| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | West | Dormitory | SO | SO | Bukit Gombak |
| SATS Ltd | Island Wide | - | OM | CSO | Boon Lay |
| Fervour Pte Ltd | West | School | SO | SO | Bras Basah |
| Jasa Investigation & Security Services Pte Ltd | East | Industrial / Factory | SO | SO | Hougang |
| Premier Security Co-operative Ltd | East | Commercial | SSO | SSO | Pasir Ris |
| William Secure Solutions Pte Ltd | South | Condominium | SO | SO | Mountbatten |
| Chang & Chang Security Management Pte. Ltd. | East | Condominium | SS | SS | Tampines |
| Acestes Pte Ltd | Island Wide | - | OM | SSS | Sengkang |
| G4S Secure Solutions (Singapore) Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| Titanium Safety & Security Pte Ltd | North | In-House | SSO | SSO | Jurong East |
| GoMobile Security Solutions Pte Ltd | West | Industrial / Factory | SSO | SO | Lakeside |
| G4S Secure Solutions (Singapore) Pte Ltd | East | In-House | SSO | SSO | - |
| Peregrine Security Pte. Ltd. | Island Wide | - | OE | SSS | Bedok |
| Securus Pte Ltd | Island Wide | - | OE | SSS | Bukit Batok |
| Inhouse Employer | Central | Healthcare | OE | SS | Kaki Bukit |
| Union Security Services Pte. Ltd. | West | Condominium | SS | SS | Bukit Panjang |
| PICO Guards Pte Ltd | North | Data Centre | SS | SS | Ang Mo Kio |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OE | SSS | Bukit Panjang |
| Reachfield Security & Safety Management Pte Ltd | Central | School | Security Mgt | SSS | Tiong Bahru |
| Union Security Services Pte. Ltd. | East | Data Centre | SS | SS | Woodlands |
| Acestes Pte Ltd | Island Wide | - | OM | Nil | Bukit Gombak |
| FormTeam Consultancy Pte Ltd | Island Wide | - | OE | SS | Sengkang |
| Royal Security Management Services Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| Premier Security Co-operative Ltd | Island Wide | - | SS | SS | Bukit Panjang |
| Soverus Pte Ltd | Central | Data Centre | SSS | CSO | Toa Payoh |
