Joel Greenblatt acquired 529k Schlumberger Ltd. shares worth $19M. That's 0.11% of their equity portfolio (233rd largest holding). The first Schlumberger Ltd. trade was made in Q2 2013. Since then Joel Greenblatt bought shares 22 more times and sold shares on 24 occasions. The stake costed the investor $18.8M, netting the investor a gain of 1.3% so far.