Key facts
- This page summarizes Derek J. Maetzold's Form 4 filing for CASTLE BIOSCIENCES INC (CSTL).
- 11 reported transactions and 2 derivative rows are listed below.
- Accepted by SEC: 03 Jun 2026, 16:15.
Derek J. Maetzold - 01 Jun 2026 Form 4 Insider Report for CASTLE BIOSCIENCES INC (CSTL)
- Reporting relationship
- Pres. & Chief Exec. Officer, Director
- Issuer ticker
- CSTL
- Reported as of
- 01 Jun 2026
- Net transaction value
- -$205,149
- SEC form
- 4
- Accepted by SEC
- 03 Jun 2026, 16:15:50 UTC
- Prior SEC filing
- 22 May 2026
- Next SEC filing
- 17 Jun 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
Derek J. Maetzold filed Form 4 for CASTLE BIOSCIENCES INC (CSTL) on 03 Jun 2026.
Change
- Previous filing in this sequence was filed on 22 May 2026.
- Current net transaction value: -$205,149.
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 0001239501
Primary reporting owner
MAETZOLD DEREK J
- Relationship
- Pres. & Chief Exec. Officer, Director
- Address
- C/O CASTLE BIOSCIENCES, INC., 1500 W. PARKWOOD AVE SUITE 400, FRIENDSWOOD
- Signature
- /s/ Frank Stokes, Attorney-in-fact
- Signature date
- 03 Jun 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
CSTL
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +204
- Change %
- +0.95%
- Price
- $2.39*
- Shares after
- 21,683
- Date
- 01 Jun 2026
- Ownership
- Direct
- Footnotes
- F1
CSTL
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +6,010
- Change %
- +28%
- Price
- $2.39*
- Shares after
- 27,693
- Date
- 01 Jun 2026
- Ownership
- Direct
- Footnotes
- F1
CSTL
transaction
Common Stock
Sale
- Transaction value
- $129,605
- Shares
- -6,214
- Change %
- -22%
- Price
- $20.86
- Shares after
- 21,479
- Date
- 01 Jun 2026
- Ownership
- Direct
- Footnotes
- F1, F2
CSTL
transaction
Common Stock
Sale
- Transaction value
- $28,303
- Shares
- -1,357
- Change %
- -3%
- Price
- $20.86
- Shares after
- 43,424
- Date
- 01 Jun 2026
- Ownership
- By The Maetzold Descendants 2020 Trust
- Footnotes
- F1, F2, F3
CSTL
transaction
Common Stock
Sale
- Transaction value
- $24,048
- Shares
- -1,153
- Change %
- -3%
- Price
- $20.86
- Shares after
- 36,908
- Date
- 01 Jun 2026
- Ownership
- By Derek Maetzold 2020 Irrevocable Trust
- Footnotes
- F1, F2, F4
CSTL
transaction
Common Stock
Sale
- Transaction value
- $5,798
- Shares
- -278
- Change %
- -14%
- Price
- $20.86
- Shares after
- 1,668
- Date
- 01 Jun 2026
- Ownership
- By The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk
- Footnotes
- F1, F2, F5
CSTL
transaction
Common Stock
Sale
- Transaction value
- $5,798
- Shares
- -278
- Change %
- -14%
- Price
- $20.86
- Shares after
- 1,668
- Date
- 01 Jun 2026
- Ownership
- By The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold
- Footnotes
- F1, F2, F6
CSTL
transaction
Common Stock
Sale
- Transaction value
- $5,798
- Shares
- -278
- Change %
- -14%
- Price
- $20.86
- Shares after
- 1,668
- Date
- 01 Jun 2026
- Ownership
- By The Maetzold 2018 Remainder Trust FBO John Derek Maetzold
- Footnotes
- F1, F2, F7
CSTL
transaction
Common Stock
Sale
- Transaction value
- $5,798
- Shares
- -278
- Change %
- -14%
- Price
- $20.86
- Shares after
- 1,668
- Date
- 01 Jun 2026
- Ownership
- By The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold
- Footnotes
- F1, F2, F8
CSTL
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 85,959
- Date
- 01 Jun 2026
- Ownership
- By DJM Grantor Retained Annuity Trust No. 5
- Footnotes
- F9
CSTL
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 18,718
- Date
- 01 Jun 2026
- Ownership
- By DJM Grantor Retained Annuity Trust No. 6
- Footnotes
- F10
CSTL
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 44,323
- Date
- 01 Jun 2026
- Ownership
- By DJM Grantor Retained Annuity Trust No. 7
- Footnotes
- F11
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
CSTL
transaction
Derivative
Stock option (right to buy)
Options Exercise
- Transaction value
- Shares
- -204
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 01 Jun 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 204
- Exercise price
- $2.39
- Footnotes
- F1, F12
CSTL
transaction
Derivative
Stock option (right to buy)
Options Exercise
- Transaction value
- Shares
- -6,010
- Change %
- -6.1%
- Price
- $0.000000*
- Shares after
- 92,431
- Date
- 01 Jun 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 6,010
- Exercise price
- $2.39
- Footnotes
- F1, F12
* 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 12 footnotes
Footnote F1
These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on December 3, 2025.
Footnote F2
This transaction was executed in multiple trades at prices ranging from $20.470 to $21.175, 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
Held by The Maetzold Descendants 2020 Trust of which the Reporting Person's spouse is the trustee and the Reporting Person's spouse and their children are beneficiaries.
Footnote F4
Held by Derek Maetzold 2020 Irrevocable Trust of which the Reporting Person is the trustee and his children are beneficiaries.
Footnote F5
Held by The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk of which the Reporting Person is the trustee and his child is the beneficiary.
Footnote F6
Held by The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold of which the Reporting Person is the trustee and his child is the beneficiary.
Footnote F7
Held by The Maetzold 2018 Remainder Trust FBO John Derek Maetzold of which the Reporting Person is the trustee and his child is the beneficiary.
Footnote F8
Held by The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold of which the Reporting Person is the trustee and his child is the beneficiary.
Footnote F9
Held by DJM Grantor Retained Annuity Trust No. 5 of which the Reporting Person is the trustee and beneficiary.
Footnote F10
Held by DJM Grantor Retained Annuity Trust No. 6 of which the Reporting Person is the trustee and the beneficiaries are The Maetzold 2018 Remainder Trust FBO John Derek Maetzold, The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk, The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold and The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold.
Footnote F11
Held by DJM Grantor Retained Annuity Trust No. 7 of which the Reporting Person is the trustee and beneficiary.
Footnote F12
The shares subject to the option are fully vested.