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:
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)
Jacob JohnsonVice President, Investor RelationsSteven Chehames, IRCDirector, Investor Relationsinvestors@repligen.com
Equiniti Trust Company PO Box 500 Newark, NJ 07101 800.937.5449 (Toll-Free)