Tetra Tech(TTEK) - 2026 Q1 - Quarterly Results

Exhibit 99.1 NEWS RELEASE January 28, 2026 Tetra Tech Reports Strong First Quarter 2026 Results and Raises Fiscal Year 2026 Guidance Pasadena, California. Tetra Tech, Inc. (NASDAQ: TTEK), a leading provider of high-end consulting and engineering services in water, environment and sustainable infrastructure, today announced results for the first quarter ended December 28, 2025. Revenue and revenue, net of subcontractor costs (net revenue), in the first quarter totaled $1.21 billion and $1.04 billion, respect ...