| Reachfield Security & Safety Management Pte Ltd | Central | School | Security Mgt | SS | Woodlands |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SSO | SSS | Tampines |
| RAS Security Pte Ltd | North | Commercial | SSO | SSO | Bukit Batok |
| Pedro Investigations & Security Services Pte. Ltd. | Central | - | SSO | CSO | Bedok |
| Orchid Hotel Private Limited | Central | In-House | OM | CSO | Toa Payoh |
| Crowne Plaza Changi Airport | East | In-House | OM | SSO | Clementi |
| Triple ‘S’ Protection Pte Ltd | Island Wide | Commercial | SO | SSS | Bukit Batok |
| Securitas Guarding Services (Singapore) Pte Ltd | East | Data Centre | SO | SS | Aljunied |
| Concorde Security Pte Ltd | Island Wide | - | OE | SO | Pasir Ris |
| AGS Integration Pte. Ltd. | West | In-House | SS | SSO | - |
| Union Security Services Pte. Ltd. | North | Commercial | SS | SS | Yishun |
| RAS Security Pte Ltd | North | Commercial | SSO | SO | Clementi |
| Metropolis Security Systems Pte Ltd | Island Wide | - | OE | SSS | Yishun |
| Uniforce Security Services Pte Ltd | East | Commercial | SS | SS | Tampines |
| Securus Pte Ltd | Island Wide | - | OM | SS | Bukit Panjang |
| Royal Security Management Services Pte Ltd | Island Wide | - | OE | SSS | Dover |
| King's Security and Safety Management Pte Ltd | Island Wide | - | Sec Tech / Eng | SO | Sengkang |
| G4S Secure Solutions (Singapore) Pte Ltd | East | In-House | SSO | SSO | - |
| Inhouse Employer | Central | In-House | SO | SO | - |
| Force-One Security | Central | Commercial | SO | SO | Bukit Batok |
| Acestes Pte Ltd | Island Wide | - | OM | Nil | Yishun |
| G4S Secure Solutions (Singapore) Pte Ltd | East | Commercial | SSO | SSO | Bedok North |
| Securus Pte Ltd | Island Wide | - | OE | SS | Bukit Batok |
| Securitas Guarding Services (Singapore) Pte Ltd | East | Data Centre | SS | SS | MacPherson |
| Triple ‘S’ Protection Pte Ltd | West | Commercial | SS | SS | Woodlands |
