| Cutting Edge Communications, LLC | Huntington Beach | CA | Subcontractor |
| Cvaldo Corporation | La Jolla | CA | Subcontractor |
| CVS, Inc. | Mount Airy | MD | Subcontractor |
| Cxa Services, L.L.C. | Lafayette | LA | Subcontractor |
| Cyadacore Inc. | Bel Air | MD | Subcontractor |
| Cyber Cloud Technologies LLC | Elkridge | MD | Subcontractor |
| Cyber Eye Solutions, LLC | Palm Harbor | FL | Subcontractor |
| Cyber Offset Alliance LLC | North Charleston | SC | Subcontractor |
| Cyber-secure Software Solutions, Inc. | Owens Cross Roads | AL | Subcontractor |
| Cyberspec, LLC | Waldorf | MD | Subcontractor |
| Cyberworx, LLC | Jamul | CA | Subcontractor |
| Cybioms Corporation | Rockville | MD | Subcontractor |
| Cybrex LLC | Chesapeake | VA | Subcontractor |
| Cyganiewicz Geotechnical LLC | Bradenton | FL | Subcontractor |
| Cyient Inc. | East Hartford | CT | Subcontractor |
| Cysec Consulting, LLC | Orlando | FL | Subcontractor |
| Cyth Systems, Inc. | San Diego | CA | Subcontractor |
| Dacco Sci, Inc. | Columbia | MD | $0 |
| Dack Consulting Solutions, Inc. | White Plains | NY | Subcontractor |
| Daedalus Inc. | Pittsburgh | PA | Subcontractor |
| Dahl Consultants Inc. | Cooperstown | ND | Subcontractor |
| Dahl Robins & Associates Inc. | Yuma | AZ | Subcontractor |
| Dale Hafer | Wilmington | NC | Subcontractor |
| Dale M Pitt Engineering LLC | Saint Louis | MO | Subcontractor |
| Dana Engineering Inc. | Kennewick | WA | $0 |
| Daniel Consultants, Inc. | Columbia | MD | $0 |
| Daring Engineering LLC | Long Beach | CA | Subcontractor |
| Data-comm Corp. The | Toa Baja | PR | $0 |
| Data Control Systems Inc. | Wadsworth | OH | $0 |
| Daudi M Barnes | Durango | CO | $0 |
| David L. Adams Associates, Inc. | Denver | CO | Subcontractor |
| David Mark Lambeth | Aledo | TX | Subcontractor |
| David Mason & Associates, Inc. | Saint Louis | MO | Subcontractor |
| David Squires | Ashford | CT | Subcontractor |
| Davis Bowen & Friedel Inc.Easton, MD · UEI EBGMKWFZB679 | Easton | MD | $0 |
| Davis Bowen & Friedel Inc.Milford, DE · UEI T7QGN6WGDCA3 | Milford | DE | Subcontractor |
| Davis Bowen & Friedel Inc.Salisbury, MD · UEI YJSGLFVWU6E9 | Salisbury | MD | $0 |
| Davis & Floyd, Inc. | Greenwood | SC | $0 |
| Davis-martin-powell & Associates, Inc. | High Point | NC | $0 |
| Dav-lear Systems, Inc. | Diamond Bar | CA | Subcontractor |
| Day & Zimmermann International, Inc. | Philadelphia | PA | $0 |
| DCCM USA Corp. | Fishers | IN | $0 |
| DC Engineering Consulting, Inc. | Tenino | WA | Subcontractor |
| DC Engineering, Inc. | Meridian | ID | Subcontractor |
| Dcse, Inc. | Laguna Hills | CA | $0 |
| DDG Virginia Engineering PC | Fairfax | VA | $0 |
| Dean Tekell Consulting LLC | Lafayette | LA | $0 |
| Dearborn Group Inc. | Farmington | MI | Subcontractor |
| Decision Enterprises, Inc. | Cleveland | OH | Subcontractor |
| Decision Technologies Inc. | Virginia Beach | VA | Subcontractor |
| Decisive Intelligence Inc. | Huntsville | AL | Subcontractor |
