| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Downing Cristal N | Chief Comm. & Public Afrs Ofcr | MERCK & CO., INC., 126 EAST LINCOLN AVENUE, RAHWAY | /s/ Kelly E. W. Grez as Attorney-in-Fact for Cristal N. Downing | 12 Nov 2025 | 0001879216 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | MRK | Common Stock | Sale | -$616K | -7.09K | -100% | $87.00 | 0 | 10 Nov 2025 | Direct |