| ASG Canada | Montréal | Information Technologies (IT) |
| ASI Computer Technologies (Canada) Corp | Montréal | Information Technologies (IT) |
| Aspler Joseph Jutras Inc | Westmount | Car Insurance |
| Asplundh Canada | Terrebonne | Life Sciences and Health Technologies (LSHT) |
| Assemblée Quaker de Montréal | Westmount | Tout Communautés et société |
| Assetco Recovery Services Inc | Mont-Royal | Business Valuation |
| Assima Canada / Wizart Canada | Montréal | Information Technologies (IT) |
| Association des Médecins omnipratic... | Westmount | Tout Communautés et société |
| Association des scouts du Canada | Villeray | Tout Arts et divertissement, Tout Communautés et société |
| Association des Éditeurs de Langue... | Westmount | Tout Entreprises et services |
Publicité (Desktop) Publicité (Mobile) |
| Association Sociale Inca Canada | Montréal | Associations |
| Assurance Pierre & Baguidy | Montréal | Business Insurance |
| Assurance vie Primerica services financiers | Saint-Léonard | Business Insurance |
| Assurances Laurino & Gutta Inc | Montréal | Business Insurance |
| Assurances Provencher Verreault | Brossard | Business Insurance |
| Assurancia Guertin & Cie | Saint-Basile-Le-Grand | Business Insurance |
| Assurexperts Boisselle Et Associés | Varennes | Business Insurance |
| Assurexperts Desgroseilliers inc | Saint-Hubert | Business Insurance |
| ASSYSTEM PRODUCT ENGINEERING CANADA | Montréal | Aerospace |
| AstraZeneca Canada | Longueuil | Life Sciences and Health Technologies (LSHT) |
Publicité (Desktop) Publicité (Mobile) |
| AT&T Canada | Centre-Ville | Tout Entreprises et services |
| ATD DESIGN SERVICES (4071468 CANADA INC.) | Sainte-Geneviève | Aerospace |
| Atek Canada | Montréal | Tout Informatique et internet |
| Atelier Blow | Westmount | Beauty & Fitness, Hairdressers & Beauty Salons |
| Atelier De Daria Centro Canada | Montréal | Furniture Stores |
| Atelier de Serrures Martin's Swiss | Westmount | Bicycle Stores |
| Atelier Scissor House | Westmount | Beauty & Fitness, Hairdressers & Beauty Salons |
| ATEM Canada Inc | Montréal | Information Technologies (IT) |
| Atex Inc | Montréal | Business Forms & Systems |
| AtGen Canada | Laval | Life Sciences and Health Technologies (LSHT) |
Publicité (Desktop) Publicité (Mobile) |
| Atlas Copco Compressors Canada | Dollard Des Ormeaux | Life Sciences and Health Technologies (LSHT), Compressors |
| Atome Distributeur Inc | Brossard | Business Forms & Systems |
| Atrium Innovations Inc. | Westmount | Agri-food |
| Aubé Avocats | Saint-Constant | Business Lawyers |
| Aust & Hachmann (Canada) Ltd | Pointe-Claire | Agri-food |
| Auticonsult Canada | Étage | Information Technologies (IT) |
| Auto Diesel 119483 Canada Inc | Laval | Auto Part Manufacturers & Wholesalers |
| Auto Hall Canada | Montréal | Car Repair |
| Auto Hall Canada Pie IX Inc | Montréal | Automobiles, car Dealers |
| Auto Laser Canada | Montréal | Automobiles, car Dealers |
Publicité (Desktop) Publicité (Mobile) |
| Auto Rental Canada | Montréal | Auto Services |
| Automat Technologies | Montréal | Information Technologies (IT) |
| Automic Canada Logiciels | Montréal | Information Technologies (IT) |
| Avalon Partners | Pointe-Claire | Business Brokers |
| Avataq Institut Culturel | Westmount | Arts & Cultural Organizations & Centres |
| Avaya Canada Corp | Montréal | Information Technologies (IT) |
| Avenue Des Arts | Westmount | Art Materials & Supplies |
| Avery Dennison Fasson Canada Inc. | Vaudreuil-Dorion | Tout Entreprises et services |
| Avery Weigh-Tronix Canada | Pointe-Claire | Tout Entreprises et services |
| AVI-SPL Canada Ltd | Montréal | Information Technologies (IT) |
