| SCN, Services Construction National inc. | 5669-0555-01 | Laval | Active |
| SCP3I inc. | 5833-7486-01 | Laval | Active |
| Sdmandas s.e.n.c. | 5733-9285-01 | Laval | Active |
| Sécuri-Toit inc. | 5591-7124-01 | Laval | Active |
| SÉCURITÉ AJ INC. | 5588-5875-01 | Laval | Active |
| Securite Safe-Tech Inc. | 3102-9747-04 | Laval | Active |
| Secutel inc. | 8276-0976-51 | Laval | Active |
| Sécutrol inc. | 2865-8458-38 | Laval | Active |
| SELK Design & Construction inc. | 5794-0603-01 | Laval | Active |
| Sergex Construction inc. | 5770-8349-01 | Laval | Active |
| Service & construction mobile ltée | 1469-9268-07 | Laval | Active |
| Service D'Entretien De Gymnases Laforest Inc. | 2850-1039-64 | Laval | Active |
| Service de gaz naturel Centre-Ville inc. | 8261-2193-52 | Laval | Active |
| Service De Mise Au Point Leblanc inc. | 1856-4849-02 | Laval | Active |
| Service de Nettoyage Impérial Inc. | 5693-1819-01 | Laval | Active |
| Service de Protection Incendie Canadien inc. | 5653-0652-01 | Laval | Active |
| Service de Réfrigération Nord-Sud inc. | 8221-6532-01 | Laval | Active |
| Service du bâtiment G.R. inc. | 5732-0913-01 | Laval | Active |
| Service E.T.R. inc. | 5705-4777-01 | Laval | Active |
| Service ÉlectriVen inc | 5754-0171-01 | Laval | Active |
| Service KMUS inc. | 5795-7730-01 | Laval | Active |
| Service Pro-Math Inc. | 8281-3296-46 | Laval | Active |
| Service Valeriu Stancu inc. | 5839-2739-01 | Laval | Active |
| Services de réfrigération R. & S. inc. | 1142-1807-77 | Laval | Active |
| Services de Rénovation Parabole inc. | 5585-5936-01 | Laval | Active |
| Services DMLS inc. | 5837-2194-01 | Laval | Active |
| Services Domiciliaires Nama s.e.n.c. | 5831-1143-01 | Laval | Active |
| Services Ecolux inc. | 5788-2466-01 | Laval | Active |
| Services Électriques Nourteck inc. | 5798-2035-01 | Laval | Restreinte |
| Services Ienic inc. | 5714-9775-01 | Laval | Active |
| Services J. Gagné inc. | 5831-5011-01 | Laval | Active |
| Services Peinture VIP inc. | 5678-2923-01 | Laval | Active |
| Services RMP inc. | 5845-7672-01 | Laval | Active |
| Services True Inc. | 5876-4903-01 | Laval | Active |
| Services-Pro VT Inc. | 5838-2490-01 | Laval | Active |
| SETCO inc. | 5729-7616-01 | Laval | Active |
| SEVERénovations Inc. | 5742-3592-01 | Laval | Active |
| SG Groupe Investisseur, inc. | 5796-3001-01 | Laval | Active |
| Si-Gem électrique inc. | 5848-5152-01 | Laval | Active |
| Sidak Services inc. | 5794-4068-01 | Laval | Active |
| Sierra Construction Inc. | 2632-9003-65 | Laval | Active |
| Signalisation Kalitec inc. | 8005-5767-29 | Laval | Active |
| Simémax inc. | 8323-7495-21 | Laval | Active |
| Sinisplus 2020 inc. | 5783-5704-01 | Laval | Active |
| SJL Électrique inc. | 5834-7915-01 | Laval | Active |
| SKLZ Construction inc. | 5803-6500-01 | Laval | Active |
| Skyway Canada Limited | 5659-6984-01 | Laval | Active |
| SL Aluminium inc. | 5605-6518-01 | Laval | Active |
| Société de transport de Laval | 8272-1655-04 | Laval | Active |
| Sol-Ter 2000 inc. | 5641-5128-01 | Laval | Active |