Tetra Tech, Inc. (NASDAQ: TTEK), a global provider of high-end technical and engineering services, Leading with Science® in water, environment and sustainable infrastructure, today announced results for the fourth quarter and fiscal year ended September 27, 2026.

Fourth Quarter Results

Revenue and revenue, net of subcontractor costs (net revenue)1, in the fourth quarter totaled $1.34 billion and $1.15 billion, respectively. Net revenue increased 5% year-over-year excluding episodic disaster response. Operating income was $188 million and adjusted EBITDA1 was $194 million; adjusted EBITDA margin increased 90 basis points year-over-year. EPS was $0.51 and adjusted EPS1 was $0.49, up 9% year-over-year. Backlog was $4.67 billion at the end of the fourth quarter, up 13% year-over-year.

Recent Key Wins

  • $1.4 billion multiple-award blanket purchase agreement for enterprise logistics services for NASA

  • $145 million multiple-award contract for engineering and technical consulting services for U.S. Navy

  • $141 million single-award contract for water infrastructure assessment services for U.S. EPA

  • $85 million multiple-award contracts for environmental services for USACE Europe District

  • $63 million single-award contract for emergency preparedness and response services for U.S. EPA

  • $49 million multiple-award contract for geospatial and engineering services for NOAA

  • $14 million single-award contract for digital systems modernization for LA Metro

  • $12.7 million single-award contracts for technical services for Millennium Challenge Corporation

Executive Management Comments

Roger Argus, Chief Executive Officer, commented, “We completed fiscal year 2026 with a strong fourth quarter driven by our global commercial and government businesses. We continue to see increasing demand for our differentiated Leading with Science® technical services for water and environmental programs, including digital automation for associated facilities. Our resilient infrastructure design services are growing globally with new contracts for water supply, coastal infrastructure, and defense modernization. These key client programs drove our backlog up by more than $530 million, an increase of 13% from last year. This strong momentum in backlog gives us confidence in continued revenue growth and further margin expansion.”

Steve Burdick, Chief Financial Officer, stated, “In fiscal year 2026, we continued to increase our profit margins with 90 basis points of EBITDA margin expansion from fiscal year 2025. The strength of our balance sheet and consistent cash flow generation position us to continue to invest in organic growth and strategic acquisitions.”

Quarterly Dividend and Share Repurchase Program

On November 9, 2026, Tetra Tech’s Board of Directors approved a quarterly dividend in the amount of $0.072 per share, an 11% increase year-over-year, payable on December 11, 2026, to stockholders of record as of December 2, 2026. This is the 46th consecutive double-digit increase in the Company’s quarterly dividend. In the fourth quarter of fiscal year 2026, Tetra Tech repurchased $100 million of common stock. Additionally, as of September 27, 2026, the Company had $798 million remaining under its share repurchase program.

Fiscal Year Results

Revenue for fiscal year 2026 was $5.08 billion and net revenue was $4.35 billion. For fiscal year 2026, net revenue increased 7% compared to last year excluding USAID / DOS and episodic disaster response. Operating income was $619 million, adjusted EBITDA was $660 million with margin up 90 basis points compared to last year, and EPS was $1.69. Cash flows generated from operations were up 14% year-over-year.

Business Outlook

The following statements are based on current expectations. These statements are forward-looking, and the actual results could differ materially. These statements do not include the potential impact of transactions that may be completed or developments that become evident after the date of this release. The Business Outlook section should be read in conjunction with the information on forward-looking statements at the end of this release.

Tetra Tech expects EPS for the first quarter of fiscal year 2027 to range from $0.36 to $0.38 and net revenue2 to range from $1.04 billion to $1.08 billion. For fiscal year 2027, Tetra Tech expects EPS to range from $1.65 to $1.80, and net revenue to range from $4.425 billion to $4.625 billion.

Webcast

Investors will have the opportunity to access a live audio-visual webcast and supplemental financial information concerning the fourth quarter and fiscal year 2026 results through a link posted on the Company’s website at tetratech.com on November 12, 2026, at 8:00 a.m. (PT).

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1

Non-GAAP financial measures which the Company believes provide valuable perspectives on its business results. Refer to Regulation G Information for reconciliations to the comparable GAAP metrics.

