REPLIGEN CORP — Director's Dealing 2019

May 28, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2019-05-23

Reporting Person: COOPER GLENN L MD (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-05-23	Common Stock	S	4734	$66.91	Disposed	35975	Direct
2019-05-23	Common Stock	S	266	$67.53	Disposed	35709	Direct

Footnotes

F1: Sale of common stock to cover the exercise price and a portion of the tax liability resulting from the exercise of Mr. Cooper's 24,000 stock options was allowed pursuant to an exception to a lock-up agreement, signed by Mr. Cooper on April 26, 2019 in connection with the public offering of the Company's common stock.

F2: $66.91 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $66.42 to $67.36, 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.

F3: $67.53 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $67.52 to $67.57, 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.