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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. Officer2026-01-061,339$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
Derek J. MaetzoldPres. Chief Exec. Officer2025-12-1518,513$38.75
$717.32kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-12-151,012$39.30
$39.78kSell
Tobin W. JuvenalChief Commercial Officer2025-12-1113,200$37.48
$494.74kSell
Frank StokesChief Financial Officer2025-12-114,496$37.45
$168.38kSell

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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$129.99MInstitution
Vanguard Group Inc7.44%2,172,318$88.52MInstitution
Principal Financial Group Inc6.15%1,794,355$73.12MInstitution
Portolan Capital Management LLC5.19%1,515,111$61.74MInstitution
Dimensional Fund Advisors LP5.05%1,474,089$60.07MInstitution
Sofinnova Healthquest Partners LP4.91%1,433,577$58.42MInsider
Nuveen LLC3.28%957,081$39.00MInstitution
Braidwell LP2.82%822,735$33.53MInstitution
Derek J. Maetzold2.74%800,811$32.63MInsider
State Street Corp2.48%724,080$29.51MInstitution

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CSTL vs Diagnostic & Research Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
CSTL85.49%14.51%Net SellingNet Selling
CDNA77.88%22.12%Net SellingNet Selling
OPK19.98%80.02%Net BuyingNet Buying
PSNL64.17%35.83%Net SellingNet Selling
FLGT55.73%41.68%Net SellingNet Selling
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, 15.43% 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 $57.36M.

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