| SATS Ltd | Island Wide | - | OM | SS | Hougang |
| Securus Pte Ltd | Island Wide | - | OM | SS | Hougang |
| Star Security Services | Island Wide | - | Security Mgt | SS | Hougang |
| TwinRock Global | Central | - | Security Mgt | SS | Hougang |
| G4S Secure Solutions (Singapore) Pte Ltd | South | - | SO | SO | - |
| Dragnet Smartech Security Pte Ltd | Central | - | Security Mgt | SO | Choa Chu Kang |
| Titanium Safety & Security Pte Ltd | Island Wide | - | OE | SS | Sengkang |
| Certis Group | Island Wide | - | SSO | SS | Sengkang |
| Dragnet Smartech Security Pte Ltd | Central | - | Security Mgt | SS | Woodlands |
| G4S Secure Solutions (Singapore) Pte Ltd | South | - | SO | SO | - |
| SMS Investigation & Security Pte Ltd | Central | - | OM | SO | Bedok |
| Union Security Services Pte. Ltd. | Island Wide | - | OE | SS | Woodlands |
| FormTeam Consultancy Pte Ltd | Island Wide | - | OE | SSO | Jurong East |
| Reachfield Security & Safety Management Pte Ltd | South | - | OE | SSS | Woodlands |
| Aero Asia Security Systems Pte Ltd | Island Wide | - | OE | CSO | Sengkang |
| G4S Secure Solutions (Singapore) Pte Ltd | South | - | SO | SO | - |
| Dragnet Smartech Security Pte Ltd | East | - | SSO | SSO | Jurong East |
| SATS Ltd | Island Wide | - | OM | CSO | Queenstown |
| Total Protection Solutions Pte Ltd | Island Wide | - | OM | CSO | Queenstown |
| Peregrine Security Pte. Ltd. | Island Wide | - | OE | SS | Woodlands |
| Ascentiaa Security Management Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| FormTeam Consultancy Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| Guthrie FMC Security Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| Soverus Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| GoMobile Security Solutions Pte Ltd | Island Wide | - | OM | SS | Woodlands |
