CSTL

insider transactions

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

30D 90D 1Y

Net shares · 365d

-195.9K

0 buy · 195.9K sell

Net value · 365d

-$5.1M

$0 in · $5.1M out

Sentiment · 365d

Net selling

0% buying · 100% selling

Open-market trades · 365d

0 buy · 195.9K 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
Exercise·M
May 22, 26

Miles Harrison

Director

$0

13.7K sh

Own New
Exercise·M
May 22, 26

Miles Harrison

Director

—

13.7K sh

Own +62%
Exercise·M
May 22, 26

Tiffany Olson

Director

$0

13.7K sh

Own New
Exercise·M
May 22, 26

Tiffany Olson

Director

—

13.7K sh

Own +53%
Exercise·M
May 22, 26

Ellen Goldberg

Director

$0

13.7K sh

Own New
Exercise·M
May 22, 26

Ellen Goldberg

Director

—

13.7K sh

Own +50%
Exercise·M
May 22, 26

Kim Caple

Director

$0

13.7K sh

Own New
Exercise·M
May 22, 26

Kim Caple

Director

—

13.7K sh

Own +61%
Exercise·M
May 22, 26

Rodney Cotton

Director

$0

13.7K sh

Own New
Exercise·M
May 22, 26

Rodney Cotton

Director

—

13.7K sh

Own +71%
Exercise·M
May 22, 26

Bradley G Cole

Director

$0

13.7K sh

Own New
Exercise·M
May 22, 26

Bradley G Cole

Director

—

13.7K sh

Own +71%
Exercise·M
May 22, 26

Daniel Bradbury

Director

$0

13.7K sh

Own New
Exercise·M
May 22, 26

Daniel Bradbury

Director

—

13.7K sh

Own +158%
Exercise·M
May 21, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$0

420 sh

Own New
Sell·S
May 21, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$4.3K

212 sh · $20.20

Own -10%
Sell·S
May 21, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$17.8K

880 sh · $20.20

Own -2%
Sell·S
May 21, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$20.9K

1.0K sh · $20.20

Own -2%
Sell·S
May 21, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$8.5K

420 sh · $20.20

Own -2%
Exercise·M
May 21, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$1.0K

420 sh · $2.39

Own +2%
Exercise·M
May 21, 26

Tobin W Juvenal

Chief Commercial Officer

$0

11.2K sh

Own New
Exercise·M
May 21, 26

Tobin W Juvenal

Chief Commercial Officer

$37.9K

11.2K sh · $3.38

Own +13%
Exercise·M
May 20, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$0

130 sh

Own +26%
Sell·S
May 20, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$1.3K

66 sh · $20.00

Own -3%
Sell·S
May 20, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$5.5K

273 sh · $20.00

Own -1%
Sell·S
May 20, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$6.4K

322 sh · $20.00

Own -1%
Sell·S
May 20, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$2.6K

130 sh · $20.00

Own -1%
Exercise·M
May 20, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$311

130 sh · $2.39

Own +1%
Exercise·M
May 7, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$0

6.2K sh

Own New
Sell·S
May 7, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$926

41 sh · $22.59

Own -2%
Sell·S
May 7, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$3.8K

168 sh · $22.59

Own -0%
Sell·S
May 7, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$4.5K

198 sh · $22.59

Own -0%
Sell·S
May 7, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$20.5K

906 sh · $22.59

Own -4%
Sell·S
May 7, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$5.2K

237 sh · $22.08

Own -9%
Sell·S
May 7, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$21.7K

985 sh · $22.08

Own -2%
Sell·S
May 7, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$25.6K

1.2K sh · $22.08

Own -2%
Sell·S
May 7, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$117.2K

5.3K sh · $22.08

Own -19%
Exercise·M
May 7, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$14.9K

6.2K sh · $2.39

Own +29%
Exercise·M
Apr 21, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$0

550 sh

Own +9%
Sell·S
Apr 21, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$7.0K

278 sh · $25.10

Own -10%
Sell·S
Apr 21, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$28.9K

1.2K sh · $25.10

Own -3%
Sell·S
Apr 21, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$34.1K

