Calamos S&P 500 Structured Alt Protection ETF - October (CPSO) Chart & Stock Price History $26.82 +0.02 (+0.06%) Closing price 03:05 PM EasternExtended Trading$26.82 -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 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. Over the last 12 months, the fund's price has increased 5.94%, with a year-to-date return of 5.28%. In the past month, the fund has increased 0.36%, reflecting recent market activity. As of the latest close, Calamos S&P 500 Structured Alt Protection ETF - October traded at $26.81 with a market cap of $21.45 million and volume of 70,734 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. Subscribe Now 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. 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Read our full terms of service and privacy policy. 5 Day Performance+0.13%1 Month Performance+0.36%3 Month Performance+2.00%Year-To-Date Performance+5.28%1 Year Performance+5.94% CPSO Stock Chart for Wednesday, October, 15, 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 Capitalization10/14/2025$26.83$26.81-0.07%$26.85$26.7670,734 shs$21.45 million10/13/2025$26.79$26.83+0.15%$26.83$26.793,330 shs$21.46 million10/10/2025$26.84$26.79-0.19%$26.88$26.789,137 shs$21.43 million10/09/2025$26.85$26.84-0.04%$27.00$26.842,099 shs$21.47 million10/08/2025$26.83$26.85+0.07%$26.87$26.8412,389 shs$16.11 million10/07/2025$26.87$26.83-0.15%$26.85$26.834,513 shs$16.10 million10/06/2025$26.84$26.87+0.11%$26.87$26.8512,586 shs$16.12 million10/03/2025$26.84$26.84$26.88$26.8419,956 shs$16.10 million10/02/2025$26.85$26.84-0.04%$26.85$26.8025,379 shs$18.79 million10/01/2025$26.80$26.85+0.19%$26.98$26.80117,126 shs$18.80 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. 09/30/2025$26.76$26.80+0.15%$26.81$26.7514,353 shs$18.76 million09/29/2025$26.75$26.76+0.04%$26.78$26.766,071 shs$18.73 million09/26/2025$26.75$26.75$26.76$26.76140 shs$18.73 million09/25/2025$26.76$26.75-0.04%$26.76$26.751,433 shs$18.73 million09/24/2025$26.75$26.76+0.04%$26.76$26.74131 shs$18.73 million09/23/2025$26.75$26.75$26.75$26.751,300 shs$18.73 million09/22/2025$26.75$26.75$26.75$26.731,300 shs$18.73 million09/19/2025$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 million Related Companies ACGR Stock Chart LIVR Stock Chart CPSN Stock Chart GNOV Stock Chart MVPL Stock Chart NVBT Stock Chart MAYT Stock Chart CPSY Stock Chart AZAA Stock Chart CPSR 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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