Short interest in Calamos S&P 500 Structured Alt Protection ETF - October (ARCA:CPSO) increased during the last reporting period, rising from 17.98K to 19.42K. This put -% of the company's publicly available shares short.

Based on the recent average volume of 2.57K shares traded per day, it would take 7.56 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.