Short interest in Calamos S&P 500 Structured Alt Protection ETF September (ARCA:CPST) decreased during the last reporting period, falling from 7.71K to 7.12K. This put -% of the company's publicly available shares short.

Based on the recent average volume of 2.26K shares traded per day, it would take 3.15 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.