Steven Kanner - 02 Dec 2022 Form 4 Insider Report for Caribou Biosciences, Inc. (CRBU)

Role: Chief Scientific Officer
Signature: /s/ Barbara G. McClung, as attorney-in-fact
Issuer symbol: CRBU
Transactions as of: 02 Dec 2022
Net transactions value: $0
Form type: 4
Filing time: 02 Dec 2022, 18:01:25 UTC
Previous filing: 26 Aug 2022
Next filing: 23 Feb 2023
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CRBU	Common Stock	Options Exercise	$57,569	+21,401	+7.1%	$2.69	323,460	02 Dec 2022	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	CRBU	Option to purchase Common Stock	Options Exercise	$57,569	-21,401	-29%	$2.69	52,200	02 Dec 2022	Common Stock	21,401	$2.69	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	1/4th of the shares subject to this option vested on October 1, 2020 and an additional 1/48th of the aggregate number of shares subject to the option have vested or will vest on the corresponding day of each month thereafter, subject to the reporting person's continued services to the Issuer through the applicable vesting dates.