| Certis Group | Central | Commercial | SO | SSO | Choa Chu Kang |
| Force-One Security | Central | Commercial | SO | SO | Yishun |
| Certis Group | Central | Commercial | SO | SSO | Choa Chu Kang |
| GATES PCM Integrated Services Pte Ltd | Central | Gov Building | SO | SS | Pioneer |
| G4S Secure Solutions (Singapore) Pte Ltd | North | School | SO | SO | Bras Basah |
| Inhouse Employer | West | Industrial / Factory | SO | SO | Bras Basah |
| G4S Secure Solutions (Singapore) Pte Ltd | Central | School | SO | SO | Bras Basah |
| Inhouse Employer | South | In-House | SO | SO | Bras Basah |
| Inhouse Employer | Central | Hotel | SO | SO | Bras Basah |
| PICO Guards Pte Ltd | North | Industrial / Factory | SO | SO | Bras Basah |
| Certis Group | Central | Commercial | SO | SS | Bukit Batok |
| Fervour Pte Ltd | West | School | SO | SO | Bras Basah |
| PICO Guards Pte Ltd | East | Industrial / Factory | SO | SS | Punggol |
| Inhouse Employer | North | Commercial | SO | SSO | Choa Chu Kang |
| First Security & Private Investigation (Singapore) Pte Ltd | North | Industrial / Factory | SO | SO | Potong Pasir |
| Horus I (Private Limited) | South | Retail | SO | SO | Pasir Ris |
| Horus I (Private Limited) | South | Retail | SO | SO | Pasir Ris |
| GoMobile Security Solutions Pte Ltd | North | Industrial / Factory | SO | SSO | Sembawang |
| SMS Investigation & Security Pte Ltd | Central | Commercial | SO | SO | Serangoon |
| Strive Security Pte Ltd | West | Dormitory | SO | SSO | Choa Chu Kang |
| G4S Secure Solutions (Singapore) Pte Ltd | South | - | SO | SO | Bras Basah |
| Inhouse Employer | West | Industrial / Factory | SO | SO | Sembawang |
| Horus I (Private Limited) | North | Retail | SO | SO | Tampines |
| Certis Group | Central | Commercial | SO | SS | Bukit Batok |
| Brink's Singapore Pte Ltd | East | - | SO | SO | Pasir Ris |
