| 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 EMC, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Jul 2, 2021 | 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 |
| TETRA TECH EMC, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Nov 27, 2000 | 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 |
| TETRA TECH CONSTRUCTION, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jul 30, 2007 | Inactive |
| 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 |
| BLUEWATER FEDERAL SOLUTIONS, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Mar 22, 2018 | 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 |
| MANAGEMENT SYSTEMS INTERNATIONAL, INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Jan 14, 2021 | Active |
| 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 |
| 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 |
| LS TECHNOLOGIES, LLCLocation not reported, FL · Active | Location not reported, FL | LLC | Sep 1, 2026 | Active |
| 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 |