| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| DAWES KAREN A | Director | C/O REPLIGEN CORPORATION, 41 SEYON ST., BLDG 1, STE 100, WALTHAM | /s/ Jennifer Carmichael (Attorney in Fact) | 18 Dec 2025 | 0001261506 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | RGEN | Common Stock | Sale | $44,275 | -275 | -0.3% | $161.00 | 91,821 | 17 Dec 2025 | Direct |