The current institutional shareholding score of Atara Biotherapeutics Inc is 3.00, ranking 192 out of 387 in the Biotechnology & Medical Research industry. The latest institutional shareholding proportion is 43.48%, representing a quarter-over-quarter decrease of 28.53%. The largest institutional shareholder is Steven Cohen, holding a total of 87.18K shares, representing 2.38% of shares outstanding, with 59.28% decrease in holdings.