Montrose Environmental Group, Inc.

For the period ended Dec 31, 2025. Filed Feb 26, 2026.

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FY2025 · Filed Feb 26, 2026

ONT$23.66+0.3%Stored close · as of Nov 10, 2026

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Contents

Denotes management compensatory plan or arrangement.

Filed herewith.

** Furnished herewith.

(a)

Previously filed on June 29, 2020 as an exhibit to the Company’s Registration Statement on Form S-1 (File No. 333-239542) and incorporated herein by reference.

(b)

Previously filed on July 14, 2020 as an exhibit to Amendment No. 1 to the Company’s Registration Statement on Form S-1 (File No. 333-239542) and incorporated herein by reference.

(c)

Previously filed on December 21, 2021 as an exhibit to the Company’s Current Report on Form 8-K and incorporated herein by reference.

(d)

Previously filed on February 29, 2024 as an exhibit to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023 and incorporated herein by reference.

(e)

Previously filed on May 14, 2024 as an exhibit to the Company’s Current Report on Form 8-K and incorporated herein by reference.

(f)

Previously filed on January 6, 2025 as an exhibit to the Company’s Current Report on Form 8-K and incorporated herein by reference.

(g)

Previously filed on March 3, 2025 as an exhibit to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024 and incorporated herein by reference.

(h)

Previously filed on May 9, 2025 as an exhibit to the Company’s Current Report on Form 8-K and incorporated herein by reference.

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