REPLIGEN CORP — Director's Dealing 2010

Sep 29, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2010-07-15

Reporting Person: HERLIHY WALTER C (Director, PRESIDENT, CEO)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-07-15	Stock Option (Right to Buy)	$3.33	A	50000	Acquired	2020-07-15	Common Stock (50000)	Direct

Footnotes

F1: 10,000 shares vest and become exercisable on each of the following dates: 7/15/2011, 7/15/2012, 7/15/2013, 7/15/2014 and 7/15/2015.