| Curiato, Inc. | |
| Current Studios | |
| Currents | |
| CurrentWare, Inc. | |
| Curtis International Ltd | Ontario |
| Curve Communications Group Ltd | British Columbia |
| Curvenote, Inc. | |
| Custom Biologics | |
| Custom Cable, Inc. | Ontario |
| Custom Card Canada | Ontario |
| Custom Controls, Inc. | British Columbia |
| Custom Data Centre Stettler Ltd | Alberta |
| Custom Fit Online | British Columbia |
| Custom Microsystems | Saskatchewan |
| Custom Rapid Solutions, Inc. | Ontario |
| Custom Software Development, Inc. | British Columbia |
| Custom Software Solutions, Inc. | Manitoba |
| Customer Contact Solutions | Ontario |
| Customized Computer Plus | Ontario |
| CustomizePress | British Columbia |
| CuteSoft Components, Inc. | Ontario |
| CuteTax, Inc. | Ontario |
| Cutting Edge Concepts, Inc. | British Columbia |
| Cutting Edge Digital Marketing | |
| CVC Communications Agency | Ontario |
| CWB Financial Group | Alberta |
| CWP Solutions | Ontario |
| CXO Business Intelligence Corporation | Ontario |
| CYA 365 | |
| Cyan Solutions Ltd | Ontario |
| Cyanic Automation Ltd | Alberta |
| Cyantic Systems Corporation | Ontario |
| Cybeats | Ontario |
| Cybells | |
| Cyber & Space Telecom, Inc. | Quebec |
| Cyber 3D | Quebec |
| Cyber Ace, Inc. | |
| Cyber Consulting Corporation | British Columbia |
| Cyber Cove Solutions, Inc. | British Columbia |
| Cyber Design Concepts | Ontario |
| Cyber PR Army Solutions | |
| Cyber Security Audit | Ontario |
| Cyber Security Canada | Ontario |
| Cybera | Alberta |
| Cyberatics | |
| CyberCap | Quebec |
| CyberCat | Quebec |
| CyberCréation | Quebec |
| Cyberdefense.ai | Quebec |
| Cyberdefense.AI | |