Chuck Royce acquired 919 Thousand MKS Instruments shares worth $118 Million. That's 1.07% of their equity portfolio (5th largest holding). The investor owns 1.38% of the outstanding MKS Instruments stock. The first MKS Instruments trade was made in Q1 2013. Since then Chuck Royce bought shares seventeen more times and sold shares on 27 occasions. The stake costed the investor $31.9 Million, netting the investor a gain of 271% so far.