| G4S Secure Solutions (Singapore) Pte Ltd | West | Industrial / Factory | SS | SS | Simei |
| PICO Guards Pte Ltd | North | Industrial / Factory | SSO | SSO | Yishun |
| Prospect Protection Pte Ltd | West | Industrial / Factory | SSO | SSO | - |
| Prospect Protection Pte Ltd | East | Industrial / Factory | SO | SO | Punggol |
| Prospect Protection Pte Ltd | West | Industrial / Factory | SSO | SSO | - |
| GoMobile Security Solutions Pte Ltd | North | Industrial / Factory | SO | SO | Woodlands |
| G4S Secure Solutions (Singapore) Pte Ltd | West | Industrial / Factory | SS | SS | Jurong East |
| Union Security Services Pte. Ltd. | Central | Industrial / Factory | SS | SS | Hougang |
| Union Security Services Pte. Ltd. | Central | Industrial / Factory | SS | SS | Woodlands |
| IGC Security Services Pte Ltd | South | Industrial / Factory | SO | SO | Punggol |
| Inhouse Employer | North | Industrial / Factory | SSO | SS | Yishun |
| Reachfield Security & Safety Management Pte Ltd | West | Industrial / Factory | SS | Nil | Pioneer |
| Reachfield Security & Safety Management Pte Ltd | West | Industrial / Factory | SS | SSS | Yishun |
| Hawkeye Security Solutions Pte Ltd | West | Industrial / Factory | SS | SS | Woodlands |
| Pedro Investigations & Security Services Pte. Ltd. | Central | Industrial / Factory | SO | SS | Tuas Link |
| Ademco Security Pte Ltd | West | Industrial / Factory | SSO | SSO | Bukit Batok |
| Certis Group | Central | Industrial / Factory | SSO | SO | Choa Chu Kang |
| GoMobile Security Solutions Pte Ltd | West | Industrial / Factory | SO | SO | Choa Chu Kang |
| Pedro Investigations & Security Services Pte. Ltd. | Central | Industrial / Factory | SO | SO | Woodlands |
| Reachfield Security & Safety Management Pte Ltd | West | Industrial / Factory | SS | SO | Yishun |
| ESA Security Pte Ltd | West | Industrial / Factory | SSO | SSO | Jurong East |
| 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 |
| Jasa Investigation & Security Services Pte Ltd | West | Industrial / Factory | SSO | SO | Boon Lay |
