| C2RO |
| Caast.TV |
| Cahoot |
| Capgemini |
| CB4 |
| CBX Software |
| CDW |
| Celerant Technology Corporation |
| Celona |
| Censia |
| Centric Software |
| Ceridian |
| Chargebacks911 |
| Check Point Software Technologies |
| Checkpoint Systems, Inc. |
| CI&T |
| Cisco |
| Cisco Meraki |
| CITCON |
| Cloudreach |
| CMV Informatics |
| Comcast Business |
| ComQi Inc. |
| Corra |
| Coveo |
| Crane Payment Innovations |
| Cybage Software Inc. |
