| Metropolis Security Systems Pte Ltd | Island Wide | - | OE | SS | Pasir Ris |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| SATS Ltd | East | - | OE | SSS | Toa Payoh |
| G4S Secure Solutions (Singapore) Pte Ltd | East | Commercial | SSO | SSO | Bedok |
| SMS Security | East | Condominium | SO | SO | Bedok |
| Inhouse Employer | South | In-House | OE | SS | Ang Mo Kio |
| York Hotel (Private) Limited | Central | In-House | OM | SSO | Hougang |
| Horus I (Private Limited) | South | Retail | SO | SO | Pasir Ris |
| Titanium Safety & Security Pte Ltd | West | Dormitory | SSO | SSO | Bukit Batok |
| Acestes Pte Ltd | Island Wide | - | OM | CSO | Toa Payoh |
| Certis Group | East | - | SO | SS | Simei |
| Peregrine Security Pte. Ltd. | Island Wide | - | OE | SSS | Sengkang |
| Star Security Services | Island Wide | - | Security Mgt | Nil | Bukit Batok |
| Orchid Hotel Private Limited | Central | In-House | OM | CSO | Toa Payoh |
| Star Security Services | Island Wide | - | Security Mgt | CSO | Marsiling |
| Inhouse Employer | Central | Mix-Development | Security Mgt | SSS | Sengkang |
| GoMobile Security Solutions Pte Ltd | Island Wide | - | OM | SS | Woodlands |
| SMS Investigation & Security Pte Ltd | Central | Condominium | SS | SS | Marsiling |
| SMS Investigation & Security Pte Ltd | Central | Condominium | SSO | SS | Pioneer |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OE | Nil | Commonwealth |
| Peregrine Security Pte. Ltd. | Island Wide | - | OE | CSO | Sembawang |
| Ranger Investigation & Security Services Pte Ltd | East | In-House | SSO | SSO | Bukit Batok |
| SATS Ltd | Island Wide | - | OM | SS | Clementi |
| Force-One Security | North | Data Centre | SS | SS | Jurong East |
| Reachfield Security & Safety Management Pte Ltd | Island Wide | - | Security Mgt | SSS | Tampines |
