Form 4 for RGEN REPLIGEN CORP

Accepted 2026-05-18 16:05:04 ET · period of report 2026-05-14 · accession 0001193125-26-228891 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
D	2026-05-18 16:05	2026-05-14	RGEN	MUIR GLENN P	Dir	A - Grant	$0.00	+995	40.1K	+3%	$0
D	2026-05-18 16:05	2026-05-14	RGEN	MUIR GLENN P	Dir	A - Grant	$0.00	+2,239	2,239	New	$0

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2026-05-14	A	A	995	$0.00	40,051	D	—	—	(F1) Mr. Muir was awarded 995 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 the earlier of May 14, 2027, one year from the grant date, or the date of the next annual meeting of the Company's shareholders, which has not yet been determined. The Reporting Person has elected to defer settlement of these restricted stock units pursuant to the Repligen Corporation Deferred Compensation Plan for Non-Employee Directors. Once vested, the shares will be issued in accordance with the Reporting Person's deferral election following the separation of the Reporting Person's service as a Director. 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.
2	Derivative	Stock Option (Right to Buy)	2026-05-14	A	A	2,239	$0.00	2,239	D	$103.38 · 2027-05-14 to 2036-05-14	2,239 Common Stock	(F2) Award vests in full on the earlier of May 14, 2027, one year from grant date, or on the date of the next annual meeting of the Company's shareholders, which has not yet been determined.