MAETZOLD DEREK J

PrivateCIK: 1239501
Location

FRIENDSWOOD, TX

Senior insider sale

Pres. & Chief Exec. Officer at CASTLE BIOSCIENCES INC — senior position signals high conviction

$3.78M

135.48K shares

What this filing means

MAETZOLD DEREK J plans to sell 135.48K shares of CASTLE BIOSCIENCES INC valued at approximately $3.78M. Form 144 is a notice of intent to sell restricted or control securities — not a mandatory transaction. This filing provides advance warning of potential selling pressure.

InsiderMAETZOLD DEREK JCIK 1239501
IssuerCASTLE BIOSCIENCES INCCIK 1447362
DirectorOfficer10% Owner· Pres. & Chief Exec. Officer
Since Jul 2019
135.48K
Shares to sell
$3.78M
Approx. market value
25.79K
Acquired (3 months)
1
Planned
61 completed
Securities Acquired — Last 3 Months7
Sort

Acquired as compensation -- Stock Options

Compensation -- Cashless exercise / same-day sale

5/10/2018
13.53K

Acquired as gift

None

Gift
10/29/2007
5.43K

Acquired as gift

None

Gift
10/29/2007
556.00

Acquired as gift

None

Gift
10/29/2007
556.00

Acquired as gift

None

Gift
10/29/2007
556.00

Acquired as gift

None

Gift
10/29/2007
4.61K

Acquired as gift

None

Gift
10/29/2007
556.00
Total acquired25.79K
Planned & Completed Dispositions62
Sort

Completed

Completed

Units to sell

556.00

Market value

$17.0K

8/5/2026
Completed

Units to sell

473.00

Market value

$14.5K

8/5/2026
Completed

Units to sell

2.55K

Market value

$78.0K

8/5/2026
Completed

Units to sell

20.36K

Market value

$632.0K

8/4/2026
Completed

Units to sell

8.16K

Market value

$253.2K

8/4/2026
Completed

Units to sell

6.93K

Market value

$215.1K

8/4/2026
Completed

Units to sell

10.66K

Market value

$323.0K

8/3/2026
Completed

Units to sell

3.60K

Market value

$109.0K

8/3/2026
Completed

Units to sell

4.23K

Market value

$128.2K

8/3/2026
Completed

Units to sell

1.69K

Market value

$50.9K

7/31/2026
Completed

Units to sell

1.98K

Market value

$59.7K

7/31/2026
Completed

Units to sell

6.48K

Market value

$195.0K

7/31/2026
Completed

Units to sell

278.00

Market value

$6.7K

7/27/2026
Completed

Units to sell

1.36K

Market value

$32.7K

7/27/2026
Completed

Units to sell

278.00

Market value

$6.7K

7/27/2026
Completed

Units to sell

278.00

Market value

$6.7K

7/27/2026
Completed

Units to sell

6.21K

Market value

$149.8K

7/27/2026
Completed

Units to sell

278.00

Market value

$6.7K

7/27/2026
Completed

Units to sell

1.15K

Market value

$27.8K

7/27/2026
Completed

Units to sell

278.00

Market value

$6.4K

7/14/2026
Completed

Units to sell

278.00

Market value

$6.4K

7/14/2026
Completed

Units to sell

278.00

Market value

$6.4K

7/14/2026
Completed

Units to sell

1.36K

Market value

$31.0K

7/14/2026
Completed

Units to sell

278.00

Market value

$6.4K

7/14/2026
Completed

Units to sell

550.00

Market value

$12.6K

7/14/2026
Completed

Units to sell

1.15K

Market value

$26.4K

7/14/2026
Completed

Units to sell

278.00

Market value

$6.7K

7/1/2026
Completed

Units to sell

1.15K

Market value

$27.9K

7/1/2026
Completed

Units to sell

1.36K

Market value

$32.9K

7/1/2026
Completed

Units to sell

278.00

Market value

$6.7K

7/1/2026
Completed

Units to sell

6.21K

Market value

$150.5K

7/1/2026
Completed

Units to sell

278.00

Market value

$6.7K

7/1/2026
Completed

Units to sell

278.00

Market value

$6.7K

7/1/2026
Completed

Units to sell

278.00

Market value

$5.7K

6/15/2026
Completed

Units to sell

278.00

Market value

$5.7K

6/15/2026
Completed

Units to sell

278.00

Market value

$5.7K

6/15/2026
Completed

Units to sell

278.00

Market value

$5.7K

6/15/2026
Completed

Units to sell

550.00

Market value

$11.3K

6/15/2026
Completed

Units to sell

1.15K

Market value

$23.7K

6/15/2026
Completed

Units to sell

1.36K

Market value

$28.0K

6/15/2026
Completed

Units to sell

278.00

Market value

$5.8K

6/1/2026
Completed

Units to sell

1.36K

Market value

$28.2K

6/1/2026
Completed

Units to sell

278.00

Market value

$5.8K

6/1/2026
Completed

Units to sell

1.15K

Market value

$24.0K

6/1/2026
Completed

Units to sell

278.00

Market value

$5.8K

6/1/2026
Completed

Units to sell

6.21K

Market value

$129.2K

6/1/2026
Completed

Units to sell

278.00

Market value

$5.8K

6/1/2026
Completed

Units to sell

212.00

Market value

$4.3K

5/21/2026
Completed

Units to sell

212.00

Market value

$4.3K

5/21/2026
Completed

Units to sell

880.00

Market value

$17.7K

5/21/2026
Completed

Units to sell

212.00

Market value

$4.3K

5/21/2026
Completed

Units to sell

420.00

Market value

$8.5K

5/21/2026
Completed

Units to sell

212.00

Market value

$4.3K

5/21/2026
Completed

Units to sell

1.03K

Market value

$20.8K

5/21/2026
Completed

Units to sell

322.00

Market value

$6.4K

5/20/2026
Completed

Units to sell

66.00

Market value

$1.3K

5/20/2026
Completed

Units to sell

130.00

Market value

$2.6K

5/20/2026
Completed

Units to sell

66.00

Market value

$1.3K

5/20/2026
Completed

Units to sell

66.00

Market value

$1.3K

5/20/2026
Completed

Units to sell

273.00

Market value

$5.4K

5/20/2026
Completed

Units to sell

66.00

Market value

$1.3K

5/20/2026

Planned — Approximate Date

NASDPlanned

Units to sell

25.79K

Market value

$764.0K

8/14/2026
Total

Units

135.48K

Value

$3.78M