Short interest in State Street SPDR Portfolio S&P 400 Mid Cap ETF (ARCA:SPMD) increased during the last reporting period, rising from 1.19M to 6.28M. This put -% of the company's publicly available shares short.

Based on the recent average volume of 4.19M shares traded per day, it would take 1.5 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.