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Castle Biosciences (CSTL) CCO sells 1,301 shares at $38.39

(Neutral)
(Negative)
Form Type
4

Rhea-AI Filing Summary

Castle Biosciences Inc Chief Commercial Officer Juvenal Tobin W reported selling 1,301 shares of common stock on 2025-11-24 at $38.39 per share in an open-market or private transaction. Following the sale, he directly holds 77,694 shares. The trade was executed under a Rule 10b5-1 plan adopted on September 11, 2024.

Positive

  • None.

Negative

  • None.
Insider Juvenal Tobin W
Role Chief Commercial Officer
Sold 1,301 shs ($50K)
Type Security Shares Price Value
Sale Common Stock F1 1,301 $38.39 $50K
Holdings After Transaction: Common Stock — 77,694 shares (Direct)
Footnotes (1)
  1. F1. This transaction was made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on September 11, 2024.
Shares sold 1,301 shares Common stock sale on 2025-11-24 by Chief Commercial Officer
Sale price per share $38.39 Per-share price for the 1,301 Castle Biosciences shares sold
Shares held after transaction 77,694 shares Direct holdings of Juvenal Tobin W following the reported sale
Net shares sold in filing 1,301 shares Net-sell direction per transaction summary for this Form 4
Rule 10b5-1 plan regulatory
"This transaction was made pursuant to a Rule 10b5-1 plan"
A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.
open market or private transaction financial
"Transaction code describes a sale in open market or private transaction"
Chief Commercial Officer other
"Reporting person serves as Chief Commercial Officer of the issuer"
A chief commercial officer (CCO) is the senior executive responsible for a company’s revenue-generating activities, including sales, marketing, pricing, customer relationships and business development. Think of the CCO as the head coach who builds the game plan to win customers and grow sales; their effectiveness affects how fast a company earns money, enters new markets and sustains profits, making the role a key signal for investors about future revenue and competitive strength.

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

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FAQ

What insider transaction did CSTL report for Juvenal Tobin W?

Castle Biosciences Inc (CSTL) reported that Chief Commercial Officer Juvenal Tobin W sold 1,301 shares of common stock. The sale occurred on 2025-11-24 in an open-market or private transaction at $38.39 per share under a Rule 10b5-1 plan.

At what price were the CSTL shares sold in this Form 4 filing?

The reported CSTL transaction was executed at an average price of $38.39 per share. It involved the sale of 1,301 Castle Biosciences common shares in an open-market or private transaction disclosed by Chief Commercial Officer Juvenal Tobin W.

How many CSTL shares does Juvenal Tobin W hold after the sale?

After the reported sale, Juvenal Tobin W directly holds 77,694 Castle Biosciences (CSTL) common shares. This post-transaction holding reflects the position remaining following the disposition of 1,301 shares reported in the latest Form 4 filing.

Was the CSTL insider sale made under a Rule 10b5-1 plan?

Yes. The sale of 1,301 Castle Biosciences (CSTL) shares was made pursuant to a Rule 10b5-1 plan. The plan was adopted by the reporting person on September 11, 2024, indicating the trades were pre-arranged rather than discretionary.

Who is the insider involved in this CSTL Form 4 and what is his role?

The insider is Juvenal Tobin W, who serves as Chief Commercial Officer of Castle Biosciences Inc (CSTL). He reported a sale of 1,301 common shares and now directly owns 77,694 shares, according to the Form 4 data.

How many CSTL shares were sold in total in this reported transaction?

The reported Castle Biosciences (CSTL) Form 4 shows a total sale of 1,301 common shares. This single open-market or private transaction is classified as a sale and resulted in post-transaction direct holdings of 77,694 shares for the reporting officer.
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
X
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Juvenal Tobin W

(Last)(First)(Middle)
C/O CASTLE BIOSCIENCES, INC.
1500 W. PARKWOOD AVE SUITE 400

(Street)
FRIENDSWOOD TEXAS 77546

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
CASTLE BIOSCIENCES INC [ CSTL ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Commercial Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
11/24/2025
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock11/24/2025S(1)1,301D$38.3977,694D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. This transaction was made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on September 11, 2024.
Remarks:
/s/ Frank Stokes, Attorney-in-fact08/06/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)