White Mountains CFO reports share withholding on vested stock

White Mountains Insurance Group Ltd. Chief Financial Officer, a reporting officer and insider of the company, reported a routine equity transaction.

Rhea-AI Filing Summary

White Mountains Insurance Group Ltd. Chief Financial Officer, a reporting officer and insider of the company, reported a routine equity transaction. On January 1, 2026, 400 restricted common shares became unrestricted. To cover tax obligations related to this vesting, 131 common shares were withheld by the company, coded as an "F" transaction for tax withholding. After this event, the reporting person beneficially owns 772 common shares directly, 700 restricted common shares directly, and 12 common shares indirectly through the White Mountains Retirement Plan.

Insider Trade Summary

Exercise Price or Tax Liability: 131 shares

Exercise Price or Tax Liability 3 txns

Insider Papamichael Michael A

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Shares	131	$2,078.03	$272K
holding	Common Shares (Restricted)	--	--	--
holding	Common Shares	--	--	--

Holdings After Transaction: Common Shares — 772 shares (Direct); Common Shares (Restricted) — 700 shares (Direct); Common Shares — 12 shares (Indirect, by White Mountains Retirement Plan)

Footnotes (1)

1. 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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did WHITE MOUNTAINS INSURANCE GROUP LTD (WTM) disclose?

The company disclosed that on January 1, 2026, 400 restricted common shares held by its Chief Financial Officer became unrestricted, and 131 common shares were withheld by the company to satisfy the reporting person's tax obligations.

Who is the insider involved in this WTM Form 4 filing?

The insider is an officer of White Mountains Insurance Group Ltd. serving as Chief Financial Officer, who is required to report beneficial ownership and changes in company equity securities.

How many shares were withheld for taxes in this WTM insider transaction?

In connection with the vesting of restricted stock on January 1, 2026, the company withheld 131 common shares to satisfy the reporting person's tax obligations.

How many restricted shares vested for the WTM officer on January 1, 2026?

The explanation states that on January 1, 2026, 400 restricted common shares became unrestricted for the reporting person.

What is the White Mountains (WTM) officer’s direct and indirect share ownership after the transaction?

Following the reported transaction, the officer beneficially owns 772 common shares directly, 700 restricted common shares directly, and 12 common shares indirectly through the White Mountains Retirement Plan.

Is this WTM Form 4 transaction related to a Rule 10b5-1 trading plan?

The form includes a checkbox for indicating Rule 10b5-1(c) trading plans, but the provided excerpt does not show this box as checked in connection with the reported transaction.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 01/02/2026 - 09:28 PM Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
01/01/2026

4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Shares	01/01/2026		F		131	D	$2,078.03	772(1)	D
Common Shares (Restricted)								700(1)	D
Common Shares								12	I	by White Mountains Retirement Plan

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

	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 4 (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.