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Castle Biosciences (CSTL) Institutional Ownership

Castle Biosciences logo
$33.11 +0.23 (+0.70%)
Closing price 04:00 PM Eastern
Extended Trading
$33.08 -0.03 (-0.11%)
As of 07:30 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.
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Institutional Ownership Changes (13F Filings) for Castle Biosciences (NASDAQ:CSTL)

Current
Institutional Ownership
Percentage
92.60%
Number of
Institutional Buyers
(last 12 months)
110
Total
Institutional Inflows
(last 12 months)
$363.65M
Number of
Institutional Sellers
(last 12 months)
60
Total
Institutional Outflows
(last 12 months)
$144.46M
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CSTL Institutional Buying and Selling by Quarter

Castle Biosciences Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
10/8/2026Green Alpha Advisors LLC13,828$491K0.3%+39.1%0.045%
9/9/2026Tidal Investments LLC22,186$529K0.0%N/A0.073%
9/9/2026Engineers Gate Manager LP29,480$703K0.0%+61.5%0.096%
8/19/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC64,346$1.54M0.0%-1.0%0.211%
8/18/2026Empowered Funds LLC142,338$3.40M0.0%N/A0.466%
8/18/2026Jefferies Financial Group Inc.647,391$15.44M0.1%N/A2.119%
8/17/2026Bank of America Corp DE98,745$2.36M0.0%N/A0.323%
8/15/2026Man Group plc108,761$2.59M0.0%N/A0.356%
8/15/2026Jupiter Topco LLC15,037$358K0.0%N/A0.049%
8/14/2026Palisade Capital Management LP231,931$5.53M0.2%N/A0.759%
8/14/2026Parkman Healthcare Partners LLC144,791$3.45M0.4%N/A0.474%
8/14/2026Legal & General Group Plc20,548$490K0.0%N/A0.067%
8/14/2026The Manufacturers Life Insurance Company12,543$299K0.0%N/A0.041%
8/14/2026Algert Global LLC70,478$1.68M0.0%+102.7%0.231%
8/13/2026Connor Clark & Lunn Investment Management Ltd.331,727$7.91M0.0%N/A1.086%
8/12/2026Quantbot Technologies LP2,599$62K0.0%N/A0.009%
8/11/2026Green Alpha Advisors LLC9,941$237K0.2%N/A0.033%
8/11/2026Advisors Capital Management LLC238,204$5.68M0.1%N/A0.780%
8/10/2026Diversify Advisory Services LLC15,932$389K0.0%N/A0.052%
8/7/2026BlackRock Inc.3,291,963$78.51M0.0%N/A10.776%
8/7/2026Deutsche Bank AG30,139$719K0.0%N/A0.099%
8/7/2026AIGH Capital Management LLC545,101$13.00M0.8%N/A1.784%
8/6/2026Global Retirement Partners LLC1,100$26K0.0%N/A0.004%
8/6/2026Bank of New York Mellon Corp98,018$2.34M0.0%N/A0.321%
8/6/2026State of Wyoming4,923$117K0.0%N/A0.016%
8/3/2026Summit Global Investments13,078$312K0.0%N/A0.043%
7/10/2026Wasatch Advisors LP279,349$6.66M0.0%-38.6%0.921%
7/9/2026First Bank & Trust18,591$443K0.1%+12.6%0.061%
6/3/2026Parallel Advisors LLC13,301$327K0.0%-4.9%0.044%
5/19/2026Bank of America Corp DE67,810$1.67M0.0%-74.2%0.224%
5/18/2026Empowered Funds LLC132,184$3.25M0.0%+8.4%0.436%
5/16/2026The Manufacturers Life Insurance Company12,438$305K0.0%+46.6%0.041%
5/16/2026Quantinno Capital Management LP45,476$1.12M0.0%+387.3%0.150%
5/16/2026SummitTX Capital L.P.67,033$1.65M0.1%+285.0%0.221%
5/14/2026Renaissance Technologies LLC532,800$13.08M0.0%+8.1%1.757%
5/14/2026Arrowstreet Capital Limited Partnership27,142$666K0.0%+286.1%0.089%
5/14/2026Sei Investments Co.35,046$860K0.0%-11.8%0.116%
5/14/2026State of Wyoming9,522$234K0.0%+215.9%0.031%
5/8/2026Summit Global Investments13,718$337K0.0%+10.9%0.045%
5/7/2026Dimensional Fund Advisors LP1,039,761$25.52M0.0%-9.1%3.432%
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5/7/2026Parallel Advisors LLC13,301$327K0.0%-4.9%0.044%
5/7/2026KBC Group NV36,932$907K0.0%N/A0.122%
5/6/2026Assetmark Inc.5,779$142K0.0%+9.3%0.019%
5/6/2026Allspring Global Investments Holdings LLC160,663$3.94M0.0%+0.9%0.530%
