Repligen does not keep shareholder records in house. Questions about your registered shares, replacement of a lost stock certificate, stock transfers or changes of address should be directed to Repligen's transfer agent:

Company Headquarters

Repligen Corporation
41 Seyon St.Building 1, Suite 100
Waltham, MA 02453

800.622.2259 (Toll-Free)
781.250.0111 (Phone)
781.250.0115 (Fax)


Investors Relations Team

Jacob Johnson
Vice President, Investor Relations

Steven Chehames, IRC
Director, Investor Relations

investors@repligen.com


Transfer Agent

Equiniti Trust Company
PO Box 500
Newark, NJ 07101
800.937.5449 (Toll-Free)

www.equinti.com
helpast@equinity.com