1.4K sh · $25.10

Own -3%
Sell·S
Apr 21, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$13.8K

550 sh · $25.10

Own -2%
Exercise·M
Apr 21, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$1.3K

550 sh · $2.39

Own +3%
Exercise·M
Apr 6, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$0

6.2K sh

Own +477%
Sell·S
Apr 6, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$7.0K

278 sh · $25.03

Own -9%
Sell·S
Apr 6, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$28.9K

1.2K sh · $25.03

Own -3%
Sell·S
Apr 6, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$34.0K

1.4K sh · $25.03

Own -3%
Sell·S
Apr 6, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$155.5K

6.2K sh · $25.03

Own -22%
Exercise·M
Apr 6, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$14.9K

6.2K sh · $2.39

Own +29%
Exercise·M
Mar 26, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$0

550 sh

Own +4%
Sell·S
Mar 26, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$7.1K

278 sh · $25.55

Own -8%
Sell·S
Mar 26, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$29.5K

1.2K sh · $25.55

Own -3%
Sell·S
Mar 26, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$34.7K

1.4K sh · $25.55

Own -3%
Sell·S
Mar 26, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$14.1K

550 sh · $25.55

Own -2%
Exercise·M
Mar 26, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$1.3K

550 sh · $2.39

Own +3%
Exercise·M
Mar 26, 26

Rodney Cotton

Director

$0

5.3K sh

Own +532900%
Exercise·M
Mar 26, 26

Rodney Cotton

Director

—

5.3K sh

Own +38%
Sell·S
Mar 18, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$16.5K

650 sh · $25.39

Own -3%
Sell·S
Mar 17, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$483.6K

18.6K sh · $25.93

Own -46%
Sell·S
Mar 16, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$3.4K

126 sh · $26.68

Own -0%
Sell·S
Mar 16, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$453.0K

17.4K sh · $25.96

Own -30%
Sell·S
Mar 13, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$336.0K

13.2K sh · $25.45

Own -18%
Sell·S
Mar 12, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$585.9K

23.2K sh · $25.28

Own -24%
Sell·S
Mar 12, 26

Tobin W Juvenal

Chief Commercial Officer · 10b5-1

$526.6K

20.9K sh · $25.24

Own -19%
Exercise·M
Mar 11, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$0

6.2K sh

Own +77%
Sell·S
Mar 11, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$7.3K

279 sh · $26.11

Own -8%
Sell·S
Mar 11, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$7.4K

282 sh · $26.11

Own -8%
Sell·S
Mar 11, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$30.3K

1.2K sh · $26.11

Own -3%
Sell·S
Mar 11, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$35.4K

1.4K sh · $26.11

Own -3%
Sell·S
Mar 11, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$451.9K

17.3K sh · $26.11

Own -15%
Exercise·M
Mar 11, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$14.9K

6.2K sh · $2.39

Own +6%
Sell·S
Mar 5, 26

Frank Stokes KEY

Chief Financial Officer · 10b5-1

$167.9K

6.0K sh · $27.98

Own -9%
Exercise·M
Mar 5, 26

Bradley G Cole

Director

$0

4.7K sh

Own +31%
Sell·S
Mar 5, 26

Bradley G Cole

Director

$75.7K

2.7K sh · $28.51

Own -12%
Sell·S
Mar 5, 26

Bradley G Cole

Director

$135.0K

4.7K sh · $28.44

Own -18%
Exercise·M
Mar 5, 26

Bradley G Cole

Director

$16.0K

4.7K sh · $3.38

Own +22%
Exercise·M
Mar 4, 26

Tobin W Juvenal

Chief Commercial Officer

$0

12.0K sh

Own +50%
Exercise·M
Mar 4, 26

Tobin W Juvenal

Chief Commercial Officer

$0

13.8K sh

Own +100%
Other·F
Mar 4, 26

Tobin W Juvenal

Chief Commercial Officer

$292.9K

10.4K sh · $28.17

Own -9%
Exercise·M
Mar 4, 26

Tobin W Juvenal

Chief Commercial Officer

—

25.8K sh

Own +28%
Exercise·M
Mar 4, 26

Kristen M Oelschlager

Chief Operating Officer

$0

12.0K sh

Own +50%
Exercise·M
Mar 4, 26

Kristen M Oelschlager

Chief Operating Officer

$0

13.8K sh

Own +100%
Other·F
Mar 4, 26

Kristen M Oelschlager

Chief Operating Officer

$191.3K

6.8K sh · $28.17

Own -15%
Exercise·M
Mar 4, 26

Kristen M Oelschlager

Chief Operating Officer

—

25.8K sh

Own +128%
Exercise·M
Mar 4, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer

