| Corefiling Limited | Oxford | | Subcontractor |
| Corehive Computing LLC | Clarksburg | MD | Subcontractor |
| Coresys Federal, LLC | Lorton | VA | Subcontractor |
| Coretech LLC | Chantilly | VA | Subcontractor |
| Core Technology Corporation | Niagara Falls | NY | $0 |
| Cornerstone Integration, Inc. | Leavenworth | KS | Subcontractor |
| Cornerstone Technology Enterprises Inc. | Littleton | CO | Subcontractor |
| Cornerstonex LLC | Palm Beach Gardens | FL | Subcontractor |
| Corporacion Sidif Del Caribe | San Juan | PR | $0 |
| Corporate Web Services, Inc. | Buckeye | AZ | $0 |
| Cortado Inc. | Denver | CO | $0 |
| Corvid HPC, LLC | Mooresville | NC | Subcontractor |
| Cosologic, LLC | Huntsville | AL | Subcontractor |
| Cosylab USA Inc. | Palo Alto | CA | Subcontractor |
| Cravens Solutions, LLC | Gulfport | MS | Subcontractor |
| Crazy Train Consulting, LLC | Orlando | FL | Subcontractor |
| Crea - Ko SH.P.K. | Prishtine | | $0 |
| Creative American Consultants, Inc. | Pembroke Pines | FL | Subcontractor |
| Crema Development LLC | Olympia | WA | Subcontractor |
| Crisafulli Consulting, Inc. | Germantown | MD | $0 |
| Crowbar Security Solutions LLC | Malta | OH | Subcontractor |
| Crow King Studios, LLC | Baton Rouge | LA | $0 |
| Cruset Group Inc. | Dunkirk | MD | Subcontractor |
| CRW One Group LLC | New Market | MD | $0 |
| Crypkey Canada Inc. | Calgary | AB | $0 |
| CSM Products And Services LLC | Houston | TX | Subcontractor |
| Csoft Cloud Technology Sas LLC | South Bound Brook | NJ | Subcontractor |
| Cue Audio, Inc. | Albany | TX | $0 |
| Custom Computer Services Inc. | Waukesha | WI | $0 |
| Custom Consulting Associates LLC | Oklahoma City | OK | Subcontractor |
| Cyber Innovations, LLC | Great Falls | VA | Subcontractor |
| Cybernet Systems Corporation | Orlando | FL | Subcontractor |
| Dakota Performance Solutions, Inc. | Sioux Falls | SD | $0 |
| Daniels Associates Inc. | Indianapolis | IN | Subcontractor |
| Dansources Technical Services, Inc. | Rockville | MD | Subcontractor |
| Daptiv Solutions, LLC | Austin | TX | Subcontractor |
| Dark Circuit Labs, Inc. | Chantilly | VA | Subcontractor |
| Dark Matter LLC | Oviedo | FL | Subcontractor |
| Dark Wolf Solutions, LLC | College Park | MD | Subcontractor |
| Data Base Connection Inc. | Ocean City | MD | Subcontractor |
| Data Capital Inc. | Manassas | VA | Subcontractor |
| Data Care (u) Ltd. | Kampala | | Subcontractor |
| Datacenter Services Inc. | Sandston | VA | $0 |
| Datacrunch Lab, L.L.C | Cary | NC | $0 |
| Dataequip, Inc. | Highlands Ranch | CO | $0 |
| Dataflow Security US Inc. | New York | NY | Subcontractor |
| Datahouse Consulting Inc. | Honolulu | HI | $0 |
| Data Intelligence Technologies Inc. | Annapolis | MD | Subcontractor |
| Data Matrix Solutions Inc. | Herndon | VA | Subcontractor |
| Data Mountain Solutions Inc. | Annapolis | MD | $0 |
| Datanet Systems Corporation | Washington | DC | Subcontractor |
| Data Particles LLC | Reston | VA | Subcontractor |
| Data Research Group Corporation | Culpeper | VA | $0 |
| Data Solutions Inc. | Wixom | MI | Subcontractor |
| Data Storage Group, Inc. | Longmont | CO | $0 |
| Data Surge LLC | Folsom | CA | Subcontractor |
| Datawizards Computer Consulting LLC | Cedar Crest | NM | Subcontractor |
| Dataworks Plus, LLC | Greenville | SC | $0 |
| Datumatica LLC | Falls Church | VA | Subcontractor |
| Datumsoft Technologies, Inc. | Vienna | VA | Subcontractor |
| Datwiz LLC | Centreville | VA | Subcontractor |
| Da Vinci Tree Inc. | O Fallon | IL | Subcontractor |
| Dbdriven.net LLC | Manassas | VA | Subcontractor |
| Dbi Solutions LLC | Springboro | OH | Subcontractor |
| Dbitpro LLC | Debary | FL | Subcontractor |
| Db Technology Solutions Inc. | Lutz | FL | Subcontractor |
| Decisive Technologies LLC | Sewell | NJ | Subcontractor |
| Deepbits Technology Inc. | Riverside | CA | $0 |
| Deft Consulting Inc. | Arlington | VA | Subcontractor |
| Dekalb Solutions LLC | Fairfax | VA | Subcontractor |
| Delaero Inc. | Carlisle | MA | Subcontractor |
| Delixus | Concord | CA | $0 |
| Delphi Technology Inc. | Chantilly | VA | Subcontractor |
| Delta Computer Solutions Inc. | San Francisco | CA | Subcontractor |
| Delta Corporate Services, Inc. | Belle Mead | NJ | Subcontractor |
| Delta Lima, LLC | Olney | MD | Subcontractor |
| Delta Risk LLC | San Antonio | TX | Subcontractor |
| Denali Data Systems, Inc. | Conroe | TX | Subcontractor |
| Denim Computer Systems Inc. | Brewster | MA | Subcontractor |
| Deosi LLC | Vienna | VA | Subcontractor |
| Derrick L Head, LLC | Bowie | MD | Subcontractor |
| Development Gateway Inc. | Washington | DC | Subcontractor |
| Dev Force, LLC | Chantilly | VA | Subcontractor |
| Dhananjaya Associates LLC | Ashburn | VA | Subcontractor |
| Diffbot Technologies Corp. | Menlo Park | CA | Subcontractor |
| Digital Capstone Inc. | Saint Johns | FL | $0 |
| Digital Design Services, Inc. | Green Bay | WI | $0 |
| Digital Harmonic LLC | Columbia | MD | Subcontractor |
| Digital Lantern Federal, LLC | Pasadena | MD | Subcontractor |
| Digital Lantern LLC | Hanover | MD | Subcontractor |
| Digital Operatives LLC | Dunn Loring | VA | Subcontractor |
| Digital Polygon LLC | Poolesville | MD | Subcontractor |
| Digitran Technologies Inc. | Fairfax | VA | Subcontractor |
| Digi Trax Corp. | Lincolnshire | IL | $0 |
| Dimensional Control Systems Inc. | Troy | MI | Subcontractor |
| Dios-tech, LLC | Leesburg | VA | Subcontractor |
| Direccion Y Proyectos De Salud Academicos, S.a.s. De C.v. | Ciudad De Mexico | | $0 |
| Disoka Incorporated | Warrenton | VA | Subcontractor |
| Distat Co. | Kennett Square | PA | $0 |
| Distributed Management Task Force, Inc. | Portland | OR | $0 |
