| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Papamichael Michael A | Chief Financial Officer | C/O WHITE MOUNTAINS INSURANCE GROUP, LTD, 23 SOUTH MAIN STREET, SUITE 3B, HANOVER | Wesley C. Bell, by Power of Attorney | 02 Jan 2026 | 0002090784 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| holding | WTM | Common Shares | 503 | 01 Jan 2026 | Direct | ||||||
| holding | WTM | Common Shares (Restricted) | 1,100 | 01 Jan 2026 | Direct | ||||||
| holding | WTM | Common Shares | 12 | 01 Jan 2026 | by White Mountains Retirement Plan | F1 |
| Id | Content |
|---|---|
| F1 | Based on a White Mountains Retirement Plan report dated as of December 22, 2025. |