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WHITE MOUNTAINS INSURANCE GROUP LTD

For the period ended Sep 30, 2025. Filed Nov 6, 2025.

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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, 2025 · Filed Nov 6, 2025

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

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Item 5. Other Information

Insider Trading Policy

The Company has policies and procedures governing the purchase, sale and/or other dispositions of our securities by directors, officers, employees or the Company itself that we believe are reasonably designed to promote compliance with insider trading laws, rules and regulations and the listing standards applicable to us. A copy of our Insider Trading Policy is filed as Exhibit 19 to our 2024 Annual Report on Form 10-K.

No trading plans were adopted orterminated during the third quarter of 2025 by a director or officer of the Company that is intended to satisfy the affirmative defense conditions of Securities Exchange Act Rule 10b5-1(c) or a non-Rule 10b5-1(c) trading agreement.

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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.