MKSI

MKS Instruments, Inc., known by its ticker MKSI on the Nasdaq, is a United States–based global manufacturer of instrumentation and systems used to monitor and control vacuum processes in manufacturing and research. The company applies vacuum, pressure, flow, and temperature measurement technologies across several industries, with a primary emphasis on semiconductor fabrication.

Its product portfolio includes vacuum gauges and controllers, mass flow controllers, deposition and plasma processing equipment, and RF power sources. The firm's equipment is used to monitor and regulate process environments in plasmas, thin-film deposition, and related applications, as well as to characterize material properties during production and testing.

MKS Instruments operates globally, with manufacturing, engineering, and service facilities located in North America, Europe, and Asia. It serves semiconductor manufacturers and research institutions, among others, providing both hardware and software solutions as well as calibration and repair services.

Since going public, the company has expanded its portfolio and capabilities through a series of strategic acquisitions and internal development aimed at increasing automation, integration, and geographic reach. MKSI emphasizes research and development to maintain leadership in vacuum and process-control instrumentation for advanced manufacturing.