| York Hotel (Private) Limited | Central | In-House | OM | SS | Woodlands |
| SMS Investigation & Security Pte Ltd | Central | - | OM | SS | Woodlands |
| GoMobile Security Solutions Pte Ltd | Island Wide | - | OM | SS | Woodlands |
| Star Security Services | Island Wide | - | Security Mgt | SS | Woodlands |
| Union Security Services Pte. Ltd. | Island Wide | - | OE | SS | Woodlands |
| Peregrine Security Pte. Ltd. | Island Wide | - | OE | SS | Woodlands |
| Metropolis Security Systems Pte Ltd | Central | Condominium | SS | SS | Jurong East |
| Security & Risk Solutions Pte. Ltd. | Central | In-House | RSOC/CAMS Op | SS | Jurong East |
| Force-One Security | North | Data Centre | SS | SS | Jurong East |
| Securus Pte Ltd | Island Wide | - | OE | SS | Ang Mo Kio |
| Ascentiaa Security Management Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| Star Security Services | Island Wide | - | OE | SS | Woodlands |
| Mainguard Security Services (S) Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| 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 |
| Legion Protection Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| Metropolis Security Systems Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | Island Wide | - | OE | SS | Woodlands |
