X0306 4 2021-03-18 0 0001643615 Montrose Environmental Group, Inc. MEG 0001817948 Manthripragada Vijay 1 PARK PLAZA, SUITE 1000 IRVINE CA 92614 1 1 0 0 President and CEO Stock Option (Right to Buy) 47.72 2021-03-18 4 A 0 21125 0.00 A 2031-03-18 Common Stock 21125 21125 D This option represents the right to purchase a total of 21,125 shares of the Common Stock which will vest in two equal installments on September 18, 2021 and March 18, 2022, subject to the Reporting Person's continued service to the Issuer. /s/ Nasym Afsari, Attorney In Fact 2021-03-19