Director at Castle Biosciences (CSTL) receives 11,766 RSU equity award

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

BRADBURY DANIEL reported acquisition or exercise transactions in this Form 4 filing.

CASTLE BIOSCIENCES INC director Daniel Bradbury received a grant of 11,766 Restricted Stock Units (RSUs). 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 after the grant date. Following this award, Bradbury is reported as holding 11,766 RSUs directly.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider BRADBURY DANIEL

Role null

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

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

Footnotes (1)

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

RSUs granted: 11,766 RSUs RSUs after transaction: 11,766 RSUs RSU-to-share ratio: 1 RSU = 1 share +1 more

4 metrics

RSUs granted 11,766 RSUs Grant to director Daniel Bradbury on May 28, 2026

RSUs after transaction 11,766 RSUs Total RSUs held directly following the award

RSU-to-share ratio 1 RSU = 1 share Each RSU represents one share of common stock

Vesting date trigger May 28, 2027 RSUs vest by this date or earlier if before next annual meeting

Key Terms

Restricted Stock Units, RSU, Annual Meeting of Stockholders

3 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"

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Form 4 Insider Transactions: What Each Field Means →

06/01/2026 - 04:44 PM

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)
05/28/2026

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

FAQ

What insider transaction did CSTL director Daniel Bradbury report?

Daniel Bradbury reported receiving 11,766 Restricted Stock Units from Castle Biosciences as a compensation award. These RSUs are a form of equity that can convert into common shares once they vest under the specified schedule.

How many Castle Biosciences (CSTL) RSUs were granted to Daniel Bradbury?

Daniel Bradbury was granted 11,766 Restricted Stock Units by Castle Biosciences. Each RSU represents the right to receive one share of common stock, giving him potential ownership of 11,766 shares once vesting conditions are satisfied.

When do Daniel Bradbury’s CSTL RSUs vest?

Bradbury’s RSUs vest in full on the earlier of May 28, 2027, or the day immediately before the next Annual Meeting of Stockholders. This means vesting depends either on time served or the timing of the company’s next annual meeting.

What does each CSTL Restricted Stock Unit granted to Daniel Bradbury represent?

Each Restricted Stock Unit granted to Daniel Bradbury represents the right to receive one share of Castle Biosciences common stock. Once the RSUs vest, they can settle in shares, aligning his compensation more closely with shareholder interests.

Is Daniel Bradbury’s CSTL Form 4 transaction a purchase or a grant?

The Form 4 shows a grant of 11,766 RSUs to Daniel Bradbury, not an open-market purchase. The transaction is coded as an award acquisition, reflecting stock-based compensation rather than buying or selling shares in the market.