X0306 4 2021-01-01 0 0001643615 Montrose Environmental Group, Inc. MEG 0001817845 Revuelta Jose 1 PARK PLAZA, SUITE 1000 IRVINE CA 92614 0 1 0 0 Chief Strategy Officer Stock Option (Right to Buy) 30.96 2021-01-01 4 A 0 18148 0.00 A 2031-01-01 Common Stock 18148 18148 D This option represents the right to purchase a total of 18,148 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. /s/ Nasym Afsari, Attorney In Fact 2021-01-08