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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. JuvenalCCO2026-10-285,341$36.62
$195.58kSell
Tobin W. JuvenalCCO2026-10-281,237$35.58
$44.01kSell
Tobin W. JuvenalCCO2026-10-263,288$33.08
$108.77kSell
Derek J. MaetzoldCEO;Pres2026-10-192,718$31.91
$86.73kSell
Derek J. MaetzoldCEO;Pres2026-10-198,580$31.91
$273.79kSell
Derek J. MaetzoldCEO;Pres2026-10-193,198$31.91
$102.05kSell
Tobin W. JuvenalCCO2026-10-123,288$33.64
$110.61kSell
Derek J. MaetzoldCEO;Pres2026-10-053,198$35.57
$113.74kSell
Derek J. MaetzoldCEO;Pres2026-10-058,165$2.39
$19.51kBuy
Derek J. MaetzoldCEO;Pres2026-10-058,580$35.57
$305.16kSell

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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$50.09MInsider
Derek J. Maetzold3.04%929,242$32.47MInsider
Daniel Zeff1.77%539,256$18.84MInsider
David S. Kabakoff1.65%503,577$17.59MInsider
Daniel Bradbury0.78%236,916$8.28MInsider
Mgc Venture Partners 2013 GP LLC0.44%134,700$4.71MInsider
Joseph C. Cook Iii0.41%125,124$4.37MInsider
Eric C. Chen0.29%90,000$3.14MInsider
Kristen M. Oelschlager0.28%86,005$3.01MInsider
Bonnie H. Anderson0.15%45,353$1.58MInsider

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CSTL vs Diagnostic & Research Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
CSTL0.09%15.11%Net SellingNet Selling
FRNM0.01%24.56%Net BuyingNet Selling
OPK0.03%99.97%Net Buying
MYGN0.09%11.82%Net SellingNet Selling
ACRS0.08%53.53%Net Selling
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, 15.11% Castle Biosciences insiders, and 84.80% 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 $50.38M.

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