| Strategic Maintenance Solutions Inc. | Gorham | ME | Subcontractor |
| Strategic Sight Consulting LLC | Warrenton | VA | Subcontractor |
| Strategic Synergies, LLC | Chevy Chase | MD | Subcontractor |
| Stratified Technologies LLC | Whispering Pines | NC | Subcontractor |
| Stress Guys, Inc. | Houston | TX | Subcontractor |
| Stringer Anthony Y | Atlanta | GA | $0 |
| Sugarcreek Research LLC | Dayton | OH | Subcontractor |
| Sukin Hope | Boynton Beach | FL | $0 |
| Sunil B Lal | Library | PA | $0 |
| Supplytrust Technologies, LLC | Winston Salem | NC | Subcontractor |
| Susca LLC | Sheridan | WY | Subcontractor |
| Sustainable Design Consulting, LLC | Richmond | VA | Subcontractor |
| Sustanable Energy Advantage LLC | Framingham | MA | Subcontractor |
| Swift, Gregory W | Santa Fe | NM | $0 |
| Swindle Marvin M | Marshall | NC | $0 |
| Synapse Energy Economics, Inc. | Cambridge | MA | Subcontractor |
| T-3 Solutions, LLC | Grovetown | GA | Subcontractor |
| T4 Solutions, LLC | Buckeye | AZ | Subcontractor |
| Tab Space Technologies LLC | Albuquerque | NM | Subcontractor |
| Tailored Solutions LLC | Arlington | VA | Subcontractor |
| Talib Syed And Associates, Inc. | North Richland Hills | TX | Subcontractor |
| Tas Professional, Ltd. | Newport News | VA | Subcontractor |
| T. Bear Larson & Associates, Inc. | Fairfax Station | VA | Subcontractor |
| TC9 Inc. | Pittsboro | NC | $0 |
| Tclarcher Solutions, LLC | Helotes | TX | Subcontractor |
| Tech Analysis Inc. | Washington | DC | Subcontractor |
| Technical Resource Center, Inc. | Huntington Beach | CA | $0 |
| Technoleap Inc. | Ormond Beach | FL | $0 |
| Technologies Engineering Inc. | Berlin | MD | Subcontractor |
| Technology Consulting Labs, Inc. | Port Jefferson Station | NY | $0 |
| Technology International Inc. | Powhatan | VA | Subcontractor |
| Technology Management Solutions LLC | Arlington | VA | Subcontractor |
| Teconomy Partners LLC | Columbus | OH | $0 |
| Teksolv Inc. | Newark | DE | $0 |
| Terrasense LLC | Columbus | OH | Subcontractor |
| Test Evaluation And Management, Inc. | Carlsbad | CA | Subcontractor |
| Teton Environmental Health LLC | Ririe | ID | Subcontractor |
| Texas Space Technology Applications & Research LLC | Bryan | TX | $0 |
| Textile Made Inc. | Howell | MI | Subcontractor |
| Tfranz Consulting, LLC | Holbrook | NY | Subcontractor |
| Tharsis Inc. | Gaithersburg | MD | $0 |
| The Bollason Group LLC | Fairfax | VA | Subcontractor |
| The Chameleon Group, Inc. | Woodland Hills | CA | $0 |
| The Earth Genome | Los Altos | CA | $0 |
| The Energy And Resources Institute | New Delhi | | Subcontractor |
| The Essex Partnership LLC | Ivoryton | CT | $0 |
| The Global Health Impact Group LLC | Atlanta | GA | Subcontractor |
| The Institute For Global Environmental Strategies, Inc. | Reston | VA | $0 |
| The Jacman Group | Biddeford | ME | $0 |
| The Jpi Group LLC | Philadelphia | PA | Subcontractor |
| The National Latino Behavioral Health Association | Santa Fe | NM | $0 |
| The Oakleaf Group LLC. | Sandy Spring | MD | Subcontractor |
| The Palatin Group Limited | Arlington | VA | Subcontractor |
| The Peregrine Corporation | Fogelsville | PA | $0 |
| The Piscopo Group, LLC | Arlington | VA | $0 |
| The Qlever Company, LLC | Rochester | IN | Subcontractor |
| Therax, Inc. | Arlington | VA | $0 |
| Thermochem Recovery International Inc. | Baltimore | MD | Subcontractor |
| The Safety Man, LLC | Bowie | MD | $0 |
| The Shattuck Group LLC | Herndon | VA | $0 |
| The Smullin Corporation, Inc. | Salem | MA | Subcontractor |
| The Soufan Group LLC | New York | NY | Subcontractor |
| The Tor Project Inc. | Winchester | NH | Subcontractor |
| The University Of Rhode Island Research Foundation | Kingston | RI | Subcontractor |
| The Whitley Group LLC | Richfield | OH | $0 |
| Think-dragon LLC | Ellicott City | MD | Subcontractor |
| Think Strategically LLC | Albuquerque | NM | Subcontractor |
| Third Ridgeline LLC | Littleton | CO | Subcontractor |
| Thomas H Proeschel Consulting | Williamsburg | VA | Subcontractor |
| Thomas & Moore Strategic Ventures LLC | Towson | MD | Subcontractor |
| Tidal Technologies Corporation | Glen Burnie | MD | Subcontractor |
| Tmit Consulting, LLC | Naples | FL | Subcontractor |
| Todd Michael Martin | Port Orchard | WA | Subcontractor |
| Tooze Janet | Winston Salem | NC | $0 |
| Total Intelligence Group Inc. | Naples | FL | $0 |
| Total Systems Commissioning, Inc. | Atlanta | GA | Subcontractor |
| Toton, LLC | Reston | VA | Subcontractor |
| Traffic Injury Research Foundation USA Inc. | Edina | MN | $0 |
| Trebor Systems, LLC | South Glastonbury | CT | $0 |
| Tribology Science Insight LLC | Conway | SC | $0 |
| Trinity Physics Consulting LLC | Houston | TX | $0 |
| TRN - The Research Network Ltd. | Sandwich | | Subcontractor |
| Tropical Health LLP | North Harrow | | Subcontractor |
| True North Sustainable Development Solutions LLC | Anchorage | AK | Subcontractor |
| Trusted Metal LLC | El Paso | TX | Subcontractor |
| Tsentr Efektyvnogo Energovykorystannya, Tov | Kyiv | | Subcontractor |
| Turing Innovations Limited | London | | $0 |
| Uas Consulting Group LLC | Roseville | CA | Subcontractor |
| Universities Research Association, Inc. | Washington | DC | $0 |
| V5 Holdings LLC | Tilghman | MD | Subcontractor |
| Valityx, Inc. | Alexandria | VA | Subcontractor |
| Valor Advisors Inc. | Encinitas | CA | $0 |
| Vehicle Systems Development Corporation | Toronto | ON | Subcontractor |
| Venova Technologies | Redondo Beach | CA | Subcontractor |
| Ventura Energy Systems LLC | Huntington Beach | CA | $0 |
| Vermont Energy Investment Corporation | Winooski | VT | Subcontractor |
| Vermont Program For Quality In Health Care, Inc. The | Montpelier | VT | Subcontractor |
| Vertical Transport Consulting, LLC | Wheeling | WV | $0 |
| Vertical Up Enterprises, LLC | Falls Church | VA | Subcontractor |
| Vespa Group LLC | Carmel | IN | Subcontractor |
