- C Evans Consulting LLC
- C R Market Surveys Inc
- C-Cat, Inc.
- C.D.G. Systemic Solutions Corporation
- Cabildo Staffing, L.L.C.
- Cabin John Consulting Corp
- Cabletime, Ltd.
- Callahan Construction Company, Inc.
- Cameo Consulting Group, LLC
- Cannon Utility Services, LLC
- Cantle Technology Corporation
- Capital Investing Inc [DBA C I Transportation Services]
- Capitol Barricade, Inc.
- Capitol Management Consulting Services, Inc
- Caption First, Inc.
- Captura Group, Inc.
- Cardinal Technology Solutions, Inc.
- Care Publications, Inc.
- Careerstone Group LLC
- Carey & Company, Ltd.
- Carlos L. Lopez & Associates
- Carlyn Davis Casting & Productions Services Inc.
- Carmichael, Brasher, Tuvell & Company, PC.
- Carpet Resources Inc
- Carter-Hazel & Associates, Inc.
- Cartridge Technologies, Inc.
- Cascade Asset Management LLC
- CASE Healthcare Solutions, Inc.
- CATVIDEO, Inc
- CC&C Management Services LLC
- CCN International, Inc.
- Celerens, LLC
- Cemco-Custom Environmental Management Co., Inc.
- Cenmed Enterprises Inc.
- Centech Staffing LLC
- Center for Clear Communication Inc
- Center For Coaching Solutions LLC
- Centerpoint Strategic Business Services, LLC
- Central Research Inc
- CERAU Solutions LLC
- Certifi, Inc.
- cFocus Software Incorporated
- Champion Sales LLC
- Character Development & Leadership, LLC
- Chemco Industries Awarded 3rd Option to Deliver 4500 Cases of Latex Exam Gloves to GSA
- Chemco Industries, Inc.
- Chesapeake Healthcare Planning LLC
- Chief Technologies LLC
- Chinook Systems Inc.
- Chloeta Fire, L.L.C.
- Choicecomm LLC
- Ciracom Incorporated
- Ciyis LLC
- Clean Getaway Products LLC
- Clean Team Janitorial Service, Inc.
- ClearFlite Inc
- CLJ Consulting and Contracting LLC
- CLO Enterprises, LLC
- CMH Business Corporation
- CNC Consulting, Inc.
- Coast And Harbor Associates, Inc
- Coast Automation, Inc.
- Coastal Communications Consultants Inc.
- Cocklins Film & Video, Inc.
- Coeus Solutions, LLC
- Cogar Group, Ltd
- Cognitive Agility, LLC
- Cole Technology Solutions Group, LLC
- Coleman Consulting Group, LLC
- Colin K. Dunn And Associates LLC
- Collapsible Cooler Co., LLC
- Combat Medical Systems, LLC
- Command Services & Support, Inc.
- Commercial Facilities Management, Inc.
- Complete Marketing Resources Inc
- Complete Medical Solutions, LLC
- Computer Integration and Programming Solutions Corp
- Computer Marketing Associates Inc
- Computer Sites Inc.
- COMSO, INC.
- COM Systems Inc.
- Con Healy d/b/a Symmetrical Data Security, LLC
- Concentric Security LLC
- Concepts Inc
- Concrete Rose Scrubs LLC
- ConexSmart LLC
- Consilium Strategic Solutions, LLC
- constructNET International, Inc.
- Constructsecure, Inc.
- Contract Furnishings Inc
- Contracting Solutions, Inc.
- ContractUAV, LLC
- Copious Brand LLC
- Coray Gurnitz Consulting Inc
- CORE Survival Inc.
- Coreblox LLC
- CoreMedica Laboratories Inc
- Cork Tree Creative, Inc.
- Cormac Corporation
- Corneli Systems LLC
- Corner Alliance Inc.
- Corporate Valuation Advisors, Inc.
- CoSolutions, Inc.
- Covenant Electric, Inc.
- Coventry Industries LLC
- CoverCar, LLC
- Cox Machine LLC
- Cox Subscriptions, Inc.
- Craft Designs, Inc.
- Creative Concepts International Inc.
- Creative Systems and Consulting L.L.C.
- Creative Visions, LLC
- CRI Advantage, Inc.
- CRISP LLC
- Critical Power Consultants, Inc.
- Cropper Industries, LLC
- Crosscheck Technologies LLC
- Cross Management Services, Inc.
- Cruise Ventures, Inc.
- CRWI, LLC
- Crystal Enterprises, Inc.
- CSI Aviation, Inc.
- CSIOS Corporation
- CSMI, LLC
- CTA Consultants LLC
- CTI Energy Services LLC
- Cube Care, Co.
- Culpepper & Associates Security Services Inc.
- Curtis Manufacturing, Inc.
- Custom Software Systems, Inc.
- CustomerFirst Renewables LLC
- Cyber Sentinel Consulting, Inc.
- CyberDefenses, Inc.
- Cyberlocke, LLC
- Cybersecurity Professionals LLC
- Cyintech, Inc.
- Czero, Inc.