| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| CAMPBELL REID TARLTON | Director | C/O WHITE MOUNTAINS INSURANCE GROUP, LTD, 23 SOUTH MAIN STREET, SUITE 3B, HANOVER | Wesley C Bell, by Power of Attorney | 26 Nov 2025 | 0001378156 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | WTM | Common Shares | Gift | $0 | -50 | -0.32% | $0.00 | 15.4K | 25 Nov 2025 | Direct | |
| holding | WTM | Common Shares | 119 | 25 Nov 2025 | by 401(k) |