| Peregrine Security Pte. Ltd. | Island Wide | - | OE | SSS | Yishun |
| Regal Security & Fire Management Services Pte Ltd | Central | - | OE | SSS | Yishun |
| FormTeam Consultancy Pte Ltd | Island Wide | - | OE | SSS | Yishun |
| Prosegur Singapore Pte Ltd | Island Wide | - | OE | SS | Tampines |
| Crowne Plaza Changi Airport | East | In-House | OE | SO | Tampines |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | Island Wide | - | OE | SSS | Yishun |
| Force-One Security | North | Data Centre | OE | SO | Woodlands |
| Prosegur Singapore Pte Ltd | Island Wide | - | OE | SSS | Woodlands |
| PICO Guards Pte Ltd | Island Wide | - | OE | SS | - |
| Force-One Security | North | Data Centre | OE | SSO | Sengkang |
| Uniforce Security Services Pte Ltd | Island Wide | - | OE | CSO | Bedok |
| Trek Investigations & Security Management Services Pte Ltd | Island Wide | - | OE | CSO | Bedok |
| ProtectPlus Pte Ltd | Island Wide | - | OE | CSO | Bedok |
| Titanium Safety & Security Pte Ltd | Island Wide | - | OE | SS | Tampines |
| Inhouse Employer | Island Wide | - | OE | CSO | Marsiling |
| Securus Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| Trek Investigations & Security Management Services Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| PICO Guards Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| Union Security Services Pte. Ltd. | Island Wide | - | OE | CSO | Marsiling |
| Peregrine Security Pte. Ltd. | Island Wide | - | OE | CSO | Marsiling |
| G4S Secure Solutions (Singapore) Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| Regal Security & Fire Management Services Pte Ltd | Central | - | OE | CSO | Marsiling |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| ProtectPlus Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| SATS Ltd | East | - | OE | CSO | Marsiling |
