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Castle Biosciences Ownership | Who Owns Castle Biosciences?

OverviewForecastRevenueFinancialsChartTranscripts

Castle Biosciences Ownership Summary

Castle Biosciences is owned by 91.76% institutional investors, 3.16% insiders, and 5.08% retail investors. Blackrock is the largest institutional shareholder, holding 11.08% of CSTL shares. Bellevue Healthcare Ord is the top mutual fund, with 4.32% of its assets in Castle Biosciences shares.

CSTL Ownership Benchmark

TypeName% Inst% Insiders% Retail
StockCastle Biosciences91.76%3.16%5.08%
SectorHealthcare Stocks 487.91%11.08%-398.99%
IndustryDiagnostics & Research Stocks57.29%10.84%31.88%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Blackrock3.04M11.08%$66.29M
Blackrock funding, inc. /de3.15M10.91%$64.42M
Vanguard group1.83M6.58%$48.84M
Principal financial group1.79M6.21%$40.86M
Portolan capital management1.49M5.15%$30.42M
Wasatch advisors lp1.05M3.63%$21.44M
Dimensional fund advisors lp999.47K3.59%$26.64M
Ubs group812.60K2.92%$21.66M
Braidwell lp822.74K2.85%$16.80M
Wellington management group llp722.12K2.59%$19.24M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Aigh capital management707.29K4.54%$16.10M
Birchview capital, lp110.60K2.24%$2.26M
Portolan capital management1.49M1.91%$30.42M
Parkman healthcare partners352.26K0.83%$7.19M
Braidwell lp822.74K0.57%$16.80M
Perkins capital management28.14K0.56%$640.86K
Palisade capital management, lp575.12K0.33%$11.74M
Green alpha advisors9.54K0.21%$217.18K
Alpha dna investment management15.17K0.15%$404.39K
Kornitzer capital management inc /ks278.31K0.13%$6.34M

Top Buyers

HolderShares% AssetsChange
Ubs group812.60K0.00%758.47K
Wellington management group llp722.12K0.00%722.12K
Aigh capital management707.29K4.54%707.29K
Braidwell lp822.74K0.57%457.49K
Blackrock3.04M0.00%449.29K

Top Sellers

HolderShares% AssetsChange
Park west asset management---556.49K
Morgan stanley249.38K0.00%-401.33K
Bellevue group---301.10K
Soleus capital management---252.92K
Cubist systematic strategies---237.70K

New Positions

HolderShares% AssetsChangeValue
Wellington management group llp722.12K0.00%722.12K$19.24M
Aigh capital management707.29K4.54%707.29K$16.10M
Bnp paribas arbitrage, snc249.13K0.00%249.13K$6.64M
D. e. shaw90.56K0.00%90.56K$2.41M
Empowered funds40.75K0.01%40.75K$832.12K

Sold Out

HolderChange
Nelson, van denburg & campbell wealth management group-1.00
Twin peaks wealth advisors-1.00
National bank of canada /fi/-1.00
Stephens consulting-2.00
Colonial trust advisors-6.00

Institutional Ownership Trends

DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Jun 30, 2025151-17.03%26,530,4542.55%911.12%85-19.81%44-18.52%
Mar 31, 2025178-13.17%25,557,223-3.26%890.99%105-2.78%53-19.70%
Dec 31, 20242023.59%26,322,0332.20%941.10%106-11.67%6538.30%
Sep 30, 202419518.90%25,754,3952.29%921.12%11938.37%48-4.00%
Jun 30, 20241637.24%25,178,6030.98%911.08%8518.06%50-7.41%

Top Mutual Funds Shareholders

HolderShares% HoldingChange
Bellevue Healthcare Ord1.20M4.32%1.20M
Vanguard US Total Market Shares ETF829.40K2.96%-
Principal SmallCap R5829.94K2.86%78.59K
Vanguard Total Stock Mkt Idx Inv826.46K2.85%-18.32K
Principal U.S. Small Cap Equity781.42K2.71%159.12K
Strategic Advisers U.S. Total Stock{mg}693.06K2.47%-
Wasatch Small Cap Growth Investor675.19K2.41%-14.34K
Strategic Advisers Small-Mid Cap665.91K2.40%62.85K
iShares Russell 2000 ETF691.79K2.38%-
Wasatch Ultra Growth627.21K2.17%33.31K

Recent Insider Transactions

DateNameRoleActivityValue
Oct 31, 2025Oelschlager Kristen M Chief Operating OfficerSell$317.46K
Aug 27, 2025Oelschlager Kristen M Chief Operating OfficerSell$390.57K
Oct 20, 2025MAETZOLD DEREK J Pres. & Chief Exec. OfficerSell$30.05K
Oct 02, 2025MAETZOLD DEREK J Pres. & Chief Exec. OfficerSell$30.23K
Sep 17, 2025MAETZOLD DEREK J Pres. & Chief Exec. OfficerSell$29.42K

Insider Transactions Trends

DateBuySell
2025 Q3-6
2025 Q2-20
2025 Q1-61
2024 Q4-64
2024 Q3-55

CSTL Ownership FAQ

Who Owns Castle Biosciences?

Castle Biosciences shareholders are primarily institutional investors at 91.76%, followed by 3.16% insiders and 5.08% retail investors. The average institutional ownership in Castle Biosciences's industry, Diagnostics & Research Stocks, is 57.29%, which Castle Biosciences exceeds.

Who owns the most shares of Castle Biosciences?

Castle Biosciences’s largest shareholders are Blackrock (3.04M shares, 11.08%), Blackrock funding, inc. /de (3.15M shares, 10.91%), and Vanguard group (1.83M shares, 6.58%). Together, they hold 28.57% of Castle Biosciences’s total shares outstanding.

Does Blackrock own Castle Biosciences?

Yes, BlackRock owns 11.08% of Castle Biosciences, totaling 3.04M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 66.29M$. In the last quarter, BlackRock increased its holdings by 449.29K shares, a 17.31% change.

Who is Castle Biosciences’s biggest shareholder by percentage of total assets invested?

Aigh capital management is Castle Biosciences’s biggest shareholder by percentage of total assets invested, with 4.54% of its assets in 707.29K Castle Biosciences shares, valued at 16.1M$.

Who is the top mutual fund holder of Castle Biosciences shares?

Bellevue Healthcare Ord is the top mutual fund holder of Castle Biosciences shares, with 4.32% of its total shares outstanding invested in 1.2M Castle Biosciences shares.

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