| Artisans Canada | Québec | Tout Commerces au détail |
| ASCO Valve Canada | Dorval | Tout Entreprises et services |
| ASG Canada | Montréal | Information Technologies (IT) |
| ASI Computer Technologies (Canada) Corp | 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 |
| 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 Centre Du Pneu Groupe Unik | Dorval | Tire Shop |
| Atelier De Daria Centro Canada | Montréal | Furniture Stores |
| ATEM Canada Inc | Montréal | Information Technologies (IT) |
| AtGen Canada | Laval | Life Sciences and Health Technologies (LSHT) |
| Atlas Copco Compressors Canada | Dollard Des Ormeaux | Life Sciences and Health Technologies (LSHT), Compressors |
| Auberge St-Louis | Dorval | Apartment Hotels |
| Audionova Inc. | Dorval | Tout Commerces au détail |
Publicité (Desktop) Publicité (Mobile) |
| Aust & Hachmann (Canada) Ltd | Pointe-Claire | Agri-food |
| Auticonsult Canada | Étage | Information Technologies (IT) |
| Auto Bugatti Inc. | Dorval | Tout Commerces au détail |
| 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 |
| Auto Rental Canada | Montréal | Auto Services |
| Auto Sai Inc | Dorval | Tire Shop |
| Automat Technologies | Montréal | Information Technologies (IT) |
Publicité (Desktop) Publicité (Mobile) |
| Automic Canada Logiciels | Montréal | Information Technologies (IT) |
| Avaya Canada Corp | Montréal | Information Technologies (IT) |
| 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) |
| AVIALL CANADA LIMITED | Boisbriand | Aerospace |
| Aviall Canada Ltd | Boisbriand | Aircraft Parts, Engines & Avionics |
| AVIATION MBBH Inc. | Dorval | Aerospace |
| Avis | Dorval | Tout Commerces au détail |
| Avison Young Canada | Centre-Ville | Tout Entreprises et services |
Publicité (Desktop) Publicité (Mobile) |
| Aviva Canada | Montréal | Car Insurance |
| Aviva Solutions Inc. | Dorval | Tout Informatique et internet |
| Avnet Canada Inc. | Montréal | Tout Entreprises et services |
| Avnet International (Canada) Ltd | Montréal | Information Technologies (IT) |
| Avon Canada Inc. | Pointe-Claire | Tout Commerces au détail |
| Azad Fine Chemicals | Dorval | Chemicals |
| Azelis canada | Boucherville | Chemicals |
| AÉRONAUTIQUE TMH CANADA INC. | Boisbriand | Aerospace |
| Aéroport International de Montréal-Trudeau YUL | Dorval | Airports |
| Aéroports de Montréal | Dorval | Airports |
