Tetra Tech's 'Leading with Science' Drives Global Growth in 2025

TL;DR

**TTEK is a solid buy, leveraging its 'Leading with Science' approach and global reach to dominate critical water and environmental infrastructure markets.**

AI Summary

TETRA TECH INC (TTEK) reported a strong fiscal year ended September 28, 2025, emphasizing its position as a leading global provider of high-end consulting and engineering services focused on water, environment, and sustainable infrastructure. The company's revenue distribution showed its Government Services Group (GSG) contributing 49.1% and its Commercial/International Services Group (CIG) contributing 52.3% of total revenue, indicating a slight shift towards government services from 47.8% in 2024. TTEK worked on over 100,000 projects across more than 100 countries with over 25,000 associates, leveraging its 'Leading with Science' approach, which integrates advanced analytics, AI, machine learning, and digital technology solutions. Key business changes include the continued expansion of its proprietary Tetra Tech Delta technologies, offering customized and scalable software subscriptions for clients. Risks include those related to foreign operations and the competitive landscape in the engineering industry. The strategic outlook focuses on solving global challenges in water and the environment, aiming for long-term sustainable consulting, engineering, and technology solutions.

Why It Matters

Tetra Tech's strong performance and focus on sustainable infrastructure, water, and environmental solutions are critical for investors seeking exposure to growing global demands for climate resilience and resource management. The company's extensive project portfolio, exceeding 100,000 projects in fiscal 2025, demonstrates its significant market penetration and competitive edge, particularly in areas like water treatment and environmental management where it holds #1 ENR rankings. For employees, TTEK's commitment to innovation through its Tetra Tech Delta technologies and T4 knowledge transfer system offers continuous professional development and engagement. Customers benefit from TTEK's high-end consulting and engineering, delivering one-of-a-kind solutions for complex challenges like coastal erosion and real-time water management, ensuring long-term value and sustainability.

Risk Assessment

Risk Level: medium — The company operates globally, with projects in over 100 countries, exposing it to significant foreign operation risks, including currency fluctuations and geopolitical instability. While the filing highlights a strong market position, the competitive landscape in the engineering industry, as noted in Item 1, 'Competition,' could impact future contract wins and profitability. The reliance on government contracts (49.1% of revenue) also introduces risks related to government funding cycles and policy changes.

Analyst Insight

Investors should consider TTEK for long-term portfolio exposure, given its leadership in critical environmental and infrastructure sectors and its innovative 'Leading with Science' strategy. Monitor the company's backlog and new contract announcements, especially within its Government Services Group, for continued growth indicators and potential impacts from government spending trends.

Financial Highlights

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operating Margin

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total Debt

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net Income

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revenue Growth

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Revenue Breakdown

Key Numbers

• 49.1% — GSG Revenue Percentage (Increased from 47.8% in fiscal 2024, indicating growth in government contracts.)
• 52.3% — CIG Revenue Percentage (Slightly decreased from 53.6% in fiscal 2024, but still represents the larger segment.)
• 100,000+ — Projects Worked On (Demonstrates extensive global reach and operational capacity in fiscal 2025.)
• 100+ — Countries of Operation (Highlights the company's global footprint and diverse client base.)
• 25,000+ — Associates Worldwide (Indicates a large, skilled workforce supporting global operations.)
• 12 years — #1 Ranking in Water Treatment and Desalination (Showcases sustained market leadership and expertise.)

Key Players & Entities

• TETRA TECH INC (company) — registrant
• TTEK (company) — trading symbol
• Nasdaq National Market (regulator) — stock exchange
• Engineering News-Record (company) — industry's leading magazine
• Government Services Group (company) — reportable segment
• Commercial/International Services Group (company) — reportable segment
• $7.6 billion (dollar_amount) — market value of common stock held by non-affiliates on March 30, 2025
• 260,828,236 (dollar_amount) — shares of common stock outstanding on November 7, 2025

FAQ

Risk Factors

• Competition in the Engineering Industry [medium — market]: Tetra Tech operates in a highly competitive landscape with numerous domestic and international firms offering similar consulting and engineering services. This competition could impact pricing, market share, and profitability.
• Foreign Operations Risks [medium — operational]: The company's significant international presence exposes it to risks associated with foreign currency fluctuations, political instability, differing regulatory environments, and economic conditions in the countries where it operates.
• Government Contract Compliance [medium — regulatory]: A substantial portion of revenue is derived from government contracts, which are subject to stringent regulations, audits, and potential changes in government spending priorities. Non-compliance could lead to penalties or loss of contracts.
• Dependence on Key Personnel [medium — operational]: The company relies on the expertise of its skilled workforce, particularly its domain experts. The loss of key personnel or an inability to attract and retain talent could negatively affect service delivery and growth.
• Technological Advancements and Digital Solutions [low — market]: While Tetra Tech leverages advanced analytics, AI, and digital technologies, rapid technological changes could necessitate continuous investment and adaptation to remain competitive and meet evolving client demands for innovative solutions.

