What changed in this filing

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Item 1. Business

2025-11-20 compared with 2024-11-19 · 88 added, 107 removed, 412 unchanged (32% of the section changed)

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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 2024, we were also ranked #1 in consulting studies;

environmental management;

hydro plants;

offshore and underwater facilities;

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, environmental science, chemical and soil remediation, and hazardous waste.

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.

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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 2024, we worked on over 100,000 projects, in more than 100 countries on all seven continents, with a talent force of 30,000 associates.

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, artificial intelligence ("AI"), machine learning and digital technology solutions.

Our ability to provide innovative and first-of-kind solutions is enhanced by partnerships with our forward-thinking clients.

We are diverse, equitable and inclusive, embracing the breadth of experience across our talented workforce worldwide with a culture of innovation and entrepreneurship.

We embrace the breadth of experience across our talented workforce worldwide with a culture of innovation and entrepreneurship.

We are disciplined in our business, and focused on delivering value to customers and high performance for our shareholders.

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Our people are our number one asset.

Opportunity means new technical challenges that provide advancement within our company, encourage an inclusive and diverse workforce and ensure a safe workplace.

We have a strong project management culture that enables us to deliver on more than 100,000 projects per fiscal year.

Opportunity means new technical challenges that provide advancement within our company and ensure a safe workplace.

We have a strong project management culture that enables us to deliver on more than 100,000 projects per year.

Our client-focused project management is supported by strong fiscal management and financial tools.

We use a disciplined

approach to monitoring, managing and improving our return on investment in each of our business areas through our efforts to negotiate appropriate contract terms, manage our contract performance to minimize schedule delays and cost overruns and promptly bill and collect accounts receivable.

We use a disciplined approach

to monitoring, managing and improving our return on investment in each of our business areas through our efforts to negotiate appropriate contract terms, manage our contract performance to minimize schedule delays and cost overruns, and promptly bill and collect accounts receivable.

We have built a broad client and contract base by proactively understanding our clients' priorities and demonstrating a long track record of s uccessful performance that results in repeat business and limits competition.

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We are often at the leading edge of new challenges where we are delivering one-of-a-kind solutions.

These might be a new water treatment technology, a unique solution to addressing coastal erosion, an AI-enabled system for remote assessment of infrastructure assets or a digital twin for real time management of water treatment systems.

These might be a new water treatment technology, a unique solution to addressing coastal erosion, an AI-enabled system for remote assessment of infrastructure assets or real-time optimization of water management systems.

We combine interdisciplinary capabilities, technical resources and institutional knowledge to implement complex projects that are at the leading edge of policy and technology development for our clients around the world.

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At Tetra Tech, we provide value-generating solutions by combining operational expertise, science and technology.

By Leading with Science® and leveraging our collective technology including advanced data analytics, digital technologies and AI, we create transformational solutions and provide subscription software solutions to our clients.

By Leading with Science® and leveraging our collective technology including advanced data analytics, digital technologies and AI, we create transformational solutions for our clients.

Tetra Tech's proprietary technologies and solutions, referred to collectively as the Tetra Tech Delta, differentiate us in the market and provide us with a competitive advantage.

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Our Tetra Tech Delta technologies are drawn from our decades of operational experience and a reservoir of technical appli cations that are shared throughout our company as well as scalable solutions that are sold externally as software subscriptions.

Our high-end teams connect interdisciplinary experts from across our company's 30,000 staff worldwide.

Our high-end teams connect interdisciplinary experts from across our company's more than 25,000 staff worldwide.

Tetra Tech mobilizes teams that include analysts, statisticians, digital engineers and industry experts who effectively implement value-generating and pragmatic solutions for our clients.

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Tetra Tech Delta is continually expanding and includes cutting-edge tools on interpretive analysis, modeling of physical systems, forecasting and scenario analysis, optimization and operations research.

Our subscription solutions provide our clients with extended capabilities for AI-enabled large scale data management, spatial data interpretation, and ability to build and utilize digital twins for land, coastal and structural assets.

Leading with Science® also means fully leveraging the collective expertise provided by our global workforce of 30,000 associates.

Our subscription solutions provide our clients with extended capabilities for AI-enabled large scale data management, spatial data interpretation, and ability to optimize land, coastal and infrastructure systems.

