| Force-One Security | North | Data Centre | SS | SSS | Redhill |
| Trek Investigations & Security Management Services Pte Ltd | Island Wide | - | OE | CSO | Pasir Ris |
| G4S Secure Solutions (Singapore) Pte Ltd | East | In-House | SSO | CSO | Bedok |
| Ranger Investigation & Security Services Pte Ltd | East | In-House | SSO | SSO | Boon Lay |
| Aero Asia Security Systems Pte Ltd | Island Wide | - | OE | Nil | Jurong East |
| SATS Ltd | Island Wide | - | OM | SS | Choa Chu Kang |
| Star Security Services | Island Wide | - | Security Mgt | SS | Hougang |
| Securus Pte Ltd | Island Wide | - | OE | SO | - |
| SATS Ltd | Island Wide | - | OM | SSS | Tampines |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SSO | SSO | Eunos |
| Securus Pte Ltd | Island Wide | - | OM | SSS | Sengkang |
| RAS Security Pte Ltd | North | Commercial | OE | Nil | Pasir Ris |
| Reachfield Security & Safety Management Pte Ltd | Island Wide | Commercial | OE | SSS | Yishun |
| SATS Ltd | Island Wide | - | OM | CSO | Choa Chu Kang |
| Crowne Plaza Changi Airport | East | In-House | OE | SSS | Toa Payoh |
| G4S Secure Solutions (Singapore) Pte Ltd | Island Wide | - | OE | SS | Yishun |
| Orchid Hotel Private Limited | Central | In-House | OM | CSO | Toa Payoh |
| Reachfield Security & Safety Management Pte Ltd | Island Wide | - | Security Mgt | SSS | Tampines |
| Reachfield Security & Safety Management Pte Ltd | South | - | OE | SSO | Pasir Ris |
| Force-One Security | North | Data Centre | SS | SS | Yishun |
| Guthrie FMC Security Pte Ltd | Island Wide | - | OE | CSO | Pasir Ris |
| Primesafe Security & Investigation Pte Ltd | Central | Condominium | SSO | SSO | Bedok |
| Inhouse Employer | North | Commercial | SO | SSO | Boon Lay |
| Fervour Pte Ltd | Island Wide | - | OM | CSO | Marsiling |
| G4S Secure Solutions (Singapore) Pte Ltd | South | School | SO | SO | Clementi |
