Calamos S&P 500 Structured Alt Protection ETF – September (NYSEARCA:CPST) Sees Large Growth in Short Interest

Posted by Stephan Jacobs on Oct 13th, 2026

Calamos S&P 500 Structured Alt Protection ETF – September (NYSEARCA:CPST – Get Free Report) was the recipient of a significant growth in short interest in the month of September. As of September 30th, there was short interest totaling 11,693 shares, a growth of 199.7% from the September 15th total of 3,901 shares. Currently, 0.8% of the company’s shares are sold short. Based on an average daily volume of 6,827 shares, the days-to-cover ratio is currently 1.7 days.

Institutional Investors Weigh In On Calamos S&P 500 Structured Alt Protection ETF – September

A hedge fund recently raised its position in Calamos S&P 500 Structured Alt Protection ETF – September stock. Burkett Financial Services LLC raised its stake in shares of Calamos S&P 500 Structured Alt Protection ETF – September (NYSEARCA:CPST – Free Report) by 34.4% during the 3rd quarter, according to its most recent filing with the Securities and Exchange Commission. The institutional investor owned 4,598 shares of the company’s stock after acquiring an additional 1,178 shares during the quarter. Burkett Financial Services LLC owned approximately 0.35% of Calamos S&P 500 Structured Alt Protection ETF – September worth $129,000 at the end of the most recent reporting period. Institutional investors and hedge funds own 12.12% of the company’s stock.

Calamos S&P 500 Structured Alt Protection ETF – September Price Performance

Shares of NYSEARCA:CPST traded down $0.01 during trading on Tuesday, reaching $28.23. 7 shares of the company were exchanged, compared to its average volume of 3,795. The business’s fifty day simple moving average is $28.09 and its 200-day simple moving average is $27.78. The firm has a market capitalization of $42.34 million, a PE ratio of -14.26 and a beta of 0.19. Calamos S&P 500 Structured Alt Protection ETF – September has a 12-month low of $26.68 and a 12-month high of $28.30.

Calamos S&P 500 Structured Alt Protection ETF – September Company Profile

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The Calamos S&P 500 Structured Alt Protection ETF – September (CPST) is an exchange-traded fund that mostly invests in large cap equity. Calamos S&P 500 Structured Alt Protection ETFTM September (the Fund) seeks to provide investment results that, before taking fees and expenses into account, match the positive price return of the SPDR S&P 500 ETF Trust (Underlying ETF) up to a cap of 7.50% (the Cap). CPST was launched on Sep 3, 2024 and is issued by Calamos.