5/5/2026Bank of New York Mellon Corp88,654$2.18M0.0%+1.9%0.293%
5/4/2026Principal Financial Group Inc.1,769,877$43.45M0.0%-2.1%5.841%
5/2/2026Diversify Wealth Management LLC15,760$382K0.0%+36.0%0.052%
5/1/2026Kornitzer Capital Management Inc. KS264,396$6.49M0.1%-1.2%0.873%
4/30/2026AIGH Capital Management LLC590,601$14.50M2.0%-5.5%1.949%
4/27/2026Y Intercept Hong Kong Ltd23,501$577K0.0%+77.4%0.078%
4/25/2026Strs Ohio25,000$614K0.0%+98.4%0.083%
4/24/2026Perkins Capital Management Inc.15,415$378K0.4%-45.0%0.051%
4/23/2026Inspire Investing LLC21,045$517K0.0%+75.2%0.069%
4/21/2026Wasatch Advisors LP455,036$11.17M0.1%-15.3%1.502%
4/16/2026SG Americas Securities LLC244,886$6.01M0.0%+1,051.8%0.808%
3/20/2026Hsbc Holdings PLC19,486$760K0.0%-41.4%0.066%
3/3/2026Caitong International Asset Management Co. Ltd2,099$82K0.0%+188.3%0.007%
2/19/2026Invesco Ltd.135,461$5.27M0.0%+142.6%0.464%
2/18/2026Mackenzie Financial Corp37,317$1.46M0.0%+54.2%0.128%
2/18/2026Empowered Funds LLC121,920$4.74M0.0%+24.2%0.418%
2/18/2026XTX Topco Ltd22,125$861K0.0%N/A0.076%
2/18/2026Verdad Advisers LP7,085$276K0.1%N/A0.024%
2/18/2026Wellington Management Group LLP218,560$8.50M0.0%N/A0.749%
2/18/2026SummitTX Capital L.P.17,410$677K0.0%-61.3%0.060%
2/18/2026Tudor Investment Corp ET AL167,178$6.50M0.0%+95.7%0.573%
2/18/2026RTW Investments LP2,115,237$82.28M0.8%N/A7.246%
2/18/2026Palisade Capital Management LP567,777$22.09M0.7%-11.1%1.945%
2/18/2026Millennium Management LLC308,914$12.02M0.0%-46.3%1.058%
2/18/2026Man Group plc11,585$451K0.0%N/A0.040%
2/18/2026Inspire Investing LLC12,011$467K0.0%-39.6%0.041%
2/18/2026Janus Henderson Group PLC15,037$585K0.0%+64.6%0.052%
2/18/2026Engineers Gate Manager LP22,949$893K0.0%-50.7%0.079%
2/18/2026Bridgeway Capital Management LLC246,920$9.61M0.2%+39.4%0.846%
2/17/2026Schonfeld Strategic Advisors LLC21,476$835K0.0%-75.5%0.074%
2/17/2026AQR Capital Management LLC63,881$2.49M0.0%+25.6%0.219%
2/17/2026Braidwell LP177,183$6.89M0.2%-78.5%0.607%
2/17/2026Cetera Investment Advisers8,935$348K0.0%N/A0.031%
2/17/2026Trexquant Investment LP64,605$2.51M0.0%-63.8%0.221%
2/17/2026Jump Financial LLC5,500$214K0.0%N/A0.019%
2/17/2026Price T Rowe Associates Inc. MD34,138$1.33M0.0%+4.7%0.117%
2/17/2026Osaic Holdings Inc.36,404$1.42M0.0%+8,822.5%0.125%
2/17/2026California State Teachers Retirement System27,725$1.08M0.0%+12.6%0.095%
2/17/2026Kemnay Advisory Services Inc.889$35K0.0%N/A0.003%
2/17/2026Summit Partners Public Asset Management LLC1,058,725$41.18M0.9%+164.7%3.627%
2/17/2026Graham Capital Management L.P.10,928$425K0.0%-48.3%0.037%
2/17/2026Persistent Asset Partners Ltd2,463$96K0.0%N/A0.008%
2/16/2026Squarepoint Ops LLC55,118$2.14M0.0%N/A0.189%
2/16/2026TritonPoint Partners LLC10,777$419K0.2%N/A0.037%
2/16/2026Verition Fund Management LLC16,811$654K0.0%+7.5%0.058%
2/16/2026Panagora Asset Management Inc.45,995$1.79M0.0%+114.9%0.158%
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2/16/2026Eventide Asset Management LLC305,000$11.86M0.2%N/A1.045%
2/16/2026Barclays PLC72,149$2.81M0.0%-1.3%0.247%
2/13/2026The Manufacturers Life Insurance Company 8,487$330K0.0%-11.0%0.029%
2/13/2026CANADA LIFE ASSURANCE Co3,244$126K0.0%-69.7%0.011%
2/13/2026Schroder Investment Management Group492,161$19.35M0.0%-0.6%1.686%
2/13/2026Birchview Capital LP80,600$3.14M1.8%-27.1%0.276%
2/13/2026Charles Schwab Investment Management Inc.242,535$9.44M0.0%+1.8%0.831%
2/13/2026State Street Corp736,454$28.65M0.0%+1.7%2.523%
2/13/2026Caitong International Asset Management Co. Ltd1,750$68K0.2%+140.4%0.006%
2/13/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC69,628$2.71M0.0%+21.2%0.239%


