REPLIGEN CORP — Director's Dealing 2012

Mar 28, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2012-03-27

Reporting Person: RUSCHE JAMES R (Senior Vice President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-03-27	Common Stock	M	25000	$1.83	Acquired	167641	Direct
2012-03-27	Common Stock	F	8520	$5.37	Disposed	159121	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-03-27	Stock Option (Right to Buy)	$1.83	M	25000	Disposed	2015-05-13	Common Stock (25000)	Direct

Footnotes

F1: Payment made via forfeiture of 8,520 shares of Common Stock valued at the Closing Price of $5.37 on March 27, 2012.