Giles E. Harrison - 25 Feb 2026 Form 4 Insider Report for WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)

Role
President
Signature
Wesley C. Bell, by Power of Attorney
Issuer symbol
WTM
Transactions as of
25 Feb 2026
Net transactions value
$0
Form type
4
Filing time
27 Feb 2026, 11:18:46 UTC
Previous filing
28 Feb 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Harrison Giles E President C/O WHITE MOUNTAINS INSURANCE GROUP, LTD, 23 SOUTH MAIN STREET, SUITE 3B Wesley C. Bell, by Power of Attorney 25 Feb 2026 0002019288

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction WTM Common Shares (restricted) Award $0 +775 +41% $0.000000 2,675 25 Feb 2026 Direct F1
holding WTM Common Shares 2 25 Feb 2026 by White Mountains Retirement Plan F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 On February 25, 2026, the Reporting Person received a restricted share award of 775 Common Shares, which vests on January 1, 2029.
F2 Reflects accumulation of 2 Common Shares in Reporting Person's Company Retirement account since his last filed report. The information in this report is based on a plan report dated as of February 25, 2026.