Short interest in State Street SPDR Portfolio S&P 500 ETF (ARCA:SPYM) decreased during the last reporting period, falling from 21.26M to 19.62M. This put -% of the company's publicly available shares short.

Based on the recent average volume of 19.11M shares traded per day, it would take 1.03 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.