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 — 1988

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1988-12-30$29.25$30.3077,400
1988-12-29$29.25$30.3037,900
1988-12-28$29.38$30.4219,900
1988-12-27$29.00$30.0454,500
1988-12-23$29.00$30.0425,300
1988-12-22$29.00$30.0450,300
1988-12-21$28.88$29.91103,000
1988-12-20$28.88$29.9170,100
1988-12-19$28.88$29.9129,900
1988-12-16$29.25$30.3016,800
1988-12-15$29.25$30.3019,800
1988-12-14$29.25$30.3062,400
1988-12-13$28.88$29.9150,000
1988-12-12$29.13$30.1752,500
1988-12-09$28.88$29.9151,200
1988-12-08$28.88$29.9141,400
1988-12-07$29.25$30.30101,700
1988-12-06$28.88$29.9155,000
1988-12-05$28.88$29.9178,800
1988-12-02$28.75$29.7853,000
1988-12-01$29.00$30.0429,200
1988-11-30$29.00$30.0480,400
1988-11-29$28.63$29.65100,700
1988-11-28$28.88$29.918,600
1988-11-25$28.75$29.7842,200
1988-11-23$28.75$29.7810,100
1988-11-22$28.50$29.3988,600
1988-11-21$29.25$30.1631,100
1988-11-18$29.25$30.1618,200
1988-11-17$29.38$30.2956,100
1988-11-16$29.75$30.6879,300
1988-11-15$29.75$30.6827,500
1988-11-14$29.75$30.6897,100
1988-11-11$29.63$30.5590,900
1988-11-10$29.75$30.6877,200
1988-11-09$29.75$30.68163,900
1988-11-08$29.88$30.81105,900
1988-11-07$29.50$30.42106,000
1988-11-04$30.25$31.19297,700
1988-11-03$30.50$31.45129,500
1988-11-02$30.63$31.58171,500
1988-11-01$30.88$31.8478,800
1988-10-31$30.50$31.45228,100
1988-10-28$31.25$32.23104,400
1988-10-27$30.50$31.45144,100
1988-10-26$30.50$31.45157,600
1988-10-25$31.00$31.97333,800
1988-10-24$31.88$32.8775,300
1988-10-21$31.63$32.6140,000
1988-10-20$32.00$33.0035,800
1988-10-19$31.38$32.3570,300
1988-10-18$31.63$32.6168,400
1988-10-17$31.88$32.8763,500
1988-10-14$32.25$33.26113,200
1988-10-13$32.50$33.5115,700
1988-10-12$32.63$33.6455,500
1988-10-11$32.88$33.9054,900
1988-10-10$33.13$34.1624,400
1988-10-07$33.38$34.4287,200
1988-10-06$32.75$33.7721,700
1988-10-05$32.88$33.9072,200
1988-10-04$32.75$33.7780,400
1988-10-03$32.50$33.5122,500
1988-09-30$32.63$33.6476,200
1988-09-29$32.50$33.51134,900
1988-09-28$32.38$33.3941,000
1988-09-27$32.63$33.6420,400
1988-09-26$33.00$34.0348,100
1988-09-23$32.88$33.9050,400
1988-09-22$33.00$34.0373,000
1988-09-21$33.13$34.1647,500
1988-09-20$33.00$34.0345,000
1988-09-19$33.13$34.1681,500
1988-09-16$33.38$34.4229,400
1988-09-15$32.75$33.7772,800
1988-09-14$33.00$34.03178,800
1988-09-13$32.38$33.3920,300
1988-09-12$32.50$33.5149,400
1988-09-09$32.75$33.7712,400
1988-09-08$32.88$33.90122,700
1988-09-07$32.75$33.7752,700
1988-09-06$32.50$33.5148,700
1988-09-02$32.50$33.5156,700
1988-09-01$32.00$33.0024,500
1988-08-31$32.13$33.13140,600
1988-08-30$32.00$33.00133,400
1988-08-29$32.13$33.1392,600
1988-08-26$31.50$32.4858,600
1988-08-25$31.38$32.359,100
1988-08-24$31.25$32.1070,500
1988-08-23$31.38$32.2225,100
1988-08-22$31.38$32.22107,700
1988-08-19$31.63$32.4874,200
1988-08-18$31.00$31.8441,500
1988-08-17$31.50$32.3555,000
1988-08-16$31.25$32.1096,000
1988-08-15$30.88$31.7149,700
1988-08-12$31.13$31.9739,900
1988-08-11$31.00$31.8432,100
1988-08-10$30.88$31.7149,800
1988-08-09$31.50$32.35124,900
1988-08-08$31.75$32.616,200
1988-08-05$31.50$32.35132,700
1988-08-04$31.63$32.48262,100
1988-08-03$31.50$32.35280,600
1988-08-02$30.75$31.5849,700
1988-08-01$31.00$31.8421,900
1988-07-29$31.00$31.84279,100
1988-07-28$31.00$31.84151,700
1988-07-27$30.88$31.71172,600
1988-07-26$30.75$31.5813,100
1988-07-25$30.63$31.4537,300
1988-07-22$31.38$32.2252,200
1988-07-21$31.50$32.3553,200
1988-07-20$31.50$32.3572,200
1988-07-19$30.88$31.7131,100
1988-07-18$30.88$31.7118,100
1988-07-15$31.75$32.61208,700
1988-07-14$31.88$32.74112,000
1988-07-13$32.00$32.87206,800
1988-07-12$31.00$31.8469,600
1988-07-11$31.75$32.6149,900
1988-07-08$32.38$33.25382,400
1988-07-07$32.25$33.12334,400
1988-07-06$32.25$33.1270,500
