| Acme Vacuum Cleaner Co Ltd | Montréal | Cleaning Services, Cleaning Service |
| Acme Vacuum Compagnie Ltée | Montréal | Tout Entreprises et services |
| ACN Canada | Montréal | Information Technologies (IT) |
| Acousti-Tech | Saint-Lambert | Tout Entreprises et services |
| ACP Docteur Revêtement | Montréal | Painters |
| Acquisio | Brossard | Information Technologies (IT), Tout Informatique et internet |
| Acquisition Podform 3d inc. | Montréal | Life Sciences and Health Technologies (LSHT) |
| ACRoyal | Saint-Léonard | Tout Entreprises et services |
| Acs Nai Ltd | Montréal | Aviation Consultants & Services |
| ACSYNAM | Montréal | Life Sciences and Health Technologies (LSHT) |
Publicité (Desktop) Publicité (Mobile) |
| Actelion | Laval | Life Sciences and Health Technologies (LSHT) |
| Action Dignité De St-Léonard | Saint-Léonard | Associations |
| Action Raymond | Saint-Hubert | Appliance Repair & Service |
| Action Raymond Inc | Saint-Hubert | Appliance Repair & Service |
| Action-Gardien | Pointe-Saint-Charles | Tout Informations générales |
| Actionetworks | Montréal | Communications & Public Relations Consultants |
| Actuelle Chaussures | Saint-Lambert | Boots |
| Actumus | Cherrier | Life Sciences and Health Technologies (LSHT) |
| Acupuncteure Certifiée Céline Hamelin | Saint-Hubert | Acupuncturists |
| Acupuncteure Claudine Dufour | Saint-Bruno | Acupuncturists |
Publicité (Desktop) Publicité (Mobile) |
| Acupuncture Diane Gingras | Saint-Bruno | Acupuncturists |
| Acupuncture Emmanuelle Rioux | Saint-Lambert | Acupuncturists |
| Acupuncture Emmanuelle Rioux | Saint-Lambert | Clinics |
| Acupuncture Saint-Bruno | Saint-Bruno | Acupuncturists |
| Acupuncture St-Bruno Gingras Labarre | Saint-Bruno-De-Montarville | Acupuncturists |
| Acupuncture St-Hubert | Saint-Hubert | Acupuncturists |
| AD 3R Technologies Inc. | Longueuil | Tout Entreprises et services |
| Adag Consultants Inc | Montréal | Home Improvement |
| Adalia Services Préventifs Ltée | Saint-Léonard | Tout Commerces au détail |
| Adam Ant - Montreal | Montréal | Tout Informations générales |
Publicité (Desktop) Publicité (Mobile) |
| Adam Sofineti | Montréal | Tout Informatique et internet |
| Adanac Inc | Saint-Léonard | Garage Auto |
| Adare Pharmatech Canada | Mont-Saint-Hilaire | Life Sciences and Health Technologies (LSHT) |
| ADD CANADA COMPANY | Pointe-Claire | Information Technologies (IT) |
| Adele Gawhary | Saint-Hubert | Beauty & Fitness, Hairdressers & Beauty Salons |
| Adfast Corporation | Montréal | Tout Entreprises et services |
| AdGear Technologies Inc. | Montréal | Information Technologies (IT) |
| Adglobe | Montréal | Information Technologies (IT) |
| Adhésifs Adchem Inc | Montréal | Caulking Materials & Equipment |
| ADI | Montréal | Information Technologies (IT) |
Publicité (Desktop) Publicité (Mobile) |
| ADI Electrique - Électricien Commercial et Industriel Saint-Laurent | Montréal | Electricians |
| Adiantum Production (anciennement Laboratoires Capsulab Inc.) | Dollard | Life Sciences and Health Technologies (LSHT) |
| Adieu bazou | Saint-Jérôme | Tout Communautés et société, Tout Informations générales |
| ADP Canada R-L | Montréal | Information Technologies (IT) |
| ADP Dealer Services | Boucherville | Information Technologies (IT) |
| Adpb Réno 9318-2509 Québec Inc | Saint-Hubert | Painters |
| Adrenalys | Montréal | Startup Ecosystem |
| ADT Canada | Montréal | Information Technologies (IT) |
| ADT Security Services | Saint-Léonard | Aircraft Parts, Engines & Avionics |
| Adtran Canada | Montréal | Information Technologies (IT) |
