Castle Biosciences director exercises 13,667 RSUs

Castle Biosciences director Daniel Bradbury reported routine equity compensation activity.

Rhea-AI Filing Summary

Castle Biosciences director Daniel Bradbury reported routine equity compensation activity. He exercised 13,667 Restricted Stock Units, receiving the same number of shares of Common Stock at a stated price of $0.00 per share.

Following the transactions, he now holds 22,340 shares of Common Stock directly and 13,291 shares indirectly through the Bradbury Family Trust, where he and Annette Bradbury serve as trustees and beneficiaries.

Insider Trade Summary

13,667 shares exercised/converted

Exercise 3 txns

Insider BRADBURY DANIEL

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	13,667	$0.00	$0.00
Exercise	Common Stock	13,667	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Units — 0 contracts (Direct); Common Stock — 22,340 shares (Direct); Common Stock — 13,291 shares (Indirect, The Bradbury Family Trust)

Footnotes (3)

1. F1. Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock.
2. F2. Held by Bradbury Family Trust of which the Reporting Person and Annette Bradbury are the trustees and the beneficiaries.
3. F3. The RSUs vest in full on the earlier of the (a) one-year anniversary of the date on May 22, 2026, or (b) the day immediately preceding the next Annual Meeting of Stockholders following the date of the grant.

Key Figures

RSUs exercised: 13,667 shares Exercise price: $0.00 per share Direct holdings after transaction: 22,340 shares +1 more

4 metrics

RSUs exercised 13,667 shares Restricted Stock Units converted to Common Stock on May 22, 2026

Exercise price $0.00 per share Stated transaction price for RSU conversion

Direct holdings after transaction 22,340 shares Common Stock held directly following RSU exercise

Indirect holdings via trust 13,291 shares Common Stock held by Bradbury Family Trust

Key Terms

Restricted Stock Units, derivative security, Bradbury Family Trust

3 terms

Restricted Stock Units financial

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

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.

derivative security financial

"transaction_code_description: "Exercise or conversion of derivative security""

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

Bradbury Family Trust financial

"Held by Bradbury Family Trust of which the Reporting Person and Annette Bradbury are the trustees and the beneficiaries."

FAQ

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

What did Daniel Bradbury report in this Form 4 for CSTL?

Daniel Bradbury reported an exercise of equity awards. He converted 13,667 Restricted Stock Units into 13,667 shares of Castle Biosciences Common Stock, with no reported open-market buying or selling activity in this filing.

How many Castle Biosciences (CSTL) shares does Daniel Bradbury hold after the transactions?

After the transactions, Daniel Bradbury holds 35,631 shares in total. This includes 22,340 shares of Common Stock held directly and 13,291 shares held indirectly through the Bradbury Family Trust associated with him.

What type of security did Daniel Bradbury exercise in this CSTL filing?

He exercised Restricted Stock Units (RSUs). The filing shows 13,667 RSUs converted into 13,667 shares of Castle Biosciences Common Stock, with each RSU representing the right to receive one share of Common Stock upon settlement.

Did Daniel Bradbury buy or sell Castle Biosciences (CSTL) shares on the market?

The filing does not show any open-market purchases or sales. It records a derivative exercise of 13,667 RSUs into Common Stock and an updated indirect holding entry, without any reported market buy or sell transactions.

What is the role of the Bradbury Family Trust in Daniel Bradbury’s CSTL holdings?

The Bradbury Family Trust holds CSTL shares indirectly for Daniel Bradbury. The filing states 13,291 Common Stock shares are held by this trust, where Daniel and Annette Bradbury are both trustees and beneficiaries.

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

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Accepted by SEC EDGAR 05/27/2026 - 04:18 PM EDT Learn about SEC filing dates

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^*

BRADBURY DANIEL

(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)
05/22/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/22/2026		M		13,667	A	(1)	22,340	D
Common Stock								13,291	I	The Bradbury Family Trust(2)

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(1)	05/22/2026		M			13,667	(3)	(3)	Common Stock	13,667	$0	0	D

Explanation of Responses:

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

2. Held by Bradbury Family Trust of which the Reporting Person and Annette Bradbury are the trustees and the beneficiaries.

3. The RSUs vest in full on the earlier of the (a) one-year anniversary of the date on May 22, 2026, 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	05/27/2025
	** 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)