| C.I.M. Solutions, Inc. | Ontario |
| C.R.C Ordinateurs | Quebec |
| C2 Innovations, Inc. | Quebec |
| C2 ITSM | |
| C2 Montréal | Quebec |
| C2B, Inc. | Quebec |
| C2RO | |
| C3 Insight Group, Inc. | Ontario |
| C3 Solutions | |
| C3 Solutions, Inc. | Quebec |
| C3F Consultants, Inc. | Quebec |
| C3i Center | Quebec |
| C3pH | |
| C3RiOS Systems, Inc. | |
| C4i Consultants, Inc. | Alberta |
| CA Domains | British Columbia |
| CA Registry | Ontario |
| CA404 | Ontario |
| Caary Capital | Ontario |
| Cabco | Nova Scotia |
| Cabcor Industries, Inc. | |
| Cabinet Créatif | |
| Cable & Telecommunications Association for Marketing Canada | Ontario |
| Câble Axion | Quebec |
| Cable Cable, Inc. | Ontario |
| Câble et Son Cinéma-Maison Sonorisation Domotique | Quebec |
| Cable Leafs Consultancy, Inc. | |
| Cable Ready Systems Ltd | Ontario |
| Cable Sales Canada | Ontario |
| Cable-Lock Connectors | Ontario |
| Cableflo International, Inc. | Quebec |
| Cablek Industries | Quebec |
| CableServ, Inc. | Ontario |
| CableTiesAndMore.ca | Ontario |
| Cablevision du Nord du Québec, Inc. | Quebec |
| Cabling Hub Canada | Ontario |
| Cablovision Warwick, Inc. | Quebec |
| Cabro Communications | British Columbia |
| CacheFlo, Inc. | Nova Scotia |
| CACIFTD Charlevoix | Quebec |
| CAD MicroSolutions, Inc. | Ontario |
| CAD Systems Consultants | Ontario |
| CAD Wire | Ontario |
| CAD-CAM Services | Quebec |
| Cadabra Solutions, Inc. | |
| CADcentre | |
| CADD Solutions, Inc. | British Columbia |
| Cadence Automation, Inc. | Quebec |
| CadenceBot | |
| Cadency | |