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Tetra Tech, Inc. was founded in 1966 to provide engineering services related to waterways, harbors, and coastal areas.
Doctor Li-San Hwang, who joined the company in 1967, led the new independent Tetra Tech.
During the company's early years its income grew steadily, with annual revenues topping $5 million by 1973.
By 1976 the combined companies' annual sales had grown to $18 million.
In January 1977 Tetra Tech offered 500,000 shares of common stock on the over-the-counter market, which in May was listed on the American Stock Exchange.
In 1982 Honeywell, Inc. purchased Tetra Tech's United States operations and another group acquired Tetra Tech International.
The first of these came in 1988 when GeoTrans, Inc. was purchased.
In 1988 Honeywell sold Tetra Tech's engineering division to a group of company employees.
Tetra Tech’s history in Chile begins with the 100% acquisition of its predecessor, Metálica Consultores S.A., a company officially created in February 1991 with professional teams excelling in mining planning engineering.
Since going public in 1991 the company had seen annual revenues grow by more than sevenfold, and its backlog of orders was also at an all-time high.
In 1991 Tetra Tech issued 1.4 million shares of stock on the NASDAQ exchange.
In December 1993 the company purchased Simons, Li & Associates, Inc., a California-based water resources engineering firm that specialized in urban drainage, flood control, bridge waterway design, and other types of civil engineering.
The year 1994 saw the acquisition of Simon Hydro-Search Inc., a Denver company specializing in water resource management.
Gross revenues totaled $96.5 million by 1994.
1995: Acquisition of EMI
The year 1995 was another record year for Tetra Tech, with revenues bolstered by both newly signed contracts and the income of new subsidiaries.
In early 1996 Tetra Tech announced that its various companies were in the process of signing contracts with federal and state government agencies worth nearly $800 million.
Another wireless firm, CommSite Development Corporation, was purchased in July 1997.
Acquisitions continued to come fast and furious in 1997, as did the signing of major contracts.
Late in 1997 Halliburton NUS Corp. joined the Tetra Tech family and was renamed Tetra Tech NUS. NUS provided environmental and waste management services to private industry and government agencies, and was noted for its ability to successfully manage difficult projects.
Annual sales for 1998 reached $382.9 million, more than triple the figure of just three years earlier.
The company purchased three new businesses in 1998: CDC Engineering; McNamee, Porter & Seeley, Inc.; and Sentrex Cen-Comm Communications Systems, Inc.
In February 1999 Tetra Tech purchased environmental consulting and engineering firm McCulley, Frick & Gilman.
In 2003 management decided to seek quality certification for Metálica’s engineering process under ISO 9001 standards to anticipate growing market demands, and simultaneously, differentiate the company from its competitors.
Beginning in 2011, Metálica Consultores was fully acquired by Tetra Tech, Inc., a global consulting and engineering firm with 20,000 employees, including scientists and engineers in 450 offices around the world.
Tetra Tech also celebrated 25 years as a publicly traded company on the NASDAQ Stock Market Exchange in December 2016.
In 2016 Tetra Tech commemorated its 50th anniversary.
Beginning in 2017 Tetra Tech expanded its sustainable infrastructure design practice.
In January 2018 Tetra Tech acquired an aviation technology solutions firm that expands Tetra Tech's aerospace data analytics, environmental and acoustic consulting, and 3-dimensional airspace visualization capabilities for federal and commercial aviation customers.
In July 2019 Tetra Tech acquired UK-based engineering firm WYG, expanding Tetra Tech’s geographic presence and advancing Tetra Tech’s strategy to be a premier global high-end consulting, engineering, and program management firm.
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| Company name | Founded date | Revenue | Employee size | Job openings |
|---|---|---|---|---|
| AECOM | 1990 | $16.1B | 51,000 | 3,430 |
| Cosentini Associates | - | $25.0M | 313 | - |
| Glumac | 1971 | $21.4M | 450 | 1 |
| CDM Smith | 1947 | $1.3B | 5,000 | 14,883 |
| Stantec | 1954 | $4.3B | 22,000 | 4,699 |
| Langan | 1970 | $300.0M | 550 | 651 |
| GAI Consultants | 1958 | $135.8M | 867 | 169 |
| Parsons | 1944 | $6.8B | 17,000 | 1,523 |
| Dewberry | 1956 | $462.6M | 7,500 | 720 |
| Barr Engineering Co. | 1966 | $140.0M | 798 | 43 |
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Tetra Tech may also be known as or be related to Tetra Tech, Inc., Tetra Tech Inc, Tetra Tech and tetra technologies.