MAETZOLD DEREK J

PrivateCIK: 1239501
Location

FRIENDSWOOD, TX

MAETZOLD DEREK J (Pres. & Chief Exec. Officer) sold 78.0% of their position (9.84K shares) of CASTLE BIOSCIENCES INC on the open market

Open‑market sale worth $246.2K — 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
$246.2K
Total sold
7
Open market trades
0B · 7S
9
Total transactions
6.21K acquired · 16.05K disposed
Non-Derivative Transactions8

Common Stock

Direct
M · Option Exercise

Shares

+6.21K

Price / share

$2.39

Trade value

$14.85K

% of position

28.9%
4/6/2026
21.48K27.69K

Common Stock

Direct
S · Sale

Shares

6.21K

Price / share

$25.03

Trade value

$155.54K

% of position

22.4%
4/6/2026
27.69K21.48K

Common Stock

Indirect
S · Sale

Shares

1.36K

Price / share

$25.03

Trade value

$33.97K

% of position

2.7%
4/6/2026
50.21K48.85K

Common Stock

Indirect
S · Sale

Shares

1.15K

Price / share

$25.03

Trade value

$28.86K

% of position

2.7%
4/6/2026
42.67K41.52K

Common Stock

Indirect
S · Sale

Shares

278.00

Price / share

$25.03

Trade value

$6.96K

% of position

9.1%
4/6/2026
3.06K2.78K

Common Stock

Indirect
S · Sale

Shares

278.00

Price / share

$25.03

Trade value

$6.96K

% of position

9.1%
4/6/2026
3.06K2.78K

Common Stock

Indirect
S · Sale

Shares

278.00

Price / share

$25.03

Trade value

$6.96K

% of position

9.1%
4/6/2026
3.06K2.78K

Common Stock

Indirect
S · Sale

Shares

278.00

Price / share

$25.03

Trade value

$6.96K

% of position

9.1%
4/6/2026
3.06K2.78K
Total

Net shares

3.62K

Net value

-$231.34K

Derivative Transactions1

Stock option (right to buy)

Direct
M · Option Exercise
Converts to

Common Stock

6.21K shares

Shares

6.21K

Strike price

2.39

Held after

7.52K

Exercisable

4/6/2026
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 Apr 8, 2026 | Finecho