| Reachfield Security & Safety Management Pte Ltd | Central | Gov Building | SO | Nil | Jurong East |
| Certis Group | East | Gov Building | SO | SO | Yishun |
| Reachfield Security & Safety Management Pte Ltd | Central | Gov Building | SO | SSO | Tiong Bahru |
| Certis Group | Island Wide | Gov Building | APO | Nil | Yishun |
| C&W Services (S) Pte Ltd | Central | Gov Building | SO | SO | Mountbatten |
| Royal Security Management Services Pte Ltd | East | Gov Building | SO | SO | Pasir Ris |
| Certis Group | Island Wide | Gov Building | APO | SO | Serangoon |
| Reachfield Security & Safety Management Pte Ltd | Central | Gov Building | SO | SO | Pasir Ris |
| Certis Group | East | Gov Building | SO | SO | Bedok |
| Certis Group | East | Gov Building | SO | SO | Bedok |
| FormTeam Consultancy Pte Ltd | South | Events | OE | SS | Sengkang |
| FormTeam Consultancy Pte Ltd | South | Events | OE | SS | Sembawang |
| William Secure Solutions Pte Ltd | Central | Embassy | SSO | SSO | Bukit Batok |
| Ashtree International Pte. Ltd. | West | Dormitory | SO | SO | Bukit Batok |
| Ashtree International Pte. Ltd. | West | Dormitory | SO | SS | Bukit Panjang |
| Premier Security Co-operative Ltd | West | Dormitory | SO | SO | - |
| Labourtel Management Corporation Pte Ltd | West | Dormitory | CSO | SSS | Tampines West |
| Ashtree International Pte. Ltd. | West | Dormitory | SO | SS | Marsiling |
| Ashtree International Pte. Ltd. | West | Dormitory | SO | SS | Marsiling |
| Titanium Safety & Security Pte Ltd | North | Dormitory | SO | SO | Hougang |
| Titanium Safety & Security Pte Ltd | West | Dormitory | SSO | SO | Woodlands |
| Titanium Safety & Security Pte Ltd | West | Dormitory | SSO | SS | Woodlands |
| Titanium Safety & Security Pte Ltd | West | Dormitory | SSO | SSO | Bukit Batok |
| TwinRock Global | North | Dormitory | SO | SO | Yishun |
| Labourtel Management Corporation Pte Ltd | East | Dormitory | CSO | SSS | Tampines West |
