| Cna | Montréal | Computer Consultants |
| Cocoapp | Montréal | Computer Consultants |
| Cogeco Cable | Montréal | Cable TV Providers |
| Cogeco Cable Quebec S E N C | Montréal | Cable TV Providers |
| cogeco Connexion Epon-Nicolas Samson Np | Trois-Rivières | np |
| Cogeco Inc | Marie | Cable TV Providers |
| Cogeco Inc Siège Social | Montréal | Cable TV Providers |
| Cogeco Peer 1 - Montreal (downtown) | Montréal | Information Technologies (IT) |
| Cogeco Peer 1 - Montreal (Kirkland) | Kirkland | Information Technologies (IT) |
| Cogia | Montréal | Computer Consultants |
Publicité (Desktop) Publicité (Mobile) |
| Coin Solutions Affaires | Saint-Léonard | Bookkeeping Software & Accounting Systems |
| Combustible | Montréal | Computer Networking |
| Commerce Montex | Montréal | Computer Room Setup, Protection, Equipment & Maintenance |
| Commission des Services Electriques de Montréal | Montréal | Cable TV Providers |
| Communitec | Saint-Hubert | Cable Installation, Splicing & Detection |
| Compagnie Bicc General Cable | Saint-Jérôme | Cabling Equipment & Supplies |
| Compta Solutions | Montréal | Chartered Professional Accountants (CPA) |
| Comptabilite Solutions | Montréal | Bookkeeping Software & Accounting Systems |
| Compumatik | Montréal | Computer Repair & Cleaning |
| Computer sciences corporation | Montréal | Information Technologies (IT) |
Publicité (Desktop) Publicité (Mobile) |
| Computershare Trust Company of Canada | Montréal | Information Technologies (IT) |
| Conception Tekni-B | Brossard | Computer & Technology Assistance Programs |
| Connect&Go | Outremont | Computer Networking |
| Consulmac | Toronto | Computer Repair & Cleaning |
| Copiscope | Longueuil | Computer Accessories & Supplies |
| Corporate Promotion Solutions | Montréal | Calendars |
| CPE Pierrot La Lune, SiègeSocial,InstallationArlequin | Longueuil | Childcare Services |
| Creative Imaging | Montréal | Computer Graphics Design & Animation |
| CST Consultants | Montréal | Computer Consultants |
| Curotic Solutions Inc. | Claudel | Life Sciences and Health Technologies (LSHT) |
Publicité (Desktop) Publicité (Mobile) |
| Cyberlogic | Montréal | Computer Repair & Cleaning |
| Cyberlogic | Montréal | Computer Repair & Cleaning |
| Câblage Dynamique Inc | Montréal | Cable TV Providers |
| Câblage Expert | Sainte-Rose | Cabling Equipment & Supplies |
| Câblage FB Enrg | Auteuil | Cabling Equipment & Supplies |
| Câblage Filotech | Pointe-Aux-Trembles | Cabling Equipment & Supplies |
| Câblages Syl-Tech | Sainte-Catherine | Cabling Equipment & Supplies |
| Câble & Son | Ste-Rose | Tout Commerces au détail |
| Câble & Son Télécom Ltée | Greenfield Park | Answering Machines & Equipment |
| D&M Solutions Comptables Inc | Saint-Léonard | Accounting Services |
Publicité (Desktop) Publicité (Mobile) |
| Darwin Dimensions Inc | Montréal | Computer Graphics Design & Animation |
| Data Donnees | Montréal | Computer Data Recovery |
| Datrox Computer Technologies Inc. | Montréal | Tout Informatique et internet |
| Dauphin Technologie | Laval | Computer Data Processing |
| Dauphin Technologie Quebec | Laval | Computer Data Processing |
| Dealer Live Inc | Longueuil | Computer Networking |
| Decision One | Montréal | Computer Data Processing |
| DELAN - Solutions de Talents TI | Montréal | Tout Entreprises et services |
| Dempton Solutions Technologiques Inc | Montréal | Computer Consultants |
| Dermatologie Skin and Hair Solutions | Montréal | Health and Beauty |
