REPLIGEN CORP — Director's Dealing 2014

Nov 12, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2014-11-10

Reporting Person: GRIFFITH MICHAEL A (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-11-10	Common Stock	M	16000	$4.53	Acquired	25274	Direct
2014-11-10	Common Stock	S	7342	$22.86	Disposed	17932	Direct
2014-11-10	Common Stock	S	16000	$22.92	Disposed	1932	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-11-10	Stock Option (Right to Buy)	$4.53	M	16000	Acquired	2022-05-24	Common Stock (16000)	Direct

Footnotes

F1: $22.92 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.78 to $23.06, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Comission, upon request, full information regarding the number of shares sold at each seperate price within the range.

F2: 8,000 shares vest and become exercisable on each of the following dates: 5/24/2013, 5/24/2014 and 5/24/2015.