Castle Biosciences director awarded 11,766 RSUs

Cotton Rodney reported acquisition or exercise transactions in this Form 4 filing.

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Form Type

Rhea-AI Filing Summary

Cotton Rodney reported acquisition or exercise transactions in this Form 4 filing.

Castle Biosciences director Rodney Cotton received a grant of 11,766 Restricted Stock Units. Each RSU represents the right to receive one share of Castle Biosciences common stock. The RSUs vest in full on the earlier of May 28, 2027, or the day immediately before the next annual meeting of stockholders following the grant date.

Insider Trade Summary

Grant/Award: 11,766 shares

Grant/Award 1 txn

Insider Cotton Rodney

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	11,766	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 11,766 contracts (Direct)

Footnotes (2)

F1. Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock.
F2. The RSUs vest in full on the earlier of the (a) one-year anniversary of the date on May 28, 2027, or (b) the day immediately preceding the next Annual Meeting of Stockholders following the date of the grant.

Key Figures

RSU grant size: 11,766 units Shares per RSU: 1 share per unit Grant price: $0.0000 per unit +2 more

5 metrics

RSU grant size 11,766 units Restricted Stock Units granted to director Rodney Cotton

Shares per RSU 1 share per unit Each RSU equals one share of common stock

Grant price $0.0000 per unit Compensation award, no purchase price paid

Units after grant 11,766 units Total RSUs held by Cotton following this transaction

Vesting date trigger May 28, 2027 Full vest or earlier day before next annual meeting

Key Terms

Restricted Stock Units, RSU, Annual Meeting of Stockholders, transaction code A

4 terms

Restricted Stock Units financial

"Each Restricted Stock Unit ("RSU") represents the right to receive one share"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

RSU financial

"Each Restricted Stock Unit ("RSU") represents the right to receive one share"

Restricted stock units (RSUs) are a form of company shares given to employees as part of their compensation, usually with certain restrictions or conditions, such as remaining with the company for a set period. When these restrictions lift, employees receive actual shares that they can sell or hold. For investors, RSUs can impact a company's stock supply and reflect the company's commitment to attracting and retaining talent.

Annual Meeting of Stockholders financial

"the day immediately preceding the next Annual Meeting of Stockholders following the date of the grant"

transaction code A financial

"transaction_code_description": "Grant, award, or other acquisition""

FAQ

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

What did Castle Biosciences (CSTL) director Rodney Cotton report on this Form 4?

Rodney Cotton reported receiving 11,766 Restricted Stock Units as a compensation grant. These RSUs are a right to receive common shares in the future, subject to vesting conditions tied to time and the next annual stockholder meeting.

How many Restricted Stock Units did Rodney Cotton receive from Castle Biosciences (CSTL)?

He received 11,766 Restricted Stock Units. Each RSU corresponds to one share of Castle Biosciences common stock, so the award represents up to 11,766 shares if all vesting conditions are satisfied in the future.

When do Rodney Cotton’s Castle Biosciences (CSTL) RSUs vest?

The RSUs vest in full on the earlier of May 28, 2027, or the day immediately preceding the next Annual Meeting of Stockholders. This time-based vesting schedule links the award to Cotton’s continued board service.

What does each Restricted Stock Unit represent in the Castle Biosciences (CSTL) grant?

Each Restricted Stock Unit represents the right to receive one share of Castle Biosciences common stock. Shares are not issued immediately; they are delivered only if vesting requirements are met under the award terms.

Is Rodney Cotton’s Castle Biosciences (CSTL) RSU grant an open-market purchase or a compensation award?

It is a compensation award, not an open-market purchase. The Form 4 uses transaction code “A” for a grant or award acquisition, with no price paid per unit, indicating equity-based director compensation.

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Accepted by SEC EDGAR 06/01/2026 - 04:47 PM EDT

SEC Form 4

FORM 4

UNITED 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).

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^*

Cotton Rodney

(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)

X	Director	10% Owner
	Officer (give title below)	Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/28/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form 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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	⁽¹⁾	05/28/2026		A		11,766		⁽²⁾	⁽²⁾	Common Stock	11,766	$0	11,766	D

Explanation of Responses:

1. Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock.

2. The RSUs vest in full on the earlier of the (a) one-year anniversary of the date on May 28, 2027, or (b) the day immediately preceding the next Annual Meeting of Stockholders following the date of the grant.

Remarks:

	/s/ Frank Stokes, Attorney-in-fact	06/01/2026
	** Signature of Reporting Person	Date
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)

Source: View Original Filing on SEC EDGAR