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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1619856	Caribou Biosciences Inc.	CRBU	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1231321	G Barbara Mcclung	2929 7Th Street, Suite 105 Berkeley CA 94710	Chief Legal 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	2021-12-07	12	$2.69	342,856	No	4	P	Direct
Common Stock	Acquisiton	2021-12-07	6,115	$2.69	348,971	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Direct
No	4	P	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	2021-12-07	12	$0.00	12	$2.69
Common Stock	Option to purchase Common Stock	Disposition	2021-12-07	6,115	$0.00	6,115	$2.69

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
77		2028-06-11	No	4	X	Direct
74,836		2029-09-30	No	4	X	Direct

Footnotes

These shares were acquired pursuant to the exercise of a stock option, as reported in Table II below.
The exercise price for this stock option was incorrectly reported as $2.68 per share on the reporting person's Form 3 filed on July 22, 2021.
The shares subject to this option have vested or will vest in equal monthly installments until the option is fully vested on June 12, 2022, subject to the reporting person's continued service to the Issuer through the applicable vesting dates.
The shares subject to this option have vested or will vest in equal monthly installments until the option is fully vested on October 1, 2023, subject to the reporting person's continued service to the Issuer through the applicable vesting dates.