MONTROSE ENVIRONMENTAL GROUP, INC. (a Delaware corporation) 2,500,000 Shares of Common Stock UNDERWRITING AGREEMENTMontrose Environmental Group, Inc. • September 30th, 2021 • Services-management consulting services • New York
Montrose Environmental Group, Inc., a Delaware corporation (the “Company”), confirms its agreement with J.P. Morgan Securities LLC (“JPM”), BofA Securities, Inc. (“BofA”), William Blair & Company, L.L.C. (“William Blair”) and each of the other Underwriters named in Schedule A hereto (collectively, the “Underwriters,” which term shall also include any underwriter substituted as hereinafter provided in Section 10 hereof), for whom JPM, BofA and William Blair are acting as representatives (in such capacity, the “Representatives”), with respect to (i) the sale by the Company and the purchase by the Underwriters, acting severally and not jointly, of the respective numbers of shares of Common Stock, par value $0.000004 per share, of the Company (“Common Stock”) set forth in Schedule A hereto and (ii) the grant by the Company to the Underwriters, acting severally and not jointly, of the option described in Section 2(b) hereof to purchase all or any part of 375,000 additional shares of Common
