| Church Plant Media | Missouri |
| Church Windows | Ohio |
| ChurchAssist Technologies | Indiana |
| Churchsoft | South Carolina |
| Churchteams.com, Inc. | Nebraska |
| Churn Buster | California |
| ChurnZero | District of Columbia |
| Churr Software | Alabama |
| Chykalophia Group, LLC | |
| ChyronHego | New York |
| CI Capital Partners, LLC | New York |
| Ci Consultants, LLC | Alaska |
| CI Design, Inc. | |
| CI Design, LLC | Montana |
| CI Systems, Inc. | |
| CI Web Design, Inc. | Michigan |
| CI Web Group, Inc. | Texas |
| CI-Interactive | Florida |
| Ciampa Creative, LLC | |
| Ciao Systems, Inc. | Virginia |
| Ciao Wireless, Inc. | California |
| Ciba Health | |
| Ciberco International | Pennsylvania |
| Cibgraphics Design Studio | |
| CIBNET | California |
| CIBO Technologies | Massachusetts |
| CIC Credit | |
| CIC Innovation Services, LLC | Massachusetts |
| Cicada Consulting Group | North Carolina |
| Cicero Diagnostics | |
| CicloMed, LLC | Missouri |
| Cicon Engineering, Inc. | California |
| CICube, Inc. | |
| Cien.ai | Florida |
| Ciena Corporation | Maryland |
| Cienaga Systems, Inc. | Florida |
| CierraCom Systems | Nevada |
| CIFC Asset Management | |
| CIFC, LLC | |
| Cifnet, Inc. | Illinois |
| Cignex | California |
| Cigniti, Inc. | Texas |
| Cii Associates, Inc. | North Carolina |
| Ciirus, Inc. | Florida |
| CIM Concepts, Inc. | Florida |
| CIM Systems, Inc. | Indiana |
| Cima Solutions Group, LLC | Texas |
| Cimarron Software, Inc. | Florida |
| Cimarron Systems, LLC | Colorado |
| Cimarron Technology, Inc. | Idaho |