George Manning Rountree - 19 Dec 2025 Form 4 Insider Report for WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)

Role
Chief Executive Officer, Director
Signature
Wesley C. Bell, by Power of Attorney
Issuer symbol
WTM
Transactions as of
19 Dec 2025
Net transactions value
-$10,250,000
Form type
4
Filing time
22 Dec 2025, 10:13:58 UTC
Previous filing
28 Feb 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Rountree George Manning Chief Executive Officer, Director C/O WHITE MOUNTAINS INSURANCE GROUP, LTD, 23 SOUTH MAIN STREET, SUITE 3B, HANOVER Wesley C. Bell, by Power of Attorney 22 Dec 2025 0001457475

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction WTM Common Shares Sale $10,250,000 -5,000 -27% $2050.00 13,809 19 Dec 2025 Direct
holding WTM Common Shares (restricted) 5,425 19 Dec 2025 Direct
holding WTM Common Shares 122 19 Dec 2025 by 401(k) F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 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 December 20, 2025.