Montrose Environmental at a Glance

Our Revenue is Resilient Due to Regulatory Underpinning and Diverse Customer Base Revenue retention is strong and consistent: clients generating 95%+ revenue in FY2021 repeated in FY2022, consistent Revenue End Market Mix 2022 with prior years Approximately 5,600 clients in 8.3% 2022; largest client represents ~14% of revenue 8.5% . 89%/11% revenue split between private and public clients 3.2% 0.6% 3.9% 8.2% 22.9% 9.5% 11.3% 10.1% ■Manufacturing ■ Oil & Gas Fed / State / Local Gov ■Media Utilities Renewable Energy ■Consumer Products 13.2% Technical Services Chemicals Other ■Aerospace © 2023 Montrose Environmental Group, Inc. Proprietary. | 9

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