<SEC-DOCUMENT>0001127602-19-004281-index.html : 20190206
<SEC-HEADER>0001127602-19-004281.hdr.sgml : 20190206
<ACCEPTANCE-DATETIME>20190206143543
ACCESSION NUMBER:		0001127602-19-004281
CONFORMED SUBMISSION TYPE:	5
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20181231
FILED AS OF DATE:		20190206
DATE AS OF CHANGE:		20190206

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			COLELLA GERARD G
		CENTRAL INDEX KEY:			0001256715

	FILING VALUES:
		FORM TYPE:		5
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-23621
		FILM NUMBER:		19570897

	MAIL ADDRESS:	
		STREET 1:		6 SHATTUCK RD
		CITY:			ANDOVER
		STATE:			MA
		ZIP:			01810

ISSUER:		

	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

	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>
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<TYPE>5
<SEQUENCE>1
<FILENAME>form5.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
Document 1 - file: form5.html

Document 1 - RAW XML: form5.xml

</DOCUMENT>
</SEC-DOCUMENT>