| Premier Security Co-operative Ltd | North | Commercial | SO | SO | Yishun |
| Certis Group | North | - | SO | SO | Yishun |
| Securus Pte Ltd | North | Commercial | SO | SO | Yishun |
| Ascentiaa Security Management Pte Ltd | North | Condominium | SO | SO | Yishun |
| Reachfield Security & Safety Management Pte Ltd | South | School | SO | SO | Yishun |
| Guthrie FMC Security Pte Ltd | North | Dormitory | SO | SO | Yishun |
| Elid Technology International Pte Ltd | North | Condominium | SO | SO | Yishun |
| PICO Guards Pte Ltd | North | School | SO | SO | Yishun |
| William Secure Solutions Pte Ltd | East | Condominium | SO | SO | Yishun |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | East | Dormitory | SO | SO | Yishun |
| First Security & Private Investigation (Singapore) Pte Ltd | West | Condominium | SO | SO | Bukit Panjang |
| Elid Technology International Pte Ltd | West | Condominium | SO | SO | Bukit Panjang |
| First Security & Private Investigation (Singapore) Pte Ltd | West | Condominium | SS | SO | Bukit Panjang |
| First Security & Private Investigation (Singapore) Pte Ltd | West | Condominium | SS | SO | Bukit Panjang |
| SMS Investigation & Security Pte Ltd | Central | Commercial | SS | SO | Bukit Panjang |
| Soverus Pte Ltd | North | School | SO | SO | Serangoon |
| Soverus Pte Ltd | North | School | SO | SO | Serangoon |
| Force-One Security | North | Data Centre | SO | SO | Serangoon |
| Inhouse Employer | East | School | SO | SO | Serangoon |
| Reachfield Security & Safety Management Pte Ltd | East | School | SO | SO | Tampines |
| GoMobile Security Solutions Pte Ltd | West | Condominium | SO | SO | Bukit Panjang |
| PICO Guards Pte Ltd | Central | School | SO | SO | Bukit Panjang |
| M Social Singapore | Central | Hotel | OE | SO | Jurong East |
| Trek Investigations & Security Management Services Pte Ltd | Central | Condominium | SO | SO | Bukit Panjang |
| Reachfield Security & Safety Management Pte Ltd | South | School | SO | SO | Aljunied |
