Derek J. Maetzold - 03 Mar 2026 Form 4 Insider Report for CASTLE BIOSCIENCES INC (CSTL)

Reporting relationship
Pres. & Chief Exec. Officer, Director
Issuer ticker
CSTL
Reported as of
03 Mar 2026
Net transaction value
$0
Source evidence Original filing metadata and source links for verification. 5 source fields
SEC form
4
Accepted by SEC
05 Mar 2026, 17:12:16 UTC
Prior SEC filing
05 Feb 2026
Next SEC filing
13 Mar 2026
Source filing
View source filing
Reporting owner 1 detail
Reporting owner signature
/s/ Frank Stokes, Attorney-in-fact

Key filing fact

Derek J. Maetzold filed Form 4 for CASTLE BIOSCIENCES INC (CSTL) on 05 Mar 2026.

Key facts

  • This page summarizes Derek J. Maetzold's Form 4 filing for CASTLE BIOSCIENCES INC (CSTL).
  • 6 reported transactions and 3 derivative rows are listed below.
  • Accepted by SEC: 05 Mar 2026, 17:12.

Change

  • Previous filing in this sequence was filed on 05 Feb 2026.
  • Current net transaction value: $0.

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

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

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
05 Mar 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CSTL transaction

Common Stock

Tax liability

Transaction value
Shares
-19,043
Change %
-23%
Price
$27.57*
Shares after
64,655
Date
03 Mar 2026
Ownership
Direct
Footnotes
F1
CSTL transaction

Common Stock

Options Exercise

Transaction value
Shares
+59,097
Change %
+91%
Price
Shares after
123,752
Date
04 Mar 2026
Ownership
Direct
Footnotes
F2
CSTL transaction

Common Stock

Tax liability

Transaction value
Shares
-17,931
Change %
-14%
Price
$28.17*
Shares after
105,821
Date
04 Mar 2026
Ownership
Direct
CSTL holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
52,923
Date
03 Mar 2026
Ownership
By The Maetzold Descendants 2020 Trust
Footnotes
F3
CSTL holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
44,986
Date
03 Mar 2026
Ownership
By Derek Maetzold 2020 Irrevocable Trust
Footnotes
F4
CSTL holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
3,618
Date
03 Mar 2026
Ownership
By The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk
Footnotes
F5
CSTL holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
3,615
Date
03 Mar 2026
Ownership
By The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold
Footnotes
F6
CSTL holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
3,615
Date
03 Mar 2026
Ownership
By The Maetzold 2018 Remainder Trust FBO John Derek Maetzold
Footnotes
F7
CSTL holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
3,615
Date
03 Mar 2026
Ownership
By The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold
Footnotes
F8
CSTL holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
85,959
Date
03 Mar 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
03 Mar 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
03 Mar 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

Restricted Stock Units

Award

Transaction value
Shares
+102,597
Change %
Price
$0.000000*
Shares after
102,597
Date
03 Mar 2026
Ownership
Direct
Underlying class
Common Stock
Underlying amount
102,597
Exercise price
Footnotes
F2, F12
CSTL transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares
-31,110
Change %
-33%
Price
$0.000000*
Shares after
62,218
Date
04 Mar 2026
Ownership
Direct
Underlying class
Common Stock
Underlying amount
31,110
Exercise price
Footnotes
F2, F13
CSTL transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares
-27,987
Change %
-25%
Price
$0.000000*
Shares after
83,961
Date
04 Mar 2026
Ownership
Direct
Underlying class
Common Stock
Underlying amount
27,987
Exercise price
Footnotes
F2, F14
* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 14 footnotes

Footnote F1

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 F2

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

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 RSU's vest in four equal annual installments beginning on March 03, 2027.

Footnote F13

On March 4, 2024, the Reporting Person was granted 124,437 RSUs which vest in four equal installments beginning on March 4, 2025.

Footnote F14

On March 4, 2025, the Reporting Person was granted 111,948 RSUs which vest in four equal installments beginning on March 4, 2026.

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