Ken Fisher acquired 408 Thousand MKS Instruments shares worth $31.5 Million. That's 0.01% of their equity portfolio (264th largest holding). The first MKS Instruments trade was made in Q1 2013. Since then Ken Fisher bought shares fourteen more times and sold shares on 32 occasions. The stake costed the investor $18.1 Million, netting the investor a gain of 75% so far.