Syed Ali-aamir Rizvi - Jan 25, 2022 Form 4 Insider Report for Caribou Biosciences, Inc. (CRBU)

Role: Chief Medical Officer
Signature: /s/ Barbara G. McClung, as attorney-in-fact
Stock symbol: CRBU
Transactions as of: Jan 25, 2022
Transactions value $: $0
Form type: 4
Date filed: 1/25/2022, 06:56 PM
Previous filing: Jan 24, 2022
Next filing: Jan 20, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CRBU	Common stock	Award	$0	+60K	+1200%	$0.00	65K	Jan 25, 2022	Direct	F1

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	Award	$0	+161K		$0.00	161K	Jan 25, 2022	Common stock	161K	$10.64	Direct	F2

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

Explanation of Responses:

Id	Content
F1	This reflects restricted stock units ("RSUs") that vest in four equal annual installments beginning on January 18, 2023, subject to the reporting person's continued services to the Issuer through the applicable vesting dates. The RSUs will be settled in stock within 30 days after each vesting date.
F2	1/4th of the shares subject to this option will vest on January 18, 2023 and an additional 1/48th of the aggregate number of shares subject to the option 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.