| Ranger Investigation & Security Services Pte Ltd | North | Construction | SO | SSO | Yishun |
| Inhouse Employer | Island Wide | Construction | OM | SSO | Hougang |
| Inhouse Employer | Island Wide | Construction | OM | CSO | Boon Lay |
| Mainguard Security Services (S) Pte Ltd | South | Construction | SO | SSO | Tuas Link |
| Inhouse Employer | Island Wide | Construction | OM | SS | Ang Mo Kio |
| Inhouse Employer | Island Wide | Construction | OM | CSO | Boon Lay |
| Mainguard Security Services (S) Pte Ltd | South | Construction | SO | Nil | Aljunied |
| Prospect Protection Pte Ltd | West | Construction | SS | SS | - |
| G4S Secure Solutions (Singapore) Pte Ltd | West | Construction | SO | SO | Bukit Gombak |
| Inhouse Employer | Island Wide | Construction | OM | SSS | MacPherson |
| Inhouse Employer | Island Wide | Construction | OM | SS | Sengkang |
| Inhouse Employer | Island Wide | Construction | OM | SS | Pioneer |
| Inhouse Employer | Island Wide | Construction | OM | SO | Sembawang |
| Inhouse Employer | Island Wide | Construction | OM | SO | Sembawang |
| Inhouse Employer | Island Wide | Construction | OM | SSO | Choa Chu Kang |
| Inhouse Employer | Island Wide | Construction | OM | SSS | Jurong East |
| Inhouse Employer | Central | Country Club | OM | CSO | Bukit Batok |
| Inhouse Employer | Central | Country Club | OM | SO | Yishun |
| Inhouse Employer | Central | Country Club | OM | CSO | Bukit Batok |
| Inhouse Employer | Central | Country Club | OM | SS | Choa Chu Kang |
| Inhouse Employer | Central | Country Club | OM | CSO | Bukit Batok |
| Inhouse Employer | Central | Country Club | OM | SS | Bukit Batok |
| Inhouse Employer | Central | Country Club | OM | SS | Sembawang |
| Inhouse Employer | Central | Country Club | OM | SS | Sengkang |
| Inhouse Employer | Central | Country Club | OM | CSO | Bukit Batok |
