REPLIGEN CORP — Director's Dealing 2017

Mar 22, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2017-03-20

Reporting Person: Benjamin Howard (VP Business Development)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-03-20	Common Stock	M	4968	$15.91	Acquired	36124	Direct
2017-03-20	Common Stock	S	4968	$34.6103	Disposed	31156	Direct
2017-03-20	Common Stock	S	7248	$34.6316	Disposed	23908	Direct
2017-03-20	Common Stock	M	10000	$6.23	Acquired	33908	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-03-20	Stock Option (Right to Buy)	$15.91	M	4968	Disposed	2024-02-27	Common Stock (4968)	Direct
2017-03-20	Stock Option (Right to Buy)	$6.23	M	10000	Disposed	2023-02-28	Common Stock (10000)	Direct

Footnotes

F1: $34.6103 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $34.475 to $34.73, 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.

F2: $34.6316 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $34.475 to $34.74, 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: This option is currently exercisable.