| COMPanion Corporation | Utah |
| Companion Software | Massachusetts |
| CompanionLink Software, Inc. | Oregon |
| Company 119 | |
| Company 50, Inc. | Rhode Island |
| Company Ventures | New York |
| CompanyMileage.com | |
| Comparatio USA, LLC | Minnesota |
| Comparative Biosciences, Inc. | California |
| Compare Computers, LLC | Kansas |
| Compass Business Solutions, Inc. | Pennsylvania |
| Compass Datacenters | Texas |
| Compass Marketing, Inc. | Maryland |
| Compass Technologies International, LLC | Arizona |
| Compass Therapeutics, Inc. | Massachusetts |
| Compasscom, Inc. | Colorado |
| CompassMSP | |
| CompatibL Technologies, LLC | New Jersey |
| Compatible Electronics, Inc. | California |
| Compbiz, Inc. | Florida |
| Compcare Services | California |
| Compel Interaction | Illinois |
| Comperemedia | Illinois |
| Compete Local | Michigan |
| Competera Ltd | California |
| Competitive Computer Solutions, Inc. | Pennsylvania |
| Competitive Computing, Inc. | Vermont |
| Competitive Enterprise Institute | District of Columbia |
| CompilerJobs.com | California |
| COMPITSS, Inc. | California |
| Complete Billing Systems | Pennsylvania |
| Complete Clinic Software | Tennessee |
| Complete Communications | Utah |
| Complete Computers | Mississippi |
| Complete Computing Services | Texas |
| Complete Controls, Inc. | Indiana |
| Complete Genomics | California |
| Complete Health | |
| Complete Intelligence | Texas |
| Complete Interactive Technologies, Inc. | Michigan |
| Complete IT Evolved | |
| Complete Media, Inc. | South Dakota |
| Complete Medical Solutions, LLC | Louisiana |
| Complete Network Management, Inc. | Louisiana |
| Complete SEO | |
| Complete Solutions | New Jersey |
| Complete Systems Design Information Technology Solutions | California |
| Complete Technical Solutions, Inc. | Ohio |
| Complete Web Charleston, LLC | South Carolina |
| Complete Webdesign Solution | |