| Ademco Security Pte Ltd | West | Industrial / Factory | SSO | SSO | Bukit Batok |
| Triple ‘S’ Protection Pte Ltd | West | Depot | SSO | SSO | Bukit Batok |
| Triple ‘S’ Protection Pte Ltd | West | Commercial | SSO | SSO | Bukit Batok |
| Peregrine Security Pte. Ltd. | Central | - | SSO | CSO | Bedok |
| Titanium Safety & Security Pte Ltd | North | In-House | SSO | CSO | Bedok |
| Triple ‘S’ Protection Pte Ltd | West | Depot | SSO | SSO | Bukit Batok |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SSO | SSO | Eunos |
| Certis Group | Central | Industrial / Factory | SSO | SO | Choa Chu Kang |
| ESA Security Pte Ltd | South | Hotel | SSO | SSO | - |
| Soverus Pte Ltd | Central | Data Centre | SSO | SSO | - |
| Excellent Security & Safety Pte Ltd | East | Data Centre | SSO | SSO | - |
| ESA Security Pte Ltd | West | Industrial / Factory | SSO | SSO | Jurong East |
| PICO Guards Pte Ltd | Central | School | SSO | SO | Boon Lay |
| William Secure Solutions Pte Ltd | West | Industrial / Factory | SSO | SO | Boon Lay |
| Triple ‘S’ Protection Pte Ltd | Central | Industrial / Factory | SSO | SO | Boon Lay |
| Ademco Security Pte Ltd | West | Industrial / Factory | SSO | SO | Boon Lay |
| G4S Secure Solutions (Singapore) Pte Ltd | West | School | SSO | SO | Boon Lay |
| G4S Secure Solutions (Singapore) Pte Ltd | East | In-House | SSO | SO | Boon Lay |
| Jasa Investigation & Security Services Pte Ltd | West | Industrial / Factory | SSO | SO | Boon Lay |
| PICO Guards Pte Ltd | West | Industrial / Factory | SSO | SO | Boon Lay |
| RAS Security Pte Ltd | North | Commercial | SSO | SO | Boon Lay |
| Ranger Investigation & Security Services Pte Ltd | East | In-House | SSO | SSO | Boon Lay |
| Ranger Investigation & Security Services Pte Ltd | East | In-House | SSO | SSO | Boon Lay |
| RAS Security Pte Ltd | North | Commercial | SSO | SS | Yishun |
| RAS Security Pte Ltd | North | Commercial | SSO | SS | Sembawang |
