Michael A. Papamichael - 01 Jan 2026 Form 4 Insider Report for WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)

Role: Chief Financial Officer
Signature: Wesley C. Bell, by Power of Attorney
Issuer symbol: WTM
Transactions as of: 01 Jan 2026
Net transactions value: -$272,222
Form type: 4
Filing time: 02 Jan 2026, 21:28:22 UTC
Next filing: 27 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Papamichael Michael A	Chief Financial Officer	C/O WHITE MOUNTAINS INSURANCE GROUP, LTD, 23 SOUTH MAIN STREET, SUITE 3B, HANOVER	Wesley C. Bell, by Power of Attorney	02 Jan 2026	0002090784

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	WTM	Common Shares	Tax liability	$272,222	-131	-15%	$2078.03	772	01 Jan 2026	Direct	F1
holding	WTM	Common Shares (Restricted)						700	01 Jan 2026	Direct	F1
holding	WTM	Common Shares						12	01 Jan 2026	by White Mountains Retirement Plan

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

Explanation of Responses:

Id	Content
F1	On January 1, 2026, 400 restricted Common Shares became unrestricted. 131 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations.