FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * LeMaire Joshua W. 2. Issuer Name and Ticker or Trading Symbol Montrose Environmental Group, Inc. [ MEG ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)_____ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
Chief Operating Officer
(Last)         (First)         (Middle)
1 PARK PLAZA, SUITE 1000
3. Date of Earliest Transaction (MM/DD/YYYY)
9/21/2021
(Street)
IRVINE, CA 92614
(City)       (State)       (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)
 
6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock  9/21/2021    M    21665  A $6.03  23865  D   
Common Stock  9/21/2021    S    21665  D $60.11 (1) 2200  D   
Common Stock  9/21/2021    M    8453  A $24.00  10653  D   
Common Stock  9/21/2021    S    8453  D $60.10 (2) 2200  D   
Common Stock  9/21/2021    M    3677  A $31.60  5877  D   
Common Stock  9/21/2021    S    3677  D $60.12 (3) 2200  D   
Common Stock  9/22/2021    M    2577  A $6.03  4777  D   
Common Stock  9/22/2021    S    1596  D $61.03 (4) 3181  D   
Common Stock  9/22/2021    S    981  D $61.89 (5) 2200  D   
Common Stock  9/22/2021    M    2477  A $24.00  4677  D   
Common Stock  9/22/2021    S    1481  D $61.04 (6) 3196  D   
Common Stock  9/22/2021    S    996  D $61.90 (7) 2200  D   
Common Stock  9/22/2021    M    1455  A $31.60  3655  D   
Common Stock  9/22/2021    S    961  D $61.08 (8) 2694  D   
Common Stock  9/22/2021    S    494  D $61.95 (9) 2200  D   

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to Buy)  $6.03  9/21/2021    M        21665    (10) 6/23/2026  Common Stock  21665  $0.00  157286  D   
Stock Option (Right to Buy)  $24.00  9/21/2021    M        8453    (11) 1/10/2029  Common Stock  8453  $0.00  9297  D   
Stock Option (Right to Buy)  $31.60  9/21/2021    M        3677    (12) 1/1/2030  Common Stock  3677  $0.00  14050  D   
Stock Option (Right to Buy)  $6.03  9/22/2021    M        2577    (10) 6/23/2026  Common Stock  2577  $0.00  154709  D   
Stock Option (Right to Buy)  $24.00  9/22/2021    M        2477    (11) 1/10/2029  Common Stock  2477  $0.00  6820  D   
Stock Option (Right to Buy)  $31.60  9/22/2021    M        1455    (12) 1/1/2030  Common Stock  1455  $0.00  12595  D   

Explanation of Responses:
(1)  The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $60.00 to $60.66, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.
(2)  The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $60.00 to $60.66, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.
(3)  The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $60.00 to $60.80, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.
(4)  The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $60.54 to $61.50, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.
(5)  The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $61.54 to $62.38, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.
(6)  The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $60.57 to $61.55, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.
(7)  The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $61.57 to $62.38, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.
(8)  The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $60.60 to $61.57 inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.
(9)  The price reported in Column 4 is a weighted average price. These shares of common stock of the Issuer were sold in multiple transactions by the Reporting Person at prices ranging from $61.60 to $62.38, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of common stock sold at each separate price within the range.
(10)  50% of the shares subject to the option vested on July 13, 2017 and the remaining 50% vested on July 13, 2019.
(11)  33.33% of the shares subject to the option vested on January 10, 2020, 33.33% vested on January 10, 2021 and the remaining balance will vest on January 10, 2022, subject to the Reporting Person's continued service to the Issuer.
(12)  33.33% of the shares subject to the option vested on January 1, 2021, 33.33% will vest on January 1, 2022 and the remaining balance will vest on January 1, 2023, subject to the Reporting Person's continued service to the Issuer.

Remarks:
The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 Trading Plan adopted by the Reporting Person.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
LeMaire Joshua W.
1 PARK PLAZA, SUITE 1000
IRVINE, CA 92614


Chief Operating Officer

Signatures
/s/ Nasym Afsari, Attorney In Fact 9/23/2021
**Signature of Reporting Person Date
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