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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1619856	Caribou Biosciences Inc.	CRBU	Biological Products, (No Disgnostic Substances) (2836)	453728228

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1871131	Steven Kanner	C/O Caribou Biosciences, Inc. 2929 7Th Street, Suite 105 Berkeley CA 94710	Chief Scientific Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2022-08-25	43,248	$2.69	345,307	No	4	M	Direct
Common Stock	Disposition	2022-08-25	43,248	$11.22	302,059	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Option to purchase Common Stock	Disposition	2022-08-25	43,248	$0.00	43,248	$2.69

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
73,601		2029-09-30	No	4	M	Direct

Footnotes

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.
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.
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.