REPLIGEN CORP — Director's Dealing 2012

Mar 12, 2012

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2012-03-12

Reporting Person: Hall Michael (Chief Medical Officer)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	5000	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option (Right to Purchase)	$4.47	2021-01-06	Common Stock (100000)		Direct

Footnotes

F1: 20,000 shares exercisable at each of the following dates:1/6/2012, 1/6/2013, 1/6/2014, 1/6/2015, 1/6/2016