Steven Kanner - May 13, 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
May 13, 2022
Transactions value $
$140,081
Form type
4
Date filed
5/17/2022, 08:51 PM
Previous filing
Mar 7, 2022
Next filing
Aug 26, 2022

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CRBU Common Stock Options Exercise $124K +68.3K +30.01% $1.81 296K May 13, 2022 Direct
transaction CRBU Common Stock Options Exercise $16.4K +6.11K +2.07% $2.69 302K May 13, 2022 Direct F1

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 -68.3K -95.08% $0.00 3.53K May 13, 2022 Common Stock 68.3K $1.81 Direct F2
transaction CRBU Option to purchase Common Stock Options Exercise $0 -6.11K -4.97% $0.00 117K May 13, 2022 Common Stock 6.11K $2.69 Direct F1, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Due to a rounding error, the exercise price for this stock option was inadvertently originally reported as $2.68 per share on the reporting person's Form 3 filed on July 22, 2021.
F2 1/4th of the shares subject to this option vested on June 30, 2018 and an additional 1/48th of the aggregate number of shares subject to the option vested on the corresponding day of each month thereafter (or the last day of the month, if there was no corresponding day of the month), subject to the reporting person's continued services to the Issuer through the applicable vesting dates.
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.