| Alpha DNA | Stn D | Life Sciences and Health Technologies (LSHT), Tout Entreprises et services |
| Alpha Logistiques | Montréal | Tout Entreprises et services |
| Alpha Natura | Montréal | Physiotherapy |
| Alpha Toronto Series Inc | Saint-Léonard | Accountants |
| Alphacasting Inc. | Montréal | Aerospace, Tout Entreprises et services |
| Alpharegul | Boucherville | Tout Entreprises et services |
| Alphi Apparel Group | Montréal | Tout Entreprises et services |
| Alsago Entrepreneurs | Montréal | Startup Ecosystem |
| Alset Cars | Montréal | Automobiles, car Dealers |
| Altamed Pharma | Montréal | Life Sciences and Health Technologies (LSHT) |
Publicité (Desktop) Publicité (Mobile) |
| Altano Inc | Cote Saint-Luc | Home Improvement |
| Altasciences | Laval-Des-Rapides | Tout Entreprises et services |
| Altasciences (Algorithme Pharma Inc.) | Montréal | Life Sciences and Health Technologies (LSHT) |
| Alter Action | Laval | Physiotherapy |
| Alternateur Démarreur Roussillon Enr | Sainte-Catherine | Alternators & Starters |
| Alternateurs Et Demarreurs Express Net | Saint-Hubert | Alternators & Starters |
| Alternateurs et Démarreurs | Saint-Amable | Alternators & Starters |
| Altitude Aerospace Inc | Montréal | Aircraft Maintenance, Service & Storage |
| Altitude Aerospace Inc | Montréal | Aircraft Maintenance, Service & Storage |
| Alumalco | Montréal | Home Improvement |
Publicité (Desktop) Publicité (Mobile) |
| Alumicor Limited | Montréal | Aluminum, Aluminum Products, Architects |
| Alumina | Saint-Léonard | Aluminum |
| Aluminium D Gravel Inc | Saint-Hubert | Aluminum |
| Aluminium St-Hubert | Saint-Hubert | Aluminum |
| Aluminox Spec Inc | Saint-Hubert | Aluminum |
| Aluron Biopharma | Montréal | Life Sciences and Health Technologies (LSHT) |
| Alyn Simard Audioprothésistes | Saint-Bruno | Audiologists |
| Amadea S. Kezar Physiothérapie | Westmount | Physiotherapy |
| Amarie-Josée Rompré Photographe | Montréal | Tout Commerces au détail |
| Amarille | Saint-Bruno | Tout Commerces au détail |
Publicité (Desktop) Publicité (Mobile) |
| Amaris Conseil Inc | Montréal | Information Technologies (IT) |
| Amaro Magasin St-Léonard | Saint-Léonard | Bulk & Bottled Water |
| Ambiance Luminaire | Saint-Léonard | Electricians |
| AMCS | Saint-Léonard | Cleaning Services, Cleaning Service |
| Ameli Artistry | Saint-Lambert | Beauty & Fitness, Hairdressers & Beauty Salons |
| Amerella du Canada Ltée | Montréal | Tout Entreprises et services |
| Ameublement Lida | Saint-Léonard | Tout Commerces au détail |
| Ameublement Lida Furniture Inc | Saint-Léonard | Beds |
| Ami Pizzeria | Saint-Hubert | Pizza & Pizzerias |
| Ami-Co Inc | Saint-Hubert | Beauty Salon Equipment & Supplies |
Publicité (Desktop) Publicité (Mobile) |
| Amiens Salle de Réception | Saint-Léonard | Auditoriums & Halls |
| Amirco Electrique | Montréal | Electricians |
| Amircoelectrique | Montréal | Electricians |
| Amis du boulevard Saint-Laurent | Montréal | Tout Informations générales |
| Amissa Clinic Massage Therapist | Saint-Léonard | Massage Therapy |
| AMP Réfrigération | Saint-Jean | Air Conditioning Contractors |
| AMPHENOL AIR LB NORTH AMERICA INC. | Saint-Hubert | Aerospace |
| Amplia Pharmatek | Montréal | Life Sciences and Health Technologies (LSHT) |
| AMS Physiotherapy & Rehabilitation Centre | Dorval | Physiotherapy |
| Amstik Inc. | Riviere-Des-Prairies | Tout Entreprises et services |
