| Inhouse Employer | Island Wide | Construction | OM | SS | Hougang |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OE | CSO | Boon Lay |
| G4S Secure Solutions (Singapore) Pte Ltd | North | School | SSO | SSO | Yishun |
| G4S Secure Solutions (Singapore) Pte Ltd | North | School | SSO | SSO | Marsiling |
| SMS Investigation & Security Pte Ltd | Central | - | OM | SO | Woodlands |
| SATS Ltd | Island Wide | - | OM | SS | Yishun |
| G4S Secure Solutions (Singapore) Pte Ltd | West | Industrial / Factory | SO | SO | Boon Lay |
| Total Protection Solutions Pte Ltd | Island Wide | - | OM | CSO | Choa Chu Kang |
| Premier Security Co-operative Ltd | Central | - | SS | SSO | Simei |
| Soverus Pte Ltd | Island Wide | - | SSS | SSS | Yishun |
| Inhouse Employer | West | In-House | OM | SS | Hougang |
| Inhouse Employer | West | In-House | OM | SSS | Sengkang |
| RAS Security Pte Ltd | North | Commercial | OE | SSS | Bedok |
| Certis Group | Island Wide | Commercial | SO | SO | Yishun |
| Eagle I Security Services Pte Ltd | East | Commercial | SS | SS | Pasir Ris |
| Orchid Hotel Private Limited | Central | In-House | OM | SSS | Queenstown |
| Titanium Safety & Security Pte Ltd | Island Wide | - | OE | SSO | Hougang |
| Securus Pte Ltd | Island Wide | - | OM | SSS | Ang Mo Kio |
| Reachfield Security & Safety Management Pte Ltd | Central | School | SO | SSO | Jurong East |
| GCH Pte. Ltd. | Central | In-House | SSO | SS | Yishun |
| Union Security Services Pte. Ltd. | North | Commercial | SS | SSO | Sembawang |
| Titanium Safety & Security Pte Ltd | Island Wide | - | OE | SSO | Hougang |
| Jasa Investigation & Security Services Pte Ltd | East | Condominium | SS | SS | Choa Chu Kang |
| Securitas Guarding Services (Singapore) Pte Ltd | West | Commercial | SSO | SSO | - |
| Total Protection Solutions Pte Ltd | Island Wide | - | OM | CSO | Choa Chu Kang |
