Form 4 for RGEN REPLIGEN CORP

Accepted 2026-01-12 00:00:00 ET · period of report 2025-12-31 · accession 0001193125-26-010470 · 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	2026-01-12	2025-12-31	RGEN	Douglass Brian Robb	Chief PRODUCT Off	A - Grant	$0.00	+2,288	8,540	+37%	$0
D	2026-01-12	2025-12-31	RGEN	Douglass Brian Robb	Chief PRODUCT Off	A - Grant	$0.00	+2,143	2,143	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	2025-12-31	A	A	2,288	$0.00	8,540	D	—	—	(F1) Mr. Douglass was awarded 2,288 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 substantially 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.
2	Derivative	Stock Option (Right to Buy)	2025-12-31	A	A	2,143	$0.00	2,143	D	$163.86 · — to 2035-12-31	2,143 Common Stock	(F2) The shares will vest in substantially equal installments over a three-year period with each such vesting date occurring on the anniversary of the grant date.