| Malco Solution de recharge inc. | 5826-5380-01 | Laval | Active |
| Mancini Construction Inc. | 8115-6416-07 | Laval | Active |
| Mannetta Industries Inc. | 5689-7879-01 | Laval | Active |
| Manufacturier Sheltec inc. | 8334-6106-44 | Laval | Active |
| Maquette Construction inc. | 5797-4669-01 | Laval | Active |
| Maranda-Lauzon inc. | 5873-7404-01 | Laval | Active |
| Marc Bertrand inc. | 5648-3548-01 | Laval | Active |
| Marchand entrepreneur électricien ltée | 2167-7125-04 | Laval | Active |
| Marcotte Design Inc. | 8356-9715-01 | Laval | Active |
| Marteau et Fils inc. | 5761-6179-01 | Laval | Active |
| Masecchia Aluminium inc. | 5591-9534-01 | Laval | Active |
| Mass. Electric Construction Canada Co. | 5743-8368-01 | Laval | Active |
| Mat électrique inc. | 5680-9676-01 | Laval | Active |
| Mathstruction inc. | 5621-3853-01 | Laval | Active |
| Maurice Denis et fils inc. | 8234-7022-39 | Laval | Active |
| Mavacon Inc. | 8349-4906-26 | Laval | Active |
| MAYA ÉLECTRIQUE INC. | 5808-9608-01 | Laval | Active |
| MDGP Entrepreneur Général inc. | 5604-5131-01 | Laval | Active |
| MEC Calfeutrage inc. | 5705-1989-01 | Laval | Active |
| Mécanique RH 2003 ltée | 8301-7475-36 | Laval | Active |
| Medical Tronik MTL Ltee | 5627-1166-01 | Laval | Active |
| Mel-Co Paysagiste | 5853-7622-01 | Laval | Active |
| Men électrique inc. | 8346-2911-41 | Laval | Active |
| Menuiserie B inc. | 5794-9364-01 | Laval | Active |
| Menuiserie Martin Simard inc. | 8250-9878-09 | Laval | Active |
| Menuiserie Paul Robin inc. | 8350-3961-16 | Laval | Active |
| Métabo Construction inc. | 8280-9658-34 | Laval | Active |
| Metra Aluminium Inc. | 8250-1032-15 | Laval | Active |
| Meubles Création Julie-Pierre inc. | 8336-3275-10 | Laval | Active |
| MF Electrique inc. | 5742-2875-01 | Laval | Active |
| MGB Associés Inc. | 8002-5059-19 | Laval | Active |
| MGBastien Rénovation inc. | 5707-8073-01 | Laval | Active |
| MGT Construction inc. | 8313-1045-52 | Laval | Active |
| MHQConstruction s.e.n.c. | 5789-9734-01 | Laval | Active |
| Michel B. Isolation Inc. | 1844-0628-72 | Laval | Active |
| Michel Bellerive Excavation Inc. | 2426-2230-69 | Laval | Active |
| Michel Huppé électrique inc. | 5628-4029-01 | Laval | Active |
| Migo Électrique inc. | 5767-2537-01 | Laval | Active |
| Miguel Constructions et Rénovations inc. | 8350-2591-59 | Laval | Active |
| Mike Réno Express inc. | 5716-4907-01 | Laval | Active |
| Milanco groupe inc. | 8334-7559-15 | Laval | Active |
| Milanco inc. | 5587-3814-01 | Laval | Active |
| Millenium Construction Du Canada inc | 5874-9581-01 | Laval | Active |
| Millenium Électrique Inc. | 5729-5586-01 | Laval | Active |
| Mir portes de garage inc. | 5654-9918-01 | Laval | Active |
| Mira Construction Rénovation Inc. | 5871-5004-01 | Laval | Active |
| Mirador Technologie inc. | 5865-8451-01 | Laval | Active |
| Mistral ventilation inc. | 8105-0379-22 | Laval | Active |
| MO. Automation Inc. | 5855-5319-01 | Laval | Active |
| MOE inc. | 5847-9825-01 | Laval | Active |