| Royal Security Management Services Pte Ltd | Island Wide | - | OE | Nil | Boon Lay |
| Eagle I Security Services Pte Ltd | Island Wide | - | OE | SSS | Bedok |
| SATS Ltd | Island Wide | - | Inves | SS | Choa Chu Kang |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SSO | SSS | Toa Payoh |
| Legion Protection Pte Ltd | Island Wide | - | OE | CSO | Bedok |
| Dragnet Smartech Security Pte Ltd | Island Wide | - | SS | SS | Sengkang |
| Orchid Hotel Private Limited | Central | In-House | OM | SS | Pioneer |
| Security & Risk Solutions Pte. Ltd. | Island Wide | - | OE | SS | Sengkang |
| Reachfield Security & Safety Management Pte Ltd | Island Wide | - | Security Mgt | CSO | Toa Payoh |
| GoMobile Security Solutions Pte Ltd | Island Wide | - | OM | CSO | Marsiling |
| Soverus Pte Ltd | Island Wide | - | SSS | Nil | Woodlands |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OE | CSO | Bedok |
| SATS Ltd | East | - | OE | SSS | Yishun |
| Storm Protection Pte Ltd | West | Industrial / Factory | SS | SS | Bukit Panjang |
| Inhouse Employer | West | In-House | OM | SS | Tampines |
| AGS Integration Pte. Ltd. | Island Wide | - | OE | SS | Choa Chu Kang |
| Regal Security & Fire Management Services Pte Ltd | Central | - | OE | CSO | Pasir Ris |
| Union Security Services Pte. Ltd. | Island Wide | - | OE | SSS | Sengkang |
| Certis Group | Island Wide | - | SO | SS | Admiralty |
| Inhouse Employer | East | School | SO | SO | Bedok |
| G4S Secure Solutions (Singapore) Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| Trek Investigations & Security Management Services Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| SMS Investigation & Security Pte Ltd | North | Condominium | SSO | SSO | Marsiling |
| Soverus Pte Ltd | Central | Data Centre | SSS | SSS | Woodlands |
| Inhouse Employer | Island Wide | - | OE | SSO | Hougang |
