TETRA TECH INC

We provide services to a diverse base of U.S. federal government, U.S. state and local government, U.S. commercial and international clients. The following table presents the percentage of our revenue by client sector:

(2)Includes revenue generated from non-U.S. clients, primarily in the United Kingdom, Australia and Canada.

U.S. federal government agencies are significant clients. The U.S. Agency for International Development accounted for 13.0%, 12.2% and 11.0% of our revenue in fiscal 2024, 2023 and 2022, respectively. The Department of Defense ("DoD") accounted for 8.5%, 8.9% and 9.7% of our revenue in fiscal 2024, 2023 and 2022, respectively. We typically support multiple programs within a single U.S. federal government agency, both domestically and internationally. We also assist U.S. state and local government clients in various jurisdictions across the United States. Our international clients are primarily focused in Canada, Australia, Europe and the United Kingdom, and consist of a relatively equal sized mix of government and commercial clients. Our U.S. commercial clients include companies in the chemical, energy, pharmaceutical, retail, aerospace and automotive industries. No single client, except for the U.S. federal government clients, accounted for more than 10% of our revenue in fiscal 2024.