Short interest in ProShares Ultra S&P500 (ARCA:SSO) increased during the last reporting period, rising from 1.18M to 1.39M. This put -% of the company's publicly available shares short.

Based on the recent average volume of 2.89M shares traded per day, it would take 1 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.