White Mountains director gifts 2 company shares

WHITE MOUNTAINS INSURANCE GROUP LTD (WTM) director David Allen Tanner reported a bona fide gift transfer of 2 Common Shares on 2026-08-31.

Rhea-AI Filing Summary

WHITE MOUNTAINS INSURANCE GROUP LTD (WTM) director David Allen Tanner reported a bona fide gift transfer of 2 Common Shares on 2026-08-31. The transaction carried a stated price of $0.00 per share, and his directly held position after the gift was 2,012 Common Shares.

Insider Trade Summary

2 shares gifted

Gift 1 txn

Insider Tanner David Allen

Role Director

Type	Security	Shares	Price	Value
Gift	Common Shares	2	$0.00	$0.00

Holdings After Transaction: Common Shares — 2,012 shares (Direct)

Key Figures

Shares gifted: 2 Common Shares Stated transaction price per share: $0.00 Shares held after transaction: 2,012 Common Shares +1 more

4 metrics

Shares gifted 2 Common Shares Bona fide gift on 2026-08-31 by director David Allen Tanner

Stated transaction price per share $0.00 Price field for the bona fide gift of 2 Common Shares

Shares held after transaction 2,012 Common Shares Direct ownership by David Allen Tanner following the gift

Gift transactions reported 1 Count of bona fide gift transactions in this Form 4

Key Terms

bona fide gift, Form 4, direct ownership

3 terms

bona fide gift financial

"transaction_code_description: "Bona fide gift""

A bona fide gift is a genuine, voluntary transfer of money, property, or benefits from one party to another made without expectation of repayment, services, or hidden conditions. Investors care because such gifts can affect company disclosures, related‑party transaction rules, tax treatment, and perceived conflicts of interest; think of it like someone giving you a present with no strings attached — but on a corporate scale, auditors and regulators need to verify it really is unconditional.

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.

direct ownership financial

"ownership_type: "direct""

FAQ

What insider transaction did WTM director David Allen Tanner report?

He reported a bona fide gift of 2 Common Shares of WHITE MOUNTAINS INSURANCE GROUP LTD on 2026-08-31, with a stated price of $0.00 per share, leaving him with 2,012 Common Shares held directly after the transaction.

Did WHITE MOUNTAINS INSURANCE GROUP LTD (WTM) shares get sold in this Form 4?

No. The Form 4 for WTM reports a gift transaction coded "G" (bona fide gift) involving 2 Common Shares, not an open-market sale or purchase.

How many WHITE MOUNTAINS (WTM) shares did David Allen Tanner transfer?

David Allen Tanner transferred 2 Common Shares of WHITE MOUNTAINS INSURANCE GROUP LTD in a transaction classified as a bona fide gift on 2026-08-31.

What is David Allen Tanner’s WTM shareholding after the reported gift?

After the reported bona fide gift of 2 Common Shares, David Allen Tanner directly holds 2,012 Common Shares of WHITE MOUNTAINS INSURANCE GROUP LTD.

Was the WTM insider gift made under a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is not checked, indicating the reported bona fide gift of 2 Common Shares was not affirmed as made under a Rule 10b5-1 trading plan.

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

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Available on EDGAR 08/31/2026 - 05:04 PM Accepted by SEC EDGAR 08/31/2026 - 05:04 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^*

Tanner David Allen

(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)
08/31/2026

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	08/31/2026		G		2	D	$0	2,012	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:

	Wesley C. Bell, by Attorney-In-Fact for David A. Tanner	08/31/2026
	** 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)