REPLIGEN CORP — Director's Dealing 2013

Mar 12, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2013-02-28

Reporting Person: Lieber Jonathan I (CFO)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-02-28	Stock Option (Right to Buy)	$6.23	A	40000	Acquired	2023-02-28	Common Stock (40000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	15000	Direct

Footnotes

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

F2: 10,000 Options will vest and become exercisable on each of the following dates: 2/28/2014, 2/28/2015, 2/28/2016 and 2/28/2017.