REPLIGEN CORP — Director's Dealing 2023

Mar 6, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2023-03-02

Reporting Person: Gebski Christine (See Remarks)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2023-03-02	Common Stock	A	3467	$0.00	Acquired	32660	Direct
2023-03-03	Common Stock	A	375	$0.00	Acquired	33035	Direct
2023-03-03	Common Stock	F	126	$188.00	Disposed	32909	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-03-02	Stock Option (Right to Buy)	$180.48	A	3590	Acquired	2033-03-02	Common Stock (3590)	Direct

Footnotes

F1: Ms. Gebski was awarded 3,467 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 instalments 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: Represents shares issued pursuant to a Performance Stock Unit ("PSU") award granted to the Issuer on January 1, 2022. The Compensation Committee authorized the issuance of the underlying shares based upon the Issuer's achievement of pre-established performance criteria set forth in the PSU award.

F3: Represents the number of shares withheld by the Issuer to satisfy tax withholding obligations of the reporting person that arose upon the settlement of the PSUs.

F4: One third of the stock options will vest and become exercisable annually on March 2, 2024, March 2, 2025, and March 2, 2026.