Joel Greenblatt acquired 447k Interpublic Group Of Cos. shares worth $12M. That's 0.07% of their equity portfolio (413th largest holding). The first Interpublic Group Of Cos. trade was made in Q1 2011. Since then Joel Greenblatt bought shares 31 more times and sold shares on 26 occasions. The stake costed the investor $9.77M, netting the investor a gain of 23% so far.