Form 4: White Mountains Officer Gifts Shares Under 10b5-1 Plan

Michaela Hildreth, MD & Chief Accounting Officer at White Mountains Insurance Group, reported gifting 60 common shares.

Summary

• Michaela Hildreth, MD & Chief Accounting Officer of White Mountains Insurance Group Ltd. (WTM), reported a disposition of 60 common shares.
• The transaction, coded as a gift ('G'), occurred on December 23, 2025, with a price of $0 per share.
• This transaction was made pursuant to a Rule 10b5-1(c) contract, instruction, or written plan.
• Following the reported transaction, Hildreth directly beneficially owns 2,165 common shares and 1,825 restricted common shares.
• Hildreth also indirectly beneficially owns 20 common shares through a 401(k) account, reflecting an accumulation of 2 common shares since the last report, based on a plan report dated December 22, 2025.

Sentiment

Score: 5

Explanation: The filing reports a routine insider transaction (gift of shares) which is neutral in sentiment and common for officers managing their equity holdings, especially when executed under a 10b5-1 plan.

Future Outlook

No forward-looking statements or guidance were provided in this filing.

Industry Context

This filing represents a routine insider transaction by a company officer, which is a standard disclosure and does not indicate broader industry trends or competitive shifts.

Corporate Governance

Related Party Transactions

• The disposition of shares by an officer of the company is inherently a related party transaction, though no additional related party dealings beyond the stock activity are disclosed.

Stakeholder Impact

• Minimal impact on shareholders due to the small number of shares involved in the gift transaction.

Key Dates

Keywords

White Mountains Insurance Group, WTM, Form 4, insider transaction, share disposition, gift, Michaela Hildreth, Chief Accounting Officer, 10b5-1 plan