1988-07-05$32.50$33.3842,700
1988-07-01$32.63$33.51119,300
1988-06-30$32.88$33.77264,700
1988-06-29$32.75$33.64110,300
1988-06-28$32.75$33.64269,700
1988-06-27$32.13$32.99385,800
1988-06-24$32.38$33.25174,700
1988-06-23$31.75$32.61240,100
1988-06-22$30.38$31.2028,800
1988-06-21$29.75$30.5643,500
1988-06-20$30.00$30.81689,900
1988-06-17$29.63$30.43176,100
1988-06-16$29.50$30.30172,700
1988-06-15$29.63$30.43111,800
1988-06-14$29.88$30.68163,700
1988-06-13$29.13$29.91117,700
1988-06-10$28.50$29.2750,100
1988-06-09$28.38$29.1439,800
1988-06-08$28.38$29.1423,200
1988-06-07$27.88$28.6342,200
1988-06-06$28.38$29.1434,200
1988-06-03$28.25$29.0140,600
1988-06-02$28.25$29.0169,900
1988-06-01$28.50$29.27130,600
1988-05-31$28.00$28.76132,900
1988-05-27$27.63$28.376,300
1988-05-26$27.88$28.6384,700
1988-05-25$27.63$28.37285,300
1988-05-24$27.00$27.6085,000
1988-05-23$25.75$26.3227,800
1988-05-20$26.00$26.58309,500
1988-05-19$26.00$26.58143,500
1988-05-18$26.25$26.8470,900
1988-05-17$26.75$27.35101,800
1988-05-16$27.00$27.6091,400
1988-05-13$26.50$27.09100,200
1988-05-12$26.88$27.47138,200
1988-05-11$26.38$26.9657,200
1988-05-10$26.63$27.2276,100
1988-05-09$27.25$27.8670,800
1988-05-06$28.00$28.6272,200
1988-05-05$28.25$28.88146,600
1988-05-04$28.63$29.26102,400
1988-05-03$28.88$29.52144,000
1988-05-02$28.63$29.2632,200
1988-04-29$28.75$29.3963,800
1988-04-28$28.75$29.39216,500
1988-04-27$28.63$29.2656,900
1988-04-26$28.00$28.62146,900
1988-04-25$27.75$28.3736,300
1988-04-22$27.50$28.11239,300
1988-04-21$27.38$27.9934,900
1988-04-20$27.75$28.3756,400
1988-04-19$28.13$28.7544,000
1988-04-18$27.75$28.3734,200
1988-04-15$27.75$28.3717,900
1988-04-14$28.13$28.7586,200
1988-04-13$29.25$29.9077,300
1988-04-12$29.88$30.5488,600
1988-04-11$29.00$29.65102,400
1988-04-08$28.75$29.39234,400
1988-04-07$28.25$28.88200,500
1988-04-06$27.88$28.50326,500
1988-04-05$28.13$28.75180,200
1988-04-04$27.75$28.3737,600
1988-03-31$28.25$28.8866,500
1988-03-30$27.63$28.2448,500
1988-03-29$28.50$29.14100,300
1988-03-28$27.38$27.99219,200
1988-03-25$27.00$27.60186,000
1988-03-24$28.25$28.8870,900
1988-03-23$28.63$29.26181,700
1988-03-22$28.75$29.3968,000
1988-03-21$29.25$29.90136,800
1988-03-18$29.38$30.03123,800
1988-03-17$29.75$30.4182,100
1988-03-16$29.63$30.29146,400
1988-03-15$29.25$29.9073,900
1988-03-14$28.88$29.52118,600
1988-03-11$29.00$29.65275,700
1988-03-10$29.50$30.1689,100
1988-03-09$30.00$30.67218,600
1988-03-08$29.50$30.16490,200
1988-03-07$30.00$30.67432,500
1988-03-04$28.38$29.0191,400
1988-03-03$28.25$28.88130,400
1988-03-02$28.50$29.14140,700
1988-03-01$28.50$29.1460,600
1988-02-29$28.38$29.0140,100
1988-02-26$28.25$28.88105,900
1988-02-25$28.50$29.14147,500
1988-02-24$29.13$29.6569,500
1988-02-23$29.00$29.52124,400
1988-02-22$29.00$29.52171,100
1988-02-19$29.00$29.52249,100
1988-02-18$28.38$28.88170,600
1988-02-17$27.88$28.37191,700
1988-02-16$28.00$28.50462,100
1988-02-12$27.00$27.4895,900
1988-02-11$27.38$27.87147,200
1988-02-10$27.25$27.7463,200
1988-02-09$27.50$27.99123,300
1988-02-08$27.50$27.99126,400
1988-02-05$27.50$27.9984,100
1988-02-04$27.50$27.9969,900
1988-02-03$28.38$28.8831,900
1988-02-02$28.00$28.5071,200
1988-02-01$28.00$28.5090,300
1988-01-29$27.88$28.3798,500
1988-01-28$27.63$28.1252,800
1988-01-27$27.13$27.6141,600
1988-01-26$27.50$27.9962,300
1988-01-25$28.38$28.8835,200
1988-01-22$28.00$28.5012,600
1988-01-21$27.75$28.2556,800
1988-01-20$27.75$28.25100,200
1988-01-19$27.75$28.2534,600
1988-01-18$27.63$28.1215,100
1988-01-15$27.88$28.3754,600
1988-01-14$27.50$27.9928,600
1988-01-13$27.25$27.7464,400
1988-01-12$27.00$27.48298,600
1988-01-11$26.75$27.23101,700
1988-01-08$26.50$26.9874,800
1988-01-07$27.00$27.4845,800
1988-01-06$27.50$27.9979,000
1988-01-05$27.13$27.61545,400
1988-01-04$26.50$26.98124,300