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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. Officer2026-04-211,357$25.10
$34.06kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-04-21550$25.10
$13.80kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-04-21550$2.39
$1.31kBuy
Derek J. MaetzoldPres. Chief Exec. Officer2026-04-21278$25.10
$6.98kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-04-21278$25.10
$6.98kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-04-21278$25.10
$6.98kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-04-21278$25.10
$6.98kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-04-211,153$25.10
$28.94kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-04-061,153$25.03
$28.86kSell
Derek J. MaetzoldPres. Chief Exec. Officer2026-04-066,214$2.39
$14.85kBuy

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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 Inc10.24%3,105,246$59.74MInstitution
Vanguard Group Inc7.25%2,199,829$42.32MInstitution
Rtw Investments LP6.97%2,115,237$40.70MInstitution
Principal Financial Group Inc5.96%1,807,644$34.78MInstitution
Portolan Capital Management LLC5.70%1,729,463$33.27MInstitution
Sofinnova Healthquest Partners LP4.73%1,433,577$27.58MInsider
Dimensional Fund Advisors LP3.77%1,143,799$22.01MInstitution
Summit Partners Public Asset Management LLC3.49%1,058,725$20.37MInstitution
State Street Corp2.43%736,454$14.17MInstitution
Derek J. Maetzold2.36%716,056$13.78MInsider

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CSTL vs Diagnostic & Research Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
CSTL86.04%13.96%Net SellingNet Selling
PSNL68.86%31.14%Net Buying
ACRS51.55%48.45%Net SellingNet Selling
FLGT57.68%42.32%Net SellingNet Selling
MYGN89.81%10.19%Net SellingNet Selling
View Top Diagnostic & Research Stocks

Castle Biosciences Stock Ownership FAQ

Who owns Castle Biosciences?

Castle Biosciences (NASDAQ: CSTL) is owned by 90.04% institutional shareholders, 14.61% 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 $28.43M.

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