08:25 EST Atara Biotherapeutics (ATRA) trading halted, news pending Published first on TheFly – the ultimate source for real-time, market-moving breaking financial news. Try Now>> See the top stocks recommended by analysts >> Read More on ATRA: Twelve option delistings on December 23rd Atara Biotherapeutics initiated with a Buy at Rodman & Renshaw Disclaimer & DisclosureReport an Issue