    <SEC-DOCUMENT>0001193125-25-069838-index.html : 20250401
    <SEC-HEADER>0001193125-25-069838.hdr.sgml : 20250401
    <ACCEPTANCE-DATETIME>20250401084117
    ACCESSION NUMBER:		0001193125-25-069838
    CONFORMED SUBMISSION TYPE:	ARS
    PUBLIC DOCUMENT COUNT:		1
    CONFORMED PERIOD OF REPORT:	20241231
    FILED AS OF DATE:		20250401
    DATE AS OF CHANGE:		20250401
    EFFECTIVENESS DATE:		20250401

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			MKS INSTRUMENTS INC
    		CENTRAL INDEX KEY:			0001049502
    		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
    		ORGANIZATION NAME:           	08 Industrial Applications and Services
    		EIN:				042277512
    		STATE OF INCORPORATION:			MA
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		ARS
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-23621
    		FILM NUMBER:		25796835

    	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>ARS
    <SEQUENCE>1
    <FILENAME>d909750dars.pdf
    <DESCRIPTION>ARS
    <TEXT>
    Document 1 - file: d909750dars.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>