800
1999-08-25$132.75$148.392,500
1999-08-24$133.00$148.670
1999-08-23$133.00$148.67900
1999-08-20$133.75$149.511,300
1999-08-19$133.50$149.23800
1999-08-18$132.75$148.394,900
1999-08-17$131.25$146.713,700
1999-08-16$132.00$147.55700
1999-08-13$131.13$146.575,700
1999-08-12$131.13$146.571,400
1999-08-11$131.75$147.275,100
1999-08-10$132.50$148.114,900
1999-08-09$130.06$145.399,700
1999-08-06$131.00$146.432,500
1999-08-05$131.00$146.432,800
1999-08-04$131.19$146.6412,900
1999-08-03$132.75$148.393,300
1999-08-02$132.56$148.181,800
1999-07-30$132.25$147.831,100
1999-07-29$131.38$146.851,300
1999-07-28$131.75$147.27700
1999-07-27$131.75$147.271,700
1999-07-26$130.50$145.8714,900
1999-07-23$131.00$146.434,800
1999-07-22$133.00$148.672,800
1999-07-21$134.31$150.142,800
1999-07-20$134.00$149.796,000
1999-07-19$134.00$149.7916,300
1999-07-16$137.50$153.706,500
1999-07-15$141.25$157.894,400
1999-07-14$140.56$157.122,900
1999-07-13$140.50$157.057,000
1999-07-12$140.50$157.052,400
1999-07-09$139.50$155.939,500
1999-07-08$139.50$155.932,700
1999-07-07$138.06$154.333,000
1999-07-06$141.00$157.611,800
1999-07-02$142.25$159.011,100
1999-07-01$143.00$159.8510,800
1999-06-30$141.00$157.6111,200
1999-06-29$145.50$162.642,300
1999-06-28$144.50$161.525,900
1999-06-25$142.00$158.731,300
1999-06-24$141.25$157.893,600
1999-06-23$140.13$156.637,100
1999-06-22$139.00$155.384,300
1999-06-21$138.88$155.244,000
1999-06-18$138.00$154.264,900
1999-06-17$137.56$153.773,200
1999-06-16$137.00$153.1420,200
1999-06-15$137.00$153.145,000
1999-06-14$137.75$153.9811,500
1999-06-11$141.75$158.45100
1999-06-10$141.50$158.177,100
1999-06-09$140.25$156.334,600
1999-06-08$140.00$156.051,700
1999-06-07$141.00$157.16600
1999-06-04$141.50$157.725,400
1999-06-03$143.25$159.675,100
1999-06-02$145.25$161.906,100
1999-06-01$149.00$166.082,900
1999-05-28$149.00$166.089,900
1999-05-27$146.50$163.294,000
1999-05-26$148.50$165.5212,700
1999-05-25$148.25$165.243,200
1999-05-24$148.06$165.033,000
1999-05-21$149.00$166.087,700
1999-05-20$148.00$164.963,800
1999-05-19$147.00$163.854,500
1999-05-18$144.75$161.3410,800
1999-05-17$143.00$159.397,600
1999-05-14$145.63$162.323,400
1999-05-13$146.00$162.745,100
1999-05-12$146.00$162.744,200
1999-05-11$145.00$161.628,500
1999-05-10$145.00$161.6210,800
1999-05-07$141.88$158.142,900
1999-05-06$141.69$157.931,500
1999-05-05$141.31$157.513,100
1999-05-04$142.00$158.286,800
1999-05-03$143.00$159.396,000
1999-04-30$144.00$160.515,600
1999-04-29$145.75$162.461,500
1999-04-28$147.00$163.8511,300
1999-04-27$145.50$162.181,700
1999-04-26$144.75$161.344,700
1999-04-23$143.50$159.958,900
1999-04-22$145.00$161.626,200
1999-04-21$140.50$156.607,000
1999-04-20$140.75$156.886,800
1999-04-19$142.75$159.114,100
1999-04-16$144.25$160.7814,100
1999-04-15$141.25$157.443,800
1999-04-14$140.63$156.745,300
1999-04-13$138.75$154.654,200
1999-04-12$137.13$152.8421,200
1999-04-09$131.38$146.435,100
1999-04-08$132.75$147.974,400
1999-04-07$133.06$148.314,900
1999-04-06$132.00$147.137,200
1999-04-05$133.00$148.242,000
1999-04-01$133.50$148.804,300
1999-03-31$133.06$148.316,900
1999-03-30$133.00$148.2416,800
1999-03-29$132.38$147.5514,400
1999-03-26$123.88$138.0730,000
1999-03-25$120.50$134.317,500
1999-03-24$122.25$136.261,600
1999-03-23$123.00$137.105,300
1999-03-22$123.25$137.383,600
1999-03-19$124.25$138.4913,800
1999-03-18$126.38$140.862,000
1999-03-17$126.56$141.077,300
1999-03-16$127.75$142.397,000
1999-03-15$128.63$143.375,400
1999-03-12$129.75$144.621,200
1999-03-11$129.75$144.624,200
1999-03-10$131.50$146.133,500
1999-03-09$132.06$146.7510,600
1999-03-08$132.50$147.24500
1999-03-05$132.75$147.5235,600
1999-03-04$132.31$147.032,600
1999-03-03$131.75$146.403,900
1999-03-02$131.63$146.271,900
1999-03-01$131.75$146.403,800
1999-02-26$131.50$146.1310,300
1999-02-25$130.50$145.022,500
1999-02-24$132.00$146.682,800
1999-02-23$132.00$146.681,900
1999-02-22$133.00$147.792,300
1999-02-19$133.00$147.7914,600
1999-02-18$133.38$148.211,800
1999-02-17$133.75$148.634,900
1999-02-16$135.50$150.575,600
1999-02-12$137.50$152.797,200
1999-02-11$139.00$154.4626,800
1999-02-10$139.00$154.462,900
1999-02-09$139.06$154.532,900
1999-02-08$140.00$155.572,900
1999-02-05$140.56$156.203,600
1999-02-04$141.13$156.824,100
1999-02-03$142.31$158.1422,700
1999-02-02$146.25$162.529,300
1999-02-01$150.00$166.6810,600
1999-01-29$145.75$161.96800
1999-01-28$146.13$162.382,700
1999-01-27$145.38$161.5511,000
1999-01-26$147.88$164.322,600
1999-01-25$146.50$162.805,200
1999-01-22$144.06$160.093,800
1999-01-21$144.94$161.066,100
1999-01-20$146.00$162.245,900
1999-01-19$144.75$160.852,600
1999-01-15$145.00$161.134,200
1999-01-14$144.44$160.503,200
1999-01-13$144.63$160.718,100
1999-01-12$145.50$161.682,500
1999-01-11$145.06$161.206,300
1999-01-08$142.88$158.774,000
1999-01-07$142.50$158.35500
1999-01-06$143.00$158.913,300
1999-01-05$141.75$157.523,400
1999-01-04$142.00$157.804,300