| Inhouse Employer | Central | In-House | SS | SS | Hougang |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SSO | SSO | Bukit Batok |
| Soverus Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| Titanium Safety & Security Pte Ltd | North | In-House | SSO | CSO | Bedok |
| Regal Security & Fire Management Services Pte Ltd | Central | - | OE | SSS | Tampines |
| Elid Technology International Pte Ltd | East | Condominium | SO | SO | Pasir Ris |
| Global Ritz Protection (Security Services) Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| Elid Technology International Pte Ltd | West | Condominium | SS | CSO | Bukit Panjang |
| SMS Investigation & Security Pte Ltd | Central | Commercial | SO | SO | Serangoon |
| Inhouse Employer | Island Wide | Construction | OM | SS | MacPherson |
| Ascentiaa Security Management Pte Ltd | North | Condominium | SO | SO | Yishun |
| Total Protection Solutions Pte Ltd | Island Wide | - | OM | SS | Pioneer |
| Elid Technology International Pte Ltd | West | Condominium | SO | SO | Choa Chu Kang |
| Force-One Security | North | Data Centre | SO | SS | Marsiling |
| Inhouse Employer | West | Industrial / Factory | SO | SSO | Bukit Gombak |
| Soverus Pte Ltd | Island Wide | - | SSO | SO | Tampines |
| Union Security Services Pte. Ltd. | Island Wide | Commercial | SO | SSO | - |
| Inhouse Employer | North | Industrial / Factory | SSO | SSS | Marsiling |
| Certis Group | Central | School | SS | SS | Bukit Panjang |
| G4S Secure Solutions (Singapore) Pte Ltd | East | Commercial | SSO | SSO | Bedok |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SSO | SSO | Bukit Batok |
| Premier Security Co-operative Ltd | Central | Healthcare | SSS | CSO | Toa Payoh |
| Storm Protection Pte Ltd | West | Industrial / Factory | SS | SS | Bukit Panjang |
| Titanium Safety & Security Pte Ltd | North | In-House | OE | SS | Hougang |
| Inhouse Employer | Central | Mix-Development | Security Mgt | SSS | Pioneer |
