REPLIGEN CORP — Director's Dealing 2017

May 22, 2017

SEC Form 4/A — Form 4/A

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2017-02-23

Reporting Person: Snodgres Jon (Chief Financial Officer)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-02-23	Stock Option (Right to Buy)	$32.40	A	18165	Acquired	2027-02-23	Common Stock (18165)	Direct

Footnotes

F1: The shares vest in equal annual installments over a three-year period beginning on the first anniversary of the grant date.