Calamos S&P 500 Structured Alt Protection ETF - October (CPSO) Chart & Stock Price History $26.75 +0.01 (+0.04%) As of 09/19/2025 04:10 PM Eastern 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 4.98%. In the past month, the fund has increased 0.83%, reflecting recent market activity. As of the latest close, Calamos S&P 500 Structured Alt Protection ETF - October traded at $26.75 with a market cap of $18.73 million and volume of 338 shares. 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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Read our full terms of service and privacy policy. 5 Day Performance+0.07%1 Month Performance+0.83%3 Month Performance+2.96%Year-To-Date Performance+4.98% CPSO Stock Chart for Sunday, September, 21, 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 Capitalization09/19/2025$26.74$26.75+0.04%$26.75$26.75338 shs$18.73 million09/18/2025$26.73$26.74+0.04%$26.74$26.72338 shs$18.72 million09/17/2025$26.73$26.73$26.73$26.731,504 shs$18.71 million09/16/2025$26.73$26.73$26.73$26.731,504 shs$18.71 million09/15/2025$26.73$26.73$26.73$26.731,504 shs$18.71 million09/12/2025$26.72$26.73+0.04%$26.73$26.731,504 shs$18.71 million09/11/2025$26.70$26.72+0.07%$26.72$26.691,504 shs$18.70 million09/10/2025$26.69$26.70+0.04%$26.71$26.68196 shs$18.69 million09/09/2025$26.68$26.69+0.04%$26.69$26.69210 shs$18.68 million09/08/2025$26.68$26.68$26.69$26.66210 shs$18.68 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. 09/05/2025$26.67$26.68+0.04%$26.68$26.64824 shs$18.68 million09/04/2025$26.64$26.67+0.11%$26.67$26.67167 shs$18.67 million09/03/2025$26.61$26.64+0.11%$26.64$26.60167 shs$18.65 million09/02/2025$26.64$26.61-0.11%$26.61$26.61425 shs$18.63 million09/01/2025$26.64$26.64$26.64$26.64425 shs$18.65 million08/29/2025$26.65$26.64-0.04%$26.64$26.64425 shs$18.65 million08/28/2025$26.63$26.65+0.08%$26.65$26.62425 shs$18.66 million08/27/2025$26.61$26.63+0.08%$26.63$26.63270 shs$18.64 million08/26/2025$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 million Related Companies DFVE Stock Chart QRMI Stock Chart RSDE Stock Chart SIXZ Stock Chart CPNM Stock Chart IWFG Stock Chart QNXT Stock Chart SZNE Stock Chart CPSP Stock Chart CPNQ 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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