REPLIGEN CORP — Director's Dealing 2016

May 13, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2016-05-11

Reporting Person: Benjamin Howard (VP Business Development)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-05-11	Common stock	S	2889	$26.7218	Disposed	18626	Direct

Footnotes

F1: $26.7218 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.704 to $26.723, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.