Calamos S&P 500Structured Alt Protection ETF – March (NYSEARCA:CPSR – Get Free Report) saw a significant increase in short interest in July. Institutional Investors Weigh In On Calamos S&P 500Structured Alt Protection ETF – MarchA hedge fund recently raised its position in Calamos S&P 500Structured Alt Protection ETF – March stock. Get Calamos S&P 500Structured Alt Protection ETF - March alerts:Calamos S&P 500Structured Alt Protection ETF – March Stock Down 0.1%NYSEARCA CPSR traded down $0.02 during trading hours on Wednesday, hitting $25.91. Calamos S&P 500Structured Alt Protection ETF – March has a 52 week low of $24.35 and a 52 week high of $25.93. Calamos S&P 500Structured Alt Protection ETF – March Company ProfileThe Calamos S&P 500® Structured Alt Protection ETF – March (CPSR) is an exchange-traded fund that mostly invests in large cap equity.