| Ranger Investigation & Security Services Pte Ltd | Island Wide | In-House | SS | SSS | Punggol |
| Ademco Security Pte Ltd | South | Mix-Development | SS | SS | Aljunied |
| Eagle I Security Services Pte Ltd | East | Commercial | SS | SS | Pasir Ris |
| Securitas Guarding Services (Singapore) Pte Ltd | East | Data Centre | SS | CSO | Yishun |
| Security & Risk Solutions Pte. Ltd. | East | Office Building | SS | SS | Hougang |
| G4S Secure Solutions (Singapore) Pte Ltd | West | Industrial / Factory | SS | SSS | Jurong East |
| AGS Integration Pte. Ltd. | West | In-House | SS | SSS | Choa Chu Kang |
| Security & Risk Solutions Pte. Ltd. | East | Office Building | SS | SS | Hougang |
| Inhouse Employer | Central | In-House | SS | SS | Hougang |
| Reachfield Security & Safety Management Pte Ltd | Central | School | SS | SSO | MacPherson |
| Peregrine Security Pte. Ltd. | Island Wide | - | SS | SS | Marsiling |
| Inhouse Employer | Central | In-House | SS | SS | Hougang |
| Security & Risk Solutions Pte. Ltd. | East | Office Building | SS | SS | Hougang |
| AGS Integration Pte. Ltd. | West | In-House | SS | SS | Woodlands |
| Union Security Services Pte. Ltd. | East | Data Centre | SS | SO | Woodlands |
| PICO Guards Pte Ltd | North | Industrial / Factory | SS | SO | Woodlands |
| Union Security Services Pte. Ltd. | East | Data Centre | SS | SS | Woodlands |
| AGS Integration Pte. Ltd. | West | In-House | SS | SS | Woodlands |
| Storm Protection Pte Ltd | West | Industrial / Factory | SS | SS | Bukit Panjang |
| Triple ‘S’ Protection Pte Ltd | West | Commercial | SS | SS | Bukit Panjang |
| Union Security Services Pte. Ltd. | West | Condominium | SS | SS | Bukit Panjang |
| Premier Security Co-operative Ltd | Central | Commercial | SS | SS | Hougang |
| Force-One Security | North | Data Centre | SS | SSS | Ang Mo Kio |
| Union Security Services Pte. Ltd. | East | Data Centre | SS | SS | Yishun |
| Union Security Services Pte. Ltd. | East | Data Centre | SS | SS | Yishun |
