Short interest in Atara Biotherapeutics Inc (NASDAQ:ATRA) decreased during the last reporting period, falling from 639.16K to 636.28K. This put 11.36% 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 100.47K shares traded per day, it would take 6.33 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.