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WHITE MOUNTAINS INSURANCE GROUP LTD

For the period ended Sep 30, 2026. Filed Nov 5, 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.

Sep 30, 2026 · Filed Nov 5, 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 (1)Maximum Numberof Shares that MayYet Be PurchasedUnder the Plans
July 1 - July 31, 2026—$——170,007
August 1 - August 31, 2026—$——170,007
September 1 - September 30, 202611$1,998.5511169,996
Total11$1,998.5511169,996

(1)The Company’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.

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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.