Form 144: 7,000 CSTL RSU Shares Listed for Sale

Morgan Stanley Smith Barney LLC Executive Financial Services filed a Form 144 reporting an intended sale of 7,000 common shares originally issued as Restricted Stock Units on 12/09/2023.

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC Executive Financial Services filed a Form 144 reporting an intended sale of 7,000 common shares originally issued as Restricted Stock Units on 12/09/2023. The filing lists a prior sale of 4,496 common shares on 12/11/2025 for $168,375.20.

The filing identifies the securities as common stock of CSTL and provides broker details and a filing date of 03/03/2026 in the header. This is a routine notice of an affiliate sale under resale reporting rules.

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Equity Compliance Analyst

Routine resale filing by an affiliate reporting 7,000 RSU-related shares to be sold.

The notice lists 7,000 common shares tied to Restricted Stock Units granted on 12/09/2023 and reports a prior disposition of 4,496 shares on 12/11/2025 for $168,375.20. The broker is identified as Morgan Stanley Smith Barney LLC Executive Financial Services.

Cash‑flow treatment and specific distribution methods are not detailed in the excerpt; subsequent filings or broker reports may specify execution method and timing.

FAQ

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

What does the CSTL Form 144 filed by Morgan Stanley report?

The Form 144 reports an intended sale of 7,000 common shares issued as Restricted Stock Units on 12/09/2023. It also shows a prior sale of 4,496 shares on 12/11/2025 for $168,375.20.

Who is listed as the broker or dealer on the CSTL Form 144?

The filing lists Morgan Stanley Smith Barney LLC Executive Financial Services at 1 New York Plaza, New York, NY. The broker entry appears in the filer information section of the Form 144 header provided in the excerpt.

How many CSTL shares were sold in the prior three months according to the filing?

The excerpt shows 4,496 common shares sold on 12/11/2025 with total proceeds of $168,375.20. That sale is listed in the "Securities Sold During The Past 3 Months" section.

Are the shares described in the CSTL Form 144 restricted or unrestricted?

The filing identifies the securities to be sold as Common shares tied to Restricted Stock Units granted on 12/09/2023. The entry in the securities section explicitly labels them as Restricted Stock Units.

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

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Accepted by SEC EDGAR 03/03/2026 - 04:33 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	0001782815
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	CASTLE BIOSCIENCES INC
SEC File Number	001-38984
Address of Issuer	1500 W. Parkwood Ave, Suite 400 Friendswood TEXAS 77546
Phone	8667889007
Name of Person for Whose Account the Securities are To Be Sold	FRANKLIN STOKES
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	7000	195930.00	29731198	03/03/2026	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	12/09/2023	Restricted Stock Units	Issuer			7000	12/09/2023	N/A

* 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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
FRANKLIN STOKES 1500 W. Parkwood Ave, Suite 400 Friendswood TX 77546	Common	12/11/2025	4496	168375.20

144: Remarks and Signature

Remarks
Date of Notice	03/03/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/13/2025
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/ Franklin Stokes
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)