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WHITE MOUNTAINS INSURANCE GROUP LTD

For the period ended Aug 26, 2026. Filed Aug 27, 2026.

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About this filing

A notice of a major event between regular reports, such as results, a deal or a change of executives. It is often the first formal record of the news.

Aug 26, 2026 · Filed Aug 27, 2026

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WTM$2,241.12-2.3%Stored close · as of Nov 6, 2026
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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

WHITE MOUNTAINS INSURANCE GROUP, LTD.
August 27, 2026By:/s/ MICHAELA J. HILDRETH Michaela J. Hildreth Managing Director and Chief Accounting Officer
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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.