| 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 |
| AETOS Holdings Pte Ltd | West | - | SO | SS | Marsiling |
| Inhouse Employer | Central | Hotel | SS | SS | Marsiling |
| Union Security Services Pte. Ltd. | Island Wide | - | OE | SS | Woodlands |
| ProtectPlus Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| Mainguard Security Services (S) Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| Trek Investigations & Security Management Services Pte Ltd | Island Wide | - | OE | SS | Sengkang |
| Acestes Pte Ltd | Central | - | Security Mgt | SS | Sengkang |
| ProtectPlus Pte Ltd | Island Wide | - | OE | SS | Hougang |
| SMS Investigation & Security Pte Ltd | Central | Condominium | SS | SS | Hougang |
| AGS Integration Pte. Ltd. | West | In-House | SS | SS | Hougang |
| William Secure Solutions Pte Ltd | South | Condominium | SS | SS | Hougang |
| Crowne Plaza Changi Airport | East | In-House | OE | SS | Hougang |
| Titanium Safety & Security Pte Ltd | North | In-House | OE | SS | Hougang |
| Royal Security Management Services Pte Ltd | Island Wide | - | OE | SS | Hougang |
