Caribou Biosciences insider sale notice: 6,938 shares

Caribou Biosciences filed a notice relating to the proposed sale of 6,938 common shares tied to the vesting of restricted stock units on 02/20/2026.

Rhea-AI Filing Summary

Caribou Biosciences filed a notice relating to the proposed sale of 6,938 common shares tied to the vesting of restricted stock units on 02/20/2026.

The shares were granted as part of the issuer's equity compensation plan and are reported through a Form 144 filing for proposed resale on the NASDAQ.

Insights

Compensation Analyst

Vested RSUs converted to shares; a Form 144 notifies planned resale.

The filing shows 6,938 common shares tied to the vesting of restricted stock units on 02/20/2026, issued under the company's equity compensation plan. This is an administrative disclosure of intended resale activity.

Cash‑flow treatment and actual sale timing are not provided in the excerpt; subsequent filings or broker reports would state if and when the shares are sold.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filed by CRBU mean?

It notifies a proposed resale of 6,938 common shares tied to vested RSUs on 02/20/2026. The filing signals the holder may sell these vested shares under applicable resale rules; it does not confirm an executed sale or proceeds.

Who receives the proceeds from the sale in the CRBU notice?

The excerpt does not state proceeds recipients beyond indicating these are vested RSU shares. The filing ties the shares to the issuer's equity compensation plan; specific cash‑flow recipients are not disclosed here.

Are the 6,938 shares newly issued or previously outstanding for CRBU?

The filing links the shares to the vesting of restricted stock units, indicating conversion at vesting on 02/20/2026. The excerpt does not state prior outstanding totals or whether these were newly issued or previously reserved.

Does this Form 144 require immediate reporting of the sale for CRBU?

Form 144 is a notice of proposed sale under resale rules and must be filed when applicable. The excerpt shows the notice for 6,938 shares; whether a sale occurred would be reported in subsequent transaction filings or broker records.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 02/25/2026 - 09:42 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001891113
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	CARIBOU BIOSCIENCES, INC.
SEC File Number	001-40631
Address of Issuer	2929 7TH STREET, SUITE 105 BERKELEY CALIFORNIA 94710
Phone	510-982-6030
Name of Person for Whose Account the Securities are To Be Sold	RUHI AHMAD KHAN
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	6938	13598.48	93468038	02/24/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	02/20/2026	Vesting of Restricted Stock Units	Caribou Biosciences, Inc.			6938	02/20/2026	Granted as part of issuer equity compensation plan

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks	Reflects the number of shares of common stock that were sold in a "sell-to-cover" transaction for the sole purpose of satisfying tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person and does not represent a discretionary trade by the reporting person.
Date of Notice	02/25/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/06/2022
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Ruhi Khan
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)