| Certis Group | Island Wide | - | SSO | SS | Choa Chu Kang |
| Inhouse Employer | Central | Hotel | SO | SSO | Woodlands |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| Acestes Pte Ltd | Central | - | Security Mgt | SO | Choa Chu Kang |
| Inhouse Employer | Central | Hotel | SO | SSO | Bukit Batok |
| Premier Security Co-operative Ltd | East | Commercial | SS | SS | Tampines |
| G4S Secure Solutions (Singapore) Pte Ltd | East | In-House | SSO | SO | Yishun |
| G4S Secure Solutions (Singapore) Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OE | Nil | Dover |
| William Secure Solutions Pte Ltd | East | Condominium | SO | SO | Yishun |
| Prosegur Singapore Pte Ltd | South | Commercial | SSS | Nil | Sengkang |
| Soverus Pte Ltd | Island Wide | - | SSS | SS | Bukit Panjang |
| Grand Copthorne Waterfront Hotel | Central | In-House | Security Mgt | SS | Punggol |
| Certis Group | South | Healthcare | SS | SS | Hougang |
| SATS Ltd | Island Wide | - | Inves | CSO | Choa Chu Kang |
| Securus Pte Ltd | Island Wide | - | OM | SSS | Yishun |
| Ascentiaa Security Management Pte Ltd | East | Condominium | SSO | SSO | Pasir Ris |
| G4S Secure Solutions (Singapore) Pte Ltd | Central | Retail | SO | SO | - |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SO | SSO | Jurong East |
| Prosegur Singapore Pte Ltd | Island Wide | - | OE | SS | Tampines |
| SATS Ltd | Island Wide | - | Inves | SSO | Boon Lay |
| Inhouse Employer | North | In-House | SO | SO | Woodlands |
| Inhouse Employer | Island Wide | Construction | OM | SS | Choa Chu Kang |
| Focus Security Services Pte Ltd | North | Condominium | SSO | SSO | Pasir Ris |
| IGC Security Services Pte Ltd | South | Industrial / Factory | SO | SO | Punggol |
