| G4S Secure Solutions (Singapore) Pte Ltd | East | Commercial | SSO | SSO | Bedok |
| Certis Group | Island Wide | - | SSO | SSS | Yishun |
| Star Security Services | Island Wide | - | Security Mgt | Nil | Ang Mo Kio |
| Royal Security Management Services Pte Ltd | East | Commercial | SO | SO | Pasir Ris |
| RAS Security Pte Ltd | North | Commercial | SSO | SS | Sembawang |
| Inhouse Employer | Central | Mix-Development | Security Mgt | SSO | Woodlands |
| TwinRock Global | East | Condominium | SO | SO | Mountbatten |
| Star Security Services | Island Wide | - | Security Mgt | SS | Hougang |
| Inhouse Employer | West | In-House | OM | CSO | Marsiling |
| Certis Group | South | Healthcare | SS | SS | Admiralty |
| Inhouse Employer | Central | In-House | SS | SS | Hougang |
| Triple ‘S’ Protection Pte Ltd | Island Wide | Commercial | SO | SO | Pioneer |
| Hawkeye Security Solutions Pte Ltd | West | Industrial / Factory | SS | SS | Woodlands |
| Dorsett Singapore | Central | Hotel | SSO | SS | HarbourFront |
| SATS Ltd | Island Wide | - | OM | CSO | Toa Payoh |
| Kingston Property Maintenance Services Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| Soverus Pte Ltd | Island Wide | - | OE | CSO | Toa Payoh |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | Island Wide | - | OE | SS | Clementi |
| Peregrine Security Pte. Ltd. | Island Wide | - | OE | CSO | Marsiling |
| Sands Global Pte Ltd | East | Condominium | SO | SO | Simei |
| AGS Integration Pte. Ltd. | West | In-House | SS | SO | Woodlands |
| Straits Retail Property Management Services Pte. Ltd. | Central | In-House | SO | SS | Pioneer |
| Force-One Security | North | Data Centre | SS | SS | Marsiling |
| Inhouse Employer | Central | In-House | SS | SSS | Redhill |
| Legion Protection Pte Ltd | Island Wide | - | OE | SS | Woodlands |
