| TwinRock Global | Central | - | Security Mgt | SS | Pasir Ris |
| Metropolis Security Systems Pte Ltd | Island Wide | Mix-Development | SS | SS | Woodlands |
| Premier Security Co-operative Ltd | Central | Healthcare | SSS | SS | Woodlands |
| Ranger Investigation & Security Services Pte Ltd | Island Wide | In-House | SS | SS | Woodlands |
| Premier Security Co-operative Ltd | Central | Healthcare | SSS | SS | Farrer Park |
| William Secure Solutions Pte Ltd | Central | Condominium | SO | SS | Farrer Park |
| Union Security Services Pte. Ltd. | East | Data Centre | SS | SS | Farrer Park |
| RAS Security Pte Ltd | North | Commercial | SSO | SS | Yishun |
| RAS Security Pte Ltd | North | Commercial | SSO | SS | Sembawang |
| Securus Pte Ltd | Island Wide | - | OE | SS | Clementi |
| Peregrine Security Pte. Ltd. | Island Wide | - | OE | SS | Clementi |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | Island Wide | - | OE | SS | Clementi |
| Guthrie FMC Security Pte Ltd | Island Wide | - | OE | SS | Clementi |
| SATS Ltd | Island Wide | - | OM | SS | Clementi |
| GoMobile Security Solutions Pte Ltd | Island Wide | - | OM | SS | Clementi |
| Acestes Pte Ltd | Island Wide | - | OM | SS | Clementi |
| SATS Ltd | Island Wide | - | Inves | SS | Clementi |
| FormTeam Consultancy Pte Ltd | Island Wide | - | OE | SS | Clementi |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | Island Wide | - | OE | SS | Clementi |
| G4S Secure Solutions (Singapore) Pte Ltd | Island Wide | - | OE | SS | Clementi |
| SATS Ltd | East | - | OE | SS | Clementi |
| Soverus Pte Ltd | Island Wide | - | OE | SS | Clementi |
| Star Security Services | Island Wide | - | Security Mgt | SS | Clementi |
| Reachfield Security & Safety Management Pte Ltd | Central | School | Security Mgt | SS | Clementi |
| TwinRock Global | Central | - | Security Mgt | SS | Clementi |