Industry Context

Tetra Tech operates in the global consulting and engineering services sector, with a strong focus on water, environment, and sustainable infrastructure. The industry is characterized by a competitive landscape with both large international firms and smaller specialized companies. Key trends include increasing demand for climate mitigation and adaptation services, digital transformation in engineering, and a growing emphasis on sustainable solutions.

Regulatory Implications

As a significant provider of services to government entities, Tetra Tech must adhere to strict compliance requirements for government contracts. Changes in government spending priorities or regulatory frameworks related to environmental protection and infrastructure can impact demand for its services.

What Investors Should Do

1. Monitor revenue mix between GSG and CIG.
2. Assess the impact of 'Leading with Science' and Tetra Tech Delta technologies.
3. Evaluate the company's performance in its #1 ranked market segments.
4. Analyze the company's global operational risks.

Key Dates

• 2025-09-28: Fiscal Year End — Marks the end of the reporting period for the 10-K filing, providing the latest financial and operational data.

Glossary

Leading with Science

Tetra Tech's approach to providing innovative solutions by integrating advanced analytics, AI, machine learning, and digital technology. (Highlights the company's strategy to differentiate itself and deliver high-end consulting and engineering services.)

Government Services Group (GSG)

A reportable segment focused on providing services to government clients. (Represents a significant portion of Tetra Tech's revenue, indicating the importance of government contracts.)

Commercial/International Services Group (CIG)

A reportable segment focused on providing services to commercial and international clients. (Represents the other major segment of Tetra Tech's business, showcasing its global commercial reach.)

Tetra Tech Delta technologies

Proprietary software solutions offered by Tetra Tech, including customized and scalable software subscriptions. (Demonstrates the company's investment in technology and its strategy to offer digital solutions to clients.)

Engineering News-Record (ENR)

A leading industry magazine that ranks companies in the engineering and construction sector. (Tetra Tech's #1 rankings in multiple categories, including Water Treatment and Desalination for 12 years, underscore its market leadership and expertise.)

Year-Over-Year Comparison

The fiscal year 2025 reporting shows a slight increase in the Government Services Group's revenue contribution to 49.1%, up from 47.8% in fiscal 2024, while the Commercial/International Services Group's share decreased slightly to 52.3% from 53.6%. The company continues to emphasize its 'Leading with Science' approach and expansion of proprietary technologies, indicating ongoing strategic focus. No new significant risks were highlighted in the provided text, but the existing risks related to foreign operations and competition remain relevant.

Key Financial Figures

• $0.01 — ange on which registered Common Stock, $0.01 par value TTEK The NASDAQ Stock Market

Filing Documents

• ttek-20250928.htm (10-K) — 2507KB
• ttekex43q42025.htm (EX-4.3) — 31KB
• ttekex191q42025.htm (EX-19.1) — 32KB
• ttekex192q42025.htm (EX-19.2) — 42KB
• ttek-ex21q42025.htm (EX-21) — 14KB
• ttek-ex23q42025.htm (EX-23) — 2KB
• ttek-ex311q42025.htm (EX-31.1) — 9KB
• ttek-ex312q42025.htm (EX-31.2) — 9KB
• ttek-ex321q42025.htm (EX-32.1) — 5KB
• ttek-ex322q42025.htm (EX-32.2) — 5KB
• ttek-ex95q42025.htm (EX-95) — 15KB
• ttekex971q42025.htm (EX-97.1) — 36KB
• image_0a.jpg (GRAPHIC) — 118KB
• image_2.jpg (GRAPHIC) — 91KB
• image_3a.jpg (GRAPHIC) — 0KB
• ttek-20250928_g1.jpg (GRAPHIC) — 84KB
• 0000831641-25-000032.txt ( ) — 14781KB
• ttek-20250928.xsd (EX-101.SCH) — 94KB
• ttek-20250928_cal.xml (EX-101.CAL) — 162KB
• ttek-20250928_def.xml (EX-101.DEF) — 408KB
• ttek-20250928_lab.xml (EX-101.LAB) — 1133KB
• ttek-20250928_pre.xml (EX-101.PRE) — 796KB
• ttek-20250928_htm.xml (XML) — 2280KB

