Rachel E. Haurwitz - Jun 8, 2023 Form 4 Insider Report for Caribou Biosciences, Inc. (CRBU)

Signature
/s/ Barbara G. McClung, attorney-in-fact
Stock symbol
CRBU
Transactions as of
Jun 8, 2023
Transactions value $
$29,600
Form type
4
Date filed
6/9/2023, 04:31 PM
Previous filing
Mar 22, 2023
Next filing
Jun 16, 2023

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CRBU Common Stock Options Exercise $29.6K +10K +33.33% $2.96 40K Jun 8, 2023 Direct
holding CRBU Common Stock 3.35M Jun 8, 2023 by Trust 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 -10K -9.4% $0.00 96.4K Jun 8, 2023 Common Stock 10K $2.96 Direct F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Shares are held by The City Canyon Trust Dated May 31, 2021, of which the reporting person is a Co-Trustee with her spouse.
F2 1/4th of the shares subject to this option vested on June 12, 2019 and an additional 1/48th of the aggregate number of shares subject to the option vested on the corresponding day of each month thereafter until the option became fully vested on June 12, 2022.