Leading with Science® also means fully leveraging the collective expertise provided by our global workforce of more than 25,000 associates.

We actively share information, ideas and resources across our global operations through our network structure, guided subject matter teams and project team building.

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based federal and municipal clients, especially in water infrastructure, flood protection and solid waste.

GSG also leads our support for development agencies worldwide, especially in the United States, the United Kingdom and Australia.

GSG provides consulting and engineering services for a broad range of water, environment and sustainable infrastructure-related needs primarily for U.S.

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GSG provides our clients with sustainable solutions that optimize their water management and environmental programs to address regulatory requirements, improve operational efficiencies and manage assets.

Our services advance resiliency through the "greening" of infrastructure, design of energy efficiency and resource conservation programs, innovation in the capture and sequestration of carbon, development of disaster preparedness and response plans and improvement in water and land resource management practices.

Our services advance the resiliency of infrastructure, including design of energy efficiency and resource conservation programs, development of disaster preparedness and response plans and improvement in water and land resource management practices.

We provide energy management consulting, and greenhouse gas ("GHG") inventory assessment, certification, reduction and management services.

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providing design, project management and maintenance services to manage solid and hazardous waste;

as well as innovative renewable energy projects such as solar

energy-generating landfill caps;

as well as innovative renewable energy projects such as solar energy-generating landfill caps;

and providing full-service solutions for gas-to-energy facilities to efficiently use landfill methane gas.

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We provide technical support for the Federal Aviation Administration to optimize the U.S.

airspace system and support related aviation systems integration for the U.S.

airspace system and support for related aviation systems integration for the U.S.

and other countries' metropolitan airports.

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and providing systems analysis and information management.

We support governments in implementing international development programs for developing nations to help them address numerous challenges, including access to potable water, essential energy needs, economic development and climate adaptation.

Our international development services include supporting donor agencies to develop safe and reliable water supplies and sanitation services, support the eradication of poverty, improve livelihoods, promote democracy and increase economic growth.

Our programs span planning, designing, implementing, researching and monitoring projects and leverage advanced technology and AI-enabled analytics to collect, interpret and provide solutions for our clients.

Key areas of focus include agriculture and rural development, governance and institutional development, natural resources and the environment, energy and power, infrastructure, economic growth, rule of law and justice systems, land tenure and property rights and training and consulting for public-private partnerships.

Our projects also include building capacity and strengthening institutions in areas such as global health, energy sector reform, utility management, education, food security and local governance.

Commercial/International Services Group

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commercial clients, and international clients inclusive of the commercial and government sectors.

CIG supports commercial clients worldwide in renewable energy, industrial, high-performance buildings and aerospace markets.

CIG supports commercial clients worldwide in energy, industrial, high-performance buildings and aerospace markets.

CIG also provides sustainable infrastructure and related environmental, engineering and project management services to commercial and local government clients across Canada, in Asia Pacific (primarily Australia and New Zealand), Europe, the United Kingdom, and South America (primarily Brazil).

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CIG provides planning, architectural and high-performance building engineering services for commercial and government facilities.

We provide high-end design of sustainable energy, water and GHG decarbonization solutions including civil, electrical, mechanical, structural and hydraulic engineering for buildings, campuses and surrounding developments.

We provide high-end design of resilient energy, water and GHG decarbonization solutions including civil, electrical, mechanical, structural and hydraulic engineering for buildings, campuses and surrounding developments.

We provide high-end services in addressing indoor health and associated assessment, consulting and retrofits of buildings to address indoor air quality and safety.

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CIG's international services, especially in Canada, Europe, the United Kingdom, and Asia Pacific, include high-end analytical, engineering, architecture, geotechnical, project management and advisory services for infrastructure projects, including early project planning, rail and roadway monitoring and asset management services, collection of condition data, optimization of upgrades and long-term planning for expansion;

multi-modal design services for commuter railway stations,

airport expansions, bridges and major highways and ports and harbors;

and designing resilient solutions to repair, replace and upgrade older transportation infrastructure.

planning and design services for airport facilities, bridges and ports and harbors;

and designing resilient solutions to modernize infrastructure.

CIG provides infrastructure design services in extreme and remote areas by using specialized techniques that are adapted to local resources, while minimizing environmental impacts, and considering potential climate change impacts.

