<SEC-DOCUMENT>0001127602-21-014262-index.html : 20210422
<SEC-HEADER>0001127602-21-014262.hdr.sgml : 20210422
<ACCEPTANCE-DATETIME>20210422150339
ACCESSION NUMBER:		0001127602-21-014262
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210413
FILED AS OF DATE:		20210422
DATE AS OF CHANGE:		20210422

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Gitin Mark Milton
		CENTRAL INDEX KEY:			0001842711

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-23621
		FILM NUMBER:		21844467

	MAIL ADDRESS:	
		STREET 1:		MKS INSTRUMENTS, INC., 2 TECH DRIVE
		STREET 2:		SUITE 201
		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>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>form4a.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
Document 1 - file: form4a.html

Document 1 - RAW XML: form4a.xml

</DOCUMENT>
</SEC-DOCUMENT>