NYSEARCA:CPST Calamos S&P 500 Structured Alt Protection ETF - September (CPST) Price, Holdings, & News $26.60 0.00 (0.00%) Closing price 03:21 PM EasternExtended Trading$26.61 +0.01 (+0.03%) As of 04:01 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 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$26.56▼$26.6750-Day Range$26.08▼$26.5952-Week Range$24.63▼$26.67Volume11,908 shsAverage Volume3,520 shsMarket Capitalization$26.60 millionAssets Under Management$28.55 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. Submit View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. Text HELP for help/customer support. Unsubscribe at any time by replying "STOP" to any text message that you receive from MarketBeat or by visiting our mailing preferences page. Read our full terms of service and privacy policy. CPST ETF News HeadlinesNo headlines for this company have been tracked by MarketBeat.com CPST ETF - Frequently Asked Questions How have CPST shares performed this year? Calamos S&P 500 Structured Alt Protection ETF - September's stock was trading at $25.32 at the beginning of 2025. Since then, CPST shares have increased by 5.1% and is now trading at $26.60. Who are Calamos S&P 500 Structured Alt Protection ETF - September's major shareholders? Calamos S&P 500 Structured Alt Protection ETF - September's top institutional shareholders 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$28.55 million Average Daily Volume$0.00 Discount/Premium0.04% 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 Analysts Agree—These Gold Picks Outshine the RestUnlock the timeless value of gold with our exclusive 2025 Gold Forecasting Report. 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Whether you're planning for future generations or seeking a reliable asset in turbulent times, this report is your essential guide to making informed decisions.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 9/5/2025 by MarketBeat.com Staff From Our PartnersHow “Trump’s New Dollar” Could Impact Your WealthPresident Trump just signed a game-changing law… That could soon upgrade the U.S. dollar in your checking a...Brownstone Research | SponsoredForget Tesla — This Tiny AI Stock Is Musk’s Real PlayWhile Wall Street focused on Tesla’s earnings, Elon Musk was quietly building a supercomputer so powerful it c...Behind the Markets | SponsoredRetire Comfortably with These New Monthly Income ETFs?Too many retirees lie awake at night, worried their savings won’t last. 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