Derek J Maetzold

Insider

Pres. & Chief Exec. Officer

Trades at: CSTL

30D 90D 1Y

Net shares · 90d

-40.4K

0 buy · 40.4K sell

Net value · 90d

-$917.8K

$0 in · $917.8K out

Sentiment · 90d

Net selling

0% buying · 100% selling

Open-market trades · 90d

0 buy · 40.4K sell

Net buy / sell volume (all companies)

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

All transactions

Show open-market only

CSTL Exercise·M
Jun 15, 26

Pres. & Chief Exec. Officer · 10b5-1

$0

550 sh

Own +1%
CSTL Sell·S
Jun 15, 26

Pres. & Chief Exec. Officer · 10b5-1

$5.7K

278 sh · $20.66

Own -2%
CSTL Sell·S
Jun 15, 26

Pres. & Chief Exec. Officer · 10b5-1

$23.8K

1.2K sh · $20.66

Own -3%
CSTL Sell·S
Jun 15, 26

Pres. & Chief Exec. Officer · 10b5-1

$28.0K

1.4K sh · $20.66

Own -3%
CSTL Sell·S
Jun 15, 26

Pres. & Chief Exec. Officer · 10b5-1

$11.4K

550 sh · $20.66

Own -2%
CSTL Exercise·M
Jun 15, 26

Pres. & Chief Exec. Officer · 10b5-1

$1.3K

550 sh · $2.39

Own +3%
CSTL Exercise·M
Jun 1, 26

Pres. & Chief Exec. Officer · 10b5-1

$0

6.0K sh

Own +7%
CSTL Exercise·M
Jun 1, 26

Pres. & Chief Exec. Officer · 10b5-1

$0

204 sh

Own New
CSTL Sell·S
Jun 1, 26

Pres. & Chief Exec. Officer · 10b5-1

$5.8K

278 sh · $20.86

Own -14%
CSTL Sell·S
Jun 1, 26

Pres. & Chief Exec. Officer · 10b5-1

$24.0K

1.2K sh · $20.86

Own -3%
CSTL Sell·S
Jun 1, 26

Pres. & Chief Exec. Officer · 10b5-1

$28.3K

1.4K sh · $20.86

Own -3%
CSTL Sell·S
Jun 1, 26

Pres. & Chief Exec. Officer · 10b5-1

$129.6K

6.2K sh · $20.86

Own -22%
CSTL Exercise·M
Jun 1, 26

Pres. & Chief Exec. Officer · 10b5-1

$14.4K

6.0K sh · $2.39

Own +28%
CSTL Exercise·M
Jun 1, 26

Pres. & Chief Exec. Officer · 10b5-1

$488

204 sh · $2.39

Own +1%
CSTL Exercise·M
May 21, 26

Pres. & Chief Exec. Officer · 10b5-1

$0

420 sh

Own New
CSTL Sell·S
May 21, 26

Pres. & Chief Exec. Officer · 10b5-1

$4.3K

212 sh · $20.20

Own -10%
CSTL Sell·S
May 21, 26

Pres. & Chief Exec. Officer · 10b5-1

$17.8K

880 sh · $20.20

Own -2%
CSTL Sell·S
May 21, 26

Pres. & Chief Exec. Officer · 10b5-1

$20.9K

1.0K sh · $20.20

Own -2%
CSTL Sell·S
May 21, 26

Pres. & Chief Exec. Officer · 10b5-1

$8.5K

420 sh · $20.20

Own -2%
CSTL Exercise·M
May 21, 26

Pres. & Chief Exec. Officer · 10b5-1

$1.0K

420 sh · $2.39

Own +2%
CSTL Exercise·M
May 20, 26

Pres. & Chief Exec. Officer · 10b5-1

$0

130 sh

Own +26%
CSTL Sell·S
May 20, 26

Pres. & Chief Exec. Officer · 10b5-1

$1.3K

66 sh · $20.00

Own -3%
CSTL Sell·S
May 20, 26

Pres. & Chief Exec. Officer · 10b5-1

$5.5K

273 sh · $20.00

Own -1%
CSTL Sell·S
May 20, 26

Pres. & Chief Exec. Officer · 10b5-1

$6.4K

322 sh · $20.00

Own -1%
CSTL Sell·S
May 20, 26

Pres. & Chief Exec. Officer · 10b5-1

$2.6K

130 sh · $20.00

Own -1%
CSTL Exercise·M
May 20, 26

Pres. & Chief Exec. Officer · 10b5-1

$311

130 sh · $2.39

Own +1%
CSTL Exercise·M
May 7, 26

Pres. & Chief Exec. Officer · 10b5-1

$0

6.2K sh

Own New
CSTL Sell·S
May 7, 26

Pres. & Chief Exec. Officer · 10b5-1

$926

41 sh · $22.59

Own -2%
CSTL Sell·S
May 7, 26

Pres. & Chief Exec. Officer · 10b5-1

$3.8K

168 sh · $22.59

Own -0%
CSTL Sell·S
May 7, 26

Pres. & Chief Exec. Officer · 10b5-1

$4.5K

198 sh · $22.59

Own -0%
CSTL Sell·S
May 7, 26

Pres. & Chief Exec. Officer · 10b5-1

$20.5K

906 sh · $22.59

Own -4%
CSTL Sell·S
May 7, 26

Pres. & Chief Exec. Officer · 10b5-1

$5.2K

237 sh · $22.08

Own -9%
CSTL Sell·S
May 7, 26

Pres. & Chief Exec. Officer · 10b5-1

