| First Security & Private Investigation (Singapore) Pte Ltd | South | Condominium | SS | SSS | Clementi |
| Fervour Pte Ltd | Island Wide | - | OM | CSO | Marsiling |
| Trek Investigations & Security Management Services Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| Union Security Services Pte. Ltd. | North | - | SSO | SSS | Yishun |
| AGS Integration Pte. Ltd. | West | In-House | SS | CSO | Woodlands |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| IGC Security Services Pte Ltd | South | Commercial | SS | SSS | Yishun |
| A-SAT Pte Ltd | North | Commercial | SSO | SSO | Bukit Batok |
| Crowne Plaza Changi Airport | East | In-House | OM | SS | Marsiling |
| Soverus Pte Ltd | North | Industrial / Factory | SO | SO | Woodlands |
| Union Security Services Pte. Ltd. | East | Data Centre | SS | SSS | Tampines West |
| G4S Secure Solutions (Singapore) Pte Ltd | South | School | SO | SO | Clementi |
| SATS Ltd | Island Wide | - | OM | CSO | Choa Chu Kang |
| Guthrie FMC Security Pte Ltd | West | Dormitory | SO | SO | Bukit Gombak |
| RAS Security Pte Ltd | East | Commercial | SSO | SSO | Bedok |
| Royal Security Management Services Pte Ltd | Island Wide | - | OE | SS | Sengkang |
| RAS Security Pte Ltd | North | Commercial | OE | SS | Woodlands South |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OE | CSO | Boon Lay |
| FormTeam Consultancy Pte Ltd | Central | Condominium | SO | SSO | Woodlands |
| AGS Integration Pte. Ltd. | West | In-House | SS | SS | Bukit Batok |
| Metropolis Security Systems Pte Ltd | East | Condominium | SSO | SSO | Bedok North |
| Certis Group | East | Gov Building | SO | SO | Bedok |
| Inhouse Employer | Central | Hotel | SO | SSO | Woodlands |
| Total Protection Solutions Pte Ltd | Island Wide | - | OM | SSS | Yishun |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | West | Dormitory | SO | SO | Bukit Gombak |
