| The Robert B Balter Co. | Owings Mills | MD | $0 |
| The Roderick Group, LLC | Chicago | IL | Subcontractor |
| The Rovisys Company | Aurora | OH | Subcontractor |
| The Sigma Group Inc. | Milwaukee | WI | $0 |
| The Superior Group, Inc. | Anchorage | AK | Subcontractor |
| The Systems Security Engineering Group LLC | Albuquerque | NM | Subcontractor |
| The Thrasher Group Inc. | Bridgeport | WV | $0 |
| The Traffic Group Inc. | Nottingham | MD | Subcontractor |
| The Tridyn Group LLC | Marlton | NJ | Subcontractor |
| The Vigil-b & P Group LLC | Santa Fe | NM | Subcontractor |
| The Wells Resource, LLC | Ashland | NE | $0 |
| The Zanfer Group, LLC | Silver Spring | MD | $0 |
| Thiele Geotech Inc. | Omaha | NE | Subcontractor |
| Thinkpath Technical LLC | Miamisburg | OH | Subcontractor |
| Th Metrology LLC | Vienna | VA | $0 |
| Thomas & Beers, LLC | Ventura | CA | Subcontractor |
| Thomas Engineering Group, LLC | Oak Park | IL | $0 |
| Thomas G Schneider | Topanga | CA | $0 |
| Thompson & Litton, Inc. | Radford | VA | Subcontractor |
| Thornberry Consulting LLC | Aurora | CO | $0 |
| Thorne & Associates, P.a. | Idaho Falls | ID | Subcontractor |
| Thornton Tomasetti Inc.Albuquerque, NM · UEI FJPWTM9PTR33 | Albuquerque | NM | Subcontractor |
| Thornton Tomasetti Inc.Newark, NJ · UEI M49JEJM411C5 | Newark | NJ | $0 |
| Thornton Tomasetti, Inc.Washington, DC · UEI G9JKKR6MPCQ1 | Washington | DC | Subcontractor |
| Thornton Tomasetti, Inc.Philadelphia, PA · UEI M2MNR6HM3C29 | Philadelphia | PA | Subcontractor |
| Thornton Tomasetti, Inc.Austin, TX · UEI CHQMJKY8DHE5 | Austin | TX | Subcontractor |
| Thornton Tomasetti, Inc.Boston, MA · UEI LN1GGNXLTH57 | Boston | MA | Subcontractor |
| Thornton Tomasetti, Inc.Los Angeles, CA · UEI Q641T1NGBLP1 | Los Angeles | CA | Subcontractor |
| Thornton Tomasetti, Inc.Fort Lauderdale, FL · UEI UV64D7TAX7S3 | Fort Lauderdale | FL | Subcontractor |
| Thornton Tomasetti Wilson Joint Venture | Albuquerque | NM | Subcontractor |
| Thorondor LLC | Lancaster | CA | Subcontractor |
| Thotpro, Inc. | Fairbanks | AK | Subcontractor |
| Tiburon Associates Inc. | Huntsville | AL | Subcontractor |
| Tidewater Air Balance, Inc. | Chesapeake | VA | Subcontractor |
| Tierra, Inc. | Tampa | FL | Subcontractor |
| Tierra Luna Engineering LLC | Stockton | CA | $0 |
| Tierra South Florida, Inc. | West Palm Beach | FL | Subcontractor |
| Timelproekt Doo Skopje | Skopje | | Subcontractor |
| Timitron Corporation | Philadelphia | PA | Subcontractor |
| Timonier Systems, LLC | El Segundo | CA | Subcontractor |
| Timothy Gates | Frederick | MD | Subcontractor |
| Titus Engineering, P.a | Winston Salem | NC | Subcontractor |
| TLC Engineering, Inc. | Houston | TX | $0 |
| TLF Inc. | Indianapolis | IN | $0 |
| Tma Muhendislik Limited Sirketi | Cankaya | | Subcontractor |
| T & M Associates | Middletown | NJ | Subcontractor |
| TMC2 Innovations LLC | Murrieta | CA | Subcontractor |
| TMCX Solutions LLC | Las Vegas | NV | Subcontractor |
| Tnwre Inc. | Honolulu | HI | Subcontractor |
| Toltz, King, Duvall, Anderson And Associates, Incorporated | Bloomington | MN | $0 |