$21.7K

985 sh · $22.08

Own -2%
CSTL Sell·S
May 7, 26

Pres. & Chief Exec. Officer · 10b5-1

$25.6K

1.2K sh · $22.08

Own -2%
CSTL Sell·S
May 7, 26

Pres. & Chief Exec. Officer · 10b5-1

$117.2K

5.3K sh · $22.08

Own -19%
CSTL Exercise·M
May 7, 26

Pres. & Chief Exec. Officer · 10b5-1

$14.9K

6.2K sh · $2.39

Own +29%
CSTL Exercise·M
Apr 21, 26

Pres. & Chief Exec. Officer · 10b5-1

$0

550 sh

Own +9%
CSTL Sell·S
Apr 21, 26

Pres. & Chief Exec. Officer · 10b5-1

$7.0K

278 sh · $25.10

Own -10%
CSTL Sell·S
Apr 21, 26

Pres. & Chief Exec. Officer · 10b5-1

$28.9K

1.2K sh · $25.10

Own -3%
CSTL Sell·S
Apr 21, 26

Pres. & Chief Exec. Officer · 10b5-1

$34.1K

1.4K sh · $25.10

Own -3%
CSTL Sell·S
Apr 21, 26

Pres. & Chief Exec. Officer · 10b5-1

$13.8K

550 sh · $25.10

Own -2%
CSTL Exercise·M
Apr 21, 26

Pres. & Chief Exec. Officer · 10b5-1

$1.3K

550 sh · $2.39

Own +3%
CSTL Exercise·M
Apr 6, 26

Pres. & Chief Exec. Officer · 10b5-1

$0

6.2K sh

Own +477%
CSTL Sell·S
Apr 6, 26

Pres. & Chief Exec. Officer · 10b5-1

$7.0K

278 sh · $25.03

Own -9%
CSTL Sell·S
Apr 6, 26

Pres. & Chief Exec. Officer · 10b5-1

$28.9K

1.2K sh · $25.03

Own -3%
CSTL Sell·S
Apr 6, 26

Pres. & Chief Exec. Officer · 10b5-1

$34.0K

1.4K sh · $25.03

Own -3%
CSTL Sell·S
Apr 6, 26

Pres. & Chief Exec. Officer · 10b5-1

$155.5K

6.2K sh · $25.03

Own -22%
CSTL Exercise·M
Apr 6, 26

Pres. & Chief Exec. Officer · 10b5-1

$14.9K

6.2K sh · $2.39

Own +29%
CSTL Exercise·M
Mar 26, 26

Pres. & Chief Exec. Officer · 10b5-1

$0

550 sh

Own +4%
CSTL Sell·S
Mar 26, 26

Pres. & Chief Exec. Officer · 10b5-1

$7.1K

278 sh · $25.55

Own -8%
CSTL Sell·S
Mar 26, 26

Pres. & Chief Exec. Officer · 10b5-1

$29.5K

1.2K sh · $25.55

Own -3%
CSTL Sell·S
Mar 26, 26

Pres. & Chief Exec. Officer · 10b5-1

$34.7K

1.4K sh · $25.55

Own -3%
CSTL Sell·S
Mar 26, 26

Pres. & Chief Exec. Officer · 10b5-1

$14.1K

550 sh · $25.55

Own -2%
CSTL Exercise·M
Mar 26, 26

Pres. & Chief Exec. Officer · 10b5-1

$1.3K

550 sh · $2.39

Own +3%

Date▾	Ticker	Role	Type	Shares	Own Δ	Price	Value
Jun 15, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	550	+1%	—	$0
Jun 15, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	278	-2%	$20.66	$5.7K
Jun 15, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	1.2K	-3%	$20.66	$23.8K
Jun 15, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	1.4K	-3%	$20.66	$28.0K
Jun 15, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	550	-2%	$20.66	$11.4K
Jun 15, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	550	+3%	$2.39	$1.3K
Jun 1, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	6.0K	+7%	—	$0
Jun 1, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	204	New	—	$0
Jun 1, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	278	-14%	$20.86	$5.8K
Jun 1, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	1.2K	-3%	$20.86	$24.0K
Jun 1, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	1.4K	-3%	$20.86	$28.3K
Jun 1, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	6.2K	-22%	$20.86	$129.6K
Jun 1, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	6.0K	+28%	$2.39	$14.4K
Jun 1, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	204	+1%	$2.39	$488
May 21, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	420	New	—	$0
May 21, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	212	-10%	$20.20	$4.3K
May 21, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	880	-2%	$20.20	$17.8K