| Decisive Military Solutions, LLC | Upper Marlboro | MD | Subcontractor |
| Deck Four Innovation, Inc. | Merritt Island | FL | Subcontractor |
| Decon Engineering Inc. | Sterling | VA | Subcontractor |
| Dedc, LLC | Newark | DE | Subcontractor |
| Dedicated Roof And Hydro-solutions, LLC | Marietta | GA | Subcontractor |
| Deep Insight Solutions, Inc. | Nashville | TN | Subcontractor |
| Deepwater Corrosion Services, Inc. | Houston | TX | $0 |
| Defense Management Co. Inc. | Sterling | CO | Subcontractor |
| Defense Microelectronics Activity | Mcclellan | CA | Subcontractor |
| Defense Planning Group | Madison | AL | Subcontractor |
| Defense Systems And Services LLC | Yorktown | VA | Subcontractor |
| Defience Systems, Inc. | Owens Cross Roads | AL | Subcontractor |
| Define Design Deploy Corp. | West Henrietta | NY | Subcontractor |
| Defined Source Cooperative Inc. | Lansdale | PA | Subcontractor |
| Degenkolb Engineers | San Francisco | CA | Subcontractor |
| Dejong & Lebet, Inc. | Jacksonville | FL | Subcontractor |
| Dell Consulting LLC | Pensacola | FL | Subcontractor |
| Del Mar Oceanographic LLC | San Diego | CA | Subcontractor |
| Del-mar Solutions Inc. | Orlando | FL | Subcontractor |
| Delscan LLC | Auburn Hills | MI | $0 |
| Delsontro Enterprises LLC | Leesburg | VA | Subcontractor |
| Delta Coast Consultants LLC | Houma | LA | Subcontractor |
| Delta Engineering Group, LLC | Augusta | GA | Subcontractor |
| Delta G Design, Inc. | Hewitt | TX | Subcontractor |
| Deltech Kiln & Furnace Design LLC | Denver | CO | $0 |
| Demase Technical Services, LLC | Powell | TN | Subcontractor |
| Depositech, Inc. | Colleyville | TX | $0 |
| Design Engineering Inc. | Metairie | LA | Subcontractor |
| Design Engineers, Inc. | Cedar Rapids | IA | $0 |
| Design Innovation Inc. | Melrose | MA | Subcontractor |
| Design Interface Inc. | Finksburg | MD | Subcontractor |
| Designlinx Hardware Solutions, LLC | Nashua | NH | Subcontractor |
| Design Management Group, LLC | Pittston | PA | Subcontractor |
| Design Right, Inc. | Arlington | TX | Subcontractor |
| Design Teams, Inc. | Annapolis | MD | Subcontractor |
| Design West Engineering, Inc. | San Bernardino | CA | Subcontractor |
| Despiau Associates Corp. | San Juan | PR | Subcontractor |
| Detroit Defense, Inc. | Sterling Heights | MI | Subcontractor |
| Detroit Engineered Products Inc. | Troy | MI | Subcontractor |
| Dettx LLC | Southlake | TX | Subcontractor |
| Device Analytics, LLC | Carlsbad | CA | Subcontractor |
| Dewberry-al Designers PC | Fairfax | VA | Subcontractor |
| Dewberry Del Caribe LLC | Fairfax | VA | $0 |
| DGR Consultants, LLC | Dallas | TX | Subcontractor |
| D. Hertel & Associates, LLC | Bozeman | MT | Subcontractor |
| D&H Global Enterprise LLC | Milwaukee | WI | $0 |
| Diaz Consultants, Inc. | Santa Ana | CA | Subcontractor |
| Dibble & Associates Consulting Engineers, Inc. | Phoenix | AZ | Subcontractor |
| Dice Defense LLC | Orlando | FL | Subcontractor |
