Form 4 for CRBU Caribou Biosciences, Inc.

Accepted 2021-12-21 00:00:00 ET · period of report 2021-12-20 · accession 0001209191-21-070797 · 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	2021-12-21	2021-12-20	CRBU	Fischesser Ryan	VP of Fin, Ctrl	P - Purchase	$2.69	+1,136	101.7K	+1%	+$3,056
D	2021-12-21	2021-12-20	CRBU	Fischesser Ryan	VP of Fin, Ctrl	A - Grant	$0.00	+40.0K	40.0K	New	$0
D	2021-12-21	2021-12-20	CRBU	Fischesser Ryan	VP of Fin, Ctrl	X - OptEx	$0.00	-1,136	7,384	-13%	$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	2021-12-20	P	A	1,136	$2.69	101,695	D	—	—	(F2) The exercise price for this stock option was incorrectly reported as $2.68 per share on the reporting person's Form 3 filed on July 23, 2021.
2	Derivative	Option to purchase Common Stock	2021-12-20	A	A	40,000	$0.00	40,000	D	$15.16 · — to 2031-12-19	40,000 Common Stock	(F4) The shares subject to this option will vest in equal monthly installments starting on the first monthly anniversary of the grant date until the option is fully vested on December 20, 2025, subject to the reporting person's continued service to the Issuer through the applicable vesting dates.
3	Derivative	Option to purchase Common Stock	2021-12-20	X	D	1,136	$0.00	7,384	D	$2.69 · — to 2029-03-18	1,136 Common Stock	(F2) The exercise price for this stock option was incorrectly reported as $2.68 per share on the reporting person's Form 3 filed on July 23, 2021. (F3) The shares subject to this option have vested or will vest in equal monthly installments until the option is fully vested on January 1, 2023, subject to the reporting person's continued service to the Issuer through the applicable vesting dates.