White Mountains (WTM) CFO reports initial direct and indirect share ownership

Rhea-AI Filing Summary

White Mountains Insurance Group Ltd reported the initial holdings of its Chief Financial Officer in a Form 3 dated as of 01/01/2026. The filing shows direct ownership of 503 Common Shares and 1,100 Common Shares (Restricted), as well as indirect ownership of 12 Common Shares held through the White Mountains Retirement Plan. The indirect position is based on a plan report dated as of December 22, 2025.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Papamichael Michael A

(Last) (First) (Middle)

C/O WHITE MOUNTAINS INSURANCE GROUP, LTD

23 SOUTH MAIN STREET, SUITE 3B

(Street)

HANOVER NH 03755

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
01/01/2026

3. Issuer Name and Ticker or Trading Symbol
WHITE MOUNTAINS INSURANCE GROUP LTD [ WTM ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Shares	503	D
Common Shares (Restricted)	1,100	D
Common Shares	12	I(1)	by White Mountains Retirement Plan

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Based on a White Mountains Retirement Plan report dated as of December 22, 2025.

	Wesley C. Bell, by Power of Attorney	01/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider position is disclosed for White Mountains (WTM) in this filing?

The filing discloses the holdings of the Chief Financial Officer of White Mountains Insurance Group Ltd as a reporting person.

How many White Mountains (WTM) common shares does the CFO own directly?

The CFO directly owns 503 Common Shares and 1,100 Common Shares (Restricted) of White Mountains Insurance Group Ltd.

What indirect ownership does the CFO report in White Mountains (WTM)?

The CFO reports indirect beneficial ownership of 12 Common Shares held by White Mountains Retirement Plan, as noted in the filing.

What is the date of the event requiring this White Mountains (WTM) Form 3?

The event date requiring this ownership statement is listed as 01/01/2026.

What is the source for the reported retirement plan holdings for White Mountains (WTM)?

The 12 Common Shares held through the retirement plan are based on a White Mountains Retirement Plan report dated as of December 22, 2025.

Is this White Mountains (WTM) ownership report filed by one or multiple reporting persons?

The document indicates that the Form is filed by one reporting person, not by a group.