$0

28.0K sh

Own +50%
Exercise·M
Mar 4, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer

$0

31.1K sh

Own +100%
Other·F
Mar 4, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer

$505.1K

17.9K sh · $28.17

Own -14%
Exercise·M
Mar 4, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer

—

59.1K sh

Own +91%
Exercise·M
Mar 4, 26

Frank Stokes KEY

Chief Financial Officer · 10b5-1

$0

3.8K sh

Own +34%
Exercise·M
Mar 4, 26

Frank Stokes KEY

Chief Financial Officer · 10b5-1

$0

12.0K sh

Own +50%
Exercise·M
Mar 4, 26

Frank Stokes KEY

Chief Financial Officer · 10b5-1

$0

12.2K sh

Own +100%
Exercise·M
Mar 4, 26

Frank Stokes KEY

Chief Financial Officer · 10b5-1

$12.8K

3.8K sh · $3.38

Own +6%
Other·F
Mar 4, 26

Frank Stokes KEY

Chief Financial Officer · 10b5-1

$302.3K

10.7K sh · $28.17

Own -15%
Exercise·M
Mar 4, 26

Frank Stokes KEY

Chief Financial Officer · 10b5-1

—

24.1K sh

Own +49%
Grant·A
Mar 3, 26

Tobin W Juvenal

Chief Commercial Officer

$0

48.4K sh

Own New
Other·F
Mar 3, 26

Tobin W Juvenal

Chief Commercial Officer

$102.5K

3.7K sh · $27.57

Own -4%
Grant·A
Mar 3, 26

Kristen M Oelschlager

Chief Operating Officer

$0

48.4K sh

Own New
Other·F
Mar 3, 26

Kristen M Oelschlager

Chief Operating Officer

$66.9K

2.4K sh · $27.57

Own -11%
Grant·A
Mar 3, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer

$0

102.6K sh

Own New
Other·F
Mar 3, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer

$525.0K

19.0K sh · $27.57

Own -23%
Grant·A
Mar 3, 26

Frank Stokes KEY

Chief Financial Officer · 10b5-1

$0

48.4K sh

Own New
Other·F
Mar 3, 26

Frank Stokes KEY

Chief Financial Officer · 10b5-1

$99.6K

3.6K sh · $27.57

Own -7%
Sell·S
Mar 3, 26

Frank Stokes KEY

Chief Financial Officer · 10b5-1

$47.3K

1.7K sh · $27.81

Own -3%
Sell·S
Mar 3, 26

Frank Stokes KEY

Chief Financial Officer · 10b5-1

$144.8K

5.3K sh · $27.32

Own -9%
Sell·S
Feb 4, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$6.6K

171 sh · $38.61

Own -0%
Sell·S
Feb 4, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$24.4K

646 sh · $37.82

Own -1%
Sell·S
Feb 3, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$127.7K

3.2K sh · $39.91

Own -4%
Sell·S
Jan 20, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$160.7K

4.0K sh · $40.01

Own -4%
Grant·A
Jan 12, 26

Kristen M Oelschlager

Chief Operating Officer

$0

9.2K sh

Own New
Grant·A
Jan 12, 26

Kristen M Oelschlager

Chief Operating Officer

$0

9.2K sh

Own +75%
Grant·A
Jan 12, 26

Tobin W Juvenal

Chief Commercial Officer

$0

9.2K sh

Own New
Grant·A
Jan 12, 26

Tobin W Juvenal

Chief Commercial Officer

$0

9.2K sh

Own +11%
Grant·A
Jan 12, 26

Frank Stokes KEY

Chief Financial Officer

$0

8.1K sh

Own New
Grant·A
Jan 12, 26

Frank Stokes KEY

Chief Financial Officer

$0

8.1K sh

Own +16%
Grant·A
Jan 12, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer

$0

62.2K sh

Own New
Grant·A
Jan 12, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer

$0

62.2K sh

Own +211%
Sell·S
Jan 6, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$53.7K

