MAETZOLD DEREK J

PrivateCIK: 1239501
Location

FRIENDSWOOD, TX

Senior insider sale

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

$3.47M

140.40K shares

What this filing means

MAETZOLD DEREK J plans to sell 140.40K shares of CASTLE BIOSCIENCES INC valued at approximately $3.47M. 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
140.40K
Shares to sell
$3.47M
Approx. market value
14.01K
Acquired (3 months)
1
Planned
63 completed
Securities Acquired — Last 3 Months8
Sort

Acquired as compensation -- Stock Options

Compensation -- Cashless exercise / same-day sale

11/12/2018
204.00

Acquired as compensation -- Stock Options

Compensation -- Cashless exercise / same-day sale

5/10/2018
6.56K

Acquired as gift

None

Gift
10/29/2007
2.31K

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
556.00

Acquired as gift

None

Gift
10/29/2007
2.71K
Total acquired14.01K
Planned & Completed Dispositions64
Sort

Completed

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

1.03K

Market value

$20.8K

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

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

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

66.00

Market value

$1.3K

5/20/2026
Completed

Units to sell

322.00

Market value

$6.4K

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

273.00

Market value

$5.4K

5/20/2026
Completed

Units to sell

278.00

Market value

$6.1K

5/7/2026
Completed

Units to sell

1.36K

Market value

$30.0K

5/7/2026
Completed

Units to sell

278.00

Market value

$6.1K

5/7/2026
Completed

Units to sell

1.15K

Market value

$25.5K

5/7/2026
Completed

Units to sell

6.21K

Market value

$137.3K

5/7/2026
Completed

Units to sell

278.00

Market value

$6.1K

5/7/2026
Completed

Units to sell

278.00

Market value

$6.1K

5/7/2026
Completed

Units to sell

278.00

Market value

$7.0K

4/21/2026
Completed

Units to sell

278.00

Market value

$7.0K

4/21/2026
Completed

Units to sell

1.36K

Market value

$34.0K

4/21/2026
Completed

Units to sell

1.15K

Market value

$28.9K

4/21/2026
Completed

Units to sell

278.00

Market value

$7.0K

4/21/2026
Completed

Units to sell

278.00

Market value

$7.0K

4/21/2026
Completed

Units to sell

550.00

Market value

$13.8K

4/21/2026
Completed

Units to sell

278.00

Market value

$6.9K

4/6/2026
Completed

Units to sell

278.00

Market value

$6.9K

4/6/2026
Completed

Units to sell

278.00

Market value

$6.9K

4/6/2026
Completed

Units to sell

1.15K

Market value

$28.8K

4/6/2026
Completed

Units to sell

6.21K

Market value

$155.2K

4/6/2026
Completed

Units to sell

1.36K

Market value

$33.9K

4/6/2026
Completed

Units to sell

278.00

Market value

$6.9K

4/6/2026
Completed

Units to sell

278.00

Market value

$7.1K

3/26/2026
Completed

Units to sell

550.00

Market value

$14.0K

3/26/2026
Completed

Units to sell

1.15K

Market value

$29.4K

3/26/2026
Completed

Units to sell

278.00

Market value

$7.1K

3/26/2026
Completed

Units to sell

278.00

Market value

$7.1K

3/26/2026
Completed

Units to sell

278.00

Market value

$7.1K

3/26/2026
Completed

Units to sell

1.36K

Market value

$34.6K

3/26/2026
Completed

Units to sell

650.00

Market value

$16.5K

3/18/2026
Completed

Units to sell

18.65K

Market value

$482.4K

3/17/2026
Completed

Units to sell

17.57K

Market value

$455.4K

3/16/2026
Completed

Units to sell

13.20K

Market value

$335.2K

3/13/2026
Completed

Units to sell

23.18K

Market value

$584.5K

3/12/2026
Completed

Units to sell

621.00

Market value

$16.3K

3/11/2026
Completed

Units to sell

5.68K

Market value

$147.0K

3/11/2026
Completed

Units to sell

166.00

Market value

$4.3K

3/11/2026
Completed

Units to sell

736.00

Market value

$19.3K

3/11/2026
Completed

Units to sell

116.00

Market value

$3.0K

3/11/2026
Completed

Units to sell

163.00

Market value

$4.3K

3/11/2026
Completed

Units to sell

113.00

Market value

$3.0K

3/11/2026
Completed

Units to sell

662.00

Market value

$17.3K

3/11/2026
Completed

Units to sell

498.00

Market value

$13.1K

3/11/2026
Completed

Units to sell

163.00

Market value

$4.3K

3/11/2026
Completed

Units to sell

83.00

Market value

$2.2K

3/11/2026
Completed

Units to sell

2.64K

Market value

$69.3K

3/11/2026
Completed

Units to sell

199.00

Market value

$5.2K

3/11/2026
Completed

Units to sell

116.00

Market value

$3.0K

3/11/2026
Completed

Units to sell

5.41K

Market value

$140.1K

3/11/2026
Completed

Units to sell

3.59K

Market value

$93.9K

3/11/2026

Planned — Approximate Date

NASDPlanned

Units to sell

14.01K

Market value

$293.7K

6/1/2026
Total

Units

140.40K

Value

$3.47M

MAETZOLD DEREK J — Planned Insider Sale (Form 144) | Finecho