| Certis Group | Central | Commercial | SO | SS | Choa Chu Kang |
| Securus Pte Ltd | Island Wide | - | OE | CSO | Choa Chu Kang |
| RAS Security Pte Ltd | North | Commercial | SSO | SSO | Hougang |
| Supreme Security Agency Pte. Ltd. | West | Industrial / Factory | SO | SO | Bukit Gombak |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| Inhouse Employer | Central | In-House | SSS | CSO | Marsiling |
| FormTeam Consultancy Pte Ltd | Island Wide | - | OE | SS | Marsiling |
| SMS Investigation & Security Pte Ltd | Central | - | OM | CSO | Pasir Ris |
| Reachfield Security & Safety Management Pte Ltd | Island Wide | Commercial | OE | CSO | Marsiling |
| Star Security Services | Island Wide | - | Security Mgt | SS | Pioneer |
| Crowne Plaza Changi Airport | East | Hotel | Security Mgt | SSS | Jurong East |
| Acestes Pte Ltd | Central | - | Security Mgt | SS | Bukit Batok |
| SATS Ltd | Island Wide | - | OM | Nil | Bukit Batok |
| Triple ‘S’ Protection Pte Ltd | Island Wide | Commercial | SO | SSO | Bishan |
| Young Women's Christian Association of Singapore | Central | In-House | SS | SSS | Marsiling |
| SATS Ltd | Island Wide | - | OM | SSS | Sengkang |
| AGS Integration Pte. Ltd. | Island Wide | - | OE | CSO | Marsiling |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OM | SSS | Sengkang |
| SATS Ltd | Island Wide | - | Inves | SSS | Dakota |
| TwinRock Global | Central | - | OE | SS | Hougang |
| Titanium Safety & Security Pte Ltd | North | In-House | OE | CSO | Pasir Ris |
| SECOM Singapore Pte Ltd | Island Wide | - | OE | SS | Sengkang |
| Inhouse Employer | Island Wide | - | OE | SSO | Boon Lay |
| FormTeam Consultancy Pte Ltd | Island Wide | - | OE | SSS | Bukit Batok |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SSO | SSS | Toa Payoh |
