| Prospect Protection Pte Ltd | East | Industrial / Factory | SO | SO | Punggol |
| Titanium Safety & Security Pte Ltd | North | Dormitory | SO | SO | Punggol |
| Aigle Security Pte Ltd | Central | Commercial | SO | SO | Punggol |
| G4S Secure Solutions (Singapore) Pte Ltd | South | - | SO | SO | - |
| Inhouse Employer | East | In-House | SO | SO | - |
| Peregrine Security Pte. Ltd. | Central | - | SSO | SO | Bukit Batok |
| Soverus Pte Ltd | South | In-House | SSO | SO | Bukit Batok |
| Securus Pte Ltd | Island Wide | Commercial | SO | SO | Tampines |
| GoMobile Security Solutions Pte Ltd | North | Industrial / Factory | SO | SO | Woodlands |
| First Security & Private Investigation (Singapore) Pte Ltd | South | Commercial | SO | SO | Potong Pasir |
| Total Protection Solutions Pte Ltd | Island Wide | - | OM | SO | Tampines |
| AETOS Holdings Pte Ltd | West | - | SO | SO | Marsiling |
| Titanium Safety & Security Pte Ltd | Island Wide | - | OE | SO | Woodlands |
| SATS Ltd | East | - | OE | SO | Woodlands |
| Chang & Chang Security Management Pte. Ltd. | East | Condominium | SS | SO | Tampines |
| Securus Pte Ltd | Island Wide | Commercial | SO | SO | Tampines |
| Storm Protection Pte Ltd | East | Condominium | SS | SO | Tampines |
| Danmax Security Management Pte Ltd | South | Condominium | SO | SO | - |
| ProtectPlus Pte Ltd | Island Wide | - | OE | SO | Yishun |
| Artyzen Singapore | Central | Hotel | SS | SO | Yishun |
| ProtectPlus Pte Ltd | Island Wide | - | OE | SO | Yishun |
| G4S Secure Solutions (Singapore) Pte Ltd | Central | Retail | SO | SO | - |
| ProtectPlus Pte Ltd | Island Wide | - | OE | SO | Yishun |
| SMS Investigation & Security Pte Ltd | Central | - | OM | SO | Pasir Ris |
| Securus Pte Ltd | Island Wide | Commercial | SO | SO | Tampines |