1.3K sh · $40.10

Own -4%
Sell·S
Jan 5, 26

Derek J Maetzold KEY

Pres. & Chief Exec. Officer · 10b5-1

$102.0K

2.7K sh · $38.09

Own -8%
Grant·A
Jan 1, 26

Daniel Bradbury

Director

$58.1K

47.2K sh · $1.23

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
May 22, 2026	Miles Harrison	Director	Exercise M	13.7K	New	—	$0
May 22, 2026	Miles Harrison	Director	Exercise M	13.7K	+62%	—	—
May 22, 2026	Tiffany Olson	Director	Exercise M	13.7K	New	—	$0
May 22, 2026	Tiffany Olson	Director	Exercise M	13.7K	+53%	—	—
May 22, 2026	Ellen Goldberg	Director	Exercise M	13.7K	New	—	$0
May 22, 2026	Ellen Goldberg	Director	Exercise M	13.7K	+50%	—	—
May 22, 2026	Kim Caple	Director	Exercise M	13.7K	New	—	$0
May 22, 2026	Kim Caple	Director	Exercise M	13.7K	+61%	—	—
May 22, 2026	Rodney Cotton	Director	Exercise M	13.7K	New	—	$0
May 22, 2026	Rodney Cotton	Director	Exercise M	13.7K	+71%	—	—
May 22, 2026	Bradley G Cole	Director	Exercise M	13.7K	New	—	$0
May 22, 2026	Bradley G Cole	Director	Exercise M	13.7K	+71%	—	—
May 22, 2026	Daniel Bradbury	Director	Exercise M	13.7K	New	—	$0
May 22, 2026	Daniel Bradbury	Director	Exercise M	13.7K	+158%	—	—
May 21, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	420	New	—	$0
May 21, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	212	-10%	$20.20	$4.3K
May 21, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	880	-2%	$20.20	$17.8K
May 21, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.0K	-2%	$20.20	$20.9K
May 21, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	420	-2%	$20.20	$8.5K
May 21, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	420	+2%	$2.39	$1.0K
May 21, 2026	Tobin W Juvenal	Chief Commercial Officer	Exercise M	11.2K	New	—	$0
May 21, 2026	Tobin W Juvenal	Chief Commercial Officer	Exercise M	11.2K	+13%	$3.38	$37.9K
May 20, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	130	+26%	—	$0
May 20, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	66	-3%	$20.00	$1.3K
May 20, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	273	-1%	$20.00	$5.5K
May 20, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	322	-1%	$20.00	$6.4K
May 20, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	130	-1%	$20.00	$2.6K
May 20, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	130	+1%	$2.39	$311
May 7, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	6.2K	New	—	$0
May 7, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	41	-2%	$22.59	$926
May 7, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	168	-0%	$22.59	$3.8K
May 7, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	198	-0%	$22.59	$4.5K
May 7, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	906	-4%	$22.59	$20.5K
May 7, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	237	-9%	$22.08	$5.2K
May 7, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	985	-2%	$22.08	$21.7K
May 7, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.2K	-2%	$22.08	$25.6K
May 7, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	5.3K	-19%	$22.08	$117.2K
May 7, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	6.2K	+29%	$2.39	$14.9K
Apr 21, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	550	+9%	—	$0
Apr 21, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	278	-10%	$25.10	$7.0K
Apr 21, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.2K	-3%	$25.10	$28.9K
