<SEC-DOCUMENT>0001564590-19-001304-index.html : 20190129
<SEC-HEADER>0001564590-19-001304.hdr.sgml : 20190129
<ACCEPTANCE-DATETIME>20190129163140
ACCESSION NUMBER:		0001564590-19-001304
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20190129
ITEM INFORMATION:		Results of Operations and Financial Condition
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20190129
DATE AS OF CHANGE:		20190129

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MKS INSTRUMENTS INC
		CENTRAL INDEX KEY:			0001049502
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
		IRS NUMBER:				042277512
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-23621
		FILM NUMBER:		19549055

	BUSINESS ADDRESS:	
		STREET 1:		2 TECH DRIVE
		STREET 2:		SUITE 201
		CITY:			ANDOVER
		STATE:			MA
		ZIP:			01810
		BUSINESS PHONE:		978-645-5500

	MAIL ADDRESS:	
		STREET 1:		2 TECH DRIVE
		STREET 2:		SUITE 201
		CITY:			ANDOVER
		STATE:			MA
		ZIP:			01810
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>mksi-8k_20190129.htm
<DESCRIPTION>8-K
<TEXT>
Document 1 - file: mksi-8k_20190129.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>mksi-ex991_6.htm
<DESCRIPTION>EX-99.1
<TEXT>
Document 2 - file: mksi-ex991_6.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>gvbfy0pckrjt000001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: gvbfy0pckrjt000001.jpg

</DOCUMENT>
</SEC-DOCUMENT>