Castle Biosciences

US · CSTL #3242 by market cap Listed 2019

33.00 -0.36 -1.08%

Live - 5344 symbols - heartbeat 307s ago · 2026-10-07 19:54

After-hours 33.00 0.00%

Market cap: 1.01B
P/E (TTM): -51.56
P/B: 2.14
EPS: -0.83
Div yield: 0.00%
52W pos: 58%

Reader sentiment Are you bullish or bearish on CSTL?

Anonymous reader poll. Unscientific, not investment advice.

✦ Quant Ownership Signal how this is computed

Distributing

The number of reporting institutions decreased by 1 in the most recent period (2026/Q3).
Total institutional ownership fell 1.3 percentage points.

Institutional ownership

Held by institutions: 90.73% -1.26pp
Institutions: 216 -1
As of: 2026/Q3 vs. prior period

Ownership vs. money flow

Diverging

Institutions trimmed shares last reporting period, and the stock has seen net inflows in main-fund flow over the last 20 trading sessions - the two are pointing in different directions.

Institutional ownership changes are reported quarterly with a lag; fund-flow data is daily. Treat this as a directional cross-check, not a precise timing signal.

Holder types

Mutual Fund61.16%

Hedge Fund22.15%

Public Company4.32%

Individual/Insider2.02%

Private Company1.07%

Government Pension Fund1.03%

Insurance Company0.74%

Sovereign Wealth Fund0.21%

Other7.24%

Top holders as of 2026-06-30

BlackRock 10.78% · 3.29M sh

RTW Investments, LP 9.09% · 2.78M sh

Principal Global Investors, LLC 5.65% · 1.73M sh

Vanguard Capital Management, LLC 4.66% · 1.42M sh

Acadian Asset Management LLC 3.01% · 918.67K sh

Allianz Asset Management AG 2.88% · 879.26K sh

Vanguard Portfolio Management, LLC 2.75% · 840.79K sh

Summit Partners Public Asset Management, LLC 2.70% · 824.87K sh

State Street Global Advisors 2.69% · 822.08K sh

Geode Capital Management, LLC 2.61% · 795.91K sh

Bar length is relative to the largest holder shown here, not to 100% of the company.

Insiders

50 filings tracked · 13 buys · 37 sells

Name	Role	Stake
Derek Maetzold	Chief Executive Officer	0.63%
Kristen Oelschlager	Chief Operating Officer	0.28%
Tobin Juvenal	Chief Commercial Officer	0.17%
Ellen Goldberg	Independent Director	0.13%
Tiffany Olson	Independent Director	0.13%
Kimberlee Caple	Independent Director	0.12%
Daniel Bradbury	Independent Chairperson	0.12%
Miles Harrison	Independent Director	0.12%
Frank Stokes	Chief Financial Officer	0.12%
Rodney Cotton	Independent Director	0.11%

Insider transactions most recent Form 4 filings

Date	Name	Role	Type	Shares	Price
2026-10-04	Derek Maetzold	Chief Executive Officer	Intent to Sell (Form 144)	-28,992	$36.65
2026-09-30	Kristen Oelschlager	Chief Operating Officer	Derivative Exercise and Sale	-4,153	$3.38–36.38
2026-09-29	Tobin Juvenal	Chief Commercial Officer	Automatic Disposition	-6,577	$34.20–35.50
2026-09-20	Derek Maetzold	Chief Executive Officer	Automatic Disposition	-5,916	$35.33
2026-09-20	Derek Maetzold	Chief Executive Officer	Derivative Exercise and Sale	-8,580	$2.39–35.33
2026-09-14	Tobin Juvenal	Chief Commercial Officer	Automatic Disposition	-6,600	$32.32–35.14
2026-09-10	Derek Maetzold	Chief Executive Officer	Automatic Disposition	-5,934	$32.00–32.78
2026-09-10	Derek Maetzold	Chief Executive Officer	Derivative Exercise and Sale	-8,584	$2.39–32.00
2026-08-31	Kristen Oelschlager	Chief Operating Officer	Derivative Exercise and Sale	-4,152	$3.38–34.02
2026-08-30	Tobin Juvenal	Chief Commercial Officer	Automatic Disposition	-1,730	$32.81
2026-08-27	Derek Maetzold	Chief Executive Officer	Automatic Disposition	-6,132	$33.14–33.88
2026-08-27	Derek Maetzold	Chief Executive Officer	Derivative Exercise and Sale	-12,428	$2.39–33.14
2026-08-24	Tobin Juvenal	Chief Commercial Officer	Automatic Disposition	-9,050	$35.04
2026-08-24	Kristen Oelschlager	Chief Operating Officer	Open Market Disposition	-24,602	$33.69–34.64
2026-08-16	Tobin Juvenal	Chief Commercial Officer	Automatic Disposition	-1,730	$29.59
2026-08-13	Derek Maetzold	Chief Executive Officer	Automatic Disposition	-6,132	$30.02
2026-08-13	Derek Maetzold	Chief Executive Officer	Derivative Exercise and Sale	-1,100	$2.39–30.02
2026-08-13	Frank Stokes	Chief Financial Officer	Open Market Disposition	-24,908	$29.77
2026-08-04	Derek Maetzold	Chief Executive Officer	Automatic Disposition	-16,114	$30.68–31.34
2026-08-04	Derek Maetzold	Chief Executive Officer	Derivative Exercise and Sale	-22,902	$2.39–31.34

Form 4 filings, most recent per company. "Other Derivative Acquisition" rows are mostly RSU/option vesting, not open-market buying - the Type column says which.

Quote time 2026-10-07 19:54:59 · For reference only, not investment advice and not tailored to your situation.