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.

View year

Historical Stock Price — 1986

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1986-12-31$35.13$35.35110,300——
1986-12-30$34.25$34.47155,900——
1986-12-29$34.88$35.0967,300——
1986-12-26$35.75$35.9722,100——
1986-12-24$35.50$35.7293,100——
1986-12-23$36.00$36.23350,800——
1986-12-22$36.38$36.60151,000——
1986-12-19$36.50$36.73153,300——
1986-12-18$36.25$36.48139,400——
1986-12-17$35.50$35.72104,800——
1986-12-16$35.50$35.72338,500——
1986-12-15$35.75$35.97302,500——
1986-12-12$35.00$35.22150,500——
1986-12-11$35.38$35.60144,600——
1986-12-10$36.50$36.73250,600——
1986-12-09$34.50$34.72133,800——
1986-12-08$35.50$35.72140,800——
1986-12-05$35.75$35.97300,300——
1986-12-04$35.75$35.97210,500——
1986-12-03$36.38$36.60236,600——
1986-12-02$36.13$36.35314,200——
1986-12-01$34.38$34.59129,200——
1986-11-28$33.75$33.9698,800——
1986-11-26$34.00$34.2187,000——
1986-11-25$34.00$34.21382,400——
1986-11-24$34.50$34.72205,000——
1986-11-21$33.88$34.09305,100——
1986-11-20$32.75$32.96332,900——
1986-11-19$32.50$32.63304,100——
1986-11-18$32.88$33.01209,600——
1986-11-17$33.75$33.88130,700——
1986-11-14$34.25$34.3975,300——
1986-11-13$33.75$33.88806,200——
1986-11-12$35.00$35.14361,500——
1986-11-11$36.13$36.2799,800——
1986-11-10$36.13$36.27186,400——
1986-11-07$35.88$36.0235,200——
1986-11-06$35.50$35.64186,600——
1986-11-05$36.13$36.2776,200——
1986-11-04$36.25$36.39237,500——
1986-11-03$36.00$36.14189,100——
1986-10-31$36.50$36.64217,300——
1986-10-30$37.63$37.77189,200——
1986-10-29$38.00$38.15170,500——
1986-10-28$37.25$37.4052,700——
1986-10-27$37.63$37.7743,400——
1986-10-24$37.75$37.90505,200——
1986-10-23$38.25$38.4046,000——
1986-10-22$37.50$37.6556,500——
1986-10-21$37.00$37.15121,600——
1986-10-20$37.25$37.4013,800——
1986-10-17$37.63$37.7736,200——
1986-10-16$38.38$38.5375,700——
1986-10-15$38.00$38.1581,700——
1986-10-14$37.63$37.7758,100——
1986-10-13$38.25$38.4016,400——
1986-10-10$37.75$37.9074,300——
1986-10-09$37.75$37.90205,000——
1986-10-08$36.25$36.3965,200——
1986-10-07$35.13$35.2640,600——
1986-10-06$35.25$35.3927,400——
1986-10-03$35.25$35.3956,400——
1986-10-02$34.75$34.8954,200——
1986-10-01$34.88$35.01115,300——
1986-09-30$34.50$34.6437,300——
1986-09-29$34.25$34.3987,600——
1986-09-26$35.75$35.8919,100——
1986-09-25$35.63$35.7737,100——
1986-09-24$35.88$36.0250,500——
1986-09-23$35.00$35.14103,600——
1986-09-22$34.13$34.26130,900——
1986-09-19$33.38$33.51157,700——
1986-09-18$34.25$34.39114,600——
1986-09-17$34.13$34.26276,100——
1986-09-16$34.00$34.13252,300——
1986-09-15$34.75$34.8964,700——
1986-09-12$34.25$34.39157,500——
1986-09-11$35.38$35.52163,500——
1986-09-10$37.00$37.1590,600——
1986-09-09$36.50$36.64240,000——
1986-09-08$36.50$36.64182,900——
