Timothy P. Kelly - 08 Jan 2024 Form 4 Insider Report for Caribou Biosciences, Inc. (CRBU)

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	+300,000		$0.000000	300,000	08 Jan 2024	Common Stock	300,000	$5.74	Direct	F1

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

Id	Content
F1	25% of the shares subject to the option shall vest on January 1, 2025, and the remaining shares subject to the option shall vest monthly thereafter (1/48 of the shares per month for the 36 months following the one-year cliff), subject to the Reporting Person's continued service to the Issuer through the applicable vesting dates.