4processed

Form 4 — Insider Transaction

WHITE MOUNTAINS INSURANCE GROUP LTD(WTM)

Filing Date

May 21, 2026

Accepted

May 21, 2026

Accession No.

0000776867-26-000040

CIK

0000776867

Insider Transactions

InsiderTitleTypeSharesPriceValueOwned AfterSecurityDate
Chu JohnOther135$0335Common SharesMay 21, 2026