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Castle Biosciences (CSTL) Institutional Ownership

Castle Biosciences logo
$29.62 -0.93 (-3.04%)
Closing price 08/14/2026 04:00 PM Eastern
Extended Trading
$29.61 -0.01 (-0.03%)
As of 08/14/2026 07:34 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)
114
Total
Institutional Inflows
(last 12 months)
$339.54M
Number of
Institutional Sellers
(last 12 months)
60
Total
Institutional Outflows
(last 12 months)
$144.48M
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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
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 Company 12,543$299K0.0%N/A0.041%
8/14/2026 Algert Global LLC70,478$1.68M0.0%+102.7%0.231%
8/13/2026 Connor Clark & Lunn Investment Management Ltd.331,727$7.91M0.0%N/A1.086%
8/12/2026 Quantbot Technologies LP2,599$62K0.0%N/A0.009%
8/11/2026 Green Alpha Advisors LLC9,941$237K0.2%N/A0.033%
8/11/2026 Advisors Capital Management LLC238,204$5.68M0.1%N/A0.780%
8/10/2026 Diversify Advisory Services LLC15,932$389K0.0%N/A0.052%
8/7/2026 BlackRock Inc.3,291,963$78.51M0.0%N/A10.776%
8/7/2026 Deutsche Bank AG30,139$719K0.0%N/A0.099%
8/7/2026 AIGH Capital Management LLC545,101$13.00M0.8%N/A1.784%
8/6/2026 Global Retirement Partners LLC1,100$26K0.0%N/A0.004%
8/6/2026 Bank of New York Mellon Corp98,018$2.34M0.0%N/A0.321%
8/6/2026 State of Wyoming4,923$117K0.0%N/A0.016%
8/3/2026 Summit Global Investments13,078$312K0.0%N/A0.043%
7/10/2026 Wasatch Advisors LP279,349$6.66M0.0%-38.6%0.921%
7/9/2026 First Bank & Trust18,591$443K0.1%+12.6%0.061%
6/3/2026 Parallel 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 Company 12,438$305K0.0%+46.6%0.041%
5/16/2026 Quantinno 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%
5/14/2026 Renaissance Technologies LLC532,800$13.08M0.0%+8.1%1.757%
5/14/2026 Arrowstreet Capital Limited Partnership27,142$666K0.0%+286.1%0.089%
5/14/2026Sei Investments Co.35,046$860K0.0%-11.8%0.116%
5/14/2026 State of Wyoming9,522$234K0.0%+215.9%0.031%
5/8/2026 Summit Global Investments13,718$337K0.0%+10.9%0.045%
5/7/2026 Dimensional Fund Advisors LP1,039,761$25.52M0.0%-9.1%3.432%
5/7/2026 Parallel Advisors LLC13,301$327K0.0%-4.9%0.044%
5/7/2026 KBC Group NV36,932$907K0.0%N/A0.122%
5/6/2026 Assetmark Inc.5,779$142K0.0%+9.3%0.019%
5/6/2026 Allspring Global Investments Holdings LLC160,663$3.94M0.0%+0.9%0.530%
5/5/2026 Bank of New York Mellon Corp88,654$2.18M0.0%+1.9%0.293%
5/4/2026 Principal Financial Group Inc.1,769,877$43.45M0.0%-2.1%5.841%
5/2/2026 Diversify Wealth Management LLC15,760$382K0.0%+36.0%0.052%
5/1/2026 Kornitzer Capital Management Inc. KS264,396$6.49M0.1%-1.2%0.873%
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4/30/2026 AIGH Capital Management LLC590,601$14.50M2.0%-5.5%1.949%
4/27/2026 Y Intercept Hong Kong Ltd23,501$577K0.0%+77.4%0.078%
4/25/2026 Strs Ohio25,000$614K0.0%+98.4%0.083%
4/24/2026 Perkins Capital Management Inc.15,415$378K0.4%-45.0%0.051%
4/23/2026 Inspire Investing LLC21,045$517K0.0%+75.2%0.069%
4/21/2026 Wasatch Advisors LP455,036$11.17M0.1%-15.3%1.502%
4/16/2026 SG Americas Securities LLC244,886$6.01M0.0%+1,051.8%0.808%
3/20/2026Hsbc Holdings PLC19,486$760K0.0%-41.4%0.066%
3/3/2026 Caitong 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%
2/18/2026 Mackenzie 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%
2/18/2026 Inspire 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%
2/17/2026 Cetera Investment Advisers8,935$348K0.0%N/A0.031%
2/17/2026Trexquant Investment LP64,605$2.51M0.0%-63.8%0.221%
2/17/2026 Jump 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%
2/17/2026 Persistent Asset Partners Ltd2,463$96K0.0%N/A0.008%
2/16/2026Squarepoint Ops LLC55,118$2.14M0.0%N/A0.189%
2/16/2026 TritonPoint Partners LLC10,777$419K0.2%N/A0.037%
2/16/2026Verition Fund Management LLC16,811$654K0.0%+7.5%0.058%
2/16/2026 Panagora Asset Management Inc.45,995$1.79M0.0%+114.9%0.158%
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%
2/13/2026 CANADA LIFE ASSURANCE Co3,244$126K0.0%-69.7%0.011%
2/13/2026 Schroder 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%
2/13/2026 State Street Corp736,454$28.65M0.0%+1.7%2.523%
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2/13/2026 Caitong International Asset Management Co. Ltd1,750$68K0.2%+140.4%0.006%
2/13/2026 UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC69,628$2.71M0.0%+21.2%0.239%
2/13/2026Wells Fargo & Company MN34,212$1.33M0.0%+42.7%0.117%
2/12/2026 Wasatch Advisors LP537,241$20.90M0.1%-19.7%1.841%
2/12/2026HRT Financial LP47,654$1.85M0.0%+0.9%0.163%
2/12/2026Orion Porfolio Solutions LLC74,653$2.90M0.0%-2.2%0.256%
2/12/2026 Commonwealth Equity Services LLC6,591$256K0.0%N/A0.023%
2/12/2026 State Board of Administration of Florida Retirement System7,154$278K0.0%N/A0.025%
2/12/2026 Renaissance Technologies LLC493,100$19.18M0.0%-12.4%1.689%
2/12/2026 Dimensional Fund Advisors LP1,143,799$44.50M0.0%-22.4%3.919%


CSTL Institutional Ownership - Frequently Asked Questions

During the previous two years, 198 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 167 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 11,682,569 shares in the last 24 months. This purchase volume represents approximately $339.54M 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 4,460,979 shares in the last 24 months. This volume of shares sold represents approximately $144.48M 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 8/15/2026. New 13F filings are added each quarter as they're published.
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