REPLIGEN CORP — Director's Dealing 2012

Sep 24, 2012

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2012-09-20

Reporting Person: Lieber Jonathan I (CFO)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	15000	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option (Right to Buy)	$5.98	2022-09-22	Common Stock (110000)		Direct

Footnotes

F1: 15,000 shares will vest on September 20, 2013.

F2: 22,000 shares vest and become exercisable on each of the following dates: 9/20/2013, 9/20/2014, 9/20/2015, 9/20/2016 and 9/20/2017.