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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
Kristen M. OelschlagerChief Operating Officer2026-06-168,587$20.71
$177.84kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-06-15550$20.66
$11.36kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-06-15550$2.39
$1.31kBuy
Derek J. MaetzoldPres. Chief Exec. Officer2026-06-15278$20.66
$5.74kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-06-15278$20.66
$5.74kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-06-15278$20.66
$5.74kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-06-15278$20.66
$5.74kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-06-151,357$20.66
$28.04kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-06-151,153$20.66
$23.82kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-06-011,357$20.86
$28.30kSell

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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 Inc9.83%2,982,946$63.00MInstitution
Rtw Investments LP9.09%2,758,335$58.26MInstitution
Principal Financial Group Inc5.84%1,769,877$37.38MInstitution
Sofinnova Healthquest Partners LP4.73%1,433,577$30.28MInsider
Portolan Capital Management LLC4.45%1,350,283$28.52MInstitution
Vanguard Capital Management LLC3.88%1,177,522$24.87MInstitution
Dimensional Fund Advisors LP3.43%1,039,761$21.96MInstitution
Summit Partners Public Asset Management LLC3.10%940,685$19.87MInstitution
Vanguard Portfolio Management LLC2.84%861,771$18.20MInstitution
Allianz Asset Management Gmbh2.67%811,324$17.14MInstitution

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CSTL vs Diagnostic & Research Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
CSTL85.71%14.29%Net SellingNet Selling
ACRS58.10%41.90%Net SellingNet Selling
FLGT57.05%42.95%Net SellingNet Selling
MYGN95.01%4.99%Net SellingNet Selling
PRE11.72%8.15%
View Top Diagnostic & Research Stocks

Castle Biosciences Stock Ownership FAQ

Who owns Castle Biosciences?

Castle Biosciences (NASDAQ: CSTL) is owned by 91.03% institutional shareholders, 15.17% Castle Biosciences insiders, and 0.00% retail investors. Sofinnova Healthquest Partners LP is the largest individual Castle Biosciences shareholder, owning 1.43M shares representing 4.73% of the company. Sofinnova Healthquest Partners LP's Castle Biosciences shares are currently valued at $30.39M.

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