X0306 4 2021-01-01 0 0001643615 Montrose Environmental Group, Inc. MEG 0001817948 Manthripragada Vijay 1 PARK PLAZA, SUITE 1000 IRVINE CA 92614 1 1 0 0 See Remarks Stock Option (Right to Buy) 30.96 2021-01-01 4 A 0 36295 0.00 A 2031-01-01 Common Stock 36295 36295 D This option represents the right to purchase a total of 36,295 shares of the Common Stock which will vest in three equal annual installments on January 1, 2022, January 1, 2023, and January 1, 2024, subject to the Reporting Person's continued service to the Issuer. President and Chief Executive Officer /s/ Nasym Afsari, Attorney In Fact 2021-01-08