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For utilities and governmental regulatory agencies, our services include policy and regulatory development, utility management, performance improvement and asset management and evaluation.

For developers and owners of renewable energy resources such as solar grid and off-grid, on-shore and off-shore wind, biogas and biomass, tidal, hydropower, conventional power generation facilities, micro-grid and battery or alternative storage facilities, as well as transmission and distribution assets, our services include environmental, electrical, mechanical and civil engineering, procurement, operations and maintenance and regulatory support for all project phases.

transmission and distribution assets, our services include environmental, electrical, mechanical and civil engineering, procurement, and regulatory support for all project phases.

CIG supports industrial clients globally.

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Project Examples

Project examples are provided on our company website located at tetratech.com, including expert interviews, in-depth articles and project profiles that demonstrate our services acros s water, environment, sustainable infrastructure, renewable energy and international development.

We provide services to a diverse base of U.S.

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(2) Includes revenue generated from non-U.S.

clients, primarily in th e United Kingdom, Australia and Canada.

clients, primarily in Australia, Canada and th e United Kingdom.

fe deral government agencies are significant clients.

Agency for International Development accounted for 13.0%, 12.2% and 11.0% of our revenue in fiscal 2024, 2023 and 2022, respectively.

The United States Agency for International Development ("USAID") accounted for 10.6%, 13.0% and 12.2% of our revenue in fiscal 2025, 2024 and 2023, respectively.

The Department of Defense ("DoD") accounted for 11.6%, 8.5% and 8.9% of our revenue in fiscal 2025, 2024 and 2023, respectively.

We typically support multiple programs within a single U.S.

fede ral government agency, both domestically and internationally.

federal government agency, both domestically and internationally.

We also assist U.S.

state and local government clients in various jurisdictions across the United States.

Our international clients are primarily focused in Canada, Australia, Europe and the United Kingdom, and consist of a relatively equal sized mix of government and commercial clients.

commercial clients include companies in the chemical, energy, pharmaceutical, retail, aerospace and automotive industrie s.

Our international clients are primarily focused in Australia, Canada, Europe and the United Kingdom, and consist of a relatively equal sized mix of government and commercial clients.

commercial clients include companies in the chemical, energy, technology, retail, aerospace and automotive industries.

No single client, except for the U.S.

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Profitability on these contracts is driven by billable headcount and cost control.

Many of our time-and-materials contracts are subject to maximum contract values and, accordingly, revenue related to these contracts is recognized as if these contracts were fixed-price contracts.

Many of our time-and-materials contracts are subject to maximum contract values and,

accordingly, revenue related to these contracts is recognized as if these contracts were fixed-price contracts.

Under our cost-plus contracts, some of which are subject to a contract ceiling amount, we are reimbursed for allowable costs and fees, which may be fixed or performance-based.

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We maintain centralized business development resources to develop our corporate branding and marketing materials, support proposal preparation and planning, conduct market research and manage promotional and professional activities, including appearances at trade shows, advertising and public relations.

We have established company-wide growth initiatives that reinforce internal coordination, track the development of new programs, identify and coordinate collective resources for major bids and bring together high-end interdisciplinary teams that provide innovative solutions for major pursuits.

that provide innovative solutions for major pursuits.

Our growth initiatives provide a forum for cross-sector collaboration, access to technical solutions and the development of interdisciplinary solutions.

We continuously identify new markets that are consistent with our strategic plan and service offerings, and we leverage our full-service capabilities and internal coordination structure to develop and implement strategies to research, anticipate and position us for future procurements and emerging programs.

Our Tetra Tech Delta program facilitates access and exchange of technology solutions and AI-enabled software solutions across our company, through the use of internal training, inventories and facilitated virtual networking events.

Our Tetra Tech Delta program facilitates access and exchange of technology solutions and AI-enabled software solutions across our company, through the use of internal training, communities of practice, and facilitated virtual networking events.

Business development activities are implemented by our technical and professional management staff throughout Tetra Tech with the support of company-wide resources and expertise.

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For more than 50 years, we have leveraged cutting-edge expertise and the latest technology to deliver more sustainable solutions to clients and continually improve the way we do business.

Through our Sustainability Program, we monitor environmental, social and governance ("ESG") metrics, including human capital elements.

