Understand Stock

$CSTL

$24.72 +$0.87 (3.65%)

Deep Research with AI Research

Overview

$CSTL Overview Financials SEC Filings Executives News

Specialized Tools

Valuations P Insider Transactions P Congressional Trades P

Insider Transactions

Insider Transaction Summary

DAVID S KABAKOFF

503,577 shares

Net: 0 B/S: -

Joseph C. III Cook

124,407 shares

Net: 0 B/S: -

Tobin W Juvenal

98,035 shares

Net: +65,223 B/S: 3.31

Frank Stokes

60,085 shares

Net: +61,991 B/S: 5.25

Kristen M Oelschlager

45,839 shares

Net: +14,338 B/S: 1.41

Mara G. Aspinall

44,139 shares

Net: 0 B/S: -

DEREK J MAETZOLD

21,479 shares

Net: +50,835 B/S: 1.57

Bernhard E. Spiess

14,696 shares

Net: 0 B/S: -

Rodney Cotton

11,766 shares

Net: +30,762 B/S: ∞

Kim Caple

11,766 shares

Net: +25,433 B/S: ∞

Ellen Goldberg

11,766 shares

Net: +25,433 B/S: ∞

Miles Harrison

11,766 shares

Net: +25,433 B/S: ∞

Tiffany Olson

11,766 shares

Net: +25,433 B/S: ∞

G Bradley Cole

11,766 shares

Net: +25,433 B/S: 6.36

DANIEL BRADBURY

11,766 shares

Net: +25,433 B/S: ∞

Insider Name	Current Shares	Net Change (1yr)	Buy/Sell Ratio
DAVID S KABAKOFF	503,577	0	-
Joseph C. III Cook	124,407	0	-
Tobin W Juvenal	98,035	+65,223	3.31
Frank Stokes	60,085	+61,991	5.25
Kristen M Oelschlager	45,839	+14,338	1.41
Mara G. Aspinall	44,139	0	-
DEREK J MAETZOLD	21,479	+50,835	1.57
Bernhard E. Spiess	14,696	0	-
Rodney Cotton	11,766	+30,762	∞
Kim Caple	11,766	+25,433	∞
Ellen Goldberg	11,766	+25,433	∞
Miles Harrison	11,766	+25,433	∞
Tiffany Olson	11,766	+25,433	∞
G Bradley Cole	11,766	+25,433	6.36
DANIEL BRADBURY	11,766	+25,433	∞

Individual Transactions

June 01, 2026

DEREK J MAETZOLD

Option Exercise/Conversion

Change: +204

Price: $2.39

Shares: 21,683

Value: +$487

DEREK J MAETZOLD

Open Market Sale

Change: -6,214

Price: $20.86

Shares: 21,479

Value: -$129,605

Insider	Filing Date	Transaction	Shares	Change	Price	Value
DEREK J MAETZOLD	Jun 03	Option Exercise/Conversion (M) Compensation/Award	21,683	+204	$2.39	+$487
DEREK J MAETZOLD	Jun 03	Open Market Sale (S) Market Sale	21,479	-6,214	$20.86	-$129,605

