Calamos S&P 500 Structured Alt Protection ETF - September (CPST) Chart & Stock Price History $26.45 -0.01 (-0.04%) Closing price 04:10 PM EasternExtended Trading$26.46 +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 - September Stock Price Performance The Calamos S&P 500 Structured Alt Protection ETF - September (CPST) fund chart highlights key performance trends across multiple timeframes. Since the beginning of the year, the fund increased 4.46%. In the past month, the fund has increased 0.99%, reflecting recent market activity. As of the latest close, Calamos S&P 500 Structured Alt Protection ETF - September traded at $26.46 with a market cap of $26.46 million and volume of 482 shares. 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Email Address 5 Day Performance+0.11%1 Month Performance+0.99%3 Month Performance+3.24%Year-To-Date Performance+4.46% CPST Stock Chart for Thursday, August, 14, 2025 CPST Chart by TradingView Calamos S&P 500 Structured Alt Protection ETF - September 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 Capitalization08/13/2025$26.45$26.46+0.04%$26.46$26.46482 shs$26.46 million08/12/2025$26.42$26.45+0.11%$26.45$26.45482 shs$26.45 million08/11/2025$26.42$26.42$26.42$26.42639 shs$26.42 million08/08/2025$26.37$26.42+0.19%$26.42$26.422 shs$26.42 million08/07/2025$26.38$26.37-0.04%$26.42$26.365,290 shs$26.37 million08/06/2025$26.34$26.38+0.15%$26.38$26.362,571 shs$26.38 million08/05/2025$26.35$26.34-0.04%$26.34$26.316,636 shs$26.34 million08/04/2025$26.25$26.35+0.38%$26.35$26.312,624 shs$26.35 million08/01/2025$26.33$26.25-0.30%$26.26$26.212,305 shs$26.25 million07/31/2025$26.34$26.33-0.04%$26.35$26.314,945 shs$26.33 million Get the Latest News and Ratings for CPST and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Calamos S&P 500 Structured Alt Protection ETF - September and its competitors with MarketBeat's FREE daily newsletter. 07/30/2025$26.34$26.34$26.34$26.313,728 shs$26.34 million07/29/2025$26.35$26.34-0.04%$26.40$26.321,154 shs$26.34 million07/28/2025$26.34$26.35+0.04%$26.36$26.35189 shs$26.35 million07/25/2025$26.32$26.34+0.08%$26.34$26.342 shs$26.34 million07/24/2025$26.31$26.32+0.04%$26.32$26.322 shs$26.32 million07/23/2025$26.27$26.31+0.15%$26.31$26.28316 shs$26.31 million07/22/2025$26.26$26.27+0.04%$26.28$26.24171 shs$26.27 million07/21/2025$26.25$26.26+0.04%$26.31$26.254,258 shs$26.26 million07/18/2025$26.24$26.25+0.04%$26.25$26.25325 shs$26.25 million07/17/2025$26.20$26.24+0.15%$26.26$26.207,929 shs$26.24 million07/16/2025$26.19$26.20+0.04%$26.21$26.17282 shs$26.20 million07/15/2025$26.19$26.19$26.19$26.16689 shs$26.19 million07/14/2025$26.18$26.19+0.04%$26.19$26.16907 shs$26.19 million Related Companies Calamos S&P 500Structured Alt Protection ETF- February Stock Chart First Trust S&P 500 Diversified Dividend Aristocrats ETF Stock Chart Bancreek International Large Cap ETF Stock Chart Calamos Nasdaq-100 Structured Alt Protection ETF - September Stock Chart Calamos Nasdaq Equity & Income ETF Stock Chart FT Vest U.S. Equity Equal Weight Buffer ETF - September Stock Chart AllianzIM U.S. Large Cap Buffer10 Jun ETF Stock Chart Acquirers Small and Micro Deep Value ETF Stock Chart JPMorgan U.S. Research Enhanced Large Cap ETF Stock Chart Parametric Equity Plus ETF Stock Chart Receive CPST Stock News and Ratings via EmailSign-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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