Derek J. Maetzold

CIK: 0001239501

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)401 (90.5%)

Position reduction

Option Exercises (M)30 (6.8%)

Derivative conversions

Awards (A)3 (0.7%)

Compensation grants

Other (G, F, J, C, D, …)9 (2.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

CSTL

CASTLE BIOSCIENCES INC

DirectorOfficer

Discretionary Trading P&L

Holdings

Transaction History (443 total)

CSTL
CASTLE BIOSCIENCES INC
Oct 19, 2026
Sale(S)
Direct
8.6K shares at avg. $31.91$274K
CSTL
CASTLE BIOSCIENCES INC
Oct 19, 2026
Sale(S)
Indirect
3.2K shares at avg. $31.91$102K
CSTL
CASTLE BIOSCIENCES INC
Oct 19, 2026
Sale(S)
Indirect
2.7K shares at avg. $31.91$87K
CSTL
CASTLE BIOSCIENCES INC
Oct 5, 2026
Sale(S)
Direct
8.6K shares at avg. $35.57$305K
CSTL
CASTLE BIOSCIENCES INC
Oct 5, 2026
Exercise(M)
Direct
8.2K shares at avg. $2.39$20K
CSTL
CASTLE BIOSCIENCES INC
Oct 5, 2026
Sale(S)
Indirect
3.2K shares at avg. $35.57$114K
CSTL
CASTLE BIOSCIENCES INC
Oct 5, 2026
Sale(S)
Indirect
2.7K shares at avg. $35.57$97K
CSTL
CASTLE BIOSCIENCES INC
Sep 21, 2026
Sale(S)
Indirect
3.2K shares at avg. $35.33$113K
CSTL
CASTLE BIOSCIENCES INC
Sep 21, 2026
Sale(S)
Direct
8.6K shares at avg. $35.33$303K
CSTL
CASTLE BIOSCIENCES INC
Sep 21, 2026
Sale(S)
Indirect
2.7K shares at avg. $35.33$96K
CSTL
CASTLE BIOSCIENCES INC
Sep 21, 2026
Exercise(M)
Direct
8.6K shares at avg. $2.39$21K
CSTL
CASTLE BIOSCIENCES INC
Sep 11, 2026
Sale(S)
Indirect
2.7K shares at avg. $32.00$85K
CSTL
CASTLE BIOSCIENCES INC
Sep 11, 2026
Sale(S)
Direct
8.4K shares at avg. $32.00$268K
CSTL
CASTLE BIOSCIENCES INC
Sep 11, 2026
Sale(S)
Direct
223 shares at avg. $32.78$7K
CSTL
CASTLE BIOSCIENCES INC
Sep 11, 2026
Sale(S)
Indirect
71 shares at avg. $32.78$2K
CSTL
CASTLE BIOSCIENCES INC
Sep 11, 2026
Exercise(M)
Direct
8.6K shares at avg. $2.39$21K
CSTL
CASTLE BIOSCIENCES INC
Sep 11, 2026
Sale(S)
Indirect
83 shares at avg. $32.78$3K
CSTL
CASTLE BIOSCIENCES INC
Sep 11, 2026
Sale(S)
Indirect
3.1K shares at avg. $32.00$100K
CSTL
CASTLE BIOSCIENCES INC
Aug 28, 2026
Sale(S)
Indirect
177 shares at avg. $33.88$6K
CSTL
CASTLE BIOSCIENCES INC
Aug 28, 2026
Sale(S)
Indirect
209 shares at avg. $33.88$7K
CSTL
CASTLE BIOSCIENCES INC
Aug 28, 2026
Exercise(M)
Direct
12.4K shares at avg. $2.39$30K
CSTL
CASTLE BIOSCIENCES INC
Aug 28, 2026
Sale(S)
Indirect
21 shares at avg. $33.88$711.48
CSTL
CASTLE BIOSCIENCES INC
Aug 28, 2026
Sale(S)
Indirect
257 shares at avg. $33.14$9K
CSTL
CASTLE BIOSCIENCES INC
Aug 28, 2026
Sale(S)
Indirect
2.1K shares at avg. $33.14$71K
CSTL
CASTLE BIOSCIENCES INC
Aug 28, 2026
Sale(S)
Indirect
257 shares at avg. $33.14$9K

