REPLIGEN CORP — Director's Dealing 2019

May 17, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2019-05-15

Reporting Person: DAWES KAREN A (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-05-15	Common Stock	A	1292	$0.00	Acquired	98329	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2019-05-15	Stock Option (Right to Buy)	$67.71	A	2953	Acquired	2029-05-15	Common Stock (2953)	Direct

Footnotes

F1: Ms. Dawes was awarded 1,292 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 on May 15, 2020. The restricted stock units may be settled only be delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

F2: Award vests in full one year from grant date on May 15, 2020.