1986-09-05$37.75$37.90265,900——
1986-09-04$38.75$38.90117,100——
1986-09-03$39.13$39.28151,800——
1986-09-02$39.38$39.5379,500——
1986-08-29$39.63$39.78176,700——
1986-08-28$39.75$39.9185,000——
1986-08-27$40.00$40.16175,800——
1986-08-26$40.25$40.41171,400——
1986-08-25$39.75$39.9186,600——
1986-08-22$39.63$39.7866,300——
1986-08-21$39.50$39.66240,900——
1986-08-20$39.50$39.5850,200——
1986-08-19$39.38$39.4649,200——
1986-08-18$39.88$39.9687,200——
1986-08-15$39.88$39.96106,300——
1986-08-14$40.13$40.21290,600——
1986-08-13$39.63$39.71125,800——
1986-08-12$38.88$38.96133,000——
1986-08-11$37.75$37.83110,000——
1986-08-08$37.13$37.20148,900——
1986-08-07$38.13$38.2081,400——
1986-08-06$38.50$38.5885,900——
1986-08-05$38.50$38.58126,000——
1986-08-04$37.50$37.58115,200——
1986-08-01$37.88$37.9561,600——
1986-07-31$37.63$37.7080,000——
1986-07-30$37.88$37.95172,700——
1986-07-29$37.38$37.4594,000——
1986-07-28$37.50$37.58158,800——
1986-07-25$38.13$38.20239,000——
1986-07-24$37.75$37.8325,600——
1986-07-23$37.88$37.95104,700——
1986-07-22$38.00$38.08158,700——
1986-07-21$37.13$37.20134,300——
1986-07-18$37.00$37.08199,900——
1986-07-17$36.00$36.07118,300——
1986-07-16$35.00$35.0788,600——
1986-07-15$34.75$34.82118,300——
1986-07-14$35.25$35.3296,900——
1986-07-11$36.63$36.70247,000——
1986-07-10$35.25$35.32189,200——
1986-07-09$35.00$35.07141,500——
1986-07-08$35.25$35.32207,000——
1986-07-07$36.63$36.70216,800——
1986-07-03$38.00$38.08203,100——
1986-07-02$37.75$37.8389,700——
1986-07-01$37.75$37.83237,000——
1986-06-30$36.75$36.83289,800——
1986-06-27$35.25$35.32279,600——
1986-06-26$35.25$35.32173,300——
1986-06-25$35.00$35.07384,200——
1986-06-24$34.50$34.57202,100——
1986-06-23$34.00$34.07201,400——
1986-06-20$33.50$33.57206,400——
1986-06-19$35.00$35.07276,100——
1986-06-18$34.75$34.82143,300——
1986-06-17$33.88$33.94207,800——
1986-06-16$34.50$34.5777,800——
1986-06-13$34.88$34.95569,300——
1986-06-12$34.25$34.32279,400——
1986-06-11$34.25$34.32308,100——
1986-06-10$33.75$33.82409,500——
1986-06-09$33.63$33.69236,300——
1986-06-06$35.25$35.32179,500——
1986-06-05$36.13$36.20124,500——
1986-06-04$35.88$35.95227,900——
1986-06-03$35.88$35.95448,400——
1986-06-02$36.88$36.95295,300——
1986-05-30$38.63$38.70152,800——
1986-05-29$38.13$38.20305,400——
1986-05-28$38.75$38.83574,200——
1986-05-27$37.88$37.95382,900——
1986-05-23$37.25$37.33522,200——
1986-05-22$36.88$36.95276,900——
1986-05-21$36.50$36.50654,500——
1986-05-20$36.00$36.00122,900——
1986-05-19$36.00$36.00176,000——
1986-05-16$36.25$36.25255,900——
1986-05-15$36.13$36.12463,900——
1986-05-14$36.50$36.50444,900——
1986-05-13$36.38$36.37973,100——
1986-05-12$36.50$36.50294,000——
1986-05-09$37.25$37.252,074,100——
1986-05-08$38.00$38.00625,800——
1986-05-07$38.25$38.2595,900——
1986-05-06$38.75$38.7539,500——
