REPLIGEN CORP — Director's Dealing 2014

Jun 9, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2014-06-05

Reporting Person: Benjamin Howard (VP Business Development)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-06-05	Common Stock	M	87036	$4.25	Acquired	115962	Direct
2014-06-05	Common Stock	F	18222	$20.30	Disposed	97740	Direct
2014-06-05	Common Stock	M	5000	$3.33	Acquired	102740	Direct
2014-06-05	Common Stock	F	820	$20.30	Disposed	101920	Direct
2014-06-05	Common Stock	M	10000	$6.23	Acquired	111920	Direct
2014-06-05	Common Stock	F	3069	$20.30	Disposed	108851	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-06-05	Stock Option (Right to Buy)	$4.25	M	87036	Disposed	2019-02-11	Common Stock (87036)	Direct
2014-06-05	Stock Option (Right to Buy)	$3.33	M	5000	Disposed	2020-07-15	Common Stock (5000)	Direct
2014-06-05	Stock Option (Right to Buy)	$6.23	M	10000	Disposed	2023-02-28	Common Stock (10000)	Direct

Footnotes

F1: Payment made via forfeiture of 18,222 shares of Common Stock valued at the Closing Price of $20.30 on June 5, 2014.

F2: Payment made via forfeiture of 820 shares of Common Stock valued at the Closing Price of $20.30 on June 5, 2014.

F3: Payment made via forfeiture of 3,069 shares of Common Stock valued at the Closing Price of $20.30 on June 5, 2014.