Chuck Royce acquired 793 Thousand MKS Instruments shares worth $61.3 Million. That's 0.69% of their equity portfolio (17th largest holding). The investor owns 1.20% of the outstanding MKS Instruments stock. The first MKS Instruments trade was made in Q1 2013. Since then Chuck Royce bought shares eighteen more times and sold shares on 30 occasions. The stake costed the investor $27.9 Million, netting the investor a gain of 120% so far.