| Trek Investigations & Security Management Services Pte Ltd | Central | Commercial | SO | SO | Punggol |
| Elitez Security Pte Ltd | East | Condominium | SO | SO | Punggol |
| Prospect Protection Pte Ltd | East | Industrial / Factory | SO | SO | Punggol |
| Reachfield Security & Safety Management Pte Ltd | Central | Commercial | SO | SO | Punggol |
| GATES PCM Integrated Services Pte Ltd | Central | School | SO | SO | Punggol |
| Premier Security Co-operative Ltd | East | Commercial | SO | SO | Punggol |
| Force-One Security | East | Industrial / Factory | SO | SO | Punggol |
| G4S Secure Solutions (Singapore) Pte Ltd | Central | School | SO | SO | Punggol |
| GATES PCM Integrated Services Pte Ltd | Central | School | SO | SO | Punggol |
| Reachfield Security & Safety Management Pte Ltd | East | School | SO | SO | Punggol |
| Certis Group | Central | Commercial | SO | SO | Bukit Batok |
| Inhouse Employer | North | In-House | SO | CSO | Yishun |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Retail | SO | SO | - |
| G4S Secure Solutions (Singapore) Pte Ltd | South | - | SO | SO | - |
| G4S Secure Solutions (Singapore) Pte Ltd | West | Commercial | SO | SO | - |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Retail | SO | SS | Pioneer |
| Straits Retail Property Management Services Pte. Ltd. | Central | In-House | SO | SS | Pioneer |
| Securus Pte Ltd | Island Wide | Commercial | SO | SO | Tampines |
| H World Holdings Singapore Pte. Ltd. | Central | In-House | SO | CSO | Yishun |
| TwinRock Global | Central | - | SO | CSO | Yishun |
| Inhouse Employer | East | In-House | SO | CSO | Yishun |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Retail | SO | SO | - |
| Securus Pte Ltd | Island Wide | Commercial | SO | SO | Tampines |
| Certis Group | Central | Commercial | SO | SO | Bukit Batok |
| Aigle Security Pte Ltd | Central | Retail | SO | SS | Pioneer |
