Joel Greenblatt acquired 379k Omnicom Group shares worth $29.7M. That's 0.17% of their equity portfolio (84th largest holding). The first Omnicom Group trade was made in Q2 2011. Since then Joel Greenblatt bought shares 30 more times and sold shares on 26 occasions. The stake costed the investor $28.9M, netting the investor a gain of 3.0% so far.