NYSEARCA:CPST Calamos S&P 500 Structured Alt Protection ETF - September (CPST) Price, Holdings, & News $26.68 +0.01 (+0.02%) As of 03:21 PM Eastern This is a fair market value price provided by Polygon.io. Learn more. Add Compare Share Share Stock Analysis Stock AnalysisChartHoldingsOwnershipBuy This Stock About Calamos S&P 500 Structured Alt Protection ETF - September (NYSEARCA:CPST) 30 days 90 days 365 days Advanced Chart View Price History Chart DataSkip Price History Chart Get CPST alerts:Sign Up Key Stats Today's Range$26.68▼$26.7050-Day Range$26.13▼$26.6752-Week Range$24.63▼$26.72Volume3,323 shsAverage Volume3,657 shsMarket Capitalization$26.68 millionAssets Under Management$30.05 millionDividend YieldN/ANet Expense Ratio0.69%Aggregate RatingN/A ETF Overview The Calamos S&P 500 Structured Alt Protection ETF - September (CPST) is an exchange-traded fund that mostly invests in large cap equity. Calamos S&P 500 Structured Alt Protection ETFTM September (the Fund) seeks to provide investment results that, before taking fees and expenses into account, match the positive price return of the SPDR S&P 500 ETF Trust (Underlying ETF) up to a cap of 7.50% (the Cap). CPST was launched on Sep 3, 2024 and is issued by Calamos. Read More Calamos S&P 500 Structured Alt Protection ETF - September ExpensesTypeCPSTLarge Cap ETFsEquity ETFsNYSEARCA ETFsAll ETFsManagement Fee0.69%0.58%0.56%0.51%0.53%Other Expenses0.00%0.27%0.56%0.59%0.56%Total Expense0.69%0.65%0.76%0.74%0.73%Fee Waiver0.00%-0.23%-0.66%-0.71%-0.63%Net Expense0.69%0.62%0.63%0.58%0.60% Receive CPST Stock News and Ratings via Email Sign-up to receive the latest news and ratings for Calamos S&P 500 Structured Alt Protection ETF - September and its competitors with MarketBeat's FREE daily newsletter. 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Since then, CPST shares have increased by 5.4% and is now trading at $26.6750. Who are Calamos S&P 500 Structured Alt Protection ETF - September's major shareholders? Top institutional shareholders of Calamos S&P 500 Structured Alt Protection ETF - September include Burkett Financial Services LLC (0.35%). How do I buy shares of Calamos S&P 500 Structured Alt Protection ETF - September? Shares of CPST stock can be purchased through any online brokerage account. Popular online brokerages with access to the U.S. stock market include Charles Schwab, E*TRADE, Fidelity, and Vanguard Brokerage Services. Fund Details IssuerCalamos Advisors Fund NameCalamos S&P 500 Structured Alt Protection ETF - September Tax ClassificationRegulated Investment Company Stock ExchangeNYSEARCACurrent SymbolNYSEARCA:CPST Inception Date8/29/2024 Fund ManagerEli Pars, Jason Hill, David O'Donohue, Jimmy Young, Anthony Vecchiolla WebN/A PhoneN/AFund Focus Asset ClassEquity BenchmarkN/A CategorySize and Style FocusLarge Cap Development LevelDeveloped Markets RegionNorth America Number of Holdings5 Fund Statistics Assets Under Management$30.05 million Average Daily Volume$0.00 Discount/Premium-0.05% Administrator, Advisor and Custodian AdministratorState Street Bank and Trust Company AdvisorCalamos Advisors, LLC CustodianState Street Bank and Trust Company DistributorCalamos Financial Services LLC Transfer AgentState Street Bank and Trust Company TrusteeN/A Lead Market MakerWolverine Trading Miscellaneous Outstanding Shares1,000,000BetaN/A Creation Unit25,000 Creation Fee$250.00 Options Trading Made Easy - Download NowLearn the basics of options trading and how to use them to boost returns and manage risk with this free report from MarketBeat. Click the link below to get your free copy.Get This Free Report Top 4 CPST Holdings4Spy 250829 C 0.79 4Spy 250829 C 0.79Holding Weight: 103.74%4Spy 250829 P 563.68 4Spy 250829 P 563.68Holding Weight: 0.56%UsdHolding Weight: 0.02%4Spy 250829 C 606.01 4Spy 250829 C 606.01Holding Weight: -4.32%Full Holdings DetailsCPST Geographic ExposureCPST Currency Exposure This page (NYSEARCA:CPST) was last updated on 9/12/2025 by MarketBeat.com Staff From Our PartnersMarket Panic: Trump Just Dropped a Bomb on Your Stockstock Market Panic: Trump Just Dropped a Bomb on Your Stocks The market is in freefall—and Trump's new tarif...American Alternative | SponsoredTrump’s national nightmare is herePorter Stansberry and Jeff Brown say a new U.S. national emergency is already underway — and it could trigger ...Porter & Company | SponsoredForget NVDA. Put $1,000 into this stock nowA massive money shift is underway in the AI market. 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