Buy Atara's T-Cell Potential, Stock Could Nearly Double: Canaccord By: Benzinga via Benzinga September 09, 2015 at 09:04 AM EDT The share price of Atara Biotherapeutics, Inc. (NASDAQ: ATRA) has risen almost 8 percent over the past trading five ... Read More >> Related Stocks: Amgen Atara Biotherap Celgene Corp