Joel Greenblatt's position in MKS Instruments is currently worth $3.03 Million. That's 0.05% of their equity portfolio (452nd largest holding). The first MKS Instruments trade was made in Q4 2010. Since then Joel Greenblatt bought shares 26 more times and sold shares on 25 occasions. The stake costed the investor $1.29 Million, netting the investor a gain of 136% so far.