<SEC-DOCUMENT>0001193125-21-243565-index.html : 20210811 <SEC-HEADER>0001193125-21-243565.hdr.sgml : 20210811 <ACCEPTANCE-DATETIME>20210811172452 ACCESSION NUMBER: 0001193125-21-243565 CONFORMED SUBMISSION TYPE: S-3ASR PUBLIC DOCUMENT COUNT: 5 FILED AS OF DATE: 20210811 DATE AS OF CHANGE: 20210811 EFFECTIVENESS DATE: 20210811 FILER: COMPANY DATA: COMPANY CONFORMED NAME: Montrose Environmental Group, Inc. CENTRAL INDEX KEY: 0001643615 STANDARD INDUSTRIAL CLASSIFICATION: SERVICES-MANAGEMENT CONSULTING SERVICES [8742] IRS NUMBER: 464195044 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: S-3ASR SEC ACT: 1933 Act SEC FILE NUMBER: 333-258730 FILM NUMBER: 211164669 BUSINESS ADDRESS: STREET 1: 1 PARK PLAZA, SUITE 1000 CITY: IRVINE STATE: CA ZIP: 92614 BUSINESS PHONE: (949) 988-3500 MAIL ADDRESS: STREET 1: 1 PARK PLAZA, SUITE 1000 CITY: IRVINE STATE: CA ZIP: 92614 </SEC-HEADER> <DOCUMENT> <TYPE>S-3ASR <SEQUENCE>1 <FILENAME>d37690ds3asr.htm <DESCRIPTION>S-3ASR <TEXT> Document 1 - file: d37690ds3asr.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-5.1 <SEQUENCE>2 <FILENAME>d37690dex51.htm <DESCRIPTION>EX-5.1 <TEXT> Document 2 - file: d37690dex51.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-23.1 <SEQUENCE>3 <FILENAME>d37690dex231.htm <DESCRIPTION>EX-23.1 <TEXT> Document 3 - file: d37690dex231.htm
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>4 <FILENAME>g37690g99g91.jpg <DESCRIPTION>GRAPHIC <TEXT> Document 4 - file: g37690g99g91.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>5 <FILENAME>g37690gibsondunn.jpg <DESCRIPTION>GRAPHIC <TEXT> Document 5 - file: g37690gibsondunn.jpg
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