| Architech Solutions Bâtiments | Laval | Architects |
| ARCHIVES IRON MOUNTAIN | Lachine | Information Technologies (IT) |
| Arctic Traveler Canada Ltd | Montréal | Garage Auto |
| Arianne Relocation Canada | Ville-Émard Et Côte-Saint-Paul | Tout Entreprises et services |
| Arlee Canada Inc | Montréal | Bedding & Linens |
| Arneg Canada Inc. | Lacolle | Tout Commerces au détail |
| Around the word | Montréal | Information Technologies (IT) |
| Arrow Électronique Canada | Baie-D'urfé | Information Technologies (IT) |
| Arslan Automotive Canada Ltée | Pointe-Claire | Tout Commerces au détail |
| Artech Camps Canada | Montréal | Camps |
Publicité (Desktop) Publicité (Mobile) |
| Artelys Canada | Montréal | Information Technologies (IT) |
| Artemano Canada | Laval | Furniture Stores |
| Artemano Canada | Laval | Furniture Stores |
| Article 19 Group | Montréal | Information Technologies (IT) |
| Artifact5 | Montréal | Information Technologies (IT) |
| Artifex Animation Studios | Montréal | Information Technologies (IT) |
| Artifice Studio | Longueuil | Information Technologies (IT) |
| Artisans Canada | Québec | Tout Commerces au détail |
| ASCO Valve Canada | Dorval | Tout Entreprises et services |
| ASG Canada | Montréal | Information Technologies (IT) |
Publicité (Desktop) Publicité (Mobile) |
| ASI Computer Technologies (Canada) Corp | Montréal | Information Technologies (IT) |
| Aspido Inc | Montréal | Information Technologies (IT) |
| Asplundh Canada | Terrebonne | Life Sciences and Health Technologies (LSHT) |
| Assima Canada / Wizart Canada | Montréal | Information Technologies (IT) |
| Association des scouts du Canada | Villeray | Tout Arts et divertissement, Tout Communautés et société |
| Association Sociale Inca Canada | Montréal | Associations |
| ASSYSTEM PRODUCT ENGINEERING CANADA | Montréal | Aerospace |
| AST Clinical solutions | Laval | Life Sciences and Health Technologies (LSHT) |
| AST Clinical solutions | Albert-Einstein | Life Sciences and Health Technologies (LSHT) |
| Astek Québec Inc | Montréal | Information Technologies (IT) |
Publicité (Desktop) Publicité (Mobile) |
| AstraZeneca Canada | Longueuil | Life Sciences and Health Technologies (LSHT) |
| 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 De Daria Centro Canada | Montréal | Furniture Stores |
| ATEM Canada Inc | Montréal | Information Technologies (IT) |
| AtGen Canada | Laval | Life Sciences and Health Technologies (LSHT) |
| Athanassios Natsikas – SOLUTIONS COMPTABLE MTL, | Chomedey | Professionals |
| Atlants Embedded | Montréal | Information Technologies (IT) |
| Atlas Copco Compressors Canada | Dollard Des Ormeaux | Life Sciences and Health Technologies (LSHT), Compressors |
Publicité (Desktop) Publicité (Mobile) |
| Atomic Fiction | Montréal | Information Technologies (IT) |
| Attachmate | Pointe-Claire | Information Technologies (IT) |
| Audio Postproduction SPR Inc. | Montréal | Information Technologies (IT) |
| Audiokinetic | Montréal | Information Technologies (IT) |
| 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 |
