<SEC-DOCUMENT>0001085146-25-005168.txt : 20250814
<SEC-HEADER>0001085146-25-005168.hdr.sgml : 20250814
<ACCEPTANCE-DATETIME>20250814124159
ACCESSION NUMBER:		0001085146-25-005168
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250814
DATE AS OF CHANGE:		20250814

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AECOM
		CENTRAL INDEX KEY:			0000868857
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-ENGINEERING SERVICES [8711]
		ORGANIZATION NAME:           	07 Trade & Services
		EIN:				611088522
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0930

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-83090
		FILM NUMBER:		251216504

	BUSINESS ADDRESS:	
		STREET 1:		13355 NOEL ROAD
		STREET 2:		SUITE 400
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75240
		BUSINESS PHONE:		(972) 788-1000

	MAIL ADDRESS:	
		STREET 1:		13355 NOEL ROAD
		STREET 2:		SUITE 400
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75240

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AECOM TECHNOLOGY CORP
		DATE OF NAME CHANGE:	19901017

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PRIMECAP MANAGEMENT CO/CA/
		CENTRAL INDEX KEY:			0000763212
		ORGANIZATION NAME:           	
		EIN:				953868081

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		177 EAST COLORADO BLVD.
		STREET 2:		11TH FLOOR
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91105
		BUSINESS PHONE:		6263049222

	MAIL ADDRESS:	
		STREET 1:		177 EAST COLORADO BLVD.
		STREET 2:		11TH FLOOR
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91105
</SEC-HEADER>
<DOCUMENT>
<TYPE>SCHEDULE 13G/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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  <headerData>
    <submissionType>SCHEDULE 13G/A</submissionType>
    <previousAccessionNumber>0001104659-17-014285</previousAccessionNumber>
    <filerInfo>
      <filer>
        <filerCredentials>
          <!-- Field: Pseudo-Tag; ID: Name; Data: PRIMECAP MANAGEMENT CO/CA/ -->
          <cik>0000763212</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



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  </headerData>
  <formData>
    <coverPageHeader>
      <amendmentNo>10</amendmentNo>
      <securitiesClassTitle>COM</securitiesClassTitle>
      <eventDateRequiresFilingThisStatement>06/30/2025</eventDateRequiresFilingThisStatement>
      <issuerInfo>
        <issuerCik>0000868857</issuerCik>
        <issuerName>AECOM</issuerName>
        <issuerCusip>00766T100</issuerCusip>
        <issuerPrincipalExecutiveOfficeAddress>
          <com:street1>13355 Noel Road</com:street1>
          <com:street2>Suite 400</com:street2>
          <com:city>Dallas</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>75240</com:zipCode>
        </issuerPrincipalExecutiveOfficeAddress>
      </issuerInfo>
      <designateRulesPursuantThisScheduleFiled>
        <designateRulePursuantThisScheduleFiled>Rule 13d-1(b)</designateRulePursuantThisScheduleFiled>
      </designateRulesPursuantThisScheduleFiled>
    </coverPageHeader>
    <coverPageHeaderReportingPersonDetails>


      <reportingPersonName>PRIMECAP MANAGEMENT CO/CA/</reportingPersonName>
      <citizenshipOrOrganization>X1</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>9256652.00</soleVotingPower>
        <sharedVotingPower>0.00</sharedVotingPower>
        <soleDispositivePower>9580852.00</soleDispositivePower>
        <sharedDispositivePower>0.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>9580852.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
      <classPercent>7.24</classPercent>
      <typeOfReportingPerson>IA</typeOfReportingPerson>
    </coverPageHeaderReportingPersonDetails>
    <items>
      <item1>
        <issuerName>AECOM</issuerName>
        <issuerPrincipalExecutiveOfficeAddress>13355 Noel Road, Suite 400, Dallas, TEXAS 75240</issuerPrincipalExecutiveOfficeAddress>
      </item1>
      <item2>
        <filingPersonName>PRIMECAP MANAGEMENT CO/CA/</filingPersonName>
        <principalBusinessOfficeOrResidenceAddress>177 EAST COLORADO BLVD.
11TH FLOOR
PASADENA, California
91105</principalBusinessOfficeOrResidenceAddress>
        <citizenship>PRIMECAP MANAGEMENT CO/CA/ - UNITED STATES</citizenship>
      </item2>
      <item3>
        <notApplicableFlag>N</notApplicableFlag>
        <typeOfPersonFiling>IA</typeOfPersonFiling>
      </item3>
      <item4>
        <amountBeneficiallyOwned>9,580,852</amountBeneficiallyOwned>
        <classPercent>7.24</classPercent>
        <numberOfSharesPersonHas>
          <solePowerOrDirectToVote>PRIMECAP MANAGEMENT CO/CA/ - 9,256,652</solePowerOrDirectToVote>
          <sharedPowerOrDirectToVote>PRIMECAP MANAGEMENT CO/CA/ - 0</sharedPowerOrDirectToVote>
          <solePowerOrDirectToDispose>PRIMECAP MANAGEMENT CO/CA/ - 9,580,852</solePowerOrDirectToDispose>
          <sharedPowerOrDirectToDispose>PRIMECAP MANAGEMENT CO/CA/ - 0</sharedPowerOrDirectToDispose>
        </numberOfSharesPersonHas>
      </item4>
      <item5>
        <notApplicableFlag>Y</notApplicableFlag>
      </item5>
      <item6>
        <notApplicableFlag>Y</notApplicableFlag>
      </item6>
      <item7>
        <notApplicableFlag>Y</notApplicableFlag>
      </item7>
      <item8>
        <notApplicableFlag>Y</notApplicableFlag>
      </item8>
      <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>PRIMECAP MANAGEMENT CO/CA/</reportingPersonName>
      <signatureDetails>
        <signature>Jorge A. Rodriguez</signature>
        <title>Deputy Chief Compliance Officer</title>
        <date>08/13/2025</date>
      </signatureDetails>
    </signatureInformation>
  </formData>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
