REPLIGEN CORP — Director's Dealing 2018

Mar 6, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2018-03-01

Reporting Person: Hunt Anthony (Director, Chief Executive Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-03-01	Common Stock	A	38382	$0.00	Acquired	113170	Direct
2018-03-01	Common Stock	A	147623	$0.00	Acquired	260793	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-03-01	Stock Option (Right to Buy)	$33.87	A	74246	Acquired	2028-03-01	Common Stock (74246)	Direct
2018-03-01	Stock Option (Right to Buy)	$33.87	A	285563	Acquired	2028-03-01	Common Stock (285563)	Direct

Footnotes

F1: Mr. Hunt was awarded 38,382 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: Mr. Hunt was awarded 147,623 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 nine-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.

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

F4: The shares vest in equal annual installments over a nine-year period beginning on the first anniversary of the grant date.