REPLIGEN CORP — Director's Dealing 2012

Jun 20, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2012-05-24

Reporting Person: GRIFFITH MICHAEL A (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-24	Stock Option (Right to Buy)	$4.53	A	24000	Acquired	2022-05-24	Common Stock (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.