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NASDAQ: CSTL
Castle Biosciences Inc Stock Ownership - Who owns Castle Biosciences?

OverviewForecastEarningsRevenueDividendOwnership

Insider buying vs selling

Have Castle Biosciences Inc insiders been buying or selling?

Buy
Sell
NameRoleDateSharesPriceValue
Derek J. MaetzoldPres. Chief Exec. Officer2026-02-04171$38.61
$6.60kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-02-04646$37.82
$24.43kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-02-033,200$39.91
$127.72kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-01-204,017$40.01
$160.73kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-01-061,339$40.10
$53.69kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-01-052,678$38.09
$102.01kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-12-22830$40.35
$33.49kSell
Kristen M. OelschlagerChief Operating Officer2025-12-1714,888$39.31
$585.29kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-12-17509$40.04
$20.38kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-12-1612,821$38.55
$494.30kSell

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Net Insider Buy/Sell (L12M) Ownership

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CSTL Shareholders

What type of owners hold Castle Biosciences Inc stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Blackrock Inc10.93%3,189,896$111.52MInstitution
Vanguard Group Inc7.44%2,172,318$75.94MInstitution
Principal Financial Group Inc6.15%1,794,355$62.73MInstitution
Portolan Capital Management LLC5.19%1,515,111$52.97MInstitution
Dimensional Fund Advisors LP5.05%1,474,089$51.53MInstitution
Sofinnova Healthquest Partners LP4.91%1,433,577$50.12MInsider
Nuveen LLC3.28%957,081$33.46MInstitution
Braidwell LP2.82%822,735$28.76MInstitution
Derek J. Maetzold2.72%792,777$27.72MInsider
State Street Corp2.48%724,080$25.31MInstitution

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CSTL vs Diagnostic & Research Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
CSTL85.50%14.50%Net SellingNet Selling
CDNA77.47%22.53%Net SellingNet Selling
OPK19.98%80.02%Net BuyingNet Buying
FLGT55.73%41.65%Net SellingNet Selling
PSNL64.17%35.83%Net SellingNet Buying
View Top Diagnostic & Research Stocks

Castle Biosciences Stock Ownership FAQ

Who owns Castle Biosciences?

Castle Biosciences (NASDAQ: CSTL) is owned by 90.88% institutional shareholders, 15.42% Castle Biosciences insiders, and 0.00% retail investors. Sofinnova Healthquest Partners LP is the largest individual Castle Biosciences shareholder, owning 1.43M shares representing 4.91% of the company. Sofinnova Healthquest Partners LP's Castle Biosciences shares are currently valued at $50.12M.

If you're new to stock investing, here's how to buy Castle Biosciences stock.
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