<SEC-DOCUMENT>0001562230-25-000008.txt : 20250207
<SEC-HEADER>0001562230-25-000008.hdr.sgml : 20250207
<ACCEPTANCE-DATETIME>20250207193847
ACCESSION NUMBER:		0001562230-25-000008
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250207
DATE AS OF CHANGE:		20250207

SUBJECT COMPANY:	

	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
		IRS NUMBER:				042277512
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-58011
		FILM NUMBER:		25603307

	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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Capital International Investors
		CENTRAL INDEX KEY:			0001562230
		ORGANIZATION NAME:           	
		IRS NUMBER:				951411037
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		333 SOUTH HOPE STREET
		STREET 2:		55TH FL
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90071
		BUSINESS PHONE:		213-486-9200

	MAIL ADDRESS:	
		STREET 1:		333 SOUTH HOPE STREET
		STREET 2:		55TH FL
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90071

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Capital Research & Management Co - Division 3
		DATE OF NAME CHANGE:	20121114
</SEC-HEADER>
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<TYPE>SCHEDULE 13G/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
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    <submissionType>SCHEDULE 13G/A</submissionType>
    <previousAccessionNumber>0001562230-20-000037</previousAccessionNumber>
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      <filer>
        <filerCredentials>
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      <liveTestFlag>LIVE</liveTestFlag>



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  <formData>
    <coverPageHeader>
      <amendmentNo>6</amendmentNo>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <eventDateRequiresFilingThisStatement>09/30/2024</eventDateRequiresFilingThisStatement>
      <issuerInfo>
        <issuerCik>0001049502</issuerCik>
        <issuerName>MKS Instruments, Inc.</issuerName>
        <issuerCusip>55306N104</issuerCusip>
        <issuerPrincipalExecutiveOfficeAddress>
          <com:street1>2 Tech Drive</com:street1>
          <com:street2>Ste 201</com:street2>
          <com:city>Andover</com:city>
          <com:stateOrCountry>X1</com:stateOrCountry>
          <com:zipCode>01810</com:zipCode>
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      <designateRulesPursuantThisScheduleFiled>
        <designateRulePursuantThisScheduleFiled>Rule 13d-1(b)</designateRulePursuantThisScheduleFiled>
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    <coverPageHeaderReportingPersonDetails>

      <reportingPersonName>Capital International Investors</reportingPersonName>
      <citizenshipOrOrganization>DE</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>3160389</soleVotingPower>
        <sharedVotingPower>0</sharedVotingPower>
        <soleDispositivePower>3160389</soleDispositivePower>
        <sharedDispositivePower>0</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>3160389.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <classPercent>4.7</classPercent>
      <typeOfReportingPerson>IA</typeOfReportingPerson>
    </coverPageHeaderReportingPersonDetails>
    <items>
      <item1>
        <issuerName>MKS Instruments, Inc.</issuerName>
        <issuerPrincipalExecutiveOfficeAddress>2 Tech Drive, Ste 201, Andover, MA 01810</issuerPrincipalExecutiveOfficeAddress>
      </item1>
      <item2>
        <filingPersonName>Capital International Investors</filingPersonName>
        <principalBusinessOfficeOrResidenceAddress>333 South Hope Street, 55th Fl, Los Angeles, CA  90071
</principalBusinessOfficeOrResidenceAddress>
        <citizenship>N/A</citizenship>
      </item2>
      <item3>
        <notApplicableFlag>N</notApplicableFlag>
        <typeOfPersonFiling>IA</typeOfPersonFiling>
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        <amountBeneficiallyOwned>3,160,389 **

**Capital International Investors ("CII") is a division of Capital Research and Management Company ("CRMC"), as well as its investment management subsidiaries and affiliates Capital Bank and Trust Company, Capital International, Inc., Capital International Limited, Capital International Sarl, Capital International K.K., Capital Group Private Client Services, Inc., and Capital Group Investment Management Private Limited (together with CRMC, the "investment management entities"). CII's divisions of each of the investment management entities collectively provide investment management services under the name "Capital International Investors." CII is deemed to be the beneficial owner of 3,160,389 shares or 4.7% of the 67,287,594 shares believed to be outstanding.</amountBeneficiallyOwned>
        <classPercent>4.7</classPercent>
        <numberOfSharesPersonHas>
          <solePowerOrDirectToVote>3,160,389</solePowerOrDirectToVote>
          <sharedPowerOrDirectToVote>0</sharedPowerOrDirectToVote>
          <solePowerOrDirectToDispose>3,160,389</solePowerOrDirectToDispose>
          <sharedPowerOrDirectToDispose>0</sharedPowerOrDirectToDispose>
        </numberOfSharesPersonHas>
      </item4>
      <item5>
        <classOwnership5PercentOrLess>Y</classOwnership5PercentOrLess>
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      <item9>
        <notApplicableFlag>Y</notApplicableFlag>
      </item9>
      <item10>
        <notApplicableFlag>N</notApplicableFlag>
        <certifications>By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.</certifications>
      </item10>
    </items>
    <signatureInformation>
      <reportingPersonName>Capital International Investors</reportingPersonName>
      <signatureDetails>
        <signature>Jae Won Chung</signature>
        <title>Vice President and Senior Counsel II, Capital Research and Management Company</title>
        <date>02/07/2025</date>
      </signatureDetails>
    </signatureInformation>
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