| Premier Security Co-operative Ltd | North | Commercial | SSO | SS | Yishun |
| Force-One Security | North | Data Centre | SS | SS | Woodlands South |
| SMS Investigation & Security Pte Ltd | North | Condominium | SSO | SS | Woodlands South |
| RAS Security Pte Ltd | North | Commercial | SSO | SS | Woodlands South |
| RAS Security Pte Ltd | North | Commercial | OE | SS | Woodlands South |
| Titanium Safety & Security Pte Ltd | North | In-House | OE | SS | Bukit Panjang |
| G4S Secure Solutions (Singapore) Pte Ltd | East | In-House | SSO | SS | Bukit Panjang |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SS | SS | Yishun |
| SMS Investigation & Security Pte Ltd | South | Commercial | SS | SS | Yishun |
| AGS Integration Pte. Ltd. | West | In-House | SS | SS | Yishun |
| PICO Guards Pte Ltd | North | Data Centre | SS | SS | Yishun |
| PICO Guards Pte Ltd | North | Industrial / Factory | SS | SS | Yishun |
| Union Security Services Pte. Ltd. | North | Commercial | SS | SS | Yishun |
| Union Security Services Pte. Ltd. | East | Data Centre | SS | SS | Yishun |
| Titanium Safety & Security Pte Ltd | North | In-House | OE | SS | Yishun |
| Guthrie FMC Security Pte Ltd | Island Wide | - | OE | SS | Yishun |
| Security Masters Pte Ltd | Central | Data Centre | SS | SS | Yishun |
| RAS Security Pte Ltd | East | Commercial | SS | SS | Yishun |
| William Secure Solutions Pte Ltd | South | Commercial | SS | SS | Yishun |
| Force-One Security | North | Data Centre | SS | SS | Yishun |
| Force-One Security | North | Data Centre | OE | SS | Yishun |
| Acestes Pte Ltd | Island Wide | - | OM | SS | Bukit Panjang |
| Securus Pte Ltd | Island Wide | - | OE | SS | Yishun |
| Fervour Pte Ltd | Island Wide | - | OM | SS | Bukit Panjang |
| SMS Investigation & Security Pte Ltd | Central | - | OM | SS | Bukit Panjang |
