| Inhouse Employer | Island Wide | Construction | OM | SS | Sengkang |
| Prosec Services Pte Ltd | Central | Mix-Development | SO | Nil | Jurong East |
| Prosec Services Pte Ltd | East | Retail | SSO | SSS | Yishun |
| Prosegur Singapore Pte Ltd | East | Industrial / Factory | SO | SO | Kaki Bukit |
| TwinRock Global | Central | - | Security Mgt | SS | Pasir Ris |
| Peregrine Security Pte. Ltd. | North | Healthcare | SO | SO | Ang Mo Kio |
| Aero Asia Security Systems Pte Ltd | Island Wide | - | OE | SS | Sembawang |
| G4S Secure Solutions (Singapore) Pte Ltd | Central | In-House | SSO | SO | Bukit Batok |
| Pan Pacific Singapore | South | In-House | Security Mgt | SS | Ang Mo Kio |
| Reachfield Security & Safety Management Pte Ltd | East | School | SO | SO | Yishun |
| Fervour Pte Ltd | Central | Data Centre | SO | SO | Hougang |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OM | SSS | Chinese Garden |
| Ranger Investigation & Security Services Pte Ltd | South | In-House | SSO | CSO | Marsiling |
| Titanium Safety & Security Pte Ltd | North | In-House | OE | SSO | Marsiling |
| TwinRock Global | Central | - | Security Mgt | Nil | Ang Mo Kio |
| TwinRock Global | West | Condominium | SSO | SSO | Woodlands |
| Orchid Hotel Private Limited | Central | In-House | OM | SS | Pioneer |
| Force-One Security | North | Data Centre | OE | CSO | Toa Payoh |
| G4S Secure Solutions (Singapore) Pte Ltd | East | In-House | SSO | SO | Yishun |
| Horus I (Private Limited) | Central | Retail | SO | SO | Bras Basah |
| Certis Group | Central | Commercial | SO | SS | Choa Chu Kang |
| Royal Security Management Services Pte Ltd | Island Wide | - | OE | SS | Sengkang |
| SATS Ltd | Island Wide | - | Inves | Nil | Sengkang |
| Star Security Services | Island Wide | - | Security Mgt | CSO | Marsiling |
| Acestes Pte Ltd | Island Wide | - | OM | SSS | Sengkang |
