Does the WTM Form 4 show any insider share sales by Margaret Dillon?

The WTM Form 4 does not report any insider share sales by Margaret Dillon. It records only an acquisition coded as a grant of 135 Common Shares, bringing her direct ownership to 1,080 shares, with no dispositions or derivative exercises disclosed in this filing.

Director at White Mountains (NYSE: WTM) gets 135-share award

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Dillon Margaret reported acquisition or exercise transactions in this Form 4 filing.

WHITE MOUNTAINS INSURANCE GROUP LTD director Margaret Dillon received an annual share award of 135 Common Shares. The grant was recorded at a price of $0.00 per share as compensation, not a market purchase. Following this award, her direct holdings total 1,080 Common Shares.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Dillon Margaret

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Shares	135	$0.00	--

Holdings After Transaction: Common Shares — 1,080 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares granted: 135 Common Shares Grant price: $0.00 per share Shares owned after grant: 1,080 Common Shares +1 more

4 metrics

Shares granted 135 Common Shares Annual Director Share Award on May 21, 2026

Grant price $0.00 per share Equity compensation, not an open-market purchase

Shares owned after grant 1,080 Common Shares Direct holdings following the Form 4 transaction

Transaction date May 21, 2026 Date of Annual Director Share Award

Key Terms

Annual Director Share Award, Grant, award, or other acquisition, Common Shares

3 terms

Grant, award, or other acquisition financial

"transaction code description is "Grant, award, or other acquisition""

Common Shares financial

"security_title": "Common Shares""

Common shares are the basic units of ownership in a company that give holders a claim on profits and a right to vote on key matters, like electing the board. Think of them as membership cards in a club: they let you share in successes and losses, but in a bankruptcy or liquidation they are paid after creditors and preferred shareholders, so their value can swing more and matters for assessing risk and potential return.

Form 4 Insider Transactions: What Each Field Means →

05/22/2026 - 10:33 AM

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^*

Dillon Margaret

(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)
05/21/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Shares	05/21/2026		A		135⁽¹⁾	A	$0	1,080	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Annual Director Share Award

	Wesley C. Bell, by Power of Attorney	05/21/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did WHITE MOUNTAINS (WTM) report for Margaret Dillon?

WHITE MOUNTAINS (WTM) reported that director Margaret Dillon received an annual award of 135 Common Shares. The award was recorded at $0.00 per share and is classified as compensation, increasing her direct holdings to 1,080 Common Shares after the transaction.

Was the WTM insider transaction a market purchase or a compensation grant?

The WTM insider transaction was a compensation grant, not a market purchase. Director Margaret Dillon received 135 Common Shares at $0.00 per share as an “Annual Director Share Award,” reflecting routine board compensation rather than open-market buying or selling activity.

How many WHITE MOUNTAINS (WTM) shares does Margaret Dillon hold after this Form 4?

After this Form 4 transaction, director Margaret Dillon holds 1,080 Common Shares of WHITE MOUNTAINS (WTM). Her holdings increased due to the grant of 135 Common Shares as part of an Annual Director Share Award, all reported as directly owned shares.

What does transaction code A mean in the WTM Form 4 filing?

In the WTM Form 4, transaction code A indicates a grant, award, or other acquisition. Here it reflects an Annual Director Share Award of 135 Common Shares to director Margaret Dillon, provided as equity compensation rather than a cash-funded purchase in the open market.