Castle Biosciences officer lists $112K share sale

Available on EDGAR 11/12/2026 - 08:31 AM EST Accepted by SEC EDGAR 11/12/2026 - 08:30 AM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Tobin Juvenal, an officer of Castle Biosciences (CSTL), lists 3,195 common shares to be sold, with an approximate sale date of November 11, 2026, and an aggregate market value of $112,032.68. The securities table records those shares as acquired from the issuer through a cash-paid stock option exercise on November 11. The remarks say sales executed that day were reported November 12 because EDGAR was not accepting filings in observance of the federal holiday. The past-three-months table lists a November 9 sale of 13,154 shares for gross proceeds of $452,234.52.

Key Figures

Shares reported for sale: 3,195 common shares Aggregate Market Value: $112,032.68 Shares sold: 13,154 common shares +3 more

6 metrics

Shares reported for sale 3,195 common shares Approximate sale date: November 11, 2026

Aggregate Market Value $112,032.68 Shares reported for sale

Shares sold 13,154 common shares Sale dated November 9, 2026

Gross Proceeds $452,234.52 Sale dated November 9, 2026

Shares sold 6,578 common shares Sale dated October 28, 2026

Gross Proceeds $239,590.83 Sale dated October 28, 2026

Key Terms

Aggregate Market Value, Stock Option Exercise, Gross Proceeds, Approximate Date of Sale

4 terms

Aggregate Market Value financial

"Aggregate Market Value"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

Stock Option Exercise financial

"Nature of Acquisition Transaction | Stock Option Exercise"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

Gross Proceeds financial

"Gross Proceeds"

The total amount of cash a company receives from a financing event or sale before any fees, expenses, taxes or deductions are taken out. Investors watch gross proceeds because it shows the raw scale of new capital being raised—think of it as the paycheck amount before withholdings—which helps assess how much funding is available for operations, growth, debt payoff or how much shareholder dilution might occur once costs are removed.

Approximate Date of Sale financial

"Approximate Date of Sale"

FAQ

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

How many CSTL shares did Tobin Juvenal report for sale?

Tobin Juvenal reported 3,195 common shares for sale, with an approximate sale date of November 11, 2026, and an aggregate market value of $112,032.68. The remarks say sales executed that day were reported November 12 because EDGAR was not accepting filings in observance of the federal holiday.

How did Tobin Juvenal acquire the CSTL shares?

The securities table records the 3,195 common shares as acquired from the issuer through a stock option exercise on November 11, 2026, with cash listed as the payment method.

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

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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	0001856542
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	866-788-9007
Name of Person for Whose Account the Securities are To Be Sold	TOBIN JUVENAL
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	3195	112032.68	30818291	11/11/2026	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	11/11/2026	Stock Option Exercise	Issuer			3195	11/11/2026	Cash

* 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
TOBIN JUVENAL 1500 W. Parkwood Ave, Suite 400 Friendswood TX 77546	Common	11/09/2026	13154	452234.52
TOBIN JUVENAL 1500 W. Parkwood Ave, Suite 400 Friendswood TX 77546	Common	10/28/2026	6578	239590.83
TOBIN JUVENAL 1500 W. Parkwood Ave, Suite 400 Friendswood TX 77546	Common	10/26/2026	3288	108767.04
TOBIN JUVENAL 1500 W. Parkwood Ave, Suite 400 Friendswood TX 77546	Common	10/12/2026	3288	110608.32
TOBIN JUVENAL 1500 W. Parkwood Ave, Suite 400 Friendswood TX 77546	Common	09/30/2026	1034	35362.80
TOBIN JUVENAL 1500 W. Parkwood Ave, Suite 400 Friendswood TX 77546	Common	09/29/2026	5543	196765.41
TOBIN JUVENAL 1500 W. Parkwood Ave, Suite 400 Friendswood TX 77546	Common	09/15/2026	3294	115757.75
TOBIN JUVENAL 1500 W. Parkwood Ave, Suite 400 Friendswood TX 77546	Common	09/14/2026	3306	106863.14
TOBIN JUVENAL 1500 W. Parkwood Ave, Suite 400 Friendswood TX 77546	Common	08/31/2026	1730	56761.30
TOBIN JUVENAL 1500 W. Parkwood Ave, Suite 400 Friendswood TX 77546	Common	08/25/2026	9050	317112.00
TOBIN JUVENAL 1500 W. Parkwood Ave, Suite 400 Friendswood TX 77546	Common	08/17/2026	1730	51190.70

144: Remarks and Signature

Remarks	Sales that were executed on November 11, 2026 are being reported on this Form 144 filed on November 12, 2026 given the EDGAR system was not accepting filings on November 11, 2026 in observance of the federal holiday.
Date of Notice	11/12/2026
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/ Tobin Juvenal
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)