Steven Kanner - Aug 25, 2022 Form 4 Insider Report for Caribou Biosciences, Inc. (CRBU)

Role: Chief Scientific Officer
Signature: /s/ Barbara G. McClung, as attorney-in-fact
Stock symbol: CRBU
Transactions as of: Aug 25, 2022
Transactions value $: -$368,884
Form type: 4
Date filed: 8/26/2022, 05:42 PM
Previous filing: May 17, 2022
Next filing: Dec 2, 2022

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CRBU	Common Stock	Options Exercise	$116K	+43.2K	+14.32%	$2.69	345K	Aug 25, 2022	Direct
transaction	CRBU	Common Stock	Sale	-$485K	-43.2K	-12.52%	$11.22	302K	Aug 25, 2022	Direct	F1, F2

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	$0	-43.2K	-37.01%	$0.00	73.6K	Aug 25, 2022	Common Stock	43.2K	$2.69	Direct	F3

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

Explanation of Responses:

Id	Content
F1	The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 24, 2022.
F2	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.88 to $11.37, inclusive. The reporting person undertakes to provide to Caribou Biosciences, Inc., any security holder of Caribou Biosciences, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.
F3	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.