2

Reconciliation of the net revenue guidance to the most directly comparable GAAP measure is not available without unreasonable efforts because the Company cannot predict the magnitude and timing of all the components required to provide such reconciliation with sufficient precision.

About Tetra Tech

Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide. With more than 25,000 employees working together, Tetra Tech provides clear solutions to complex problems by Leading with Science® to address the entire water cycle, protect and restore the environment, and design sustainable and resilient infrastructure. For more information about Tetra Tech, please visit tetratech.com or follow us on LinkedIn and Facebook.

Forward-Looking Statements

This release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The use of words such as “anticipate,” “expect,” “could,” “may,” “intend,” “plan” and “believe,” among others, generally identify forward-looking statements. These forward-looking statements are based on current expectations and beliefs of Tetra Tech’s management and currently available operating, financial, economic and other information, and are subject to a number of risks and uncertainties. Readers are cautioned that these forward-looking statements are only predictions and may differ materially from actual future events or results. A variety of factors, many of which are beyond our control, could cause actual future results or events to differ materially from those projected in the forward-looking statements in this release, including but not limited to: continuing worldwide political and economic uncertainties; the U.S. Administration’s potential changes to fiscal policies; the cyclicality in demand for our overall services; the fluctuation in demand for oil and gas, and mining services; risks related to international operations; concentration of revenues from U.S. government agencies and potential funding disruptions by these agencies; dependence on winning or renewing U.S. government contracts; the delay or unavailability of public funding on U.S. government contracts; the U.S. government’s right to modify, delay, curtail or terminate contracts at its convenience; compliance with government procurement laws and regulations; the impact of global pandemics; credit risks associated with certain clients in certain geographic areas or industries; acquisition strategy and integration risks; goodwill or other intangible asset impairment; the failure to comply with worldwide anti-bribery laws; the failure to comply with domestic and international export laws; the failure to properly manage projects; the loss of key personnel or the inability to attract and retain qualified personnel; the ability of our employees to obtain government granted eligibility; the use of estimates and assumptions in the preparation of financial statements; the ability to maintain adequate workforce utilization; the use of the percentage-of-completion method of accounting; the inability to accurately estimate and control contract costs; the failure to adequately recover on our claims for additional contract costs; the failure to win or renew contracts with private and public sector clients; growth strategy management; backlog cancellation and adjustments; risks relating to cyber security breaches; the failure of partners to perform on joint projects; the failure of subcontractors to satisfy their obligations; requirements to pay liquidated damages based on contract performance; the adoption of new legal requirements; changes in resource management, environmental or infrastructure industry laws, regulations or programs; changes in bank and capital markets and the access to capital; credit agreement covenants; industry competition; liability related to legal proceedings, investigations, and disputes; the availability of third-party insurance coverage; the ability to obtain adequate bonding; employee, agent, or partner misconduct; employee risks related to international travel; safety programs; conflict of interest issues; liabilities relating to reports and opinions; liabilities relating to environmental laws and regulations; force majeure events; protection of intellectual property rights; stock price volatility; the ability to impede a business combination based on Delaware law and charter documents; and other risks and uncertainties as may be described in Tetra Tech’s periodic filings with the Securities and Exchange Commission, including those described in the “Risk Factors” section of Tetra Tech’s Annual Report on Form 10-K for the fiscal year ended September 28, 2025. Readers should not place undue reliance on forward-looking statements since such information speaks only as of the date of this release. Tetra Tech does not intend to update forward-looking statements and expressly disclaims any obligation to do so.

Non-GAAP Financial Measures

To supplement the financial results presented in accordance with generally accepted accounting principles in the United States (“GAAP”), we present certain non-GAAP financial measures within the meaning of Regulation G under the Securities Exchange Act of 1934, as amended. We provide these non-GAAP financial measures because we believe they provide a valuable perspective on our financial results. However, non-GAAP measures have limitations as analytical tools and should not be considered in isolation and are not in accordance with, or a substitute for, GAAP measures. In addition, other companies may define non-GAAP measures differently which limits the ability of investors to compare non-GAAP measures of Tetra Tech to those used by our peer companies. A reconciliation of these non-GAAP financial measures to the most directly comparable GAAP financial measures is set forth in this release.

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