REPLIGEN CORP — Director's Dealing 2020

May 15, 2020

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2020-05-13

Reporting Person: KURIYEL RALF (Senior VP, R&D)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2020-05-13	Common Stock	M	6000	$33.05	Acquired	32524	Direct
2020-05-13	Common Stock	M	2000	$33.87	Acquired	34524	Direct
2020-05-13	Common Stock	S	1612	$126.88	Disposed	32912	Direct
2020-05-13	Common Stock	S	6293	$128.02	Disposed	26619	Direct
2020-05-13	Common Stock	S	95	$128.55	Disposed	26524	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2020-05-13	Stock Option (Right to Buy)	$33.05	M	6000	Disposed	2026-12-14	Common Stock (6000)	Direct
2020-05-13	Stock Option (Right to Buy)	$33.87	M	2000	Disposed	2028-03-01	Common Stock (2000)	Direct

Footnotes

F1: $126.88 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $126.36 to $127.33, 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: $128.02 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $127.53 to $128.52, 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: $128.55 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $128.54 to $128.61, 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.

F4: 6,000 of the shares underlying this option have vested. The remaining 4,000 shares shall vest in two equal installments on December 14, 2020 and December 14, 2021.

F5: 8,566 of the shares underlying this option have vested. The remaining 4,284 shares shall vest on March 1, 2021.