Apr 21, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.4K	-3%	$25.10	$34.1K
Apr 21, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	550	-2%	$25.10	$13.8K
Apr 21, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	550	+3%	$2.39	$1.3K
Apr 6, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	6.2K	+477%	—	$0
Apr 6, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	278	-9%	$25.03	$7.0K
Apr 6, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.2K	-3%	$25.03	$28.9K
Apr 6, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.4K	-3%	$25.03	$34.0K
Apr 6, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	6.2K	-22%	$25.03	$155.5K
Apr 6, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	6.2K	+29%	$2.39	$14.9K
Mar 26, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	550	+4%	—	$0
Mar 26, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	278	-8%	$25.55	$7.1K
Mar 26, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.2K	-3%	$25.55	$29.5K
Mar 26, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.4K	-3%	$25.55	$34.7K
Mar 26, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	550	-2%	$25.55	$14.1K
Mar 26, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	550	+3%	$2.39	$1.3K
Mar 26, 2026	Rodney Cotton	Director	Exercise M	5.3K	+532900%	—	$0
Mar 26, 2026	Rodney Cotton	Director	Exercise M	5.3K	+38%	—	—
Mar 18, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	650	-3%	$25.39	$16.5K
Mar 17, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	18.6K	-46%	$25.93	$483.6K
Mar 16, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	126	-0%	$26.68	$3.4K
Mar 16, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	17.4K	-30%	$25.96	$453.0K
Mar 13, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	13.2K	-18%	$25.45	$336.0K
Mar 12, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	23.2K	-24%	$25.28	$585.9K
Mar 12, 2026	Tobin W Juvenal 10b5-1	Chief Commercial Officer	Sell S	20.9K	-19%	$25.24	$526.6K
Mar 11, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	6.2K	+77%	—	$0
Mar 11, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	279	-8%	$26.11	$7.3K
Mar 11, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	282	-8%	$26.11	$7.4K
Mar 11, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.2K	-3%	$26.11	$30.3K
Mar 11, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.4K	-3%	$26.11	$35.4K
Mar 11, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	17.3K	-15%	$26.11	$451.9K
Mar 11, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Exercise M	6.2K	+6%	$2.39	$14.9K
Mar 5, 2026	Frank Stokes KEY 10b5-1	Chief Financial Officer	Sell S	6.0K	-9%	$27.98	$167.9K
Mar 5, 2026	Bradley G Cole	Director	Exercise M	4.7K	+31%	—	$0
Mar 5, 2026	Bradley G Cole	Director	Sell S	2.7K	-12%	$28.51	$75.7K
Mar 5, 2026	Bradley G Cole	Director	Sell S	4.7K	-18%	$28.44	$135.0K
Mar 5, 2026	Bradley G Cole	Director	Exercise M	4.7K	+22%	$3.38	$16.0K
Mar 4, 2026	Tobin W Juvenal	Chief Commercial Officer	Exercise M	12.0K	+50%	—	$0
Mar 4, 2026	Tobin W Juvenal	Chief Commercial Officer	Exercise M	13.8K	+100%	—	$0
Mar 4, 2026	Tobin W Juvenal	Chief Commercial Officer	Other F	10.4K	-9%	$28.17	$292.9K
Mar 4, 2026	Tobin W Juvenal	Chief Commercial Officer	Exercise M	25.8K	+28%	—	—
Mar 4, 2026	Kristen M Oelschlager	Chief Operating Officer	Exercise M	12.0K	+50%	—	$0
