CSTL

insider transactions

CASTLE BIOSCIENCES INC — buys & sells by directors, officers and 10% owners (SEC Form 4).

30D 90D 1Y

Net shares · 30d

-20.9K

0 buy · 20.9K sell

Net value · 30d

-$434.6K

$0 in · $434.6K out

Sentiment · 30d

Net selling

0% buying · 100% selling

Open-market trades · 30d

0 buy · 20.9K sell

Net buy / sell volume

Tap or hover the chart for daily net volume. Green = net buying, red = net selling.

All transactions

Sell·S
Jun 16, 26

Kristen M Oelschlager

Chief Operating Officer · 10b5-1

$177.8K

8.6K sh · $20.71

Own -22%
Exercise·M
Jun 15, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$0

550 sh

Own +1%
Sell·S
Jun 15, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$5.7K

278 sh · $20.66

Own -2%
Sell·S
Jun 15, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$23.8K

1.2K sh · $20.66

Own -3%
Sell·S
Jun 15, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$28.0K

1.4K sh · $20.66

Own -3%
Sell·S
Jun 15, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$11.4K

550 sh · $20.66

Own -2%
Exercise·M
Jun 15, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$1.3K

550 sh · $2.39

Own +3%
Exercise·M
Jun 1, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$0

6.0K sh

Own +7%
Exercise·M
Jun 1, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$0

204 sh

Own New
Sell·S
Jun 1, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$5.8K

278 sh · $20.86

Own -14%
Sell·S
Jun 1, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$24.0K

1.2K sh · $20.86

Own -3%
Sell·S
Jun 1, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$28.3K

1.4K sh · $20.86

Own -3%
Sell·S
Jun 1, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$129.6K

6.2K sh · $20.86

Own -22%
Exercise·M
Jun 1, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$14.4K

6.0K sh · $2.39

Own +28%
Exercise·M
Jun 1, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$488

204 sh · $2.39

Own +1%
Grant·A
May 28, 26

Tiffany Olson

Director

$0

11.8K sh

Own New
Grant·A
May 28, 26

Ellen Goldberg

Director

$0

11.8K sh

Own New
Grant·A
May 28, 26

Miles Harrison

Director

$0

11.8K sh

Own New
Grant·A
May 28, 26

Rodney Cotton

Director

$0

11.8K sh

Own New
Grant·A
May 28, 26

Kim Caple

Director

$0

11.8K sh

Own New
Grant·A
May 28, 26

Bradley G Cole

Director

$0

11.8K sh

Own New
Grant·A
May 28, 26

Daniel Bradbury

Director

$0

11.8K sh

Own New
Grant·A
May 28, 26

Daniel Bradbury KEY

CHAIRMAN

$0

70.0K sh

Own New

Date▾	Insider	Role	Type	Shares	Own Δ	Price	Value
Jun 16, 2026	Kristen M Oelschlager 10b5-1	Chief Operating Officer	Sell S	8.6K	-22%	$20.71	$177.8K
Jun 15, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	550	+1%	—	$0
Jun 15, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	278	-2%	$20.66	$5.7K
Jun 15, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.2K	-3%	$20.66	$23.8K
Jun 15, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.4K	-3%	$20.66	$28.0K
Jun 15, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	550	-2%	$20.66	$11.4K
Jun 15, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	550	+3%	$2.39	$1.3K
Jun 1, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	6.0K	+7%	—	$0
Jun 1, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	204	New	—	$0
Jun 1, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	278	-14%	$20.86	$5.8K
Jun 1, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.2K	-3%	$20.86	$24.0K
Jun 1, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.4K	-3%	$20.86	$28.3K
Jun 1, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	6.2K	-22%	$20.86	$129.6K
Jun 1, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	6.0K	+28%	$2.39	$14.4K
Jun 1, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	204	+1%	$2.39	$488
May 28, 2026	Tiffany Olson	Director	Grant A	11.8K	New	—	$0
May 28, 2026	Ellen Goldberg	Director	Grant A	11.8K	New	—	$0
May 28, 2026	Miles Harrison	Director	Grant A	11.8K	New	—	$0
May 28, 2026	Rodney Cotton	Director	Grant A	11.8K	New	—	$0
May 28, 2026	Kim Caple	Director	Grant A	11.8K	New	—	$0
May 28, 2026	Bradley G Cole	Director	Grant A	11.8K	New	—	$0
May 28, 2026	Daniel Bradbury	Director	Grant A	11.8K	New	—	$0
May 28, 2026	Daniel Bradbury KEY	CHAIRMAN	Grant A	70.0K	New	—	$0

About CSTL insider trading

This page tracks insider transactions for CASTLE BIOSCIENCES INC (CSTL) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.