We continue to enhance the sustainability of our daily practices, reduce our GHG emissions, and provide an exceptional working environment for our employees across our global operations.

As a signatory of the United Nations ("UN") Global Compact on human rights, labor, environment and anti-corruption, we embrace the UN Global Compact's Ten Principles as part of the strategy, culture and daily operations of our company.

We actively engage with our stakeholders, internally and externally, to encourage input on the materiality of various ESG issues to Tetra Tech and have incorporated input into our double materiality analysis and sustainability program.

annual sustainability reporting and key metrics are aligned with the priorities we have set on ethics, human capital, professional development, and health & safety.

We report on human capital metrics, including gender balance, racial and ethnic diversity in our workforce, employee engagement and professional development.

Through our Sustainability Program, we continue to enhance the sustainability of our daily practices, reduce our GHG emissions, and provide an exceptional working environment for our employees across our global operations.

As a signatory of the United Nations ("UN") Global Compact on human rights, labor, environment and anti-corruption, we embrace the UN Global Compact's Ten Principles.

We actively engage with our stakeholders, internally and externally, to encourage input on the materiality of various sustainability issues to Tetra Tech and have incorporated input into our double materiality analysis and sustainability program.

Our annual sustainability reporting and key metrics are aligned with the priorities we have set on ethics, professional development, and health & safety.

We have supplier programs that integrate and emphasize sustainability in the procurement of goods and services and subcontracting for our projects.

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In 2021, we expanded our reporting and set new goals for scope 1, 2, and 3 emissions.

Based on input from stakeholders and in recognition of the importance of the project work we perform each year, in 2021 we also initiated our Billion People Challenge, with the overarching goal to improve the lives of one billion people by 2030.

The Billion People Challenge progress is evaluated each year based on our annual project impact analysis in five categories that are closely aligned with the Global Reporting Initiative standards and the UN Sustainable Development Goals.

Our Sustainability Program is led by our Chief Sustainability Officer, who has been appointed by our Board of Directors and is supported by corporate and operations representatives through our Sustainability Council.

We continuously review sustainability-related policies and practices, integrate input from stakeholders, and assess the results of our efforts in order to make future improvements.

Tetra Tech's Board of Directors reviews and approves the Sustainability Program and evaluates our progress in achieving the goals and objectives outlined in our plan.

As part of our membership in the UN Global Compact, we annually report on the Communication on Progress using Tetra Tech's Sustainability Report .

Tetra Tech's Board of Directors reviews and approves the Sustainability Program and evaluates our progress as outlined in Tetra Tech's annual Sustainability Report .

Acquisitions and Divestitures

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We evaluate an acquisition opportunity based on its ability to strengthen our leadership in the markets we serve, the technologies and solutions they provide and the additional new geographies and clients they bring.

Also, during our evaluation, we examine an acquisition's ability to drive organic growth, its accretive effect on long-term earnings and its ability to generate return on investment.

Also, during our evaluation, we examine an acquisition's ability to drive organic growth, its accretive effect on long-term earnings and its ability to generate return on

Generally, we proceed with an acquisition if we believe that it will strategically expand our service offerings, improve our long-term financial performance and increase shareholder returns.

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All acquisitions require the approval of our Board of Directors.

In the second quarter of fiscal 2024, we acquired LS Technologies ("LST"), an innovative U.S.

In the second quarter of fiscal 2025, we acquired Carron + Walsh ("CAW"), based in the Republic of Ireland.

CAW delivers project and cost management solutions for large-scale commercial, life science, residential and infrastructure programs across Europe.

In the third quarter of fiscal 2025, we acquired SAGE Group Holdings ("SAGE"), an Australian consulting firm that provides innovative technology and high-quality automation services that optimize operational efficiency and drive digital transformation for commercial and government clients across the municipal water, energy, transportation, defense and manufacturing sectors.

Both CAW and SAGE are included in our CIG segment.

In fiscal 2024, we acquired LS Technologies ("LST"), an innovative U.S.

federal enterprise technology services and management consulting firm based in Fairfax, Virginia.

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government clients.

In the third quarter of fiscal 2024, we also acquired Convergence Controls & Engineering ("CCE"), an industry leader in process automation and systems integration solutions.

