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WHITE MOUNTAINS INSURANCE GROUP LTD

For the period ended Mar 31, 2026. Filed May 6, 2026.

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About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Mar 31, 2026 · Filed May 6, 2026

WTM$2,256.20+0.7%Stored close · as of Nov 9, 2026

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Item 1A. Risk Factors

There have been no material changes to any of the risk factors previously disclosed in the Registrant’s 2025 Annual Report on Form 10-K.

MonthsTotal Number ofShares PurchasedAverage PricePaid per ShareTotal Number of Shares Purchased as Part of Publicly Announced Plans (2)Maximum Numberof Shares that MayYet Be PurchasedUnder the Plans (1)
January 1 - January 31, 2026 (1)11,445$2,058.117,216262,378
February 1 - February 28, 20261,177$2,047.781,177261,201
March 1 - March 31, 2026—$——261,201
Total12,622$2,057.158,393261,201

(1)Of the shares White Mountains repurchased in January 2026, 4,229 were to satisfy employee income tax withholding pursuant to employee benefit plans, which do not reduce the amount available under the Board repurchase authorizations.

(2)White Mountains’s Board of Directors has authorized the Company to repurchase its common shares, from time to time, subject to market conditions. The repurchase authorizations do not have a stated expiration date.

None.

None.

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.