Chuck Royce acquired 1.12 Million MKS Instruments shares worth $138 Million. That's 1.24% of their equity portfolio (3rd largest holding). The investor owns 1.75% 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 26 occasions. The stake costed the investor $38.9 Million, netting the investor a gain of 255% so far.