<SEC-DOCUMENT>0001418660-25-000034.txt : 20250814
<SEC-HEADER>0001418660-25-000034.hdr.sgml : 20250814
<ACCEPTANCE-DATETIME>20250814142623
ACCESSION NUMBER:		0001418660-25-000034
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:			Montrose Environmental Group, Inc.
		CENTRAL INDEX KEY:			0001643615
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-MANAGEMENT CONSULTING SERVICES [8742]
		ORGANIZATION NAME:           	07 Trade & Services
		EIN:				464195044
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-92095
		FILM NUMBER:		251217525

	BUSINESS ADDRESS:	
		STREET 1:		4 PARK PLAZA, SUITE 790
		CITY:			IRVINE
		STATE:			CA
		ZIP:			92614
		BUSINESS PHONE:		(949) 988-3500

	MAIL ADDRESS:	
		STREET 1:		4 PARK PLAZA, SUITE 790
		CITY:			IRVINE
		STATE:			CA
		ZIP:			92614

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MANAGED ACCOUNT ADVISORS LLC
		CENTRAL INDEX KEY:			0001418660
		ORGANIZATION NAME:           	
		EIN:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1228

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		101 HUDSON STREET
		CITY:			JERSEY CITY
		STATE:			NJ
		ZIP:			07302
		BUSINESS PHONE:		201-557-4069

	MAIL ADDRESS:	
		STREET 1:		101 HUDSON STREET
		CITY:			JERSEY CITY
		STATE:			NJ
		ZIP:			07302

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MANAGED ACCOUNT ADVISORS, LLC
		DATE OF NAME CHANGE:	20141114

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MANAGED ACCOUNT ADVISORS LLC
		DATE OF NAME CHANGE:	20071115
</SEC-HEADER>
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<TYPE>SCHEDULE 13G/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
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    <previousAccessionNumber>0001418660-25-000009</previousAccessionNumber>
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    <coverPageHeader>
      <amendmentNo>2</amendmentNo>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <eventDateRequiresFilingThisStatement>06/30/2025</eventDateRequiresFilingThisStatement>
      <issuerInfo>
        <issuerCik>0001643615</issuerCik>
        <issuerName>Montrose Environmental Group, Inc.</issuerName>
        <issuerCusip>615111101</issuerCusip>
        <issuerPrincipalExecutiveOfficeAddress>
          <com:street1>4 PARK PLAZA, SUITE 790</com:street1>
          <com:street2>4 PARK PLAZA, SUITE 790</com:street2>
          <com:city>IRVINE</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>92614</com:zipCode>
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        <designateRulePursuantThisScheduleFiled>Rule 13d-1(b)</designateRulePursuantThisScheduleFiled>
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      <reportingPersonName>MANAGED ACCOUNT ADVISORS, LLC</reportingPersonName>
      <memberGroup>b</memberGroup>
      <citizenshipOrOrganization>DE</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
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        <sharedDispositivePower>306419.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>957130.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <classPercent>2.7</classPercent>
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        <issuerName>Montrose Environmental Group, Inc.</issuerName>
        <issuerPrincipalExecutiveOfficeAddress>4 PARK PLAZA, SUITE 790, 4 PARK PLAZA, SUITE 790, IRVINE, CALIFORNIA, 92614.</issuerPrincipalExecutiveOfficeAddress>
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        <filingPersonName>MANAGED ACCOUNT ADVISORS LLC</filingPersonName>
        <principalBusinessOfficeOrResidenceAddress>101 HUDSON STREET
9TH FLOOR
JERSEY CITY, NJ 07302</principalBusinessOfficeOrResidenceAddress>
        <citizenship>Delaware</citizenship>
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        <classPercent>2.7%</classPercent>
        <numberOfSharesPersonHas>
          <solePowerOrDirectToVote>0.00</solePowerOrDirectToVote>
          <sharedPowerOrDirectToVote>0.00</sharedPowerOrDirectToVote>
          <solePowerOrDirectToDispose>650,711.00</solePowerOrDirectToDispose>
          <sharedPowerOrDirectToDispose>306,419.00</sharedPowerOrDirectToDispose>
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      </item4>
      <item5>
        <classOwnership5PercentOrLess>Y</classOwnership5PercentOrLess>
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        <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 &amp;#167; 240.14a-11.

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      </item10>
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    <signatureInformation>
      <reportingPersonName>MANAGED ACCOUNT ADVISORS, LLC</reportingPersonName>
      <signatureDetails>
        <signature>John Capelli</signature>
        <title>Authorized Signatory</title>
        <date>08/13/2025</date>
      </signatureDetails>
    </signatureInformation>
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