MKS Instruments is trading at $211.07, up +8.27% after hours on November 4 after reporting Q3 results above estimates. - The regular-session close was $194.95. - Q3 adjusted EPS was $4.18 and sales were $1.413 billion, beating estimates of $3.63 and $1.355 billion. - The report cited record revenue, AI-driven semiconductor and packaging demand, and Q4 revenue guidance of $1.45–$1.53 billion as key positives.