| Clarity Partners, L.P. | California |
| Clarity Services, Inc. | |
| Clarity Software Systems | Missouri |
| Clarity Squared, LLC | Pennsylvania |
| Clarity Web Studio | California |
| Claritysoft | Ohio |
| Clarix Imaging | Illinois |
| ClariX Technologies | |
| Clark Atlanta University | Georgia |
| Clark College | Washington |
| Clark College Computer Science Department | Washington |
| Clark Computer Serivces | Florida |
| Clark Labs | Massachusetts |
| Clark Nuber PS | Washington |
| Clark State College | Ohio |
| Clark University | Massachusetts |
| Clark University Department of Computer Science | Massachusetts |
| Clark Wire & Cable | Illinois |
| Clarke Energy | |
| Clarke University | Iowa |
| Clarkson College | Nebraska |
| Clarkson University | New York |
| Clarkson University Computer Science Department | New York |
| Clarkson University Department of Electrical & Computer Engineering | New York |
| Clarkson University Mathematics Department | New York |
| Clarkston Consulting | North Carolina |
| Clarktel Telecommunications | Ohio |
| Claro Analytics | New Hampshire |
| Claro Puerto Rico | Puerto Rico |
| Claros | |
| Claroty | New York |
| Claroty | |
| Clarus Biologics, Inc. | North Carolina |
| Clarus Communications | Missouri |
| Clarus Medical, LLC | Minnesota |
| Clarus Tech Partners, Inc. | |
| ClarusTec, Inc. | New Jersey |
| Clary Corporation | California |
| Clasp | |
| Clasp Therapeutics | |
| Clasp, Inc. | |
| Class Central | California |
| Class Companion | |
| Class Mate Software | Texas |
| Class Twist, Inc. | California |
| ClassApps, Inc. | Kansas |
| ClassBug | Illinois |
| ClassByte | New Mexico |
| Classbyte | |
| Classic Advanced Development System, Inc. | Michigan |