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: Snodgres Jon (Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2020-05-13	Common Stock	M	3170	$26.05	Acquired	39297	Direct
2020-05-13	Common Stock	M	9024	$32.40	Acquired	48321	Direct
2020-05-13	Common Stock	S	5358	$126.77	Disposed	42963	Direct
2020-05-13	Common Stock	S	2865	$127.75	Disposed	40098	Direct
2020-05-13	Common Stock	S	1612	$128.70	Disposed	38486	Direct
2020-05-13	Common Stock	S	1700	$130.20	Disposed	36786	Direct
2020-05-13	Common Stock	S	3013	$131.38	Disposed	33773	Direct
2020-05-13	Common Stock	S	846	$132.37	Disposed	32927	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2020-05-13	Stock Option (Right to Buy)	$26.05	M	3170	Disposed	2026-02-26	Common Stock (3170)	Direct
2020-05-13	Stock Option (Right to Buy)	$32.40	M	9024	Disposed	2027-02-23	Common Stock (9024)	Direct

Footnotes

F1: $126.77 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $126.19 to $127.14, 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: $127.75 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $127.27 to $128.24, 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: $128.70 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $128.33 to $129.02, 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: $130.20 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $129.80 to $130.46, 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.

F5: $131.38 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $131.15 to $131.76, 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.

F6: $132.37 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $132.28 to $132.48, 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.

F7: This option is currently exercisable.