| William Secure Solutions Pte Ltd | Central | Condominium | SO | SS | Farrer Park |
| William Secure Solutions Pte Ltd | Central | Hotel | SO | SSO | - |
| Eagle I Security Services Pte Ltd | East | Commercial | SO | SSO | - |
| Dragnet Smartech Security Pte Ltd | Island Wide | Commercial | SO | SSO | - |
| RAS Security Pte Ltd | East | Commercial | SO | SO | Tampines |
| Certis Group | East | - | SO | SS | Simei |
| Union Security Services Pte Ltd | North | Healthcare | SO | SO | Woodlands South |
| Acestes Pte Ltd | East | Condominium | SO | SSO | Sengkang |
| Certis Group | East | Gov Building | SO | SS | Simei |
| G4S Secure Solutions (Singapore) Pte Ltd | South | Commercial | SO | Nil | Kembangan |
| Premier Security Co-operative Ltd | East | Commercial | SO | SO | Simei |
| Royal Security Management Services Pte Ltd | East | Gov Building | SO | SO | Simei |
| Premier Security Co-operative Ltd | East | Commercial | SO | SO | Simei |
| Unique Security Services Pte Ltd | East | Condominium | SO | SO | Simei |
| Metropolis Security Systems Pte Ltd | East | Commercial | SO | SO | Simei |
| King's Security and Safety Management Pte Ltd | East | Commercial | SO | SO | Simei |
| Uniforce Security Services Pte Ltd | East | Commercial | SO | SO | Simei |
| Jasa Investigation & Security Services Pte Ltd | East | Commercial | SO | SO | Simei |
| G4S Secure Solutions (Singapore) Pte Ltd | East | Commercial | SO | SO | Simei |
| Concorde Security Pte Ltd | East | School | SO | SO | Simei |
| Union Security Services Pte. Ltd. | East | Data Centre | SO | SO | Simei |
| Prosec Services Pte Ltd | East | Data Centre | SO | SO | Simei |
| William Secure Solutions Pte Ltd | East | Healthcare | SO | SO | Simei |
| Royal Security Management Services Pte Ltd | East | Gov Building | SO | SO | Simei |
| Force-One Security | Central | Commercial | SO | CSO | Pasir Ris |
