Joel Greenblatt acquired 13.7 Thousand Northrop Grumman shares worth $6.63 Million. That's 0.07% of their equity portfolio (404th largest holding). The first Northrop Grumman trade was made in Q4 2010. Since then Joel Greenblatt bought shares 26 more times and sold shares on 29 occasions. The stake costed the investor $5.02 Million, netting the investor a gain of 32% so far.