Type	Name	Date
Indenture	Second Supplemental Indenture, by and between Repligen Corporation and Wilmington Trust, National Association, as trustee	03/08/2022
Indenture	Second Supplemental Indenture, by and between Repligen Corporation and Wilmington Trust, National Association, as trustee	03/08/2022
Underwriting agreement	Underwriting Agreement, among Repligen Corporation, J.P. Morgan Securities LLC and Stifel, Nicolaus & Company, Incorporated, as representatives of the underwriters named therein	12/08/2020
Indenture	First Supplemental Indenture, by and between Repligen Corporation and Wilmington Trust, National Association	07/22/2019
Underwriting agreement	Underwriting Agreement, among Repligen Corporation, J.P. Morgan Securities LLC and Stephens Inc., as representatives of the underwriters named therein	05/01/2019
Underwriting agreement	Underwriting Agreement, among Repligen Corporation, J.P. Morgan Securities LLC and Stephens Inc., as representatives of the underwriters named therein	06/29/2017
Indenture	First Supplemental Indenture, by and between Repligen Corporation and Wilmington Trust, National Association	05/24/2016

Type	Name	Date
Employment agreement	Amended and Restated Employment Agreement, by and between Repligen Corporation and Tony J. Hunt	03/02/2015
Severance agreement	Agreement, between Repligen Corporation and Ronald Chez	05/07/2012

Type	Name	Date
Lease agreement	First Amendment to Lease, by and between Repligen Corporation and TC Saracen, LLC	07/08/2011