Investor Relations

MKS Instruments is a global provider of instruments, subsystems, and process control solutions that measure, control, power, monitor and analyze critical parameters of advanced manufacturing processes to improve process performance and productivity.  Our products are derived from our core competencies in pressure measurement and control, flow measurement and control, gas and vapor delivery, gas composition analysis, residual gas analysis, leak detection, control and information technology, ozone generation and delivery, RF & DC power, reactive gas generation, vacuum technology, photonics, sub-micron positioning, vibration isolation and optics. 

Our primary served markets include semiconductor capital equipment, general industrial, life sciences and research. 

Please direct questions concerning transfer of shares, lost certificates or related inquiries to:

American Stock Transfer & Trust Company
59 Maiden Lane
New York, New York 10038
Phone: 800-937-5449 (weekdays from 9:00 am to 5:00 pm Eastern time)
Fax: 718-236-2641
www.amstock.com
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