Caribou Biosciences, Inc. — Director's Dealing 2021

Oct 12, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Caribou Biosciences, Inc. (CRBU)
CIK: 0001619856
Period of Report: 2021-10-11

Reporting Person: Fischesser Ryan (VP of Finance and Controller)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-10-11	Common Stock	P	1746	$2.69	Acquired	100559	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-10-11	Option to purchase Common Stock	$2.69	X	1746	Disposed	2029-03-18	Common Stock (1746)	Direct

Footnotes

F1: These shares were acquired pursuant to the exercise of a stock option, as reported in Table II below.

F2: 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 23, 2021.

F3: The shares subject to this option have vested or will vest in equal monthly installments until the option is fully vested on January 1, 2023, subject to the reporting person's continued service to the Issuer through the applicable vesting dates.