Castle Biosciences Ownership & Insider Activity

Castle Biosciences Inc

CSTLNASDAQ

Trade with Public

$33.50

-0.76-2.22%

At close: Aug 28, 5:00 PM EST

$33.50

N/A

After Hours: 4:00 PM EST

Overview News Earnings Forecast Events Price Targets Financials SentimentOwnershipCompare Options Stock Report

Castle Biosciences Ownership & Insider Activity

Castle Biosciences (CSTL) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 2.2% of shares outstanding. Institutional investors hold 53.8%. Over the past 90 days, insiders made 16 sales worth $6.2M.

Shares Outstanding

30.550M

Shares Float

29.834M

Insider Shares Owned

680.364K

Insider % Owned

2.2%

Institutional Shares Held

16.431M

Institutional % Held

53.8%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

Sales (90d)

$6.2M total

Net Activity

Net Selling

Net Value (90d)

-$6.2M

Castle Biosciences Insider Transactions (Last 6 Months)

See all insider trades →

Date	Insider	Title	Type	Shares	Price	Value
Aug 25, 2026	Tobin Juvenal	CHIEF COMMERCIAL OFFICER	SELL	9.050K	$35.04	$317K
Aug 24, 2026	Kristen Oelschlager	CHIEF OPERATING OFFICER	SELL	24.602K	$34.06	$838K
Aug 17, 2026	Tobin Juvenal	CHIEF COMMERCIAL OFFICER	SELL	1.730K	$29.59	$51K
Aug 14, 2026	Frank Stokes	CHIEF FINANCIAL OFFICER	SELL	24.908K	$29.77	$742K
Aug 14, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	6.132K	$16.20	$214K
Aug 4, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	16.114K	$16.73	$1.2M
Aug 3, 2026	Kristen Oelschlager	CHIEF OPERATING OFFICER	SELL	8.586K	$29.77	$256K
Jul 31, 2026	Tobin Juvenal	CHIEF COMMERCIAL OFFICER	SELL	19.040K	$29.21	$556K
Jul 31, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	11.502K	$16.34	$826K
Jul 27, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	3.622K	$13.28	$223K
Jul 14, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	3.622K	$12.65	$94K
Jul 1, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	3.622K	$13.34	$224K
Jul 1, 2026	Kristen Oelschlager	CHIEF OPERATING OFFICER	SELL	8.586K	$24.42	$210K
Jun 16, 2026	Kristen Oelschlager	CHIEF OPERATING OFFICER	SELL	8.587K	$20.71	$178K
Jun 15, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	3.622K	$11.52	$85K
Jun 1, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	3.622K	$11.62	$190K
May 20, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	3.622K	$11.27	$83K
May 7, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	3.622K	$12.27	$203K
Apr 21, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	3.622K	$13.74	$103K
Apr 6, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	3.622K	$13.71	$231K
Mar 26, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	3.622K	$13.97	$105K
Mar 17, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	19.300K	$25.91	$500K
Mar 13, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	30.779K	$25.75	$792K
Mar 12, 2026	Tobin Juvenal	CHIEF COMMERCIAL OFFICER	SELL	20.863K	$25.24	$527K
Mar 11, 2026	DEREK MAETZOLD	PRES. & CHIEF EXEC. OFFICER	SELL	37.899K	$14.03	$1.1M
Mar 5, 2026	Frank Stokes	CHIEF FINANCIAL OFFICER	SELL	6.001K	$27.98	$168K
Mar 5, 2026	Bradley Cole	DIRECTOR	SELL	2.655K	$15.92	$195K
Mar 3, 2026	Frank Stokes	CHIEF FINANCIAL OFFICER	SELL-OPTIONS	6.603K	$15.60	$581K

More with Benzinga EdgeGet Access

Congressional Trading Activity

See all government trades →

Date	Member	Party	Chamber	Action	Amount
Mar 15, 2022	Josh Gottheimer	D	House	S	$1,001 - $15,000

Castle Biosciences Inc

Castle Biosciences Ownership & Insider Activity

Castle Biosciences Insider Transactions (Last 6 Months)

Congressional Trading Activity

People Also Watch

People Also Watch