| Carrefour Québec International | |
| Carrus Technologies | Quebec |
| Carson Shold | Ontario |
| CarsonBiz.com | Manitoba |
| Cartagena Software Ltd | Ontario |
| CARTaGENE | |
| Carte Blanche Creative | Ontario |
| Cartel Communication System, Inc. | British Columbia |
| Cartel Communication Systems, Inc. | |
| Cartel, Inc. | |
| CarteNav | Nova Scotia |
| CartExcel | Ontario |
| Cartier Informatique | Quebec |
| Cartika | |
| Carto World | British Columbia |
| Cartouche Extra | Quebec |
| Cartouche Impression & Cie | |
| Cartouches certifiées | Quebec |
| Cartouches-Escompte | Quebec |
| CartoVista, Inc. | Quebec |
| Cartridge City | Ontario |
| CartridgeStore | Ontario |
| Carver Software Solutions | |
| Casanna Multimedia | Alberta |
| Cascadia Blockchain Group | British Columbia |
| CasCom | Northwest Territories |
| Case Lab | Ontario |
| Caseo | Ontario |
| CaseWare International, Inc. | Ontario |
| Cash N Go | Alberta |
| Cashew Research | |
| Cashin Studios | Quebec |
| CASP Aerospace, Inc. | Quebec |
| Caspiana Studios | |
| Cassa Office Plus | |
| Cast Group of Companies, Inc. | Ontario |
| Castalia Software | Nova Scotia |
| Castech Data Services, Inc. | Ontario |
| Castellan Information Security Services, Inc. | |
| Castle Hall Diligence | |
| Castlebreck, Inc. | Ontario |
| CastleCS | British Columbia |
| Castonguay Électronique | Quebec |
| Castor Optics, Inc. | Quebec |
| Castr Live Streaming, Inc. | |
| Casyna | Quebec |
| Cat's Eye Technologies | British Columbia |
| Cat-Comm, Inc. | Quebec |
| Catalis | |
| Catalyseur en technologie de la santé | Quebec |