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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
Tobin W. JuvenalCCO2026-09-153,294$35.14
$115.76kSell
Tobin W. JuvenalCCO2026-09-143,306$32.32
$106.86kSell
Derek J. MaetzoldCEO;Pres2026-09-11223$32.78
$7.31kSell
Derek J. MaetzoldCEO;Pres2026-09-112,656$32.00
$84.99kSell
Derek J. MaetzoldCEO;Pres2026-09-113,124$32.00
$99.97kSell
Derek J. MaetzoldCEO;Pres2026-09-118,361$32.00
$267.55kSell
Derek J. MaetzoldCEO;Pres2026-09-118,584$2.39
$20.52kBuy
Derek J. MaetzoldCEO;Pres2026-09-1171$32.78
$2.33kSell
Derek J. MaetzoldCEO;Pres2026-09-1183$32.78
$2.72kSell
Kristen M. OelschlagerCOO2026-09-013,952$33.36
$131.84kSell

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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
Sofinnova Healthquest Partners LP4.69%1,433,577$50.66MInsider
Derek J. Maetzold3.13%955,985$33.78MInsider
Daniel Zeff1.77%539,256$19.06MInsider
David S. Kabakoff1.65%503,577$17.80MInsider
Daniel Bradbury0.78%236,916$8.37MInsider
Mgc Venture Partners 2013 GP LLC0.44%134,700$4.76MInsider
Joseph C. Cook Iii0.41%125,124$4.42MInsider
Eric C. Chen0.29%90,000$3.18MInsider
Kristen M. Oelschlager0.28%86,005$3.04MInsider
Tobin W. Juvenal0.20%60,814$2.15MInsider

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CSTL vs Diagnostic & Research Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
CSTL0.09%15.27%Net SellingNet Selling
OPK0.03%99.97%Net BuyingNet Selling
ACRS0.08%53.53%Net SellingNet Selling
FLGT0.06%49.26%Net SellingNet Selling
PSNL0.08%34.33%Net BuyingNet Buying
View Top Diagnostic & Research Stocks

Castle Biosciences Stock Ownership FAQ

Who owns Castle Biosciences?

Castle Biosciences (NASDAQ: CSTL) is owned by 0.09% institutional shareholders, 15.27% Castle Biosciences insiders, and 84.64% retail investors. Sofinnova Healthquest Partners LP is the largest individual Castle Biosciences shareholder, owning 1.43M shares representing 4.69% of the company. Sofinnova Healthquest Partners LP's Castle Biosciences shares are currently valued at $50.66M.

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