| Metropolis Security Systems Pte Ltd | East | Gov Building | SSO | SS | Aljunied |
| Certis Group | East | Gov Building | SO | SO | Bedok |
| Bulls-Eye Security Services Pte Ltd | South | Gov Building | SO | SO | Hougang |
| Mainguard Security Services Singapore Pte Ltd | Central | Gov Building | SS | SS | Choa Chu Kang |
| Metropolis Security Systems Pte Ltd | East | Gov Building | SO | SO | Kaki Bukit |
| Metropolis Security Systems Pte Ltd | East | Gov Building | SO | SO | Kaki Bukit |
| Metropolis Security Systems Pte Ltd | East | Gov Building | SO | SO | Kaki Bukit |
| Mainguard Security Services Singapore Pte Ltd | Central | Gov Building | SS | SS | Aljunied |
| TwinRock Global | Central | Gov Building | SO | SO | Yishun |
| Securus Pte Ltd | South | Gov Building | SO | SO | - |
| GATES PCM Integrated Services Pte Ltd | Central | Gov Building | SO | SS | Pioneer |
| GATES PCM Integrated Services Pte Ltd | Central | Gov Building | SO | SS | Pioneer |
| Certis Group | East | Gov Building | SO | SS | Simei |
| Royal Security Management Services Pte Ltd | East | Gov Building | SO | SO | Simei |
| Royal Security Management Services Pte Ltd | East | Gov Building | SO | SO | Simei |
| GATES PCM Integrated Services Pte Ltd | Central | Gov Building | SO | SS | Pioneer |
| Royal Security Management Services Pte Ltd | East | Gov Building | SO | SO | Simei |
| GATES PCM Integrated Services Pte Ltd | West | Gov Building | SSO | SSO | Boon Lay |
| GATES PCM Integrated Services Pte Ltd | West | Gov Building | SSO | SSO | Boon Lay |
| Certis Group | East | Gov Building | SO | SO | Pasir Ris |
| Certis Group | East | Gov Building | SO | SO | Sengkang |
| Reachfield Security & Safety Management Pte Ltd | Central | Gov Building | SO | SO | Sengkang |
| 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 |
