REPLIGEN CORP — Director's Dealing 2008

Jul 2, 2008

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2008-07-01

Reporting Person: Goldberg Alfred Lewis (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2008-07-01	Stock Option (Right to Buy)	$4.77	A	24000	Acquired	2018-07-01	Common Stock (24000)	Direct

Footnotes

F1: 8,000 shares become exercisable on each of 7/1/2009, 7/1/2010 and 7/1/2011.