In fiscal 2024, we also acquired Convergence Controls & Engineering ("CCE"), an industry leader in process automation and systems integration solutions.

CCE’s expertise includes customized digital controls and software solutions, advanced data analytics, cloud data integration and cybersecurity applications.

Both LST and CCE are included in our GSG segment.

In the second quarter of fiscal 2023, we completed the acquisition of RPS Group plc ("RPS"), a publicly traded company on the London Stock Exchange in an all-cash transaction totaling $784 million.

In fiscal 2023, we completed the acquisition of RPS Group plc ("RPS"), a publicly traded company on the London Stock Exchange in an all-cash transaction totaling $784 million.

We funded the RPS acquisition with debt, net of $109 million in proceeds from a foreign exchange forward contract that we entered into at the same time we made the formal offer to acquire RPS on September 23, 2022.

RPS employs approximately 5,000 associates in the United Kingdom, Europe, Asia Pacific and North America, delivering high-end solutions, especially in energy transformation, water and program management for government and commercial clients.

RPS operates in the United Kingdom, Europe, Asia Pacific and North America, delivering high-end solutions, especially in energy transformation, water and program management for government and commercial clients.

Substantially all of RPS is included in our CIG segment.

In the second quarter of fiscal 2023, we also acquired Amyx, Inc.

In fiscal 2023, we also acquired Amyx, Inc.

(“Amyx”), an enterprise technology services, cybersecurity and management consulting firm based in Reston, Virginia.

With over 500 employees, Amyx provides application modernization, cybersecurity, systems engineering, financial management and program management support on over 30 U.S.

Amyx provides application modernization, cybersecurity, systems engineering, financial management and program management support on over 30 U.S.

federal government programs.

Amyx is included in our GSG segment.

For detailed information regarding acquisitions, see Note 5, "Acquisitions" of the "Notes to Consolidated Financial Statements" included in Item 8.

Divestitures.

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Accordingly, from time to time, we may divest or wind-down certain non-core businesses and reallocate our resources to businesses that better align with our long-term strategic direction.

the fourth quarter of fiscal 2024, we agreed to divest a financially immaterial subsidiary in South America and a line of business in Australia.

We did not divest any businesses in fiscal 2023.

In fiscal 2025, we divested a subsidiary in South America and a line of business in Australia, both of which were immaterial.

We did not divest any businesses in fiscal 2023 and 2024.

For detailed information regarding acquisitions, see Note 5, "Acquisitions and Divestitures" of the "Notes to Consolidated Financial Statements" included in Item 8.

The market for our services is generally competitive.

We often compete with many other firms ranging from small regional firms to large international firms.

We perform a broad spectrum of consulting, engineering and technical services across the water, environment, sustainable infrastructure, renewable energy and international development markets.

We perform a broad spectrum of consulting, engineering and technical services across the water, environment and sustainable infrastructure markets.

Our competition varies and is a function of the business areas in which, and the client sectors for which, we perform our services.

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CDM Smith Inc.;

Chemonics International, Inc.;

Exponent, Inc.;

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We include in our backlog only those contracts for which funding has been provided and work authorization has been received.

We estimate that approximately 70% of our backlog at the end of fiscal 2024 will be recognized as revenue in fiscal 2025, as work is being performed.

We estimate that approximately 70% of our backlog at the end of fiscal 2025 will be recognized as revenue in fiscal

2026, as work is being performed.

However, we cannot guarantee that the revenue projected in our backlog will be realized or, if realized, will result in profits.

In addition, project cancellations or scope adjustments may occur with respect to contracts reflected in our backlog.

In addition, proj ect cancellations or scope adjustments may occur with respect to contracts reflected in our backlog.

For example, certain of our contracts with the U.S.

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Accordingly, our backlog as of any particular date is an uncertain indicator of our future earnings.

Our backlog at fiscal 2024 year-end was $5.4 billion, an increase of $586 million, or 12.2%, compared to fiscal 2023 year-end.

Of this amount, GSG and CIG reported $3.2 billion and $2.2 billion of backlog, respectively, at fiscal 2024 year-end.

Our backlog at fiscal 2025 year-end was $4.1 billion.

GSG and CIG reported $1.98 billion and $2.22 billion of backlog, respectively, at fiscal 2025 year-end.

