REPLIGEN CORP — Director's Dealing 2009

Apr 30, 2009

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2008-09-12

Reporting Person: RYAN THOMAS F JR (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2008-09-12	Stock Option (Right to Buy)	$5.08	A	20000	Acquired	2018-09-12	Common Stock (20000)	Direct

Footnotes

F1: 4,000 shares become exercisable on each of 9/12/2009, 9/12/2010, 9/12/2011, 9/12/2012, and 9/12/2013.