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TTEK · Analysis updated Nov 10, 2026, 6:00 PM ET
Why is Tetra Tech Inc (TTEK) stock moving?
No news items or SEC filings were found for Tetra Tech in the 14-day and 45-day windows, so this analysis rests only on the 30-day price and volume data. The stock closed at 36.81 on Oct 22 and peaked at a 41.09 close on Nov 9, a gain of about 11.6%, before slipping 1.1% to 40.65 on Nov 10. Lows have risen steadily through the period, which points to an uptrend. Volume has mostly run between 1.8M and 3.3M shares. The heaviest sessions came on rising prices (Oct 30 at 3.28M, Nov 4 at 3.20M), and Nov 5 showed a reversal from a 41.74 intraday high to a 40.56 close on 3.18M shares. The Nov 10 pullback came on 2.22M shares, a moderate level. Nearby reference levels are roughly 39.4 to 39.6 (the Nov 2 to Nov 3 closes) below and 41.1 to 41.7 (the Nov 9 close and the Nov 5 high) above. Without a company catalyst, the durability of the move is unclear.
About Tetra Tech Inc
Tetra Tech is a Pasadena-based consulting and engineering firm that does high-end technical work in water, the environment and sustainable infrastructure for government and commercial clients around the world. What sets it apart is its focus on the science-heavy early stages of projects, such as water management, digital water automation and environmental studies, rather than lower-margin construction work.
How it makes money
It earns fees from consulting, engineering, program management and technical services contracts. Its two main segments are Government Services (US federal, state and local, plus international development work) and Commercial/International Services (private-sector clients and governments in places like Canada, the UK and Australia). Revenue for fiscal 2026 (year ending September) was on track for about $5 billion, or about $4.3 billion after subcontractor costs ("net revenue"), with a backlog of about $4.5 billion. Cutbacks to USAID and State Department funding in 2025 took away a once-meaningful source of revenue.
What usually moves TTEK
- US federal and state spending on water and infrastructure
- International development and foreign aid budgets
- Contract wins and backlog growth
- Episodic disaster-response work
- Acquisitions and margin expansion