Key facts
- This page summarizes Frank Stokes's Form 4 filing for CASTLE BIOSCIENCES INC (CSTL).
- 10 reported transactions and 4 derivative rows are listed below.
- Accepted by SEC: 05 Mar 2026, 17:08.
Frank Stokes - 03 Mar 2026 Form 4 Insider Report for CASTLE BIOSCIENCES INC (CSTL)
- Reporting relationship
- Chief Financial Officer
- Issuer ticker
- CSTL
- Reported as of
- 03 Mar 2026
- Net transaction value
- -$192,073
- SEC form
- 4
- Accepted by SEC
- 05 Mar 2026, 17:08:38 UTC
- Prior SEC filing
- 14 Jan 2026
- Next SEC filing
- 09 Mar 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Frank Stokes, Attorney-in-fact
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Frank Stokes filed Form 4 for CASTLE BIOSCIENCES INC (CSTL) on 05 Mar 2026.
Change
- Previous filing in this sequence was filed on 14 Jan 2026.
- Current net transaction value: -$192,073.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001782815
Primary reporting owner
Stokes Frank
- Relationship
- Chief Financial Officer
- Address
- C/O CASTLE BIOSCIENCES, INC., 1500 W. PARKWOOD AVE SUITE 400, FRIENDSWOOD
- Signature
- /s/ Frank Stokes, Attorney-in-fact
- Signature date
- 05 Mar 2025
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
CSTL
transaction
Common Stock
Sale
- Transaction value
- $144,796
- Shares
- -5,300
- Change %
- -8.9%
- Price
- $27.32
- Shares after
- 54,183
- Date
- 03 Mar 2026
- Ownership
- Direct
- Footnotes
- F1, F2, F3
CSTL
transaction
Common Stock
Sale
- Transaction value
- $47,277
- Shares
- -1,700
- Change %
- -3.1%
- Price
- $27.81
- Shares after
- 52,483
- Date
- 03 Mar 2026
- Ownership
- Direct
- Footnotes
- F1, F4
CSTL
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -3,611
- Change %
- -6.9%
- Price
- $27.57*
- Shares after
- 48,872
- Date
- 03 Mar 2026
- Ownership
- Direct
- Footnotes
- F5
CSTL
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +24,146
- Change %
- +49%
- Price
- Shares after
- 73,018
- Date
- 04 Mar 2026
- Ownership
- Direct
- Footnotes
- F6
CSTL
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -10,732
- Change %
- -15%
- Price
- $28.17*
- Shares after
- 62,286
- Date
- 04 Mar 2026
- Ownership
- Direct
CSTL
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +3,800
- Change %
- +6.1%
- Price
- $3.38*
- Shares after
- 66,086
- Date
- 04 Mar 2026
- Ownership
- Direct
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
CSTL
transaction
Derivative
Restricted Stock Units
Award
- Transaction value
- Shares
- +48,367
- Change %
- Price
- $0.000000*
- Shares after
- 48,367
- Date
- 03 Mar 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 48,367
- Exercise price
- Footnotes
- F6, F7
CSTL
transaction
Derivative
Restricted Stock Units
Options Exercise
- Transaction value
- Shares
- -12,186
- Change %
- -33%
- Price
- $0.000000*
- Shares after
- 24,372
- Date
- 04 Mar 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 12,186
- Exercise price
- Footnotes
- F6, F8
CSTL
transaction
Derivative
Restricted Stock Units
Options Exercise
- Transaction value
- Shares
- -11,960
- Change %
- -25%
- Price
- $0.000000*
- Shares after
- 35,878
- Date
- 04 Mar 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 11,960
- Exercise price
- Footnotes
- F6, F9
CSTL
transaction
Derivative
Stock option (right to buy)
Options Exercise
- Transaction value
- Shares
- -3,800
- Change %
- -20%
- Price
- $0.000000*
- Shares after
- 14,912
- Date
- 04 Mar 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 3,800
- Exercise price
- $3.38
- Footnotes
- F10
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Rule 10b5-1 trading plan
These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.
Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).
Explanation of responses 10 footnotes
Footnote F1
The transaction on this Form 4 was made pursuant to a Rule 10b5-1 plan adopted by Frank Stokes on November 13, 2025.
Footnote F2
This transaction was executed in multiple trades at prices ranging from $26.70 to $27.67, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
Footnote F3
Includes 1,033 shares acquired on February 27, 2026, under the Issuer's employee stock purchase plan.
Footnote F4
This transaction was executed in multiple trades at prices ranging from $27.72 to $27.97, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
Footnote F5
Reflects the withholding of shares of the Issuer's common stock to satisfy tax withholding obligations in connection with the delivery of vested performance stock units reported on January 12, 2026.
Footnote F6
Each Restricted Stock Unit ("RSU") represents the right to receive one share of the Issuer's Common Stock.
Footnote F7
The RSU's vest in four equal annual installments beginning on March 03, 2027.
Footnote F8
On March 4, 2024, the Reporting Person was granted 48,744 RSUs which vest in four equal installments beginning on March 4, 2025.
Footnote F9
On March 4, 2025, the Reporting Person was granted 47,838 RSUs which vest in four equal installments beginning on March 4, 2026.
Footnote F10
The shares subject to the option are fully vested.