May 21, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	1.0K	-2%	$20.20	$20.9K
May 21, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	420	-2%	$20.20	$8.5K
May 21, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	420	+2%	$2.39	$1.0K
May 20, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	130	+26%	—	$0
May 20, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	66	-3%	$20.00	$1.3K
May 20, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	273	-1%	$20.00	$5.5K
May 20, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	322	-1%	$20.00	$6.4K
May 20, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	130	-1%	$20.00	$2.6K
May 20, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	130	+1%	$2.39	$311
May 7, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	6.2K	New	—	$0
May 7, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	41	-2%	$22.59	$926
May 7, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	168	-0%	$22.59	$3.8K
May 7, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	198	-0%	$22.59	$4.5K
May 7, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	906	-4%	$22.59	$20.5K
May 7, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	237	-9%	$22.08	$5.2K
May 7, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	985	-2%	$22.08	$21.7K
May 7, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	1.2K	-2%	$22.08	$25.6K
May 7, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	5.3K	-19%	$22.08	$117.2K
May 7, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	6.2K	+29%	$2.39	$14.9K
Apr 21, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	550	+9%	—	$0
Apr 21, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	278	-10%	$25.10	$7.0K
Apr 21, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	1.2K	-3%	$25.10	$28.9K
Apr 21, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	1.4K	-3%	$25.10	$34.1K
Apr 21, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	550	-2%	$25.10	$13.8K
Apr 21, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	550	+3%	$2.39	$1.3K
Apr 6, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	6.2K	+477%	—	$0
Apr 6, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	278	-9%	$25.03	$7.0K
Apr 6, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	1.2K	-3%	$25.03	$28.9K
Apr 6, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	1.4K	-3%	$25.03	$34.0K
Apr 6, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	6.2K	-22%	$25.03	$155.5K
Apr 6, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	6.2K	+29%	$2.39	$14.9K
Mar 26, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	550	+4%	—	$0
Mar 26, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	278	-8%	$25.55	$7.1K
Mar 26, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	1.2K	-3%	$25.55	$29.5K
Mar 26, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	1.4K	-3%	$25.55	$34.7K
Mar 26, 2026	CSTL	Pres. & Chief Exec. Officer	Sell S	550	-2%	$25.55	$14.1K
Mar 26, 2026	CSTL	Pres. & Chief Exec. Officer	Exercise M	550	+3%	$2.39	$1.3K

About Derek J Maetzold

This profile aggregates every SEC Form 4 insider transaction reported by Derek J Maetzold across all companies they trade. Open-market purchases (code P) and sales (code S) are the highest-signal, discretionary trades; grants (A), option exercises (M) and gifts (G) reflect compensation rather than conviction and carry no market price. Figures cover the selected period and update as new filings are ingested.