| Cornerstone, Inc. | California |
| Cornerstone.IT | New York |
| Cornestone Angels | Illinois |
| Cornet Technology | Virginia |
| Cornfed Systems, LLC | Colorado |
| Corning, Inc. | Arizona |
| Cornucopia Software | California |
| Coroflot | |
| Corona Aerospace, Inc. | |
| Corona Labs, Inc. | California |
| Corpay | Georgia |
| Corpay One | Georgia |
| CorpImages.net | District of Columbia |
| Corporate Communications and Data Systems, Inc. | Pennsylvania |
| Corporate Communications, Inc. | New York |
| Corporate Computer Cleaners | California |
| Corporate Computing, Inc. | Louisiana |
| Corporate Services, LLC | Louisiana |
| Corporate Solutions of Central Florida | Florida |
| Corporate Systems Resources, Inc. | District of Columbia |
| Corporate Technologies, LLC | Idaho |
| Corporate Technology Partners, Inc. | Colorado |
| Corporate Web Services, Inc. | Minnesota |
| Corporate West | California |
| Corporate360 | California |
| CorporateInformation | |
| Corporation for National Research Initiatives | |
| Corporation Service Company | Delaware |
| Corporation Wiki | |
| Corpsoft Solutions, LLC | |
| Corptek Solutions | Texas |
| CorralData | New York |
| Corrections Software Solutions, L.P. | Texas |
| Correlation Ventures | California |
| Correlative | Florida |
| Correlia Biosystems | California |
| CORRIDOR | Texas |
| Corridor Consulting, Inc. | Massachusetts |
| Corridor Design, LLC | |
| Corridor Web Agency | |
| Corrigan Consulting | Illinois |
| CorroHealth, Inc. | |
| Corry Micronics, Inc. | Pennsylvania |
| Corsa Ventures | Texas |
| CORSAIR | California |
| Corsair Capital, LLC | New York |
| Corsair Phama, Inc. | |
| Corsearch, Inc. | New York |
| Corsec Security, Inc. | Virginia |
| Corserv Holdings, Inc. | Georgia |