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MKS Instruments, Inc.

Company type	Public
Traded as	Nasdaq: MKSI S&P 400 component
ISIN	US55306N1046
Industry	Semiconductors
Founded	1961; 63 years ago (1961)
Headquarters	Andover, Massachusetts, U.S.
Area served	Worldwide
Number of employees	5,400 (2020)
Website	www.mks.com

Location of MKS Instruments' ESI subsidiary, in Beaverton, Oregon

MKS Instruments, Inc. is an American process control instrumentation company.^[1] It is headquartered in Andover, Massachusetts.^[2]

^ Business, United States Congress House Committee on Small (2008). Examining Expiring Tax Incentives and the Needs of Small Business: Committee on Small Business, United States House of Representatives, One Hundred Tenth Congress, Second Session, Hearing Held September 11, 2008. U.S. Government Printing Office. p. 10. ISBN 978-0-16-081864-6. {{cite book}}: |last= has generic name (help)
^ "MKSI | MKS Instruments Inc. Company Profile & Executives - WSJ". www.wsj.com.