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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. Officer2026-03-18650$25.39
$16.50kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-03-1718,650$25.93
$483.59kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-03-16126$26.68
$3.36kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-03-1617,449$25.96
$453.05kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-03-1313,204$25.45
$336.00kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-03-1223,179$25.28
$585.94kSell
Tobin W. JuvenalChief Commercial Officer2026-03-1220,863$25.24
$526.58kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-03-111,160$26.11
$30.29kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-03-116,226$2.39
$14.88kBuy
Derek J. MaetzoldPres. Chief Exec. Officer2026-03-1117,310$26.11
$451.95kSell

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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 Inc10.44%3,105,246$77.63MInstitution
Vanguard Group Inc7.40%2,199,829$55.00MInstitution
Rtw Investments LP7.11%2,115,237$52.88MInstitution
Principal Financial Group Inc6.08%1,807,644$45.19MInstitution
Portolan Capital Management LLC5.82%1,729,463$43.24MInstitution
Sofinnova Healthquest Partners LP4.82%1,433,577$35.84MInsider
Dimensional Fund Advisors LP3.85%1,143,799$28.59MInstitution
Summit Partners Public Asset Management LLC3.56%1,058,725$26.47MInstitution
State Street Corp2.48%736,454$18.41MInstitution
Derek J. Maetzold2.44%726,922$18.17MInsider

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CSTL vs Diagnostic & Research Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
CSTL86.02%13.98%Net SellingNet Selling
PSNL68.86%31.14%Net BuyingNet Buying
OPK20.62%79.38%Net BuyingNet Buying
CDNA77.00%23.00%Net SellingNet Selling
FLGT57.16%41.96%Net SellingNet Selling
View Top Diagnostic & Research Stocks

Castle Biosciences Stock Ownership FAQ

Who owns Castle Biosciences?

Castle Biosciences (NASDAQ: CSTL) is owned by 91.86% institutional shareholders, 14.92% Castle Biosciences insiders, and 0.00% retail investors. Sofinnova Healthquest Partners LP is the largest individual Castle Biosciences shareholder, owning 1.43M shares representing 4.82% of the company. Sofinnova Healthquest Partners LP's Castle Biosciences shares are currently valued at $35.84M.

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