White Mountains (WTM) EVP & General Counsel reports 50-share gift

Rhea-AI Filing Summary

WHITE MOUNTAINS INSURANCE GROUP LTD executive Robert Lawrence Seelig, EVP & General Counsel, made a bona fide gift of 50 Common Shares on 2026-03-19. The gift carried no sale proceeds. After this transfer, he directly holds 17,857 Common Shares and 2,500 restricted Common Shares, plus 4 Common Shares held indirectly by his wife and dependent children and 583 Common Shares held indirectly through the WTM Retirement Plan.

Insider Trade Summary

50 shares gifted

Mixed 4 txns

Insider SEELIG ROBERT LAWRENCE

Role EVP & General Counsel

Type	Security	Shares	Price	Value
Gift	Common Shares	50	$0.00	--
holding	Common Shares (restricted)	--	--	--
holding	Common Shares	--	--	--
holding	Common Shares	--	--	--

Holdings After Transaction: Common Shares — 17,857 shares (Direct); Common Shares (restricted) — 2,500 shares (Direct); Common Shares — 4 shares (Indirect, by wife and dependent children)

Footnotes (1)

Form 4 Insider Transactions: What Each Field Means →

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^*

SEELIG ROBERT LAWRENCE

(Last) (First) (Middle)

C/O WHITE MOUNTAINS INSURANCE GROUP, LTD

23 SOUTH MAIN STREET, SUITE 3B

(Street)

HANOVER NEW HAMPSHIRE 03755

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/19/2026

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

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

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

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	03/19/2026		G		50	D	$0	17,857	D
Common Shares (restricted)								2,500	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:

	Wesley C. Bell, by Power of Attorney	03/20/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did WTM executive Robert Lawrence Seelig report?

Robert Lawrence Seelig reported a bona fide gift of 50 Common Shares of WHITE MOUNTAINS INSURANCE GROUP LTD. The transfer occurred on 2026-03-19 and was coded as a gift, meaning it was a non-market disposition with no sale proceeds received.

How many WHITE MOUNTAINS (WTM) shares does Seelig hold after the reported gift?

After the reported gift, Seelig directly holds 17,857 Common Shares and 2,500 restricted Common Shares. He also has indirect holdings of 4 Common Shares through his wife and dependent children and 583 Common Shares through the WTM Retirement Plan.

Was the WTM Form 4 transaction a market sale or purchase of shares?

The Form 4 transaction was not a market sale or purchase. It was a bona fide gift of 50 Common Shares at a stated price of $0.00 per share, indicating a gratuitous transfer rather than an open-market trade.

Does the WTM Form 4 filing show any option exercises or derivative transactions?

The filing shows no option exercises or other derivative transactions. The derivativeSummary is empty and the transactionSummary lists zero derivative transactions, indicating only a gift disposition and updated non-derivative share holdings were reported.

What indirect WHITE MOUNTAINS (WTM) holdings are associated with Seelig?

Indirectly, Seelig is associated with 4 Common Shares held by his wife and dependent children and 583 Common Shares held by the WTM Retirement Plan. These are reported as indirect ownership interests separate from his directly held and restricted shares.