| Cookie Works | Ontario |
| CoolIT Systems | Alberta |
| Coolshrimp | Ontario |
| COOP Cablo-Leeds | |
| Coop Carbone | Quebec |
| Cooper Web Design | Ontario |
| Coopérathon | Quebec |
| Coopérative Antenne TV St-Zacharie | |
| Coopérative Belvédère | |
| Coopérative Câblodistribution Ste-Catherine-Fossambault | Quebec |
| Coopérative de câblodistribution Ste-Clotilde | |
| Coopérative de développement régional du Québec | |
| Cooperstock Software | Ontario |
| Cooptel | Quebec |
| Coordinated Accessible National Health Network | |
| Copernic | Quebec |
| Copie-Conforme | Quebec |
| CoPilot AI | |
| CoPower, Inc. | Quebec |
| CopperCAD Design | Ontario |
| Copperhead | |
| Copperstone Technologies Ltd | Alberta |
| CopperTree Analytics | |
| CopperTree Analytics Ltd | |
| CopperTree Solutions, Inc. | Ontario |
| Copsys | |
| Copycave, Inc. | |
| Coquitlam College | |
| Coquitlam Computer Repair | British Columbia |
| Cor Consulting | Ontario |
| Coractive, Inc. | Quebec |
| Coradix Technology Consulting Ltd | Ontario |
| Coral | |
| Coralus | |
| Corbel 3D | |
| Corby Simpson | Ontario |
| Cordelio Power | |
| Cordus Technologies, Inc. | |
| Core 1 | Ontario |
| CORE Broadband | Ontario |
| Core Computers | Ontario |
| CORE Design | Ontario |
| Core Information Technologies Ltd | British Columbia |
| CORE IT Consultants | Ontario |
| Core Migration | Ontario |
| Core Network Solutions, Inc. | Alberta |
| Core One Labs, Inc. | British Columbia |
| CORE Resources | |
| Core State Holdings Corporation | |
| Core49 Software Design | Manitoba |