| Inhouse Employer | Island Wide | - | OE | SO | - |
| Sands Global Pte Ltd | Central | Condominium | SS | SO | - |
| William Secure Solutions Pte Ltd | Central | Condominium | SS | SO | - |
| TwinRock Global | Central | - | Security Mgt | SO | - |
| Ascentiaa Security Management Pte Ltd | Island Wide | - | SS | SO | - |
| TwinRock Global | Central | - | OE | SO | - |
| William Secure Solutions Pte Ltd | Central | Condominium | SS | SO | - |
| Kingston Property Maintenance Services Pte Ltd | Central | Condominium | SSO | SSO | - |
| G4S Secure Solutions (Singapore) Pte Ltd | West | School | SO | SO | - |
| Certis Group | North | Commercial | SO | SO | - |
| Fervour Pte Ltd | North | Data Centre | SO | SO | - |
| SMS Security | East | Condominium | SO | SO | - |
