| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SSO | SSO | Woodlands |
| Reachfield Security & Safety Management Pte Ltd | Island Wide | Commercial | SS | SS | Lakeside |
| Trek Investigations & Security Management Services Pte Ltd | Central | Commercial | SO | SO | Punggol |
| Reachfield Security & Safety Management Pte Ltd | Central | Commercial | SO | SO | Punggol |
| Premier Security Co-operative Ltd | East | Commercial | SO | SO | Punggol |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SSO | SO | Bukit Batok |
| Certis Group | Central | Commercial | SO | SO | Bukit Batok |
| G4S Secure Solutions (Singapore) Pte Ltd | West | Commercial | SO | SO | - |
| Reachfield Security & Safety Management Pte Ltd | South | Commercial | SS | SS | Pioneer |
| Securus Pte Ltd | Island Wide | Commercial | SO | SO | Tampines |
| A-SAT Pte Ltd | North | Commercial | SSO | SSO | Yishun |
| Triple ‘S’ Protection Pte Ltd | West | Commercial | SSO | SSO | Bukit Batok |
| Securus Pte Ltd | Island Wide | Commercial | SO | SO | Tampines |
| RAS Security Pte Ltd | North | Commercial | SSO | SO | Bukit Batok |
| Certis Group | Central | Commercial | SO | SO | Bukit Batok |
| Reachfield Security & Safety Management Pte Ltd | North | Commercial | SO | SO | - |
| Global Ritz Protection (Security Services) Pte Ltd | North | Commercial | SO | SO | - |
| Resorts World Sentosa | South | Commercial | SO | SO | - |
| GWC Commercial Pte. Ltd. | Central | Commercial | SO | SSO | - |
| GWC Commercial Pte. Ltd. | Central | Commercial | SO | SSO | - |
| G4S Secure Solutions (Singapore) Pte Ltd | West | Commercial | SS | SSO | Jurong East |
| Reachfield Security & Safety Management Pte Ltd | West | Commercial | SS | SSO | Jurong East |
| Reachfield Security & Safety Management Pte Ltd | West | Commercial | SO | SO | - |
| Uniforce Security Services Pte Ltd | East | Commercial | SO | SO | Punggol |
| Aigle Security Pte Ltd | Central | Commercial | SO | SO | Punggol |
