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: Hunt Anthony (Chief Executive Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-02-23	Common Stock	A	32488	$0.00	Acquired	100830	Direct
2017-03-01	Common Stock	F	5972	$32.0704	Disposed	94858	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	64975	Acquired	2027-02-23	Common Stock (64975)	Direct

Footnotes

F1: Mr. Hunt was awarded 32,488 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 5,972 shares of Common Stock valued at a weighted average price of $32.0704 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.