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Castle Biosciences (CSTL) Institutional Ownership

Castle Biosciences logo
$32.91 +0.26 (+0.80%)
As of 04:00 PM Eastern
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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)
108
Total
Institutional Inflows
(last 12 months)
$383.59M
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
8/24/2026 California State Teachers Retirement System901,578$21.50M0.0%+3,176.9%2.951%
8/19/2026 UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC64,346$1.54M0.0%-1.0%0.211%
8/18/2026 Empowered Funds LLC142,338$3.40M0.0%N/A0.466%
8/18/2026Jefferies Financial Group Inc.647,391$15.44M0.1%N/A2.119%
8/17/2026 Bank of America Corp DE98,745$2.36M0.0%N/A0.323%
8/15/2026 Man Group plc108,761$2.59M0.0%N/A0.356%
8/15/2026 Jupiter Topco LLC15,037$358K0.0%N/A0.049%
8/14/2026 Palisade Capital Management LP231,931$5.53M0.2%N/A0.759%
8/14/2026 Parkman Healthcare Partners LLC144,791$3.45M0.4%N/A0.474%
8/14/2026 Legal & General Group Plc20,548$490K0.0%N/A0.067%
8/14/2026 The 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%
5/19/2026 Bank of America Corp DE67,810$1.67M0.0%-74.2%0.224%
5/18/2026 Empowered Funds LLC132,184$3.25M0.0%+8.4%0.436%
5/16/2026 The Manufacturers Life Insurance Company12,438$305K0.0%+46.6%0.041%
5/16/2026 Quantinno Capital Management LP45,476$1.12M0.0%+387.3%0.150%
5/16/2026 SummitTX 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%
5/14/2026 Sei 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%
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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%
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%
3/20/2026 Hsbc 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%
2/19/2026 Invesco Ltd.135,461$5.27M0.0%+142.6%0.464%
2/18/2026 Mackenzie Financial Corp37,317$1.46M0.0%+54.2%0.128%
2/18/2026 Empowered Funds LLC121,920$4.74M0.0%+24.2%0.418%
2/18/2026 XTX Topco Ltd22,125$861K0.0%N/A0.076%
2/18/2026 Verdad Advisers LP7,085$276K0.1%N/A0.024%
2/18/2026 Wellington Management Group LLP218,560$8.50M0.0%N/A0.749%
2/18/2026 SummitTX Capital L.P.17,410$677K0.0%-61.3%0.060%
2/18/2026 Tudor Investment Corp ET AL167,178$6.50M0.0%+95.7%0.573%
2/18/2026 RTW Investments LP2,115,237$82.28M0.8%N/A7.246%
2/18/2026 Palisade Capital Management LP567,777$22.09M0.7%-11.1%1.945%
2/18/2026 Millennium Management LLC308,914$12.02M0.0%-46.3%1.058%
2/18/2026 Man 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%
2/18/2026 Engineers Gate Manager LP22,949$893K0.0%-50.7%0.079%
2/18/2026 Bridgeway Capital Management LLC246,920$9.61M0.2%+39.4%0.846%
2/17/2026 Schonfeld Strategic Advisors LLC21,476$835K0.0%-75.5%0.074%
2/17/2026 AQR Capital Management LLC63,881$2.49M0.0%+25.6%0.219%
2/17/2026 Braidwell LP177,183$6.89M0.2%-78.5%0.607%
2/17/2026 Cetera Investment Advisers8,935$348K0.0%N/A0.031%
2/17/2026 Trexquant Investment LP64,605$2.51M0.0%-63.8%0.221%
2/17/2026 Jump Financial LLC5,500$214K0.0%N/A0.019%
2/17/2026 Price T Rowe Associates Inc. MD34,138$1.33M0.0%+4.7%0.117%
2/17/2026 Osaic Holdings Inc.36,404$1.42M0.0%+8,822.5%0.125%
2/17/2026 California State Teachers Retirement System27,725$1.08M0.0%+12.6%0.095%
2/17/2026 Kemnay Advisory Services Inc.889$35K0.0%N/A0.003%
2/17/2026 Summit Partners Public Asset Management LLC1,058,725$41.18M0.9%+164.7%3.627%
2/17/2026 Graham 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%
2/16/2026 Squarepoint Ops LLC55,118$2.14M0.0%N/A0.189%
2/16/2026 TritonPoint Partners LLC10,777$419K0.2%N/A0.037%
2/16/2026 Verition 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%
2/16/2026 Eventide Asset Management LLC305,000$11.86M0.2%N/A1.045%
2/16/2026 Barclays PLC72,149$2.81M0.0%-1.3%0.247%
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2/13/2026 The 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%
2/13/2026 Birchview Capital LP80,600$3.14M1.8%-27.1%0.276%
2/13/2026 Charles 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%
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%
2/13/2026 Wells 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%


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 168 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), California State Teachers Retirement System ($877.17K), and Braidwell LP ($822.74K).

Institutional investors have bought a total of 13,525,510 shares in the last 24 months. This purchase volume represents approximately $383.59M 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 8/24/2026. New 13F filings are added each quarter as they're published.
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