1986-05-05$38.75$38.7592,300——
1986-05-02$37.75$37.75108,700——
1986-05-01$37.13$37.1279,100——
1986-04-30$37.25$37.25148,100——
1986-04-29$37.38$37.3797,900——
1986-04-28$37.88$37.8855,100——
1986-04-25$39.00$39.0072,500——
1986-04-24$38.88$38.87233,300——
1986-04-23$39.88$39.8779,400——
1986-04-22$40.25$40.2579,700——
1986-04-21$40.38$40.38113,800——
1986-04-18$41.50$41.50355,300——
1986-04-17$42.50$42.50173,300——
1986-04-16$43.25$43.2520,000——
1986-04-15$42.25$42.2546,500——
1986-04-14$42.75$42.7541,200——
1986-04-11$41.75$41.7597,500——
1986-04-10$40.75$40.7519,500——
1986-04-09$40.75$40.7585,800——
1986-04-08$40.75$40.7597,500——
1986-04-07$39.00$39.0087,300——
1986-04-04$40.00$40.0053,100——
1986-04-03$41.38$41.3771,400——
1986-04-02$41.50$41.50146,400——
1986-04-01$41.88$41.87119,700——
1986-03-31$42.63$42.6299,700——
1986-03-27$41.50$41.50214,000——
1986-03-26$40.13$40.12110,100——
1986-03-25$40.00$40.0076,900——
1986-03-24$40.25$40.2552,400——
1986-03-21$42.50$42.50131,800——
1986-03-20$43.13$43.1246,300——
1986-03-19$42.88$42.8777,900——
1986-03-18$41.50$41.50141,000——
1986-03-17$39.75$39.75114,500——
1986-03-14$39.50$39.50230,000——
1986-03-13$38.50$38.50299,000——
1986-03-12$38.38$38.37252,000——
1986-03-11$38.50$38.50191,500——
1986-03-10$38.50$38.5099,700——
1986-03-07$39.50$39.5037,100——
1986-03-06$39.75$39.75204,700——
1986-03-05$38.50$38.5057,400——
1986-03-04$38.88$38.8737,500——
1986-03-03$39.38$39.3754,400——
1986-02-28$39.25$39.25158,000——
1986-02-27$37.50$37.50196,800——
1986-02-26$35.63$35.62397,400——
1986-02-25$35.75$35.75133,300——
1986-02-24$37.13$37.12104,200——
1986-02-21$37.25$37.25154,500——
1986-02-20$36.38$36.37123,800——
1986-02-19$35.75$35.7588,900——
1986-02-18$36.63$36.6299,100——
1986-02-14$37.00$37.0093,900——
1986-02-13$37.50$37.5040,400——
1986-02-12$37.63$37.62118,700——
1986-02-11$37.75$37.7577,800——
1986-02-10$37.75$37.7590,300——
1986-02-07$38.00$38.0092,500——
1986-02-06$37.63$37.62100,400——
1986-02-05$37.63$37.62122,700——
1986-02-04$37.38$37.37163,000——
1986-02-03$36.50$36.50212,600——
1986-01-31$36.63$36.62357,500——
1986-01-30$36.63$36.62390,100——
1986-01-29$36.50$36.50299,100——
1986-01-28$35.00$35.0052,600——
1986-01-27$35.38$35.37186,000——
1986-01-24$34.50$34.50130,100——
1986-01-23$34.00$34.00195,700——
1986-01-22$32.63$32.62313,500——
1986-01-21$31.75$31.7552,500——
1986-01-20$32.00$32.0079,700——
1986-01-17$32.50$32.50154,100——
1986-01-16$33.25$33.25204,200——
1986-01-15$33.00$33.00204,800——
1986-01-14$32.13$32.12105,900——
1986-01-13$32.00$32.00169,400——
1986-01-10$32.63$32.6256,300——
1986-01-09$31.75$31.75196,600——
1986-01-08$33.38$33.37279,300——
1986-01-07$33.00$33.00227,400——
1986-01-06$32.00$32.0075,800——
1986-01-03$31.00$31.0061,500——
1986-01-02$30.88$30.87128,900——