We engage in various service activities that are subject to government oversight, including environmental laws and regulations, general government procurement laws and regulations and other regulations and requirements imposed by the specific government agencies with which we conduct business.

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We assess the impact of climate risk and opportunity on our operations and business periodically, with the oversight of our Board of Directors.

Climate risk is a consideration in business continuity planning and security in regions that may experience climate-related disruptions due to extreme weather, fires, or flooding.

Climate risk is a consideration in business continuity planning and security in regions that may

experience climate-related disruptions due to extreme weather, fires or flooding.

Climate-related impacts may also create increased demand for our services for response and longer-term recovery needs.

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As a professional services company, our workforce is highly mobile, able to work remotely, and can in most cases quickly adapt to changes in local conditions.

We have business continuity planning and processes in place to address any acute impact to locally affected operations and have the ability to rapidly move to remote and flexible working arrangements while restoring or relocating affected operations.

We have business continuity planning and processes in place to address any acute impact to locally affected operations can rapidly move to remote and flexible working arrangements while restoring or relocating affected operations.

We maintain a strong information technology infrastructure to facilitate remote working and provide virtual access to systems.

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We provide post-disaster response services and may have additional demand for our expertise if there is an increase in the frequency of climate-related events.

We are able to mobilize rapidly to deploy additional staff and resources to affected areas.

We can mobilize rapidly to deploy additional staff and resources to affected areas.

Furthermore, our business includes providing a wide range of water, environment and sustainable infrastructure services, many of which are increasingly in demand to address the longer-term impacts associated with drought, water scarcity, heat, flooding and fire risk.

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Our historic levels of insurance coverage and reserves have been adequate.

partially or completely uninsured claims, if successful and of significant magnitude, could have a material adverse effect on our business.

However, partially or completely uninsured claims, if successful and of significant magnitude, could have a material adverse effect on our business.

Human Capital Management

At fiscal 2024 year-end, we had approximately 30,000 staff worldwide.

A large percentage of our employees have technical and professional backgrounds and undergraduate and/or advanced degrees, including the e mployees of recently acquired companies.

Our professional staff includes, but is not limited to, analysts, archaeologists, architects, biologists, chemical engineers, chemists, civil engineers, data scientists, computer scientists, digital engineers, economists, electrical engineers, environmental engineers, environmental scientists, geologists, hydrogeologists, mechanical engineers, software engineers, statisticians, oceanographers, project managers and toxicologists.

At fiscal 2025 year-end, we had more than 25,000 staff worldwide.

A large percentage of our employees have technical and professional backgrounds and undergraduate and/or advanced degrees, including the employees of recently acquired companies.

Our professional staff includes, but is not limited to, analysts, archaeol ogists, architects, biologists, chemical engineers, chemists, civil engineers, data scientists, computer scientists, digital engineers, economists, electrical engineers, environmental engineers, environmental scientists, geologists, hydrogeologists, mechanical engineers, software engineers, statisticians, oceanographers, project managers and toxicologists.

We consider the current relationships with our employees to be favorable.

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Our Code of Business Ethics and Conduct outlines the general ethical principles that help us make the right decisions when conducting business worldwide.

To support our employees, we provide a variety of resources and trainings and offer multiple avenues to raise questions or concerns - to help ensure long-term success for our employees, company, clients, and shareholders.

Diversity, Equity, Inclusion and Accessibility.

Tetra Tech brings together engineers and technical specialists from all backgrounds to solve our clients' most challenging problems.

Our Diversity, Equity, Inclusion and Accessibility ("DEIA") Policy guides the Board of Directors, management, associates, subcontractors and partners in developing an inclusive culture.

Our DEIA Council monitors Tetra Tech's diversity, equity, inclusion and accessibility practices and makes recommendations to the Board of Directors and Chief Executive Officer for any changes or improvements to our program.

Tetra Tech values diversity, equity, inclusion and accessibility and undertakes various efforts throughout its operations to promote these initiatives.

Our current efforts are focused on these primary areas:

To support our employees, we provide a variety of resources and training and offer multiple avenues to raise questions or concerns - to help ensure long-term success for our employees, company, clients, and shareholders.

Equal Employment Opportunity.

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Education assistance is offered to financially support associates who seek to expand their knowledge and skill base.

