Calamos S&P 500 Structured Alt Protection ETF - October (CPSO) Institutional Ownership $26.68 +0.00 (+0.01%) Closing price 09:06 AM EasternExtended Trading$26.68 0.00 (0.00%) As of 09:06 AM 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 Polygon.io. Learn more. Add Compare Share Share Ownership Stock AnalysisChartHoldingsOwnershipBuy This Stock Institutional Ownership Changes (13F Filings) for Calamos S&P 500 Structured Alt Protection ETF - October (NYSEARCA:CPSO)Number ofInstitutional Buyers(last 12 months)11TotalInstitutional Inflows(last 12 months)$19.29MNumber ofInstitutional Sellers(last 12 months)3TotalInstitutional Outflows(last 12 months)$1.95M Get CPSO Insider Trade Alerts Want to know when executives and insiders are buying or selling Calamos S&P 500 Structured Alt Protection ETF - October stock? 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Skip Chart & View Institutional Buying and Selling Data CPSO Institutional Buying and Selling by Quarter Calamos S&P 500 Structured Alt Protection ETF - October Major Shareholders & Ownership History Export to ExcelReporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails8/8/2025Calamos Advisors LLC256,972$6.74M0.0%+26.6%38.070% 7/29/2025Calamos Wealth Management LLC18,613$488K0.0%-50.8%2.757% 7/28/2025Harbour Investments Inc.2,557$67K0.0%-43.4%0.379% 5/14/2025Capital Analysts LLC11,151$283K0.0%+19.0%1.784% 5/12/2025Sloy Dahl & Holst LLC10,740$273K0.0%+14.3%1.481% 5/8/2025Harbour Investments Inc.4,515$114K0.0%+27.7%0.623% 4/29/2025Calamos Advisors LLC202,948$5.15M0.0%-21.3%27.993% 3/17/2025Wealth Enhancement Advisory Services LLC102,197$2.60M0.0%N/A14.096% 3/12/2025Centaurus Financial Inc.83,166$2.12M0.1%N/A10.396% 2/17/2025Cetera Investment Advisers8,486$216K0.0%N/A0.000% 2/14/2025Capital Analysts LLC9,373$239K0.0%N/A0.000% 2/13/2025Envestnet Asset Management Inc.221,348$5.64M0.0%N/A0.000% 2/12/2025Tucker Asset Management LLC1,782$45K0.0%N/A0.000% 2/10/2025Harbour Investments Inc.3,535$90K0.0%N/A0.000% 2/10/2025Commonwealth Equity Services LLC33,068$842K0.0%N/A0.000% 2/10/2025VanWeelden Wealth Management LLC225,027$5.73M5.2%N/A0.000% 1/27/2025Sloy Dahl & Holst LLC9,400$239K0.0%N/A0.000% (Data available from 1/1/2016 forward) CPSO Institutional Ownership - Frequently Asked Questions Who are the largest shareholders of CPSO shares? During the previous two years, 12 institutional investors and hedge funds held shares of Calamos S&P 500 Structured Alt Protection ETF - October. The most heavily invested institutionals were Calamos Advisors LLC ($6.74M), VanWeelden Wealth Management LLC ($5.73M), Envestnet Asset Management Inc. ($5.64M), Wealth Enhancement Advisory Services LLC ($2.60M), Centaurus Financial Inc. ($2.12M), Commonwealth Equity Services LLC ($842K), and Calamos Wealth Management LLC ($488K).Learn more on Calamos S&P 500 Structured Alt Protection ETF - October's institutional investors. Which institutional investors have been buying Calamos S&P 500 Structured Alt Protection ETF - October's stock? Of the 11 institutional investors that purchased Calamos S&P 500 Structured Alt Protection ETF - October's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: VanWeelden Wealth Management LLC ($225.03K), Envestnet Asset Management Inc. ($221.35K), Wealth Enhancement Advisory Services LLC ($102.20K), Centaurus Financial Inc. ($83.17K), Calamos Advisors LLC ($54.02K), Commonwealth Equity Services LLC ($33.07K), and Capital Analysts LLC ($11.15K). How much institutional buying is happening at Calamos S&P 500 Structured Alt Protection ETF - October? Institutional investors have bought a total of 755,504 shares in the last 24 months. This purchase volume represents approximately $19.29M in transactions. Which of Calamos S&P 500 Structured Alt Protection ETF - October's major shareholders have been selling company stock? The following institutional investors have sold Calamos S&P 500 Structured Alt Protection ETF - October stock in the last 24 months: Calamos Advisors LLC ($54.94K), Calamos Wealth Management LLC ($19.19K), and Harbour Investments Inc. ($1.96K). How much institutional selling is happening at Calamos S&P 500 Structured Alt Protection ETF - October? Institutional investors have sold a total of 76,081 shares in the last 24 months. This volume of shares sold represents approximately $1.95M in transactions. Related Companies DFVE Institutional Ownership RSDE Institutional Ownership QRMI Institutional Ownership SIXZ Institutional Ownership CPNM Institutional Ownership QNXT Institutional Ownership SEPT Institutional Ownership SZNE Institutional Ownership CPNQ Institutional Ownership QRFT Institutional Ownership This page (NYSEARCA:CPSO) was last updated on 9/9/2025 by MarketBeat.com Staff From Our PartnersWhy Trump’s “Smart Dollar” could rewrite the rulesMUST SEE: Donald Trump's Radical Overhaul of the U.S. Dollar Congress just approved President Trump's lates...Stansberry Research | SponsoredBuffett, Gates and Bezos Dumping StocksThe world's wealthiest individuals are making huge moves with their money. 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