Calamos S&P 500 Structured Alt Protection ETF - October (CPSO) Chart & Stock Price History $26.62 +0.01 (+0.02%) Closing price 09:02 AM EasternExtended Trading$26.62 0.00 (0.00%) As of 09:02 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 Chart Stock AnalysisChartHoldingsOwnershipBuy This Stock Calamos S&P 500 Structured Alt Protection ETF - October Stock Price Performance The Calamos S&P 500 Structured Alt Protection ETF - October (CPSO) fund chart highlights key performance trends across multiple timeframes. Since the beginning of the year, the fund increased 4.45%. In the past month, the fund has increased 0.62%, reflecting recent market activity. As of the latest close, Calamos S&P 500 Structured Alt Protection ETF - October traded at $26.61 with a market cap of $18.63 million and volume of 270 shares. 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Read our full terms of service and privacy policy. 5 Day Performance+0.06%1 Month Performance+0.62%3 Month Performance+3.00%Year-To-Date Performance+4.45% CPSO Stock Chart for Wednesday, August, 27, 2025 CPSO Chart by TradingView Calamos S&P 500 Structured Alt Protection ETF - October Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization08/26/2025$26.61$26.61$26.62$26.57270 shs$18.63 million08/25/2025$26.60$26.61+0.04%$26.61$26.61174 shs$18.63 million08/22/2025$26.53$26.60+0.26%$26.61$26.53174 shs$18.62 million08/21/2025$26.55$26.53-0.08%$26.53$26.50484 shs$18.57 million08/20/2025$26.55$26.55$26.57$26.511,077 shs$18.59 million08/19/2025$26.57$26.55-0.08%$26.55$26.53402 shs$18.59 million08/18/2025$26.56$26.57+0.04%$26.62$26.5337,647 shs$18.60 million08/15/2025$26.53$26.56+0.11%$26.56$26.53127 shs$17.93 million08/14/2025$26.56$26.53-0.11%$26.53$26.52321 shs$18.57 million08/13/2025$26.55$26.56+0.04%$26.56$26.524,308 shs$18.59 million Get the Latest News and Ratings for CPSO and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Calamos S&P 500 Structured Alt Protection ETF - October and its competitors with MarketBeat's FREE daily newsletter. 08/12/2025$26.47$26.55+0.30%$26.55$26.502,065 shs$18.59 million08/11/2025$26.48$26.47-0.04%$26.48$26.47848 shs$17.87 million08/08/2025$26.46$26.48+0.08%$26.48$26.481 shs$17.87 million08/07/2025$26.46$26.46$26.46$26.46896 shs$17.86 million08/06/2025$26.42$26.46+0.15%$26.46$26.46896 shs$17.86 million08/05/2025$26.43$26.42-0.04%$26.42$26.421,720 shs$17.83 million08/04/2025$26.35$26.43+0.30%$26.44$26.441,973 shs$17.84 million08/01/2025$26.42$26.35-0.26%$26.36$26.361,993 shs$17.79 million07/31/2025$26.44$26.42-0.08%$26.44$26.405,323 shs$17.83 million07/30/2025$26.44$26.44$26.48$26.404,322 shs$17.85 million07/29/2025$26.45$26.44-0.04%$26.49$26.44130 shs$17.85 million07/28/2025$26.45$26.45$26.45$26.451 shs$17.85 million Related Companies QRMI Stock Chart SEPT Stock Chart AZAA Stock Chart IWFG Stock Chart MAYT Stock Chart LIVR Stock Chart RSDE Stock Chart CDEI Stock Chart MVPL Stock Chart GNOV Stock Chart Receive CPSO Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Calamos S&P 500 Structured Alt Protection ETF - October and its competitors with MarketBeat's FREE daily newsletter. 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