| Tomczykowski Group, LLC | Edgewater | MD | Subcontractor |
| Tooling Technologies Inc. | New Freedom | PA | Subcontractor |
| Tor Engineering Corporation | Phoenix | AZ | $0 |
| Totalsim LLC | Dublin | OH | Subcontractor |
| Total Sustainment Engineering Solutions, LLC | Perry | GA | Subcontractor |
| Toth And Associates, Inc. | Springfield | MO | Subcontractor |
| Tourgee & Associates Inc. | Owings Mills | MD | Subcontractor |
| Toyama & Associates | Santa Clarita | CA | $0 |
| Toyota Motor Engineering & Manufacturing North America Inc. | Plano | TX | $0 |
| TP2 Engineering Inc. | Alabaster | AL | Subcontractor |
| T.P.F. - Engineering | Bruxelles | | Subcontractor |
| T Q M Associates, Inc. | La Mesa | CA | Subcontractor |
| Tractebel Engineering S.a. | Brussel | | Subcontractor |
| Traffiqure LLC | Wexford | PA | Subcontractor |
| Trafinfo Communications, Inc. | Woburn | MA | $0 |
| Trandes Corp. | San Diego | CA | $0 |
| Transmission & Distribution Services, LLC | Albuquerque | NM | Subcontractor |
| Transtechsol, LLC | Somerset | PA | Subcontractor |
| Transystems CorporationFort Worth, TX · UEI J3UJNN3NT5F8 | Fort Worth | TX | $0 |
| Transystems CorporationOrlando, FL · UEI YHBJWM91SBY8 | Orlando | FL | $0 |
| Trax International Corp. | Yuma | AZ | Subcontractor |
| TRC Energy Engineering, Professional Limited Liability Company | Jacksonville | FL | $0 |
| Treis Technologies LLC | Franklin | TN | Subcontractor |
| Trekk Design Group, LLC | Kansas City | MO | Subcontractor |
| Trevet-bay West Joint Venture II LLC | San Diego | CA | $0 |
| Triad Engineering Solutions Inc. | Carrollton | VA | Subcontractor |
| Tridentis Advanced Marine Vehicles LLC | Kailua Kona | HI | Subcontractor |
| Tridentis LLC | Norfolk | VA | Subcontractor |
| Tried & True Metrology LLC | Suffolk | VA | Subcontractor |
| Trimeric Corporation | Buda | TX | Subcontractor |
| Trinity Wireless Solutions Inc. | Fort Mill | SC | Subcontractor |
| Tri-star Design Inc. | Hopkinton | MA | Subcontractor |
| Tri-tech Associates, Inc. | Centerville | OH | Subcontractor |
| Triunity, Inc. | Denver | CO | Subcontractor |
| Triz Mt LLC | Highland Park | IL | Subcontractor |
| Trojanowski Dam Engineering, Limited | Littleton | CO | Subcontractor |
| Truenet Communications Corp. | Ponte Vedra | FL | $0 |
| Trussell Technologies, Inc. | Pasadena | CA | $0 |
| Trusted Solutions Group, LLC | San Diego | CA | Subcontractor |
| Truvision Solutions LLC | Melbourne | FL | $0 |
| Tryg Critical Solutions | Denver | CO | Subcontractor |
| TSM Technical Services, LLC | Delaplane | VA | Subcontractor |
| T-squared Professional Engineers Inc. | Vista | CA | Subcontractor |
| Tti Acquisition Corporation | Post Falls | ID | $0 |
| TTT Environmental, LLC | Anchorage | AK | Subcontractor |
| Tuazon Engineering, PLLC | Renton | WA | Subcontractor |
| Turbine Monitoring And Support Services, LLC | Atlanta | GA | Subcontractor |
| Turrell, Hall & Associates, Inc. | Naples | FL | Subcontractor |
| Turtle Island Communications Inc. | Minneapolis | MN | $0 |
| Twisthink, Inc. | Grand Rapids | MI | Subcontractor |
