Form 4 for CRBP Corbus Pharmaceuticals Holdings, Inc.

Accepted 2026-05-21 17:04:18 ET · period of report 2026-05-19 · accession 0001193125-26-234813 · 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	2026-05-21 17:04	2026-05-19	CRBP	Pfeiffenberger Brent	Dir	A - Grant	$0.00	+7,500	7,500	New	$0
D	2026-05-21 17:04	2026-05-19	CRBP	Pfeiffenberger Brent	Dir	A - Grant	$0.00	+24.7K	24.7K	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, par value $0.0001 per share	2026-05-19	A	A	7,500	$0.00	7,500	D	—	—	(F1) On May 19, 2026, 7,500 restricted stock units ("RSUs") were granted, which will be settled in shares of common stock, par value $0.0001. The RSUs will vest in three equal annual installments on each of the first three anniversaries of the grant date, subject to continued service to the Company through each applicable vesting date. (F2) This amount includes 7,500 unvested RSUs that were granted on May 19, 2026 and will vest in three equal annual installments on each of the first three anniversaries of the grant date, subject to continued service to the Company through each applicable vesting date.
2	Derivative	Stock options (right to buy)	2026-05-19	A	A	24,700	$0.00	24,700	D	$9.15 · — to 2036-05-19	24,700 Common Stock	(F3) The option award was made in accordance with the terms of the issuer's 2024 Equity Compensation Plan. The option will vest in three equal annual installments on each of the first three anniversaries of the grant date, subject to continued service to the Company through each applicable vesting date.