REPLIGEN CORP — Director's Dealing 2018

Jan 24, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2018-01-22

Reporting Person: Hunt Anthony (Director, Chief Executive Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-01-22	Common Stock	S	8970	$35.947	Disposed	83613	Direct

Footnotes

F1: Sale of common stock was effected pursuant to a 10(b)5-1 trading plan adopted on November 17, 2017.

F2: $35.947 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $35.58 to $36.28, 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.