Calamos S&P 500 Structured Alt Protection ETF – September (NYSEARCA:CPST) Shares Shorted: Short Interest Up 199.7% in September

Posted by Tyrone Williams on Oct 14th, 2026

Calamos S&P 500 Structured Alt Protection ETF – September (NYSEARCA:CPST – Get Free Report) was the target of a significant growth in short interest during 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. Based on an average trading volume of 6,827 shares, the short-interest ratio is presently 1.7 days. Currently, 0.8% of the company’s shares are short sold.

Calamos S&P 500 Structured Alt Protection ETF – September Stock Down 0.0%

CPST stock opened at $28.23 on Wednesday. Calamos S&P 500 Structured Alt Protection ETF – September has a twelve month low of $26.68 and a twelve month high of $28.30. The stock has a market capitalization of $42.34 million, a price-to-earnings ratio of -14.26 and a beta of 0.19. The firm’s fifty day simple moving average is $28.09 and its two-hundred day simple moving average is $27.79.

Hedge Funds Weigh In On Calamos S&P 500 Structured Alt Protection ETF – September

An institutional investor recently raised its stake in Calamos S&P 500 Structured Alt Protection ETF – September stock. Burkett Financial Services LLC boosted its position 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 13F filing with the Securities and Exchange Commission. The fund owned 4,598 shares of the company’s stock after purchasing an additional 1,178 shares during the period. Burkett Financial Services LLC owned about 0.35% of Calamos S&P 500 Structured Alt Protection ETF – September worth $129,000 as of its most recent SEC filing. 12.12% of the stock is currently owned by institutional investors.

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.