Chuck Royce acquired 915k MKS Instruments shares worth $93.1M. That's 0.89% of their equity portfolio (4th largest holding). The investor owns 1.34% of the outstanding MKS Instruments stock. The first MKS Instruments trade was made in Q1 2013. Since then Chuck Royce bought shares nineteen more times and sold shares on 30 occasions. The stake costed the investor $32.7M, netting the investor a gain of 185% so far.