MAETZOLD DEREK J

PrivateCIK: 1239501
Location

FRIENDSWOOD, TX

MAETZOLD DEREK J (Pres. & Chief Exec. Officer) sold 44.3% of their position (9.84K shares) of CASTLE BIOSCIENCES INC on the open market

Open‑market sale worth $238.9K — 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
$238.9K
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%
7/1/2026
21.48K27.69K

Common Stock

Direct
S · Sale

Shares

6.21K

Price / share

$24.29

Trade value

$150.94K

% of position

22.4%
7/1/2026
27.69K21.48K

Common Stock

Indirect
S · Sale

Shares

1.36K

Price / share

$24.29

Trade value

$32.96K

% of position

3.2%
7/1/2026
42.07K40.71K

Common Stock

Indirect
S · Sale

Shares

1.15K

Price / share

$24.29

Trade value

$28.01K

% of position

3.2%
7/1/2026
35.76K34.60K

Common Stock

Indirect
S · Sale

Shares

278.00

Price / share

$24.29

Trade value

$6.75K

% of position

2.2%
7/1/2026
12.65K12.37K

Common Stock

Indirect
S · Sale

Shares

278.00

Price / share

$24.29

Trade value

$6.75K

% of position

2.2%
7/1/2026
12.65K12.37K

Common Stock

Indirect
S · Sale

Shares

278.00

Price / share

$24.29

Trade value

$6.75K

% of position

2.2%
7/1/2026
12.65K12.37K

Common Stock

Indirect
S · Sale

Shares

278.00

Price / share

$24.29

Trade value

$6.75K

% of position

2.2%
7/1/2026
12.65K12.37K
Total

Net shares

3.62K

Net value

-$224.06K

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

85.67K

Exercisable

7/1/2026
Non-Derivative Holdings (Post-Transaction)3

Common Stock

Indirect
Shares owned18.72K

Common Stock

Indirect
Shares owned40.94K

Common Stock

Indirect
Shares owned44.32K
Total
103.98K indirect103.98K
Derivative Holdings (Post-Transaction)0
No derivative holdings reported
MAETZOLD DEREK J — Insider Transaction (Form 4) Filed Jul 6, 2026 | Finecho