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Tetra Tech Inc
3475 E Foothill Blvd
Phone: (302) 658-7581p:302 658-7581 PASADENA, CA  91107  United States Ticker: TTEKTTEK
Business Summary
Tetra Tech, Inc. is a provider of consulting and engineering services, which is focused on water, environment, and sustainable infrastructure. The Company provides solutions to public and private clients by Leading with Science. Its segments include Government Services Group (GSG) and Commercial/International Services Group (CIG). Its GSG segment provides high-end consulting and engineering services primarily to the United States government clients (federal, state, and local). Its CIG segment provides consulting and engineering services to the United States commercial clients, and international clients inclusive of the commercial and government sectors. 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 Brazil.
(Source: 6-K)

Scores and Ratings
FRISK®
Score		 Z''
Score		 PAYCE®
Score		 DBT
Index		 Moody's
Rating		 Fitch
Rating		 DBRS
Rating
YesYes-Yes---

Financials, News and Filings
Latest
Statement		 Last
Audit
News		 SEC
Filings		 Bankruptcy
Filings		 Suit &
Judgment
Filings		 Tax
Lien
Filings
12/28/20259/28/2025YesYes--Yes

Industries
SIC Code Description
8711 Engineering services
8999 Services, not elsewhere classified
9511 Air and water resource and solid waste management
1629 Heavy construction, not elsewhere classified
1623 Water, sewer, pipeline, and communications and power line construction

Officers and Directors

Title
Name
Age		 Title
Date		 Start
Date
Executive Chairman of the Board Dan L.Batrack 67 2/19/2026 11/1/2002
Chairman Emeritus Li SanHwang 88 3/9/2006 3/9/2006
President, Chief Executive Officer, Director Roger R.Argus 64 2/19/2026 11/6/2017
9 additional Officers and Directors records available in full report.

Subsidiaries
Business Name Address City State/Province Country
TETRA TECH GROUP LIMITED 3 SOVEREIGN SQUARE SOVEREIGN STREET UK
TETRA TECH LIMITED 3 SOVEREIGN SQUARE SOVEREIGN STREET UK
RPS Group plc 20 Western Avenue ABINGDON United Kingdom
24 additional Subsidiary records available in full report.

Business Names
Business Name
Advanced Management Technology, Inc.
America's Schoolhouse Consulting Services, Inc.
Amyx Inc.
45 additional Business Names available in full report.

General Information
Number of Employees: 25,000 (As of 12/28/2025)
Outstanding Shares: 260,807,561 (As of 1/19/2026)
Shareholders: 1,020
Stock Exchange: NASD
Federal Tax Id: 954148514
Fax Number: (302) 655-5049
Email Address: IR@tetratech.com


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Sunday, April 12, 2026