May 28, 2026

DANIEL BRADBURY

Grant/Award Acquisition

Change: +11,766

Price: $0.00

Shares: 11,766

Value: +$0

G Bradley Cole

Grant/Award Acquisition

Change: +11,766

Price: $0.00

Shares: 11,766

Value: +$0

Tiffany Olson

Grant/Award Acquisition

Change: +11,766

Price: $0.00

Shares: 11,766

Value: +$0

Kim Caple

Grant/Award Acquisition

Change: +11,766

Price: $0.00

Shares: 11,766

Value: +$0

Rodney Cotton

Grant/Award Acquisition

Change: +11,766

Price: $0.00

Shares: 11,766

Value: +$0

Miles Harrison

Grant/Award Acquisition

Change: +11,766

Price: $0.00

Shares: 11,766

Value: +$0

Ellen Goldberg

Grant/Award Acquisition

Change: +11,766

Price: $0.00

Shares: 11,766

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
DANIEL BRADBURY	Jun 01	Grant/Award Acquisition (A) Compensation/Award	11,766	+11,766	$0.00	+$0
G Bradley Cole	Jun 01	Grant/Award Acquisition (A) Compensation/Award	11,766	+11,766	$0.00	+$0
Tiffany Olson	Jun 01	Grant/Award Acquisition (A) Compensation/Award	11,766	+11,766	$0.00	+$0
Kim Caple	Jun 01	Grant/Award Acquisition (A) Compensation/Award	11,766	+11,766	$0.00	+$0
Rodney Cotton	Jun 01	Grant/Award Acquisition (A) Compensation/Award	11,766	+11,766	$0.00	+$0
Miles Harrison	Jun 01	Grant/Award Acquisition (A) Compensation/Award	11,766	+11,766	$0.00	+$0
Ellen Goldberg	Jun 01	Grant/Award Acquisition (A) Compensation/Award	11,766	+11,766	$0.00	+$0

May 22, 2026

DANIEL BRADBURY

Option Exercise/Conversion

Change: +13,667

Price: $0.00

Shares: 22,340

Value: +$0

G Bradley Cole

Option Exercise/Conversion

Change: +13,667

Price: $0.00

Shares: 32,976

Value: +$0

Tiffany Olson

Option Exercise/Conversion

Change: +13,667

Price: $0.00

Shares: 39,573

Value: +$0

Rodney Cotton

Option Exercise/Conversion

Change: +13,667

Price: $0.00

Shares: 32,998

Value: +$0

Kim Caple

Option Exercise/Conversion

Change: +13,667

Price: $0.00

Shares: 36,121

Value: +$0

Ellen Goldberg

Option Exercise/Conversion

Change: +13,667

Price: $0.00

Shares: 40,921

Value: +$0

Miles Harrison

Option Exercise/Conversion

Change: +13,667

Price: $0.00

Shares: 35,631

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
DANIEL BRADBURY	May 27	Option Exercise/Conversion (M) Compensation/Award	22,340	+13,667	$0.00	+$0
G Bradley Cole	May 27	Option Exercise/Conversion (M) Compensation/Award	32,976	+13,667	$0.00	+$0
Tiffany Olson	May 27	Option Exercise/Conversion (M) Compensation/Award	39,573	+13,667	$0.00	+$0
Rodney Cotton	May 27	Option Exercise/Conversion (M) Compensation/Award	32,998	+13,667	$0.00	+$0
Kim Caple	May 27	Option Exercise/Conversion (M) Compensation/Award	36,121	+13,667	$0.00	+$0
Ellen Goldberg	May 27	Option Exercise/Conversion (M) Compensation/Award	40,921	+13,667	$0.00	+$0
Miles Harrison	May 27	Option Exercise/Conversion (M) Compensation/Award	35,631	+13,667	$0.00	+$0

May 21, 2026

DEREK J MAETZOLD

Option Exercise/Conversion

Change: +420

Price: $2.39

Shares: 21,899

Value: +$1,003

Tobin W Juvenal

Option Exercise/Conversion

Change: +11,210

Price: $3.38

Shares: 98,035

Value: +$37,889

DEREK J MAETZOLD

Open Market Sale

Change: -420

Price: $20.20

Shares: 21,479

Value: -$8,482

Insider	Filing Date	Transaction	Shares	Change	Price	Value
DEREK J MAETZOLD	May 22	Option Exercise/Conversion (M) Compensation/Award	21,899	+420	$2.39	+$1,003
Tobin W Juvenal	May 26	Option Exercise/Conversion (M) Compensation/Award	98,035	+11,210	$3.38	+$37,889
DEREK J MAETZOLD	May 22	Open Market Sale (S) Market Sale	21,479	-420	$20.20	-$8,482

May 20, 2026

DEREK J MAETZOLD

Open Market Sale

Change: -130

Price: $20.00

Shares: 21,479

Value: -$2,600

Insider	Filing Date	Transaction	Shares	Change	Price	Value
DEREK J MAETZOLD	May 22	Open Market Sale (S) Market Sale	21,479	-130	$20.00	-$2,600