Short interest in ProShares UltraPro S&P 500 (ARCA:UPRO) increased during the last reporting period, rising from 1.24M to 2.15M. This put -% of the company's publicly available shares short.

Short interest for ProShares UltraPro S&P 500 gives investors a sense of the degree to which investors are betting on the decline of ProShares UltraPro S&P 500's stock. Short interest data is updated every two weeks.

Based on the recent average volume of 3.51M 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.