Seth Klarman's position in Atara Biotherapeutics is currently worth $14.5 Million. That's 0.28% of their equity portfolio (25th largest holding). The investor owns 9.35% of the outstanding Atara Biotherapeutics stock. The first Atara Biotherapeutics trade was made in Q4 2014. Since then Seth Klarman bought shares ten more times and sold shares on three occasions. The investor's estimated purchase price is $208 Million, resulting in a loss of 93%.