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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. Officer2025-06-276,924$20.30
$140.56kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-06-274,944$20.30
$100.36kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-06-278,068$20.30
$163.78kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-06-27660$20.30
$13.40kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-06-27660$20.30
$13.40kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-06-27660$20.30
$13.40kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-06-27660$20.30
$13.40kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-04-21165$21.52
$3.55kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-04-211,236$21.52
$26.60kSell
Derek J. MaetzoldPres. Chief Exec. Officer2025-04-212,017$21.52
$43.40kSell

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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 Inc10.33%2,983,540$58.66MInstitution
Vanguard Group Inc7.09%2,047,565$40.26MInstitution
Principal Financial Group Inc5.08%1,467,873$28.86MInstitution
Sofinnova Healthquest Partners LP4.97%1,433,577$28.18MInsider
Portolan Capital Management LLC4.38%1,265,223$24.87MInstitution
Dimensional Fund Advisors LP4.16%1,200,222$23.60MInstitution
Wasatch Advisors LP3.46%998,455$19.63MInstitution
Wellington Management Group LLP2.87%828,528$16.29MInstitution
Derek J. Maetzold2.70%778,762$15.31MInsider
State Street Corp2.48%715,028$14.06MInstitution

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CSTL vs Diagnostic & Research Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
CSTL85.16%14.84%Net SellingNet Selling
PSNL60.27%39.73%Net BuyingNet Selling
FLGT53.50%42.54%Net SellingNet Selling
MYGN91.64%8.36%Net SellingNet Buying
LAB54.75%45.25%Net BuyingNet Selling
View Top Diagnostic & Research Stocks

Castle Biosciences Stock Ownership FAQ

Who owns Castle Biosciences?

Castle Biosciences (NASDAQ: CSTL) is owned by 89.33% institutional shareholders, 15.56% Castle Biosciences insiders, and 0.00% retail investors. Sofinnova Healthquest Partners LP is the largest individual Castle Biosciences shareholder, owning 1.43M shares representing 4.97% of the company. Sofinnova Healthquest Partners LP's Castle Biosciences shares are currently valued at $27.95M.

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