MAETZOLD DEREK J

PrivateCIK: 1239501
Location

FRIENDSWOOD, TX

MAETZOLD DEREK J (Pres. & Chief Exec. Officer) sold 54.2% of their position (14.52K shares) of CASTLE BIOSCIENCES INC on the open market

Open‑market sale worth $464.9K — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 6 sales
InsiderMAETZOLD DEREK JCIK 1239501
→
IssuerCASTLE BIOSCIENCES INCCIK 1447362
DirectorOfficer10% Owner· Pres. & Chief Exec. Officer
Since Jul 2019
-14.52K
Net shares
Net seller
$464.9K
Total sold
6
Open market trades
0B · 6S
8
Total transactions
8.58K acquired · 23.10K disposed
Non-Derivative Transactions7

Common Stock

Direct
M · Option Exercise

Shares

+8.58K

Price / share

$2.39

Trade value

$20.52K

% of position

40.0%
9/11/2026
21.48K→30.06K

Common Stock

Direct
S · Sale

Shares

−8.36K

Price / share

$32.00

Trade value

$267.55K

% of position

27.8%
9/11/2026
30.06K→21.70K

Common Stock

Indirect
S · Sale

Shares

−3.12K

Price / share

$32.00

Trade value

$99.97K

% of position

17.7%
9/11/2026
17.64K→14.52K

Common Stock

Indirect
S · Sale

Shares

−2.66K

Price / share

$32.00

Trade value

$84.99K

% of position

17.7%
9/11/2026
14.99K→12.34K

Common Stock

Direct
S · Sale

Shares

−223.00

Price / share

$32.78

Trade value

$7.31K

% of position

1.0%
9/11/2026
21.70K→21.48K

Common Stock

Indirect
S · Sale

Shares

−83.00

Price / share

$32.78

Trade value

$2.72K

% of position

0.6%
9/11/2026
14.52K→14.43K

Common Stock

Indirect
S · Sale

Shares

−71.00

Price / share

$32.78

Trade value

$2.33K

% of position

0.6%
9/11/2026
12.34K→12.27K
Total

Net shares

−5.93K

Net value

-$444.35K

Derivative Transactions1

Stock option (right to buy)

Direct
M · Option Exercise
Converts to

Common Stock

8.58K shares

Shares

−8.58K

Strike price

2.39

Held after

16.75K

Exercisable

—

9/11/2026
Non-Derivative Holdings (Post-Transaction)8

Common Stock

Indirect
Shares owned11.26K

Common Stock

Indirect
Shares owned40.94K

Common Stock

Indirect
Shares owned27.86K

Common Stock

Indirect
Shares owned11.26K

Common Stock

Indirect
Shares owned11.26K

Common Stock

Indirect
Shares owned11.96K

Common Stock

Indirect
Shares owned23.22K

Common Stock

Indirect
Shares owned11.26K
Total
149K indirect149K
Derivative Holdings (Post-Transaction)0
No derivative holdings reported