| William Secure Solutions Pte Ltd | East | Condominium | SO | SO | Sengkang |
| William Secure Solutions Pte Ltd | East | Condominium | SO | SO | Sengkang |
| Reachfield Security & Safety Management Pte Ltd | East | School | SO | SO | Sengkang |
| RAS Security Pte Ltd | East | Commercial | SO | SO | Sengkang |
| Concorde Security Pte Ltd | East | Commercial | SO | SO | Sengkang |
| Premier Security Co-operative Ltd | East | Commercial | SO | SO | Sengkang |
| Reachfield Security & Safety Management Pte Ltd | Central | Commercial | SO | SO | Sengkang |
| SMS Investigation & Security Pte Ltd | East | Condominium | SO | SO | Sengkang |
| Certis Group | East | Gov Building | SO | SO | Sengkang |
| Securitas Guarding Services (Singapore) Pte Ltd | East | Data Centre | SO | SSO | Tampines |
| G4S Secure Solutions (Singapore) Pte Ltd | East | School | SO | SS | Punggol |
| G4S Secure Solutions (Singapore) Pte Ltd | East | School | SO | SS | Punggol |
| Certis Group | Island Wide | Commercial | SO | SO | Yishun |
| Certis Group | East | In-House | SO | SO | Pasir Ris |
| Reachfield Security & Safety Management Pte Ltd | East | School | SO | SO | Sengkang |
| Certis Group | East | In-House | SO | SO | Sengkang |
| Reachfield Security & Safety Management Pte Ltd | Central | Gov Building | SO | SO | Sengkang |
| Certis Group | Island Wide | Commercial | SO | SO | Sengkang |
| Certis Group | North | - | SO | SS | Woodlands |
| Inhouse Employer | Central | In-House | SO | SSS | Potong Pasir |
| AETOS Holdings Pte Ltd | West | - | SO | SSO | Ang Mo Kio |
| Guthrie FMC Security Pte Ltd | North | Dormitory | SO | SO | Sembawang |
| Inhouse Employer | West | Industrial / Factory | SO | CSO | - |
| Inhouse Employer | Central | School | SO | CSO | Sengkang |
| Jasa Investigation & Security Services Pte Ltd | East | Industrial / Factory | SO | SO | Yishun |
