MAETZOLD DEREK J

PrivateCIK: 1239501
Location

FRIENDSWOOD, TX

MAETZOLD DEREK J (Pres. & Chief Exec. Officer) sold 45.4% of their position (9.84K shares) of CASTLE BIOSCIENCES INC on the open market

Open‑market sale worth $237.7K — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 14 sales
InsiderMAETZOLD DEREK JCIK 1239501
→
IssuerCASTLE BIOSCIENCES INCCIK 1447362
DirectorOfficer10% Owner· Pres. & Chief Exec. Officer
Since Jul 2019
-9.84K
Net shares
Net seller
$237.7K
Total sold
14
Open market trades
0B · 14S
16
Total transactions
6.21K acquired · 16.05K disposed
Non-Derivative Transactions15

Common Stock

Direct
M · Option Exercise

Shares

+6.21K

Price / share

$2.39

Trade value

$14.85K

% of position

28.9%
7/27/2026
21.48K→27.69K

Common Stock

Direct
S · Sale

Shares

−5.98K

Price / share

$24.13

Trade value

$144.35K

% of position

21.6%
7/27/2026
27.69K→21.71K

Common Stock

Indirect
S · Sale

Shares

−1.31K

Price / share

$24.13

Trade value

$31.54K

% of position

3.3%
7/27/2026
39.35K→38.05K

Common Stock

Indirect
S · Sale

Shares

−1.11K

Price / share

$24.13

Trade value

$26.78K

% of position

3.3%
7/27/2026
33.45K→32.34K

Common Stock

Indirect
S · Sale

Shares

−268.00

Price / share

$24.13

Trade value

$6.47K

% of position

2.2%
7/27/2026
12.09K→11.82K

Common Stock

Indirect
S · Sale

Shares

−268.00

Price / share

$24.13

Trade value

$6.47K

% of position

2.2%
7/27/2026
12.09K→11.82K

Common Stock

Indirect
S · Sale

Shares

−268.00

Price / share

$24.13

Trade value

$6.47K

% of position

2.2%
7/27/2026
12.09K→11.82K

Common Stock

Indirect
S · Sale

Shares

−268.00

Price / share

$24.13

Trade value

$6.47K

% of position

2.2%
7/27/2026
12.09K→11.82K

Common Stock

Direct
S · Sale

Shares

−232.00

Price / share

$25.06

Trade value

$5.81K

% of position

1.1%
7/27/2026
21.71K→21.48K

Common Stock

Indirect
S · Sale

Shares

−50.00

Price / share

$25.06

Trade value

$1.25K

% of position

0.1%
7/27/2026
38.05K→38K

Common Stock

Indirect
S · Sale

Shares

−43.00

Price / share

$25.06

Trade value

$1.08K

% of position

0.1%
7/27/2026
32.34K→32.30K

Common Stock

Indirect
S · Sale

Shares

−10.00

Price / share

$25.06

Trade value

$250.60

% of position

0.1%
7/27/2026
11.82K→11.81K

Common Stock

Indirect
S · Sale

Shares

−10.00

Price / share

$25.06

Trade value

$250.60

% of position

0.1%
7/27/2026
11.82K→11.81K

Common Stock

Indirect
S · Sale

Shares

−10.00

Price / share

$25.06

Trade value

$250.60

% of position

0.1%
7/27/2026
11.82K→11.81K

Common Stock

Indirect
S · Sale

Shares

−10.00

Price / share

$25.06

Trade value

$250.60

% of position

0.1%
7/27/2026
11.82K→11.81K
Total

Net shares

−3.62K

Net value

-$222.83K

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

78.90K

Exercisable

—

7/27/2026
Non-Derivative Holdings (Post-Transaction)3

Common Stock

Indirect
Shares owned44.32K

Common Stock

Indirect
Shares owned18.72K

Common Stock

Indirect
Shares owned40.94K
Total
103.98K indirect103.98K
Derivative Holdings (Post-Transaction)0
No derivative holdings reported
MAETZOLD DEREK J — Insider Transaction (Form 4) Filed Jul 29, 2026 | Finecho