REPLIGEN CORP — Director's Dealing 2010

Sep 28, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2010-09-16

Reporting Person: RYAN THOMAS F JR (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-09-16	Stock Option (Right to Buy)	$3.3	A	20000	Acquired	2020-09-16	Common Stock (20000)	Direct

Footnotes

F1: Award represents Annual Board Options issued each September to each non-employee director. Award vests in full one year from grant date on September 16, 2011.