ROBERT LAWRENCE SEELIG - 01 Jan 2026 Form 4 Insider Report for WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)

Role
EVP & General Counsel
Signature
Wesley C. Bell, by Power of Attorney
Issuer symbol
WTM
Transactions as of
01 Jan 2026
Net transactions value
-$827,056
Form type
4
Filing time
02 Jan 2026, 18:04:43 UTC
Previous filing
28 Feb 2025
Next filing
27 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
SEELIG ROBERT LAWRENCE EVP & General Counsel C/O WHITE MOUNTAINS INSURANCE GROUP, LTD, 23 SOUTH MAIN STREET, SUITE 3B, HANOVER Wesley C. Bell, by Power of Attorney 02 Jan 2026 0001188198

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction WTM Common Shares Tax liability $827,056 -398 -2.2% $2078.03 17,907 01 Jan 2026 Direct F1
holding WTM Common Shares (restricted) 1,725 01 Jan 2026 Direct F1
holding WTM Common Shares 4 01 Jan 2026 by wife and dependent children
holding WTM Common Shares 583 01 Jan 2026 By WTM Retirement Plan F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 On January 1, 2026, 1,000 restricted Common Shares became unrestricted. 398 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations.
F2 Reflects accumulation of 3 Common Shares in Reporting Person's White Mountains Retirement account since his last filed report. The information in this report is based on a plan report dated as of December 22, 2025.