Business

Business 3 General 3 Leading with Science 4 Reportable Segments 4 Government Services Group 5 Commercial/International Services Group 6 Project Examples 7 Clients 7 Contracts 7 Growth Strategy 8 Sustainability Program 9 Acquisitions and Divestitures 9 Competition 10 Backlog 10 Regulations 11 Seasonality 11 Climate Risk Assessment 11 Risk Management and Insurance 12 Human Capital Management 12 Executive Officers of the Registrant 13 Available Information 14 Item 1A

Risk Factors

Risk Factors 14 Item 1B Unresolved Staff Comments 29 Item 2

Properties

Properties 30 Item 3

Legal Proceedings

Legal Proceedings 30 Item 4 Mine Safety Disclosures 30 PART II Item 5 Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities 31 Item 6 [Reserved] 32 Item 7

Management's Discussion and Analysis of Financial Condition and Results of Operations

Management's Discussion and Analysis of Financial Condition and Results of Operations 32 Item 7A

Quantitative and Qualitative Disclosures about Market Risk

Quantitative and Qualitative Disclosures about Market Risk 44 Item 8

Financial Statements and Supplementary Data

Financial Statements and Supplementary Data 45 Item 9 Changes in and Disagreements with Accountants on Accounting and Financial Disclosure 88 Item 9A

Controls and Procedures

Controls and Procedures 88 Item 9B Other Information 88 PART III Item 10 Directors, Executive Officers and Corporate Governance 88 Item 11

Executive Compensation

Executive Compensation 89 Item 12

Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters 89 Item 13 Certain Relationships and Related Transactions, and Director Independence 89 Item 14 Principal Accounting Fees and Services 89 PART IV Item 15 Exhibits, Financial Statement Schedules 89 Index to Exhibits 91 Item 16 Form 10-K Summary 94

Signatures

Signatures 93 2 This Annual Report on Form 10-K ("Report"), including the "Management's Discussion and Analysis of Financial Condition and Results of Operations," contains forward-looking statements regarding future events and our future results that are subject to the safe harbors created under the Securities Act of 1933 (the "Securities Act") and the Securities Exchange Act of 1934 (the "Exchange Act"). All statements other than statements of historical facts are statements that could be deemed forward-looking statements. These statements are based on current expectations, estimates, forecasts and projections about the industries in which we operate and the beliefs and assumptions of our management. Words such as "expects," "anticipates," "targets," "goals," "projects," "intends," "plans," "believes," "estimates," "seeks," "continues," "may," variations of such words and similar expressions are intended to identify such forward-looking statements. In addition, statements that refer to projections of our future financial performance, our anticipated growth and trends in our businesses and other characterizations of future events or circumstances are forward-looking statements. Readers are cautioned that these forward-looking statements are only predictions and are subject to risks, uncertainties and assumptions that are difficult to predict, including those identified below under "Risk Factors," and elsewhere herein. Therefore, actual results may differ materially and adversely from those expressed in any forward-looking statements. We undertake no obligation to revise or update publicly any forward-looking statements for any reason. PART I

Business

Item 1. Business General Te tra Tech, Inc. ("Tetra Tech") is a leading global provider of high-end consulting and engineering services that focuses on water, environment and sustainable infrastructure. We are a global company that is Leading with Science to provide innovative solutions for our public and private clients. We typically begin at the earliest stage of a project by identifying technical solutions and developing execution plans tailored to our clients' needs and resources. Tetra Tech is Leading with Science to provide sustainable and resilient solutions to our clients' most complex needs. Engineering News-Record ("ENR"), the engineering industry's leading magazine, has ranked Tetra Tech #1 in Water Treatment and Desalination for 12 years in a row. In 2025, we were also ranked #1 in consulting studies, environmental management, environmental science, wind power, hydro plants, site assessment and compliance, and green government offices. ENR also ranked Tetra Tech in the Top 10 in numerous categories, including dams and reservoirs, marine and port facilities, power, solar power, solid waste, chemical and soil remediation, and hazardous waste. Our reputation for high-end consulting and engineering services and our ability to develop solutions for water and environmental management has supported our growth for more than 50 years. Our market leading climate mitigation and adaptation services are solving our clients' most complex challenges related to coastal flooding, water security, energy transition and biodiversity protection. Today, we are proud to be making a difference in people's lives worldwide through our high-end consulting, engineering and technology service offerings. In fiscal 2025, we worked on over 100,000 projects, in more than 100 countries on all seven continents, with more than 25,000 associates. We are Leading with Science throughout our operations, with domain experts across multiple disciplines supported by our advanced analytics, ar

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