| Certis Group | Central | School | SSO | SS | Farrer Park |
| RAS Security Pte Ltd | North | Commercial | OE | SS | Pasir Ris |
| Peregrine Security Pte. Ltd. | Central | - | SSO | SS | Bukit Panjang |
| Securus Pte Ltd | Island Wide | - | OM | SS | Punggol |
| Acestes Pte Ltd | Island Wide | - | OM | SS | Punggol |
| GoMobile Security Solutions Pte Ltd | Island Wide | - | OM | SS | Punggol |
| SATS Ltd | Island Wide | - | OM | SS | Punggol |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OM | SS | Punggol |
| Fervour Pte Ltd | Island Wide | - | OM | SS | Punggol |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | Island Wide | - | OE | SS | Punggol |
| Inhouse Employer | Island Wide | Construction | OM | SS | Tampines |
| Peregrine Security Pte. Ltd. | Central | - | SSO | SS | Geylang Bahru |
| Ademco Security Pte Ltd | Island Wide | - | OE | SS | Geylang Bahru |
| Strive Security Pte Ltd | Island Wide | - | OE | SS | Geylang Bahru |
| Uniforce Security Services Pte Ltd | Island Wide | - | OE | SS | Geylang Bahru |
| GATES PCM Integrated Services Pte Ltd | Central | Gov Building | SO | SS | Pioneer |
| Regal Security & Fire Management Services Pte Ltd | Central | In-House | SSO | SS | Bedok Reservoir |
| RAS Security Pte Ltd | North | Commercial | OE | SS | Bukit Batok |
| Certis Group | Central | Commercial | SO | SS | Bukit Batok |
| AGS Integration Pte. Ltd. | West | In-House | SS | SS | Bukit Batok |
| Metropolis Security Systems Pte Ltd | Island Wide | - | OE | SS | Bukit Batok |
| SECOM Smart (Singapore) Pte. Ltd. | West | Commercial | SSO | SS | Bukit Batok |
| G4S Secure Solutions (Singapore) Pte Ltd | East | Commercial | SSO | SS | Bukit Batok |
| Star Security Services | Island Wide | - | Security Mgt | SS | Bukit Batok |
| Acestes Pte Ltd | Central | - | Security Mgt | SS | Bukit Batok |
