REPLIGEN CORP — Director's Dealing 2025

Mar 4, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2025-03-03

Reporting Person: Loeillot Olivier (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-03-03	Common Stock	A	14480	—	Acquired	46693	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-03-03	Stock Option (Right to Buy)	$155.38	A	13627	Acquired	2035-03-03	Common Stock (13627)	Direct

Footnotes

F1: Mr. Loeillot was awarded 14,480 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: One third of the stock options will vest and become exercisable annually on March 3, 2026, March 3, 2027, and March 3, 2028.