| Force-One Security | North | Data Centre | SO | SSO | Marsiling |
| Soverus Pte Ltd | East | School | SO | SO | Yishun |
| Brink's Singapore Pte Ltd | East | - | SO | SO | Pasir Ris |
| Inhouse Employer | West | In-House | SO | SSO | Bukit Gombak |
| Inhouse Employer | West | In-House | SO | SSO | Bukit Gombak |
| Inhouse Employer | West | In-House | SO | SSO | Bukit Gombak |
| First Security & Private Investigation (Singapore) Pte Ltd | North | Condominium | SO | SSO | Woodlands |
| G4S Secure Solutions (Singapore) Pte Ltd | East | School | SO | SO | Lavender |
| Trek Investigations & Security Management Services Pte Ltd | East | Condominium | SO | SO | Lavender |
| Inhouse Employer | West | In-House | SO | SSO | Bukit Gombak |
| Prosegur Singapore Pte Ltd | South | Commercial | SO | SO | Hougang |
| Inhouse Employer | West | School | SO | CSO | Bukit Panjang |
| G4S Secure Solutions (Singapore) Pte Ltd | East | School | SO | SO | Lavender |
| Pan Pacific Serviced Suites Beach Road | South | In-House | SO | SO | Lavender |
| First Security & Private Investigation (Singapore) Pte Ltd | North | Industrial / Factory | SO | SO | Hougang |
| Inhouse Employer | West | Industrial / Factory | SO | SO | Tuas Link |
| Guthrie FMC Security Pte Ltd | North | Dormitory | SO | SSO | Yishun |
| Inhouse Employer | West | Industrial / Factory | SO | SO | Choa Chu Kang |
| Inhouse Employer | East | In-House | SO | SO | Choa Chu Kang |
| Security & Risk Solutions Pte. Ltd. | East | Commercial | SO | SO | Punggol |
| Elitez Security Pte Ltd | East | Place of Worship | SO | SSO | Woodlands |
| G4S Secure Solutions (Singapore) Pte Ltd | West | School | SO | SO | - |
| Certis Group | North | Commercial | SO | SO | - |
| Fervour Pte Ltd | North | Data Centre | SO | SO | - |
| SMS Security | East | Condominium | SO | SO | - |
