REPLIGEN CORP — Director's Dealing 2012

Aug 20, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2012-08-16

Reporting Person: GRIFFITH MICHAEL A (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-08-16	Common Stock	P	1600	$4.880	Acquired	1600	Direct
2012-08-16	Common Stock	P	200	$4.879	Acquired	1800	Direct
2012-08-16	Common Stock	P	200	$4.868	Acquired	2000	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option (Right to Buy)	$4.53	2022-05-24	Common Stock (24000)	24000	Direct

Footnotes

F1: 8,000 shares vest and become exercisable on each of the following dates: 5/24/2013, 5/24/2014 and 5/24/2015.