| Commerce Montex | Montréal | Computer Room Setup, Protection, Equipment & Maintenance |
| Commission des Services Electriques de Montréal | Montréal | Cable TV Providers |
| Commonwealth Plywood Co. Ltd. | Ste-Thérèse | Tout Entreprises et services |
| Communauto Inc. | Montréal | Clean Technologies |
| Communitec | Saint-Hubert | Cable Installation, Splicing & Detection |
| Compagnie Bicc General Cable | Saint-Jérôme | Cabling Equipment & Supplies |
| Compagnie de gestion Optilog inc. | Ste-Thérèse | Tout Entreprises et services |
| Compumatik | Montréal | Computer Repair & Cleaning |
| Computer sciences corporation | Montréal | Information Technologies (IT) |
| Computershare Trust Company of Canada | Montréal | Information Technologies (IT) |
Publicité (Desktop) Publicité (Mobile) |
| Conception Tekni-B | Brossard | Computer & Technology Assistance Programs |
| Connect IT Networks | Ste-Rose | Tout Entreprises et services |
| Connect&Go | Outremont | Computer Networking |
| Construction JLJ | Rosemère | Home Improvement |
| Construction Luxart | Rosemère | Home Improvement |
| Construction Max Larocque Inc. | Nouveau-Rosemont Et Mercier | Tout Entreprises et services |
| Construction René Voyer | Ste-Rose | Tout Entreprises et services |
| Construction Socam Ltée | Ste-Rose | Tout Entreprises et services |
| Construction Steeve Gagnon Inc | Montréal | Building Contractors |
| Construction Stéphane Proulx | Montréal | Home Improvement |
Publicité (Desktop) Publicité (Mobile) |
| Consulmac | Toronto | Computer Repair & Cleaning |
| CONSULTANTS AEROSYNC LTÉE | Rosemère | Aerospace |
| Continental | Rosemère | Beauty & Fitness, Hairdressers & Beauty Salons |
| Contours & Reliefs | Ste-Thérèse | Tout Entreprises et services |
| Convectair | Ste-Thérèse | Tout Entreprises et services |
| Coopsco Collège Rosemont | Petite-Patrie | Tout Commerces au détail, Tout Informatique et internet |
| Copiscope | Longueuil | Computer Accessories & Supplies |
| Corbeil Haute Pression | Varennes | Chemical & Steam Cleaning Systems |
| Corporation Stellar Canada Inc | Montréal | Call Centres |
| Corporation STERIS Canada | Montréal | Life Sciences and Health Technologies (LSHT) |
Publicité (Desktop) Publicité (Mobile) |
| Coulombe Jacques Ltée | Nouveau-Rosemont Et Mercier | Tout Entreprises et services |
| Coupon rabais | Ste-Rose | Tout Commerces au détail |
| Couvreur De Toitures Mont-Rose (Qué) Ltée | Montréal | Roofing |
| Couvreur Stéphane | Montréal | Roofing |
| CPE Pierrot La Lune, SiègeSocial,InstallationArlequin | Longueuil | Childcare Services |
| Creative Imaging | Montréal | Computer Graphics Design & Animation |
| Crossfit Rosemont | Montréal | Fitness Gyms |
| Crudessence | Ste-Rose | Tout Commerces au détail |
| CSD Construction | Nouveau-Rosemont Et Mercier | Tout Communautés et société |
| CSQ | Nouveau-Rosemont Et Mercier | Tout Communautés et société |
Publicité (Desktop) Publicité (Mobile) |
| CST Consultants | Montréal | Computer Consultants |
| Cuisines Steam Inc | Montréal | Kitchen Cabinets |
| Cyberlogic | Montréal | Computer Repair & Cleaning |
| Cyberlogic | Montréal | Computer Repair & Cleaning |
| Cylindres Starcyl Canada Inc. | Ste-Rose | Tout Entreprises et services |
| 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 |
