Joel Greenblatt acquired 711k Schlumberger shares worth $40.4M. That's 0.11% of their equity portfolio (200th largest holding). The first Schlumberger trade was made in Q2 2013. Since then Joel Greenblatt bought shares 24 more times and sold shares on 25 occasions. The stake costed the investor $25.5M, netting the investor a gain of 58% so far.