Mar 4, 2026	Kristen M Oelschlager	Chief Operating Officer	Exercise M	13.8K	+100%	—	$0
Mar 4, 2026	Kristen M Oelschlager	Chief Operating Officer	Other F	6.8K	-15%	$28.17	$191.3K
Mar 4, 2026	Kristen M Oelschlager	Chief Operating Officer	Exercise M	25.8K	+128%	—	—
Mar 4, 2026	Derek J Maetzold KEY	Pres. & Chief Exec. Officer	Exercise M	28.0K	+50%	—	$0
Mar 4, 2026	Derek J Maetzold KEY	Pres. & Chief Exec. Officer	Exercise M	31.1K	+100%	—	$0
Mar 4, 2026	Derek J Maetzold KEY	Pres. & Chief Exec. Officer	Other F	17.9K	-14%	$28.17	$505.1K
Mar 4, 2026	Derek J Maetzold KEY	Pres. & Chief Exec. Officer	Exercise M	59.1K	+91%	—	—
Mar 4, 2026	Frank Stokes KEY 10b5-1	Chief Financial Officer	Exercise M	3.8K	+34%	—	$0
Mar 4, 2026	Frank Stokes KEY 10b5-1	Chief Financial Officer	Exercise M	12.0K	+50%	—	$0
Mar 4, 2026	Frank Stokes KEY 10b5-1	Chief Financial Officer	Exercise M	12.2K	+100%	—	$0
Mar 4, 2026	Frank Stokes KEY 10b5-1	Chief Financial Officer	Exercise M	3.8K	+6%	$3.38	$12.8K
Mar 4, 2026	Frank Stokes KEY 10b5-1	Chief Financial Officer	Other F	10.7K	-15%	$28.17	$302.3K
Mar 4, 2026	Frank Stokes KEY 10b5-1	Chief Financial Officer	Exercise M	24.1K	+49%	—	—
Mar 3, 2026	Tobin W Juvenal	Chief Commercial Officer	Grant A	48.4K	New	—	$0
Mar 3, 2026	Tobin W Juvenal	Chief Commercial Officer	Other F	3.7K	-4%	$27.57	$102.5K
Mar 3, 2026	Kristen M Oelschlager	Chief Operating Officer	Grant A	48.4K	New	—	$0
Mar 3, 2026	Kristen M Oelschlager	Chief Operating Officer	Other F	2.4K	-11%	$27.57	$66.9K
Mar 3, 2026	Derek J Maetzold KEY	Pres. & Chief Exec. Officer	Grant A	102.6K	New	—	$0
Mar 3, 2026	Derek J Maetzold KEY	Pres. & Chief Exec. Officer	Other F	19.0K	-23%	$27.57	$525.0K
Mar 3, 2026	Frank Stokes KEY 10b5-1	Chief Financial Officer	Grant A	48.4K	New	—	$0
Mar 3, 2026	Frank Stokes KEY 10b5-1	Chief Financial Officer	Other F	3.6K	-7%	$27.57	$99.6K
Mar 3, 2026	Frank Stokes KEY 10b5-1	Chief Financial Officer	Sell S	1.7K	-3%	$27.81	$47.3K
Mar 3, 2026	Frank Stokes KEY 10b5-1	Chief Financial Officer	Sell S	5.3K	-9%	$27.32	$144.8K
Feb 4, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	171	-0%	$38.61	$6.6K
Feb 4, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	646	-1%	$37.82	$24.4K
Feb 3, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	3.2K	-4%	$39.91	$127.7K
Jan 20, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	4.0K	-4%	$40.01	$160.7K
Jan 12, 2026	Kristen M Oelschlager	Chief Operating Officer	Grant A	9.2K	New	—	$0
Jan 12, 2026	Kristen M Oelschlager	Chief Operating Officer	Grant A	9.2K	+75%	—	$0
Jan 12, 2026	Tobin W Juvenal	Chief Commercial Officer	Grant A	9.2K	New	—	$0
Jan 12, 2026	Tobin W Juvenal	Chief Commercial Officer	Grant A	9.2K	+11%	—	$0
Jan 12, 2026	Frank Stokes KEY	Chief Financial Officer	Grant A	8.1K	New	—	$0
Jan 12, 2026	Frank Stokes KEY	Chief Financial Officer	Grant A	8.1K	+16%	—	$0
Jan 12, 2026	Derek J Maetzold KEY	Pres. & Chief Exec. Officer	Grant A	62.2K	New	—	$0
Jan 12, 2026	Derek J Maetzold KEY	Pres. & Chief Exec. Officer	Grant A	62.2K	+211%	—	$0
Jan 6, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	1.3K	-4%	$40.10	$53.7K
Jan 5, 2026	Derek J Maetzold KEY 10b5-1	Pres. & Chief Exec. Officer	Sell S	2.7K	-8%	$38.09	$102.0K
Jan 1, 2026	Daniel Bradbury	Director	Grant A	47.2K	New	$1.23	$58.1K

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.