REPLIGEN CORP — Director's Dealing 2017

Mar 2, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

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

Reporting Person: Benjamin Howard (VP Business Development)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-02-23	Common Stock	A	4506	—	Acquired	33132	Direct
2017-03-01	Common Stock	F	1976	$32.0786	Disposed	31156	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-02-23	Stock Option (Right to Buy)	$32.32	A	9012	Acquired	2027-02-23	Common Stock (9012)	Direct

Footnotes

F1: Mr. Benjamin was awarded 4,506 Restricted Stock Units. Each Restricted Stock Unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The Restricted Stock Units vest in equal annual installments over a three-year period beginning on the first anniversary of the grant date. The Restricted Stock Units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

F2: Payment of tax liability made via forfeiture of 1,976 shares of Common Stock valued at a weighted average of $32.0786 per share on March 1, 2017.

F3: The shares vest in equal annual installments over a three-year period beginning on the first anniversary of the grant date.