| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Hughes Violetta | CHIEF ACCOUNTING OFFICER | C/O REPLIGEN CORPORATION, 41 SEYON ST., BLDG 1, STE 100, WALTHAM | /s/ Violetta Hughes | 04 Sep 2025 | 0001991429 |
No securities are beneficially owned.
Exhibit 24.1: Power of Attorney