Tetra Tech: Departure Of Directors Or Principal Officers; Election Of Directors; Appointment Of Principal Officers, Other Events, Financial Statements And Exhibits

Item 5.02.Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers. Appointment of Officer On October 7, 2025, Tetra Tech, Inc. (the “Company”) announced that Roger R. Argus, Executive Vice President, Corporate Development, and President, Commercial/International Services Group, has been promoted to serve as the Company’s President, reporting to Dan L. Batrack, Chairman and Chief Executive Officer. In this role, Mr. Argus will oversee the Company’s global operations, working closely with senior leadership and operational teams to sustain the Company’s exceptional performance and strategic growth. Mr. Argus joined Tetra Tech more than 30 years ago, and has held increasingly responsible positions. He has served as Executive Vice President, Corporate Development since November 2024, and President, Commercial/International Services Group since October 2023. Prior to this, Mr. Argus served as Senior Vice President and President, Government Services Group from October 2018 to October 2024, and President, U.S. Government Division from October 2017 to November 2024. During his tenure with the Company, he also served as project and program manager and business unit leader. He holds a Bachelor of Science in Chemical Engineering from California State University, Long Beach. Item 8.01.Other Events. On October 7, 2025, the Company issued a press release announcing the matters described in Item 5.02. A copy of the press release is attached as Exhibit 99.1 and is incorporated by reference herein. Item 9.01.Financial Statements and Exhibits. (d) Exhibits 99.1Press Release, dated October 7, 2025. 104Cover Page Interactive Data File (embedded within the Inline XBRL document) 2 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. TETRA TECH, INC. Date: October 7, 2025 By: /s/ Dan L. Batrack Dan L. Batrack Chairman and Chief Executive Officer 3

Tetra Tech: Departure Of Directors Or Principal Officers; Election Of Directors; Appointment Of Principal Officers, Other Events, Financial Statements And Exhibits

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