CSTL Institutional Ownership - Frequently Asked Questions

During the previous two years, 199 institutional investors and hedge funds held shares of Castle Biosciences. The most heavily invested institutionals were Vanguard Group Inc. ($85.57M), RTW Investments LP ($82.28M), BlackRock Inc. ($78.51M), Principal Financial Group Inc. ($43.45M), Summit Partners Public Asset Management LLC ($41.18M), Portolan Capital Management LLC ($34.50M), and State Street Corp ($28.65M).Learn more on Castle Biosciences' institutional investors.

92.60% of Castle Biosciences' stock is owned by institutional investors. Learn more on CSTL's institutional investor holdings.

Of the 169 institutional investors that purchased Castle Biosciences' stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: BlackRock Inc. ($3.29M), RTW Investments LP ($2.12M), Wellington Management Group LLP ($1.77M), AIGH Capital Management LLC ($1.25M), Summit Partners Public Asset Management LLC ($1.06M), Braidwell LP ($822.74K), and Nuveen LLC ($671.81K).

Institutional investors have bought a total of 12,687,351 shares in the last 24 months. This purchase volume represents approximately $363.65M in transactions.

Of the 60 institutional investors that sold Castle Biosciences' stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: Wasatch Advisors LP ($770.42K), Braidwell LP ($645.55K), Dimensional Fund Advisors LP ($434.33K), Nuveen LLC ($432.40K), Millennium Management LLC ($266.18K), Bank of America Corp DE ($262.58K), and UBS Group AG ($221.98K).

Institutional investors have sold a total of 4,459,720 shares in the last 24 months. This volume of shares sold represents approximately $144.46M in transactions.


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Institutional ownership data for NASDAQ:CSTL is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 10/8/2026. New 13F filings are added each quarter as they're published.
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