| SMS Investigation & Security Pte Ltd | Central | - | OM | SS | Choa Chu Kang |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SSO | SS | Ang Mo Kio |
| Crowne Plaza Changi Airport | East | In-House | OE | SSS | Toa Payoh |
| Eagle I Security Services Pte Ltd | Island Wide | - | OE | CSO | Ang Mo Kio |
| First Security & Private Investigation (Singapore) Pte Ltd | Central | Retail | SO | SS | Punggol |
| G4S Secure Solutions (Singapore) Pte Ltd | East | Commercial | SSO | SSO | Simei |
| Titanium Safety & Security Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| PICO Guards Pte Ltd | Island Wide | - | OM | SSS | Sengkang |
| PICO Guards Pte Ltd | Island Wide | - | OM | SS | Pioneer |
| AGS Integration Pte. Ltd. | Island Wide | - | OE | SS | Woodlands |
| Certis Group | Island Wide | Commercial | SO | SSO | Pasir Ris |
| Uniforce Security Services Pte Ltd | Island Wide | - | OE | CSO | Bedok |
| Orchid Hotel Private Limited | Central | In-House | OM | SSO | Jurong East |
| Pan Pacific Singapore | South | In-House | Security Mgt | SSS | Yishun |
| Prosec Services Pte Ltd | East | - | SSO | SSO | Tampines |
| Orchid Hotel Private Limited | Central | In-House | OM | CSO | Marsiling |
| Ascentiaa Security Management Pte Ltd | Island Wide | - | SS | SSS | Pioneer |
| Union Security Services Pte. Ltd. | Island Wide | - | OE | SS | Woodlands |
| GoMobile Security Solutions Pte Ltd | Island Wide | - | OM | SSS | Sengkang |
| Premier Security Co-operative Ltd | Central | Healthcare | SSS | SSS | Tampines |
| Premier Security Co-operative Ltd | East | Commercial | SO | SO | Simei |
| SATS Ltd | East | - | OE | CSO | Toa Payoh |
| Kingston Property Maintenance Services Pte Ltd | Island Wide | - | OE | Nil | Ang Mo Kio |
| AGS Integration Pte. Ltd. | West | In-House | SS | CSO | Woodlands |
| Titanium Safety & Security Pte Ltd | Island Wide | - | OE | SSS | Tampines |
