| G4S Secure Solutions (Singapore) Pte Ltd | Central | In-House | SSO | SSO | Boon Lay |
| G4S Secure Solutions (Singapore) Pte Ltd | East | Commercial | SSO | SSO | Bedok |
| RAS Security Pte Ltd | East | Commercial | SSO | SSO | Bedok |
| Certis Group | Central | Commercial | SO | SSO | Choa Chu Kang |
| Certis Group | Island Wide | - | SSO | SSO | Choa Chu Kang |
| Certis Group | Island Wide | - | SSO | SSO | Choa Chu Kang |
| Certis Group | Island Wide | - | SSO | SSO | Choa Chu Kang |
| Certis Group | Central | Commercial | SO | SSO | Choa Chu Kang |
| AGS Integration Pte. Ltd. | West | In-House | SS | SSO | Choa Chu Kang |
| Certis Group | Central | Commercial | SO | SSO | Choa Chu Kang |
| Certis Group | Central | Commercial | SO | SSO | Choa Chu Kang |
| Certis Group | Central | Commercial | SO | SSO | Choa Chu Kang |
| Soverus Pte Ltd | Island Wide | - | SSO | SSO | Choa Chu Kang |
| Force-One Security | Central | Commercial | SO | SSO | Choa Chu Kang |
| Certis Group | Central | Commercial | SO | SSO | Choa Chu Kang |
| Inhouse Employer | Central | Healthcare | OE | SSO | Serangoon |
| Star Security Services | Island Wide | - | Security Mgt | SSO | Hougang |
| Star Security Services | Island Wide | - | Security Mgt | SSO | Hougang |
| Certis Group | Island Wide | - | SSO | SSO | Choa Chu Kang |
| Certis Group | Central | Commercial | SO | SSO | Choa Chu Kang |
| SECOM Smart (Singapore) Pte. Ltd. | West | Commercial | SSO | SSO | Choa Chu Kang |
| RAS Security Pte Ltd | North | Commercial | SSO | SSO | Commonwealth |
| PICO Guards Pte Ltd | Central | School | SSO | SSO | Commonwealth |
| Pan Pacific Singapore | South | In-House | Security Mgt | SSO | Hougang |
| Inhouse Employer | North | Commercial | SO | SSO | Choa Chu Kang |
