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 — 1987

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1987-12-31$25.75$26.21188,900
1987-12-30$25.75$26.2185,600
1987-12-29$25.88$26.3474,300
1987-12-28$25.63$26.08214,200
1987-12-24$26.00$26.47101,400
1987-12-23$25.50$25.96117,400
1987-12-22$26.13$26.59361,500
1987-12-21$26.50$26.98662,000
1987-12-18$25.25$25.7096,700
1987-12-17$25.38$25.83229,700
1987-12-16$25.25$25.70176,100
1987-12-15$25.00$25.45149,500
1987-12-14$24.50$24.94474,500
1987-12-11$24.13$24.5688,300
1987-12-10$24.50$24.94123,800
1987-12-09$25.00$25.45100,800
1987-12-08$24.50$24.94103,400
1987-12-07$24.75$25.19175,300
1987-12-04$24.50$24.94135,600
1987-12-03$25.88$26.34106,900
1987-12-02$25.38$25.83314,200
1987-12-01$25.50$25.9699,200
1987-11-30$25.38$25.83154,100
1987-11-27$26.75$27.2349,500
1987-11-25$27.25$27.74124,100
1987-11-24$27.13$27.61103,500
1987-11-23$28.13$28.63121,700
1987-11-20$28.38$28.8895,000
1987-11-19$28.00$28.50158,000
1987-11-18$28.25$28.65198,700
1987-11-17$27.75$28.15263,900
1987-11-16$28.00$28.40371,400
1987-11-13$28.50$28.91209,300
1987-11-12$29.00$29.42192,400
1987-11-11$28.88$29.29293,100
1987-11-10$29.38$29.80196,000
1987-11-09$29.75$30.1844,900
1987-11-06$30.50$30.94421,400
1987-11-05$30.25$30.68206,200
1987-11-04$29.88$30.3083,400
1987-11-03$30.63$31.0646,500
1987-11-02$32.25$32.7193,300
1987-10-30$32.88$33.35141,200
1987-10-29$31.38$31.8298,800
1987-10-28$30.25$30.68151,100
1987-10-27$29.63$30.05131,300
1987-10-26$29.38$29.80354,000
1987-10-23$32.63$33.09145,600
1987-10-22$31.50$31.95782,700
1987-10-21$32.00$32.46391,000
1987-10-20$28.25$28.65388,200
1987-10-19$30.00$30.43307,600
1987-10-16$36.13$36.64740,700
1987-10-15$36.13$36.64192,700
1987-10-14$37.50$38.04184,800
1987-10-13$37.25$37.7815,200
1987-10-12$37.25$37.7849,100
1987-10-09$38.00$38.54137,000
1987-10-08$37.38$37.91269,200
1987-10-07$37.38$37.91574,200
1987-10-06$38.50$39.05323,000
1987-10-05$37.63$38.16321,100
1987-10-02$36.50$37.02337,400
1987-10-01$35.63$36.14357,100
1987-09-30$35.75$36.26265,600
1987-09-29$35.88$36.3950,100
1987-09-28$35.38$35.88158,500
1987-09-25$35.63$36.1461,800
1987-09-24$35.63$36.1424,800
1987-09-23$36.13$36.6491,300
1987-09-22$34.88$35.37144,800
1987-09-21$34.88$35.3768,700
1987-09-18$35.13$35.6391,600
1987-09-17$35.88$36.39115,000
1987-09-16$36.00$36.5237,800
1987-09-15$35.50$36.0168,500
1987-09-14$35.88$36.3950,400
1987-09-11$35.25$35.76136,200
1987-09-10$35.25$35.76275,300
1987-09-09$36.00$36.5247,300
1987-09-08$35.63$36.1492,700
1987-09-04$36.38$36.90148,600
1987-09-03$36.13$36.64136,700
1987-09-02$36.50$37.0265,400
1987-09-01$37.13$37.66182,800
1987-08-31$37.88$38.4272,500
1987-08-28$37.50$38.0446,900
1987-08-27$37.75$38.29129,100
1987-08-26$38.25$38.80142,800
1987-08-25$38.75$39.31149,000
1987-08-24$38.00$38.54134,100
1987-08-21$38.75$39.3156,200
1987-08-20$39.50$40.0778,600
1987-08-19$38.75$39.20203,700
1987-08-18$37.25$37.69160,000
1987-08-17$38.88$39.33191,200
1987-08-14$39.00$39.46265,500
1987-08-13$39.88$40.34736,800
1987-08-12$37.88$38.32543,500
1987-08-11$36.50$36.93372,900
1987-08-10$35.88$36.30111,800
1987-08-07$35.75$36.17396,000
1987-08-06$34.50$34.90206,900
1987-08-05$34.00$34.40199,800
1987-08-04$34.25$34.6580,500
1987-08-03$34.25$34.6560,800
1987-07-31$35.00$35.41246,200
1987-07-30$35.50$35.92122,400
1987-07-29$35.75$36.17240,700
1987-07-28$35.13$35.54188,800
1987-07-27$34.75$35.16138,900
1987-07-24$35.00$35.4180,200
1987-07-23$35.00$35.41678,900
1987-07-22$34.38$34.78617,000
1987-07-21$34.75$35.16134,100
1987-07-20$34.75$35.16370,900
1987-07-17$35.50$35.92105,000
1987-07-16$35.75$36.17157,800
1987-07-15$36.13$36.5565,800
1987-07-14$36.50$36.93107,200
1987-07-13$35.88$36.3071,500
1987-07-10$36.00$36.42154,600
1987-07-09$36.00$36.42155,600
1987-07-08$36.00$36.42198,000
1987-07-07$35.75$36.17149,300