		Type	Shares	Price		Ownership
Oct 19, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	8,580	$31.91	$273,788	Direct
Oct 19, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	3,198	$31.91	$102,048	Indirect
Oct 19, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	2,718	$31.91	$86,731	Indirect
Oct 5, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	8,580	$35.57	$305,156	Direct
Oct 5, 2026	CSTL CASTLE BIOSCIENCES INC	Exercise(M)	8,165	$2.39	$19,514	Direct
Oct 5, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	3,198	$35.57	$113,740	Indirect
Oct 5, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	2,718	$35.57	$96,668	Indirect
Sep 21, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	3,198	$35.33	$112,998	Indirect
Sep 21, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	8,580	$35.33	$303,166	Direct
Sep 21, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	2,718	$35.33	$96,038	Indirect
Sep 21, 2026	CSTL CASTLE BIOSCIENCES INC	Exercise(M)	8,580	$2.39	$20,506	Direct
Sep 11, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	2,656	$32.00	$84,992	Indirect
Sep 11, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	8,361	$32.00	$267,552	Direct
Sep 11, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	223	$32.78	$7,310	Direct
Sep 11, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	71	$32.78	$2,327	Indirect
Sep 11, 2026	CSTL CASTLE BIOSCIENCES INC	Exercise(M)	8,584	$2.39	$20,516	Direct
Sep 11, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	83	$32.78	$2,721	Indirect
Sep 11, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	3,124	$32.00	$99,968	Indirect
Aug 28, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	177	$33.88	$5,997	Indirect
Aug 28, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	209	$33.88	$7,081	Indirect
Aug 28, 2026	CSTL CASTLE BIOSCIENCES INC	Exercise(M)	12,428	$2.39	$29,703	Direct
Aug 28, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	21	$33.88	$711	Indirect
Aug 28, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	257	$33.14	$8,517	Indirect
Aug 28, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	2,129	$33.14	$70,555	Indirect
Aug 28, 2026	CSTL CASTLE BIOSCIENCES INC	Sale(S)	257	$33.14	$8,517	Indirect

1-25 of 443 transactions

…

About MAETZOLD DEREK J

MAETZOLD DEREK J (SEC CIK 0001239501) files insider reports with the SEC as Pres. & Chief Exec. Officer of CASTLE BIOSCIENCES INC (CSTL).

Signal8 holds 65 ownership filings by MAETZOLD DEREK J, all Form 4s, filed between Sep 3, 2024 and Oct 21, 2026. Those filings report 443 transactions, from Aug 29, 2024 to Oct 19, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on MAETZOLD DEREK J's filings is in FRIENDSWOOD, TX.

Recent filings by MAETZOLD DEREK J

Oct 19, 2026: Open-market sales of CSTL shares (3 lines, Form 4, code S).
Oct 5, 2026: Open-market sale of CSTL shares (Form 4, code S).
Oct 5, 2026: Option exercise of CSTL shares (Form 4, code M).
Oct 5, 2026: Open-market sales of CSTL shares (2 lines, Form 4, code S).
Sep 21, 2026: Open-market sales of CSTL shares (3 lines, Form 4, code S).

Other insiders filing for CASTLE BIOSCIENCES INC (CSTL)

Juvenal Tobin W, Chief Commercial Officer
Oelschlager Kristen M, Chief Operating Officer
Stokes Frank, Chief Financial Officer
Olson Tiffany, Director
Goldberg Ellen, Director
Harrison Miles, Director

How to read Form 4 transaction codes