REPLIGEN CORP — Director's Dealing 2013

Mar 27, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2013-03-26

Reporting Person: HERLIHY WALTER C (Director, PRESIDENT, CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-03-26	Common Stock	M	65000	$5.51	Acquired	566898	Direct
2013-03-26	Common Stock	F	51982	$6.89	Disposed	514916	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-03-26	Stock Option (Right to Buy)	$5.51	M	65000	Disposed	2013-04-23	Common Stock (65000)	Direct

Footnotes

F1: Payment made via forfeiture of 51,982 shares of Common Stock valued at the Closing Price of $6.89 on March 26, 2013.