| Prospect Protection Pte Ltd | East | Industrial / Factory | SO | SO | Pasir Ris |
| TwinRock Global | Central | - | Security Mgt | SS | Hougang |
| SATS Ltd | Island Wide | - | OM | SSS | Yishun |
| Inhouse Employer | West | In-House | OM | CSO | Bedok Reservoir |
| GoMobile Security Solutions Pte Ltd | Island Wide | - | OM | CSO | Bedok |
| Union Security Services Pte. Ltd. | North | Commercial | SS | SS | Marsiling |
| Star Security Services | Island Wide | - | Security Mgt | SSS | Woodlands |
| G4S Secure Solutions (Singapore) Pte Ltd | Central | In-House | SSO | SSO | Jurong East |
| Securus Pte Ltd | Island Wide | - | OE | SO | - |
| Crowne Plaza Changi Airport | East | Hotel | Security Mgt | SS | Sengkang |
| Ascentiaa Security Management Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| Security & Risk Solutions Pte. Ltd. | Island Wide | - | OE | SSO | Marsiling |
| Inhouse Employer | West | In-House | OM | CSO | Marsiling |
| Securus Pte Ltd | Island Wide | - | OE | CSO | Bedok |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SSO | SSS | Toa Payoh |
| Certis Group | Island Wide | - | SO | SS | Admiralty |
| William Secure Solutions Pte Ltd | Central | Condominium | SO | SS | Farrer Park |
| Crowne Plaza Changi Airport | East | In-House | OE | SS | Sengkang |
| TwinRock Global | Central | - | OE | CSO | Bedok |
| Ascentiaa Security Management Pte Ltd | Island Wide | - | SS | SSS | Sengkang |
| Trek Investigations & Security Management Services Pte Ltd | Island Wide | - | OE | SSS | Bedok |
| Reachfield Security & Safety Management Pte Ltd | South | Commercial | CSO | Nil | Sengkang |
| Certis Group | Central | Commercial | SO | SSO | Bukit Batok |
| Aero Asia Security Systems Pte Ltd | Island Wide | - | OE | Nil | Yishun |
| Securitas Guarding Services (Singapore) Pte Ltd | East | Data Centre | SO | SSO | Tampines |
