Short interest in Atara Biotherapeutics Inc (NASDAQ:ATRA) increased during the last reporting period, rising from 543.95K to 551.47K. This put 9.69% of the company's publicly available shares short.

Short interest for Atara Biotherapeutics gives investors a sense of the degree to which investors are betting on the decline of Atara Biotherapeutics's stock. Short interest data is updated every two weeks.

Based on the recent average volume of 80.55K shares traded per day, it would take 6.85 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.