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

Insider buying vs selling

Have Castle Biosciences Inc insiders been buying or selling?

Buy
Sell
NameRoleDateSharesPriceValue
Kristen M. OelschlagerChief Operating Officer2025-08-2718,007$21.69
$390.57kSell
Kristen M. OelschlagerChief Operating Officer2025-08-2712,677$22.02
$279.13kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-08-151,339$20.04
$26.83kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-08-1343,019$19.50
$839.04kSell
Tobin W. JuvenalChief Commercial Officer2025-08-084,294$19.36
$83.13kSell
Kristen M. OelschlagerChief Operating Officer2025-08-082,804$19.36
$54.29kSell
Frank StokesChief Financial Officer2025-08-084,356$19.36
$84.33kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-08-0823,972$19.36
$464.10kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-06-27660$20.30
$13.40kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-06-278,068$20.30
$163.78kSell

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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 Inc10.88%3,154,679$74.01MInstitution
Vanguard Group Inc7.48%2,170,028$50.91MInstitution
Principal Financial Group Inc6.20%1,798,974$42.20MInstitution
Portolan Capital Management LLC5.13%1,489,572$34.95MInstitution
Sofinnova Healthquest Partners LP4.94%1,433,577$33.63MInsider
Dimensional Fund Advisors LP4.75%1,378,005$32.33MInstitution
Nuveen LLC3.70%1,073,107$25.18MInstitution
Wasatch Advisors LP3.62%1,049,773$24.63MInstitution
Citadel Advisors LLC3.06%888,515$20.84MInstitution
Braidwell LP2.84%822,735$19.30MInstitution

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CSTL vs Diagnostic & Research Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
CSTL85.55%14.45%Net SellingNet Selling
FLGT53.13%42.24%Net SellingNet Selling
CDNA78.11%21.89%Net SellingNet Selling
MYGN91.32%8.68%Net SellingNet Buying
LAB54.17%45.83%Net BuyingNet Buying

Castle Biosciences Stock Ownership FAQ

Who owns Castle Biosciences?

Castle Biosciences (NASDAQ: CSTL) is owned by 91.48% institutional shareholders, 15.45% Castle Biosciences insiders, and 0.00% retail investors. Sofinnova Healthquest Partners LP is the largest individual Castle Biosciences shareholder, owning 1.43M shares representing 4.94% of the company. Sofinnova Healthquest Partners LP's Castle Biosciences shares are currently valued at $34.42M.

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