White Mountains (NYSE: WTM) grants Klar 113 shares at $0

Rhea-AI Filing Summary

WHITE MOUNTAINS INSURANCE GROUP LTD (WTM) reported that a director received an equity award. Reporting person Stephen Klar acquired 113 common shares of WTM on 2026-08-26 as a pro-rated Annual Director Share Award, recorded at a price of $0.00 per share. Following this grant, he holds 113 common shares directly.

Insider Trade Summary

Net Buyer: 113 shares

Net Buy 1 txn

Insider Klar Stephen

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Shares F1	113	$0.00	$0.00

Holdings After Transaction: Common Shares — 113 shares (Direct)

Footnotes (1)

1. F1. Pro-rated Annual Director Share Award

Key Figures

Shares acquired: 113 common shares Transaction price per share: $0.00 per share Shares owned after transaction: 113 common shares

3 metrics

Shares acquired 113 common shares Grant, award, or other acquisition on 2026-08-26

Transaction price per share $0.00 per share Reported for the pro-rated Annual Director Share Award

Shares owned after transaction 113 common shares Direct ownership by director Stephen Klar following the grant

Key Terms

Grant, award, or other acquisition, Pro-rated Annual Director Share Award, Form 4

3 terms

Grant, award, or other acquisition financial

"transaction_code_description: "Grant, award, or other acquisition""

Pro-rated Annual Director Share Award financial

"Footnote F1 states: "Pro-rated Annual Director Share Award""

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

What insider transaction was reported at WTM in this Form 4?

The filing reports that director Stephen Klar acquired 113 common shares of WHITE MOUNTAINS INSURANCE GROUP LTD as a pro-rated Annual Director Share Award on 2026-08-26, at a reported price of $0.00 per share, increasing his direct holdings to 113 shares.

Who is the reporting person in the WTM Form 4 filing?

The reporting person is Stephen Klar, identified as a director of WHITE MOUNTAINS INSURANCE GROUP LTD (WTM). He is not listed as an officer or ten percent owner in this filing.

How many WTM shares does the director hold after this transaction?

After the reported equity award, director Stephen Klar holds 113 common shares of WHITE MOUNTAINS INSURANCE GROUP LTD directly, as stated in the post-transaction holdings field of the Form 4.

Was the WTM director share award a market purchase or a grant?

It was a grant, not a market purchase. The transaction code is A (grant, award, or other acquisition), and the footnote describes it as a Pro-rated Annual Director Share Award with a reported price of $0.00 per share.

Is the WTM Form 4 transaction part of a Rule 10b5-1 trading plan?

The document-level Rule 10b5-1 checkbox is marked false, indicating the transaction was not affirmatively reported as made under a Rule 10b5-1 trading plan.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/27/2026 - 03:46 PM Accepted by SEC EDGAR 08/27/2026 - 03:46 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^*

Klar Stephen

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/26/2026

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	08/26/2026		A		113(1)	A	$0	113	D

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. Pro-rated Annual Director Share Award

	Wesley C. Bell, Attorney-in-Fact for Stephen Klar	08/27/2026
	** 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)