| Atek Canada | Montréal | Tout Informatique et internet |
| Atelier d'histoire de la Pointe-aux... | Montréal | Tout Enseignement et savoir, Tout Informations générales |
| Atelier De Daria Centro Canada | Montréal | Furniture Stores |
| Atelier De L'Auto Paolo & Dominic | Pointe-Aux-Trembles | Car Repair |
| ATEM Canada Inc | Montréal | Information Technologies (IT) |
| AtGen Canada | Laval | Life Sciences and Health Technologies (LSHT) |
| Athens P C Restaurant Pizzeria | Pointe-Claire | Pizza & Pizzerias |
| Atlas Copco Compressors Canada | Dollard Des Ormeaux | Life Sciences and Health Technologies (LSHT), Compressors |
| ATMA Classique | Pointe-Saint-Charles | Tout Arts et divertissement, Tout Entreprises et services |
| Attachmate | Pointe-Claire | Information Technologies (IT) |
Publicité (Desktop) Publicité (Mobile) |
| Aubin Ginette | Sainte-Claire | Real Estate Offices, Agence immobiliere |
| 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 Entretien 1000-Lift | Pointe-Aux-Trembles | Mecanique Auto |
| 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 |
| Auto123 | Pointe-Claire | Tout Commerces au détail |
Publicité (Desktop) Publicité (Mobile) |
| Automat Technologies | Montréal | Information Technologies (IT) |
| Automatisation Everest Inc | Pointe-Claire | Automation Systems & Equipment |
| Automic Canada Logiciels | Montréal | Information Technologies (IT) |
| Avalon Partners | Pointe-Claire | Business Brokers |
| Avaya Canada Corp | Montréal | Information Technologies (IT) |
| Avec Plaisirs | Pointe-Saint-Charles | Tout Entreprises et services |
| AVERNA TECHNOLOGIES INC. | Montréal | Aerospace |
| 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) |
Publicité (Desktop) Publicité (Mobile) |
| AVIALL CANADA LIMITED | Boisbriand | Aerospace |
| Aviall Canada Ltd | Boisbriand | Aircraft Parts, Engines & Avionics |
| AVIANOR | Mirabel | Aerospace |
| AVIATION MBBH Inc. | Dorval | Aerospace |
| AVIATRON INC. | Montréal | Aerospace |
| AVIOR INTEGRATED PRODUCTS INC. (LAVAL) | Laval | Aerospace |
| Avison Young Canada | Centre-Ville | Tout Entreprises et services |
| AVITEC (OUTILLAGES) INC. | Montréal | Aerospace |
| Aviva Canada | Montréal | Car Insurance |
| Avnet Canada Inc. | Montréal | Tout Entreprises et services |
Publicité (Desktop) Publicité (Mobile) |
| Avnet International (Canada) Ltd | Montréal | Information Technologies (IT) |
| Avon Canada Inc. | Pointe-Claire | Tout Commerces au détail |
| Axe Services Inc | Pointe-Aux-Trembles | Cleaning Services, Cleaning Service |
| Axiotech | Pointe-Aux-Trembles | Computer Repair & Cleaning |
| Azelis canada | Boucherville | Chemicals |
| AÉRO INNOVATION INC. | Saint-Mathieu-De-Beloeil | Aerospace |
| AÉRO TEKNIC INC. | Saint-Hubert | Aerospace |
| AÉRONAUTIQUE TMH CANADA INC. | Boisbriand | Aerospace |
| B Couture | Montréal | Couture, COUTURE |
| B G R Chemical Products Inc | Pointe-Claire | Chemicals |
