Calamos S&P 500 Structured Alt Protection ETF - September (CPST) Institutional Ownership $26.45 -0.01 (-0.04%) Closing price 04:10 PM EasternExtended Trading$26.46 +0.01 (+0.03%) As of 04:10 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 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 - September (NYSEARCA:CPST)CurrentInstitutional OwnershipPercentage12.12%Number ofInstitutional Buyers(last 12 months)2TotalInstitutional Inflows(last 12 months)$542.19KNumber ofInstitutional Sellers(last 12 months)1TotalInstitutional Outflows(last 12 months)$55.13K Get CPST Insider Trade Alerts Want to know when executives and insiders are buying or selling Calamos S&P 500 Structured Alt Protection ETF - September stock? Sign up for InsiderTrades.com's daily newsletter to get the latest insider transactions delivered to your inbox daily. Email Address Calamos S&P 500 Structured Alt Protection ETF - September Major Shareholders & Ownership History Export to ExcelReporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails7/1/2025 Burkett Financial Services LLC3,481$91K0.0%-21.7%0.348% 4/11/2025 Burkett Financial Services LLC4,445$112K0.0%-21.1%0.445% 2/12/2025OLD Mission Capital LLC24,384$617K0.0%+185.1%0.000% 10/8/2024 Burkett Financial Services LLC5,635$141K0.1%N/A0.000% (Data available from 1/1/2016 forward) CPST Institutional Ownership - Frequently Asked Questions Who are the largest shareholders of CPST shares? During the previous two years, the following institutional investors and hedge funds held shares of Calamos S&P 500 Structured Alt Protection ETF - September shares: OLD Mission Capital LLC ($617K), Burkett Financial Services LLC ($91K).Learn more on Calamos S&P 500 Structured Alt Protection ETF - September's institutional investors. What percentage of Calamos S&P 500 Structured Alt Protection ETF - September's stock is owned by institutional investors? 12.12% of Calamos S&P 500 Structured Alt Protection ETF - September's stock is owned by institutional investors. Learn more on CPST's institutional investor holdings. Which institutional investors have been buying Calamos S&P 500 Structured Alt Protection ETF - September's stock? The following institutional investors have purchased Calamos S&P 500 Structured Alt Protection ETF - September's stock in the last 24 months: OLD Mission Capital LLC ($15.83K), and Burkett Financial Services LLC ($5.64K). How much institutional buying is happening at Calamos S&P 500 Structured Alt Protection ETF - September? Institutional investors have bought a total of 21,467 shares in the last 24 months. This purchase volume represents approximately $542.19K in transactions. Which of Calamos S&P 500 Structured Alt Protection ETF - September's major shareholders have been selling company stock? The following institutional investors have sold Calamos S&P 500 Structured Alt Protection ETF - September stock in the last 24 months: Burkett Financial Services LLC ($2.15K). How much institutional selling is happening at Calamos S&P 500 Structured Alt Protection ETF - September? Institutional investors have sold a total of 2,154 shares in the last 24 months. This volume of shares sold represents approximately $55.13K in transactions. Related Companies FT Vest U.S. Equity Equal Weight Buffer ETF - June Institutional Ownership Bancreek International Large Cap ETF Institutional Ownership Calamos Nasdaq Equity & Income ETF Institutional Ownership Calamos S&P 500Structured Alt Protection ETF- February Institutional Ownership NestYield Total Return Guard ETF Institutional Ownership AllianzIM U.S. Large Cap Buffer10 Mar ETF Institutional Ownership Global X S&P 500 Quality Dividend ETF Institutional Ownership Calamos Nasdaq-100 Structured Alt Protection ETF - September Institutional Ownership FT Vest U.S. Equity Equal Weight Buffer ETF - September Institutional Ownership AllianzIM U.S. Large Cap Buffer10 Jun ETF Institutional Ownership This page (NYSEARCA:CPST) was last updated on 8/14/2025 by MarketBeat.com Staff From Our PartnersGENIUS Act: Cancel Your Money?A new law called the GENIUS Act could quietly trigger the most radical shift in American finance in decades. 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