Michaela Hildreth - 23 Dec 2025 Form 4 Insider Report for WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)

Role: MD & Chief Accounting Officer
Signature: Wesley C Bell, by Power of Attorney
Issuer symbol: WTM
Transactions as of: 23 Dec 2025
Net transactions value: $0
Form type: 4
Filing time: 23 Dec 2025, 13:55:23 UTC
Previous filing: 28 Feb 2025
Next filing: 05 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Hildreth Michaela	MD & Chief Accounting Officer	C/O WHITE MOUNTAINS INSURANCE GROUP, LTD, 23 SOUTH MAIN STREET, SUITE 3B, HANOVER	Wesley C Bell, by Power of Attorney	23 Dec 2025	0001863001

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	WTM	Common Shares	Gift	$0	-60	-2.7%	$0.000000	2,165	23 Dec 2025	Direct
holding	WTM	Common Shares (Restricted)						1,825	23 Dec 2025	Direct
holding	WTM	Common Shares						20	23 Dec 2025	by 401(k)	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Reflects accumulation of 2 Common Shares in Reporting Person's Company retirement account since his last filed report. The information in this report is based on a plan report dated as of December 22, 2025.