Director at Castle Biosciences (NASDAQ: CSTL) converts 13,667 RSUs to shares

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Castle Biosciences director Ellen Goldberg exercised restricted stock units into common shares. On May 22, 2026, she converted 13,667 Restricted Stock Units into 13,667 shares of Common Stock at a stated price of $0.00 per share. Following this equity award conversion, she directly holds 40,921 shares of Castle Biosciences common stock. The filing shows no open-market purchases or sales, indicating a routine compensation-related share issuance rather than a discretionary trade.

Insider Trade Summary

13,667 shares exercised/converted

Mixed 2 txns

Insider Goldberg Ellen

Role null

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

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct, null); Common Stock — 40,921 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 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 units Common shares received: 13,667 shares Holding after transaction: 40,921 shares +1 more

4 metrics

RSUs exercised 13,667 units Restricted Stock Units converted to common stock on May 22, 2026

Common shares received 13,667 shares Common Stock issued upon RSU conversion on May 22, 2026

Holding after transaction 40,921 shares Total direct Common Stock owned by Ellen Goldberg after conversion

RSU conversion price $0.00 per unit Stated transaction price per Restricted Stock Unit converted

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 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.

RSU financial

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

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."

Form 4 Insider Transactions: What Each Field Means →

05/27/2026 - 04:17 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^*

Goldberg Ellen

(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)
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)
Common Stock	05/22/2026		M		13,667	A	⁽¹⁾	40,921	D

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⁾	05/22/2026		M			13,667	⁽²⁾	⁽²⁾	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. 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did CSTL director Ellen Goldberg report?

Ellen Goldberg reported exercising 13,667 Restricted Stock Units into 13,667 shares of Castle Biosciences common stock. The transaction reflects conversion of an equity award rather than an open-market trade, with a reported price of $0.00 per share for the RSU conversion.

How many Castle Biosciences (CSTL) shares does Ellen Goldberg hold after this Form 4?

After the RSU conversion, Ellen Goldberg directly holds 40,921 shares of Castle Biosciences common stock. This total reflects her position following the issuance of 13,667 new shares in exchange for vested Restricted Stock Units reported in the Form 4 filing.

Did Ellen Goldberg buy or sell Castle Biosciences (CSTL) shares on the open market?

The Form 4 does not show any open-market purchases or sales by Ellen Goldberg. It reports an exercise of 13,667 Restricted Stock Units into common shares, a compensation-related conversion rather than a market trade involving a purchase or sale price.

What does the 13,667 RSU exercise mean for Castle Biosciences (CSTL) shareholders?

The 13,667 RSU exercise represents additional common shares issued to a director as equity compensation. It slightly increases the share count but is routine in structure. The filing does not disclose any broader corporate changes or new financial results affecting Castle Biosciences shareholders.

How are Ellen Goldberg’s Restricted Stock Units in CSTL described in the filing?

Each Restricted Stock Unit represents the right to receive one share of Castle Biosciences common stock. The filing notes that these RSUs convert one-for-one into common shares, consistent with typical equity award structures used for director compensation at public companies.