UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended January 1, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 0-19655 TETRA TECH, INC. (Exact name of registrant as specified in its charter) Delaware 95-4148514 (State or other jurisdiction of ...

Tetra Tech, Inc. (NASDAQ:TTEK) Q1 2023 Earnings Conference Call February 2, 2023 11:00 AM ET Company Participants Dan Batrack - Chairman & Chief Executive Officer Steve Burdick - Chief Financial Officer Jill Hudkins - President Conference Call Participants Noelle Dilts - Stifel Andy Wittmann - Baird Alex Dwyer - KeyBanc Tate Sullivan - Maxim Group Michael Dudas - Vertical Research Operator Good morning and thank you for joining the Tetra Tech Earnings Call. As a reminder, Tetra Tech is also simulcasting thi ...

EARNINGS CALL Q1-23February 2, 2023 Dan Batrack, Chairman & CEO Steve Burdick, Executive VP & CFO Jill Hudkins, President WATER ENVIRONMENT SUSTAINABLE INFRASTRUCTURE Leading with Science® Forward Looking Statements & Non-GAAP Financial Measures All statements in this communication other than statements of historical fact are "forward-looking statements" for purposes of federal and state securities laws, including any statements of the plans, strategies and objectives for future operations, profitability, s ...