As part of Tetra Tech's commitment to a culture of inclusion, our Employee Resource Group ("ERG") Program broadens and enhances company-wide interaction opportunities for our employees.

Tetra Tech's ERGs are open to all associates and involve activities for both employees whose background is the focus of the ERG and those who are supportive of the group (also known as allies).

These global networks build on and coordinate with the many local networks that are already active throughout our operations and include groups focused on the experiences of Black, Latino, Pan-Asian, Women, Veterans, Disabled and LGBTQIA+ employees and emerging professionals.

Professional Development.

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Name Age Position

66 Chairman, Chief Executive Officer and President

67 Chairman and Chief Executive Officer

Batrack joined our predecessor in 1980 and was named Chairman in January 2008.

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degree in Business Administration from the University of Washington.

Argus 64 President

Argus was appointed President in October 2025.

He served as Executive Vice President, Corporate Development from November 2024 to October 2025, and President, Commercial/International Services Group from October 2023 to October 2025.

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.

He is a chemical engineer with 40 years of experience, including over 30 years with us in operational leadership, program and project management and quality assurance for projects encompassing a broad spectrum of environmental, engineering, information technology and disaster management services.

Argus holds a B.S.

in Chemical Engineering from California State University, Long Beach.

61 Executive Vice President, Chief Financial Officer

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degree in Business Administration from Santa Clara University and is a Certified Public Accountant.

Name Age Position

Preston Hopson 49 Executive Vice President, Chief Legal and Human Capital Officer and Secretary

Hopson was appointed Executive Vice President, Chief Legal and Human Capital Officer in November 2024, having served as Senior Vice President, General Counsel and Secretary to the Board of Directors since January 2018.

He also serves as the Chief Ethics and Compliance Officer.

Previously, Mr.

Hopson served as Vice President, Assistant General Counsel and Assistant Corporate Secretary at AECOM.

Prior to this, he was a corporate and securities lawyer at O’Melveny & Myers LLP and also worked at the U.S.

Court of Appeals.

Hopson holds B.A.

degrees from Yale University.

Leslie Shoemaker

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Shoemaker joined us in 1991, and has served in various management capacities, including Tetra Tech President, Chief Strategist, business group president, and water resources project manager.

Her technical expertise is in the development models and data analytics that leverage emerging technologies to optimize the management of large-scale complex watersheds.

Her technical expertise is in development models and data analytics that leverage emerging technologies to optimize the management of large-scale complex watersheds.

Since the inception of our sustainability program in 2010, she has served as Chief Sustainability Officer leading the formation and evolution of the program.

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She was inducted into the United States' National Academy of Engineers in 2022.

Name Age Position

Argus 63 Executive Vice President, President of CIG

Argus is a chemical engineer with 39 years of experience, including over 30 years with us in operational leadership, program and project management and quality assurance for projects encompassing a broad spectrum of environmental, engineering, information technology and disaster management services.

Argus has also been responsible for managing multidisciplinary contracts and projects in support of the U.S.

federal government (i.e., U.S.

Navy, the U.S.

Army Corps of Engineers and the Environmental Protection Agency), state and municipal agencies and private clients nationwide.

The scope of his technical experience includes planning and directing environmental programs, developing data acquisition, management and analytics solutions, fund research and development support for innovative environmental technologies and waste treatment systems, municipal resiliency and sustainability programs.

Argus holds a B.S.

in Chemical Engineering from California State University, Long Beach.

Carter 58 Senior Vice President, Corporate Controller and Chief Accounting Officer

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in Business Administration from Miami University and is a Certified Public Accountant.

Preston Hopson 48 Executive Vice President, Chief Legal and Human Capital Officer

Hopson joined us as Senior Vice President, General Counsel and Secretary to the Board of Directors in January 2018, was appointed Executive Vice President, Chief Legal and Human Capital officer in November 2024.

He also serves as the Chief Ethics and Compliance Officer.

Previously, Mr.

Hopson served as Vice President, Assistant General Counsel and Assistant Corporate Secretary at AECOM.

Prior to this, he was a corporate and securities lawyer at O’Melveny & Myers LLP and also worked at the U.S.

Court of Appeals.

Hopson holds B.A.

degrees from Yale University.

Available Information

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Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.

What changed 10-K

Item 1. Business