| BRIDGENET INTERNATIONAL INC.Location not reported, FL · Active | Location not reported, FL | Corporation | May 8, 2023 | Active |
| DIGITAL SYSTEMS X, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Sep 30, 2025 | Active |
| TETRA TECH BAS, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | May 12, 2016 | Active |
| TETRA TECH EXECUTIVE SERVICES, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Oct 22, 2007 | Active |
| ADVANCED MANAGEMENT TECHNOLOGY, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Mar 15, 2004 | Active |
| TETRA TECH EC, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Feb 19, 2003 | Active |
| CORNERSTONE ENVIRONMENTAL GROUP, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Oct 10, 2006 | Active |
| WILLIAMS, HATFIELD & STONER, INC.Fort Lauderdale, FL · Inactive | Fort Lauderdale, FL | Corporation | Sep 8, 1958 | Inactive |
| LC OF ILLINOIS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jan 11, 2000 | Inactive |
| TETRA TECH/KCM, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Apr 4, 2000 | Inactive |
| TETRA TECH MM, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jun 2, 2000 | Inactive |
| MAXIM TECHNOLOGIES OF TEXAS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jul 21, 2000 | Inactive |
| TETRA TECH EMC, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Nov 27, 2000 | Inactive |
| TETRA TECH RMC, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jan 24, 2001 | Inactive |
| SCIENCES INTERNATIONAL, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Oct 4, 2001 | Inactive |
| TETRA TECH ES, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Nov 10, 2004 | Inactive |
| INDUS CORPORATIONLocation not reported, FL · Inactive | Location not reported, FL | Corporation | Jan 26, 2005 | Inactive |
| WESTERN UTILITY CONTRACTORS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Oct 7, 2005 | Inactive |
| TETRA TECH CONSTRUCTION, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jul 30, 2007 | Inactive |
| THE THOMAS GROUP OF COMPANIES, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jun 12, 2008 | Inactive |
| TETRA TECH CONSTRUCTION SERVICES, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Sep 18, 2008 | Inactive |
| ROONEY ENGINEERING, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Oct 14, 2009 | Active |
| CLANCY ENVIRONMENTAL CONSULTANTS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Mar 8, 2010 | Inactive |
| TETRA TECH TESORO, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jun 8, 2010 | Inactive |
| TETRA TECH MA, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | May 17, 2012 | Inactive |
| ARD OF VERMONT, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Apr 3, 2017 | Active |
| RPS GROUP, INCORPORATED (FL)Location not reported, FL · Active | Location not reported, FL | Corporation | Nov 1, 2018 | Active |
| EGLOBAL TECH INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Jul 6, 2020 | Active |
| AMYX, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Nov 14, 2022 | Active |
| THE INTEGRATION GROUP OF AMERICAS, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | May 1, 2024 | Active |
| TETRA TECH EM INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Nov 12, 1993 | Inactive |
| MCNAMEE,PORTER & SEELEY, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Apr 28, 1997 | Inactive |
| TETRA TECH NUS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jan 13, 1998 | Inactive |
| WHALEN & COMPANY, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Feb 12, 1999 | Inactive |
| TETRA TECH TECHNICAL SERVICES, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Apr 16, 1999 | Active |
| COSENTINI ASSOCIATES, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Dec 15, 1999 | Active |
| ARDAMAN & ASSOCIATES, INC.Orlando, FL · Active | Orlando, FL | Corporation | Jan 2, 1990 | Active |
| HARTMAN & ASSOCIATES, INC.Orlando, FL · Inactive | Orlando, FL | Corporation | Jun 20, 1990 | Inactive |
| AMERICAN ENVIRONMENTAL GROUP, LTD., LLCLocation not reported, FL · Inactive | Location not reported, FL | LLC | Apr 25, 2002 | Inactive |
| PRO-TELLIGENT LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Mar 24, 2010 | Active |
| THE KAIZEN COMPANY LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Mar 23, 2022 | Active |
| HALVIK LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Feb 2, 2026 | Active |
| LS TECHNOLOGIES, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Sep 1, 2026 | Active |
| HAI AQUISITION CORPORATIONLocation not reported, FL · Inactive | Location not reported, FL | Corporation | Mar 6, 2002 | Inactive |
| AAI ACQUISITION CORPORATIONLocation not reported, FL · Inactive | Location not reported, FL | Corporation | Jun 14, 2002 | Inactive |
| TETRA TECH, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Apr 28, 1988 | Active |
| GEOTRANS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jan 8, 1990 | Inactive |