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 — 1985

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1985-12-31$30.88$30.87130,300
1985-12-30$30.75$30.75202,900
1985-12-27$31.25$31.25203,900
1985-12-26$31.13$31.12146,600
1985-12-24$31.38$31.37167,100
1985-12-23$32.00$32.00142,400
1985-12-20$32.63$32.62110,300
1985-12-19$32.63$32.62134,000
1985-12-18$32.88$32.87133,100
1985-12-17$33.38$33.37204,400
1985-12-16$33.38$33.37267,700
1985-12-13$32.63$32.62194,300
1985-12-12$32.25$32.25703,700
1985-12-11$31.75$31.75353,900
1985-12-10$31.75$31.75149,800
1985-12-09$32.00$32.00268,700
1985-12-06$32.13$32.12143,100
1985-12-05$32.75$32.75241,800
1985-12-04$31.75$31.75426,500
1985-12-03$31.00$31.00238,900
1985-12-02$31.75$31.75149,800
1985-11-29$31.88$31.87108,700
1985-11-27$31.50$31.50151,200
1985-11-26$31.25$31.25181,300
1985-11-25$31.38$31.37187,800
1985-11-22$32.00$32.00221,100
1985-11-21$31.63$31.62328,600
1985-11-20$30.50$30.5096,900
1985-11-19$30.38$30.37159,800
1985-11-18$30.63$30.62211,700
1985-11-15$30.25$30.2576,200
1985-11-14$31.00$31.00180,100
1985-11-13$31.38$31.37140,600
1985-11-12$31.38$31.37474,500
1985-11-11$31.50$31.50390,900
1985-11-08$30.88$30.87198,900
1985-11-07$31.00$31.00534,200
1985-11-06$30.50$30.50886,900
1985-11-05$29.63$29.62249,900
1985-11-04$29.63$29.62197,200
1985-11-01$29.63$29.62348,100
1985-10-31$29.13$29.12504,600
1985-10-30$29.63$29.62518,000
1985-10-29$29.13$29.12853,800
1985-10-28$28.00$28.00368,700
1985-10-25$28.13$28.12491,200
1985-10-24$27.25$27.251,081,200
1985-10-23$27.75$27.754,668,600