REPLIGEN CORP - Director's Dealing 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2014-06-06

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

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-06-06	Common Stock	M	20000	$5.87	Acquired	582432	Direct
2014-06-06	Common Stock	F	5752	$20.41	Disposed	576680	Direct
2014-06-06	Common Stock	M	10000	$3.33	Acquired	586680	Direct
2014-06-06	Common Stock	F	1632	$20.41	Disposed	585048	Direct
2014-06-06	Common Stock	M	21250	$6.23	Acquired	606298	Direct
2014-06-06	Common Stock	F	6486	$20.41	Disposed	599812	Direct

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-06-06	Stock Option (Right to Buy)	$5.87	M	20000	Disposed	2018-06-06	Common Stock (20000)	Direct
2014-06-06	Stock Option (Right to Buy)	$3.33	M	10000	Disposed	2020-07-15	Common Stock (10000)	Direct
2014-06-06	Stock Option (Right to Buy)	$6.23	M	21250	Disposed	2023-02-28	Common Stock (21250)	Direct

F1: Payment made via forfeiture of 5,752 shares of Common Stock valued at the Closing Price of $20.41 on June 6, 2014.

F2: Payment made via forfeiture of 1,632 shares of Common Stock valued at the Closing Price of $20.41 on June 6, 2014.

F3: Payment made via forfeiture of 6,486 shares of Common Stock valued at the Closing Price of $20.41 on June 6, 2014.