| William Secure Solutions Pte Ltd | Central | Condominium | SS | SS | Hougang |
| AGS Integration Pte. Ltd. | West | In-House | SS | SS | Hougang |
| York Hotel (Private) Limited | Central | In-House | SS | SS | Sengkang |
| Union Security Services Pte. Ltd. | East | Data Centre | SS | SSO | Jurong East |
| 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 | Island Wide | Commercial | SS | SS | Yishun |
| PICO Guards Pte Ltd | North | Data Centre | SS | SS | Yishun |
| Triple ‘S’ Protection Pte Ltd | West | Commercial | SS | SS | Yishun |
| AGS Integration Pte. Ltd. | West | In-House | SS | SSO | Bukit Batok |
| Soverus Pte Ltd | South | In-House | SS | SSO | Bukit Batok |
| Metropolis Security Systems Pte Ltd | Central | Condominium | SS | SS | Jurong East |
| Force-One Security | North | Data Centre | SS | SS | Jurong East |
| Premier Security Co-operative Ltd | Island Wide | - | SS | SS | Jurong East |
| Force-One Security | North | Data Centre | SS | SS | Jurong East |
| G4S Secure Solutions (Singapore) Pte Ltd | West | Industrial / Factory | SS | SS | Jurong East |
| Reachfield Security & Safety Management Pte Ltd | Island Wide | Commercial | SS | SS | Yishun |
| Ranger Investigation & Security Services Pte Ltd | Island Wide | In-House | SS | SS | Yishun |
| Mainguard Security Services (S) Pte Ltd | West | - | SS | SS | - |
| Soverus Pte Ltd | South | Commercial | SS | SS | - |
| Bulls-Eye Security Services Pte Ltd | Central | Commercial | SS | SS | Woodlands |
| Elitez Security Pte Ltd | Central | Condominium | SS | SS | Woodlands |
| Inhouse Employer | Central | Hotel | SS | SS | Marsiling |
| Union Security Services Pte. Ltd. | East | Data Centre | SS | SSO | Jurong East |
| SMS Investigation & Security Pte Ltd | Central | Condominium | SS | SS | Hougang |
