| Union Security Services Pte. Ltd. | Island Wide | - | SSO | SO | Bukit Batok |
| Total Protection Solutions Pte Ltd | North | - | SSO | SO | Bukit Batok |
| SMS Investigation & Security Pte Ltd | Island Wide | - | SSO | SO | Bukit Batok |
| Union Security Services Pte. Ltd. | Island Wide | - | SSO | SO | Bukit Batok |
| TwinRock Global | Central | - | SO | SO | Bukit Batok |
| Dragnet Smartech Security Pte Ltd | East | - | SSO | SO | Bukit Batok |
| Peregrine Security Pte. Ltd. | Central | - | SSO | SO | Bukit Batok |
| Union Security Services Pte. Ltd. | North | - | SSO | SO | Bukit Batok |
| G4S Secure Solutions (Singapore) Pte Ltd | South | - | SO | SO | Bukit Batok |
| SATS Ltd | Island Wide | - | OM | SS | Tampines |
| Global Ritz Protection (Security Services) Pte Ltd | Island Wide | - | OE | SSS | Dover |
| Guthrie FMC Security Pte Ltd | Island Wide | - | OE | SSS | Dover |
| Premier Security Co-operative Ltd | Island Wide | - | SSO | Nil | Sengkang |
| Security Masters Pte Ltd | Island Wide | - | SS | SS | Jurong East |
| SATS Ltd | East | - | OE | CSO | Toa Payoh |
| Peregrine Security Pte. Ltd. | Island Wide | - | OE | CSO | Toa Payoh |
| Security Masters Pte Ltd | Island Wide | - | SS | SS | Hougang |
| Securus Pte Ltd | Island Wide | - | OM | SS | Hougang |
| Fervour Pte Ltd | Island Wide | - | OM | SS | Hougang |
| SMS Investigation & Security Pte Ltd | Central | - | OM | SS | Hougang |
| SATS Ltd | East | - | OE | SS | Hougang |
| TwinRock Global | Central | - | OE | SS | Hougang |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OE | CSO | Toa Payoh |
| Total Protection Solutions Pte Ltd | Island Wide | - | OM | Nil | - |
| Guthrie FMC Security Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