1987-07-06$35.63$36.04238,500
1987-07-02$35.88$36.3072,300
1987-07-01$35.75$36.17278,900
1987-06-30$36.00$36.42112,400
1987-06-29$36.00$36.42138,100
1987-06-26$36.38$36.80105,100
1987-06-25$36.25$36.67133,200
1987-06-24$35.75$36.17137,300
1987-06-23$36.13$36.55204,200
1987-06-22$36.88$37.3149,400
1987-06-19$37.13$37.56302,000
1987-06-18$37.63$38.07128,900
1987-06-17$37.63$38.07180,500
1987-06-16$37.25$37.6965,800
1987-06-15$37.75$38.19118,500
1987-06-12$38.25$38.70125,800
1987-06-11$37.50$37.9454,500
1987-06-10$37.13$37.56147,100
1987-06-09$36.50$36.9364,300
1987-06-08$36.50$36.9383,500
1987-06-05$36.88$37.3132,800
1987-06-04$37.00$37.43275,400
1987-06-03$35.75$36.1777,200
1987-06-02$35.75$36.1727,800
1987-06-01$35.50$35.92227,900
1987-05-29$36.13$36.5554,300
1987-05-28$36.00$36.4261,400
1987-05-27$36.00$36.42205,200
1987-05-26$35.88$36.30110,600
1987-05-22$35.00$35.41199,500
1987-05-21$35.00$35.4161,100
1987-05-20$34.88$35.28170,100
1987-05-19$34.13$34.42203,300
1987-05-18$34.88$35.18261,800
1987-05-15$35.75$36.0667,200
1987-05-14$36.00$36.31215,100
1987-05-13$35.88$36.19924,300
1987-05-12$35.63$35.94204,100
1987-05-11$36.00$36.31194,100
1987-05-08$35.50$35.81103,800
1987-05-07$35.88$36.1961,900
1987-05-06$35.75$36.06416,400
1987-05-05$36.13$36.4488,400
1987-05-04$35.25$35.56149,700
1987-05-01$36.00$36.31115,500
1987-04-30$36.00$36.31146,300
1987-04-29$36.00$36.3186,600
1987-04-28$35.50$35.81144,400
1987-04-27$35.75$36.06150,800
1987-04-24$35.50$35.81288,800
1987-04-23$35.63$35.94189,600
1987-04-22$35.63$35.94196,400
1987-04-21$35.75$36.06227,200
1987-04-20$35.00$35.31250,300
1987-04-16$34.75$35.05279,100
1987-04-15$34.25$34.55192,100
1987-04-14$34.50$34.80727,100
1987-04-13$35.75$36.06525,200
1987-04-10$37.13$37.45148,500
1987-04-09$38.25$38.5899,100
1987-04-08$38.25$38.58122,600
1987-04-07$37.50$37.83223,000
1987-04-06$37.25$37.58182,600
1987-04-03$37.00$37.32418,900
1987-04-02$36.38$36.69375,000
1987-04-01$36.88$37.20484,800
1987-03-31$36.88$37.20125,100
1987-03-30$36.75$37.07179,900
1987-03-27$38.00$38.33271,800
1987-03-26$40.00$40.35202,900
1987-03-25$39.88$40.22178,700
1987-03-24$39.00$39.34235,500
1987-03-23$40.00$40.35141,600
1987-03-20$41.00$41.3668,500
1987-03-19$40.63$40.9873,100
1987-03-18$40.25$40.6093,400
1987-03-17$40.75$41.1196,100
1987-03-16$40.75$41.11133,100
1987-03-13$42.00$42.37207,600
1987-03-12$41.38$41.7477,800
1987-03-11$41.00$41.36113,300
1987-03-10$40.75$41.11206,500
1987-03-09$40.25$40.6049,800
1987-03-06$40.38$40.7357,100
1987-03-05$40.50$40.85130,400
1987-03-04$40.25$40.60190,700
1987-03-03$40.38$40.7380,500
1987-03-02$40.50$40.8594,900
1987-02-27$40.00$40.3543,300
1987-02-26$40.75$41.1177,300
1987-02-25$41.00$41.26205,000
1987-02-24$39.88$40.13118,800
1987-02-23$39.13$39.37126,600
1987-02-20$40.00$40.25173,300
1987-02-19$39.88$40.13258,900
1987-02-18$38.50$38.74364,000
1987-02-17$38.13$38.36298,700
1987-02-13$37.50$37.7499,400
1987-02-12$36.88$37.11276,900
1987-02-11$36.50$36.73213,400
1987-02-10$36.50$36.73168,500
1987-02-09$37.50$37.74131,400
1987-02-06$37.75$37.99179,900
1987-02-05$37.63$37.86528,200
1987-02-04$37.00$37.23456,100
1987-02-03$36.00$36.23158,700
1987-02-02$36.63$36.86259,600
1987-01-30$37.00$37.23130,300
1987-01-29$37.13$37.36375,500
1987-01-28$36.25$36.48169,500
1987-01-27$36.00$36.23318,100
1987-01-26$35.13$35.35156,600
1987-01-23$35.38$35.60590,800
1987-01-22$35.25$35.47306,400
1987-01-21$35.50$35.72192,200
1987-01-20$36.25$36.48564,100
1987-01-19$35.38$35.60272,400
1987-01-16$35.00$35.22540,300
1987-01-15$35.63$35.85348,100
1987-01-14$37.38$37.6190,800
1987-01-13$38.00$38.24119,700
1987-01-12$38.00$38.2492,000
1987-01-09$37.88$38.11249,600
1987-01-08$38.25$38.49111,500
1987-01-07$36.50$36.73118,300
1987-01-06$36.50$36.73204,400
1987-01-05$36.00$36.23209,900
1987-01-02$35.00$35.2261,600