Short interest in ProShares UltraShort Lehman 20 Year Treasury (ARCA:TBT) increased during the last reporting period, rising from 1.14M to 1.23M. This put -% of the company's publicly available shares short.

Short interest for ProShares UltraShort Lehman 20 Year Treasury gives investors a sense of the degree to which investors are betting on the decline of ProShares UltraShort Lehman 20 Year Treasury's stock. Short interest data is updated every two weeks.

Based on the recent average volume of 394.47K shares traded per day, it would take 3.12 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.