| Centurion Technologies | Missouri |
| Century 23 | Nevada |
| Century Business Products, Inc. | South Dakota |
| Century Business Technologies, Inc. | Kansas |
| Century College | Minnesota |
| Century College Computer Information Systems | Minnesota |
| Century College Computer Science | Minnesota |
| Century College Cybersecurity Forensics and Information Assurance | Minnesota |
| Century Marketing, Inc. | |
| Century Software Group | New York |
| Century Software, Inc. | Utah |
| Century Systems | Ohio |
| Century Therapeutics | |
| CenturyLink | Louisiana |
| CEO Computers, Inc. | California |
| CEO Software | Texas |
| Ceph file system | |
| Ceph.io | California |
| Cepham Life Sciences | |
| Cepheid | California |
| CephX | Delaware |
| Cepstral | Pennsylvania |
| Cepton, Inc. | |
| Cequence Security, Inc. | California |
| CeQur Corporation | South Carolina |
| Ceragon Networks | New Jersey |
| CeraNet, Inc. | Ohio |
| Cerapedics, Inc. | Colorado |
| Cerb | California |
| Cerberus | Virginia |
| Cerberus Agency | |
| Cerberus Therapeutics | |
| Cerberus Therapeutics | |
| Cerby | California |
| Cercle.ai, Inc. | |
| Cerdonis Technologies, LLC | Illinois |
| CerebraAI, Inc. | |
| Cerebral Media | California |
| Cerebras | California |
| Cerebras | |
| Cerebrealm, Inc. | California |
| Cerebri AI | Texas |
| Cerebris Corporation | New Hampshire |
| Cerebrum Corporation | Arizona |
| Cerebrum Infotech | California |
| CEREBRUMX Labs, Inc. | Michigan |
| Cerecin, Inc. | Colorado |
| CereMark Pharma | |
| Ceremorphic, Inc. | California |
| Cerenade | California |