White Mountains (NYSE: WTM) EVP awarded 775 restricted shares vesting in 2029

Rhea-AI Filing Summary

SEELIG ROBERT LAWRENCE reported acquisition or exercise transactions in this Form 4 filing.

White Mountains Insurance Group Ltd. executive vice president and general counsel Robert Lawrence Seelig reported receiving an award of 775 restricted common shares on February 25, 2026. The award was granted at no cost and is scheduled to vest on January 1, 2029.

After this grant, he directly held 2,500 restricted common shares and 17,907 other common shares, along with small indirect holdings of 4 common shares through his wife and dependent children and 583 common shares through the White Mountains Retirement Plan.

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

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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^*

SEELIG ROBERT LAWRENCE

(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)
	EVP & General Counsel

3. Date of Earliest Transaction (Month/Day/Year)
02/25/2026

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 (restricted)	02/25/2026		A		775	A	$0	2,500(1)	D
Common Shares								17,907	D
Common Shares								4	I	by wife and dependent children
Common Shares								583	I	By WTM 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 February 25, 2026, the Reporting Person received a restricted share award of 775 Common Shares, which vests on January 1, 2029.

	Wesley C. Bell, by Power of Attorney	02/25/2026
	** 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.

FAQ

What insider transaction did WTM executive Robert Seelig report?

Robert Seelig reported receiving an award of 775 restricted common shares of White Mountains Insurance Group Ltd. on February 25, 2026. The shares were granted at no cost as part of his compensation package and increase his equity stake in the company.

When do Robert Seelig’s 775 restricted WTM shares vest?

The 775 restricted common shares awarded to Robert Seelig are scheduled to vest on January 1, 2029. Until vesting, the shares are subject to restrictions typically tied to continued employment or other conditions defined in the award agreement.

How many White Mountains restricted shares does Robert Seelig hold after this award?

Following the February 25, 2026 award, Robert Seelig directly holds 2,500 restricted common shares of White Mountains Insurance Group Ltd. These restricted shares are separate from his other directly held common shares and generally vest over time under the grant terms.

What are Robert Seelig’s total direct WTM common share holdings?

As of the reported date, Robert Seelig directly holds 17,907 common shares of White Mountains Insurance Group Ltd., in addition to 2,500 restricted common shares. These holdings reflect his personal direct ownership, excluding shares held indirectly through family or benefit plans.

Does Robert Seelig report any indirect ownership of WTM shares?

Yes. Robert Seelig reports indirect ownership of 4 common shares held by his wife and dependent children and 583 common shares held through the White Mountains Retirement Plan. These positions are disclosed separately from his direct holdings for transparency on all beneficial interests.

Did Robert Seelig pay for the 775 restricted WTM shares he received?

No. The 775 restricted common shares awarded to Robert Seelig were granted at a price of $0.0000 per share. This indicates the shares were provided as a compensation award rather than purchased in an open-market or cash transaction.