| Certified Wire & Cabling | New Jersey |
| Certiflex Software, LLC | Texas |
| Certify, Inc. | Maine |
| CertifyOS, Inc. | |
| Certiified Computer Systems | Georgia |
| Certik | New York |
| Certinia | California |
| Certiprof | |
| Certis Oncology Solutions | California |
| Certive Health | |
| Certiverse | |
| Certstaffix Training | |
| CertSys | Pennsylvania |
| Certus International, Inc. | New Hampshire |
| Certusoft, Inc. | Minnesota |
| Cerulean Scientific | |
| Cerus Corporation | |
| Ceruvia Lifesciences | Connecticut |
| Cerveau Technologies | Massachusetts |
| Cervelle Software, Inc. | Florida |
| Cervello | Massachusetts |
| Cervin | California |
| Cervin | |
| CervoMed, Inc. | Massachusetts |
| Cervos Medical | Massachusetts |
| CES | Nevada |
| Cesco Technologies, LLC | |
| Cesium GS, Inc. | Pennsylvania |
| CesiumAstro, Inc. | Texas |
| Cessation Therapeutics | |
| Cetan Corporation | Virginia |
| CETEC ERP | Texas |
| CETech | |
| Cetrom Information Technology, Inc. | Maryland |
| Cetya Therapeutics, Inc. | |
| Cetylite, Inc. | New Jersey |
| Ceutical Labs | Texas |
| Ceva Technologies, Inc. | |
| CEVA, Inc. | California |
| CEW Systems Canada, Inc. | |
| CEWeek | New York |
| Ceylon Solutions | Colorado |
| Cezcon Solutions, LLC | |
| CF Software Consultants, Inc. | Virginia |
| CF Webtools | Nebraska |
| CFA Software | Illinois |
| CFD Research Corporation | Alabama |
| CFDynamics | Texas |
| CFEX, Inc. | California |
| CFG Systems, Inc. | Colorado |