REPLIGEN CORP — Director's Dealing 2015

Mar 19, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2015-03-19

Reporting Person: Benjamin Howard (VP Business Development)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-03-18	Common stock	M	10000	$6.23	Acquired	58542	Direct
2015-03-18	Common stock	M	3807	$15.91	Acquired	62349	Direct
2015-03-18	Common stock	S	15795	$32.6333	Disposed	46554	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-03-18	StockOption (Right to Buy)	$6.23	M	10000	Disposed	2023-02-28	Common Stock (10000)	Direct
2015-03-18	Stock Option (Right to Buy)	$15.91	M	3807	Disposed	2024-02-27	Common Stock (3807)	Direct

Footnotes

F1: 1. This transaction was executed in multiple trades at prices ranging from $32.55 to $32.728. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2: 2. 3,807 shares vest and become exercisable on each of the following dates: 2/27/2015, 2/27/2016 and 2/27/2017.