Calamos S&P 500 Structured Alt Protection ETF - September (CPST) Chart & Stock Price History $26.51 +0.01 (+0.04%) As of 08/27/2025 04:10 PM Eastern 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 4.70%. In the past month, the fund has increased 0.61%, reflecting recent market activity. As of the latest close, Calamos S&P 500 Structured Alt Protection ETF - September traded at $26.51 with a market cap of $26.51 million and volume of 763 shares. 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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Read our full terms of service and privacy policy. 5 Day Performance+0.04%1 Month Performance+0.61%3 Month Performance+3.31%Year-To-Date Performance+4.70% CPST Stock Chart for Thursday, August, 28, 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 Capitalization08/27/2025$26.50$26.51+0.04%$26.51$26.51763 shs$26.51 million08/26/2025$26.50$26.50$26.52$26.50763 shs$26.50 million08/25/2025$26.50$26.50$26.51$26.4611,561 shs$26.50 million08/22/2025$26.47$26.50+0.11%$26.50$26.50148 shs$26.50 million08/21/2025$26.48$26.47-0.04%$26.47$26.47148 shs$26.47 million08/20/2025$26.48$26.48$26.48$26.48148 shs$26.48 million08/19/2025$26.48$26.48$26.48$26.48152 shs$26.48 million08/18/2025$26.47$26.48+0.04%$26.48$26.442,191 shs$26.48 million08/15/2025$26.45$26.47+0.08%$26.47$26.442,028 shs$26.47 million08/14/2025$26.46$26.45-0.04%$26.46$26.46148 shs$26.45 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. 08/13/2025$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 million07/30/2025$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 million Related Companies Calamos S&P 500Structured Alt Protection ETF- February Stock Chart First Trust S&P 500 Diversified Dividend Aristocrats ETF Stock Chart Calamos Nasdaq-100 Structured Alt Protection ETF - September Stock Chart FT Vest U.S. Equity Equal Weight Buffer ETF - September Stock Chart Calamos Nasdaq Equity & Income ETF Stock Chart Global X S&P 500 Quality Dividend ETF Stock Chart Direxion Daily S&P 500 High Beta Bear 3X Shares Stock Chart Bancreek International Large Cap ETF Stock Chart AllianzIM U.S. Large Cap Buffer10 Jun ETF Stock Chart JPMorgan U.S. Research Enhanced Large Cap 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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