MAETZOLD DEREK J

PrivateCIK: 1239501
Location

FRIENDSWOOD, TX

MAETZOLD DEREK J (Pres. & Chief Exec. Officer) sold 85.5% of their position (9.84K shares) of CASTLE BIOSCIENCES INC on the open market

Open‑market sale worth $205.1K — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 7 sales
InsiderMAETZOLD DEREK JCIK 1239501
IssuerCASTLE BIOSCIENCES INCCIK 1447362
DirectorOfficer10% Owner· Pres. & Chief Exec. Officer
Since Jul 2019
-9.84K
Net shares
Net seller
$205.1K
Total sold
7
Open market trades
0B · 7S
11
Total transactions
6.21K acquired · 16.05K disposed
Non-Derivative Transactions9

Common Stock

Direct
M · Option Exercise

Shares

+204.00

Price / share

$2.39

Trade value

$487.56

% of position

0.9%
6/1/2026
21.48K21.68K

Common Stock

Direct
M · Option Exercise

Shares

+6.01K

Price / share

$2.39

Trade value

$14.36K

% of position

27.7%
6/1/2026
21.68K27.69K

Common Stock

Direct
S · Sale

Shares

6.21K

Price / share

$20.86

Trade value

$129.61K

% of position

22.4%
6/1/2026
27.69K21.48K

Common Stock

Indirect
S · Sale

Shares

1.36K

Price / share

$20.86

Trade value

$28.30K

% of position

3.0%
6/1/2026
44.78K43.42K

Common Stock

Indirect
S · Sale

Shares

1.15K

Price / share

$20.86

Trade value

$24.05K

% of position

3.0%
6/1/2026
38.06K36.91K

Common Stock

Indirect
S · Sale

Shares

278.00

Price / share

$20.86

Trade value

$5.80K

% of position

14.3%
6/1/2026
1.95K1.67K

Common Stock

Indirect
S · Sale

Shares

278.00

Price / share

$20.86

Trade value

$5.80K

% of position

14.3%
6/1/2026
1.95K1.67K

Common Stock

Indirect
S · Sale

Shares

278.00

Price / share

$20.86

Trade value

$5.80K

% of position

14.3%
6/1/2026
1.95K1.67K

Common Stock

Indirect
S · Sale

Shares

278.00

Price / share

$20.86

Trade value

$5.80K

% of position

14.3%
6/1/2026
1.95K1.67K
Total

Net shares

3.62K

Net value

-$190.30K

Derivative Transactions2

Stock option (right to buy)

Direct
M · Option Exercise
Converts to

Common Stock

204.00 shares

Shares

204.00

Strike price

2.39

Held after

0.00

Exercisable

6/1/2026

Stock option (right to buy)

Direct
M · Option Exercise
Converts to

Common Stock

6.01K shares

Shares

6.01K

Strike price

2.39

Held after

92.43K

Exercisable

6/1/2026
Non-Derivative Holdings (Post-Transaction)3

Common Stock

Indirect
Shares owned85.96K

Common Stock

Indirect
Shares owned44.32K

Common Stock

Indirect
Shares owned18.72K
Total
149K indirect149K
Derivative Holdings (Post-Transaction)0
No derivative holdings reported
MAETZOLD DEREK J — Insider Transaction (Form 4) Filed Jun 3, 2026 | Finecho