| 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 |
| Fervour Pte Ltd | North | Healthcare | SSO | SSO | Admiralty |
| Mainguard Security Services (S) Pte Ltd | East | Healthcare | SSO | SO | Pasir Ris |
| Certis Group | South | Healthcare | SS | SO | Bukit Panjang |
| Certis Group | South | Healthcare | SS | SS | Bukit Panjang |
| Peregrine Security Pte. Ltd. | North | Healthcare | SSO | SSO | Ang Mo Kio |
| William Secure Solutions Pte Ltd | East | Healthcare | SO | SO | Hougang |
| Peregrine Security Pte. Ltd. | North | Healthcare | SO | SO | Ang Mo Kio |
| Inhouse Employer | Central | Healthcare | OE | SS | Hougang |
| Inhouse Employer | Central | Healthcare | OE | SS | Sembawang |
| Peregrine Security Pte. Ltd. | North | Healthcare | SSO | SS | Yishun |
| Peregrine Security Pte. Ltd. | North | Healthcare | SSO | SS | Yishun |
| Eagle I Security Services Pte Ltd | Central | Healthcare | SO | SO | Hougang |
| Eagle I Security Services Pte Ltd | Central | Healthcare | SO | SO | Hougang |
| Global Ritz Protection (Security Services) Pte Ltd | Central | Healthcare | SSO | SSO | Bukit Batok |
| Inhouse Employer | Central | Healthcare | OE | SS | Sengkang |
| Certis Group | South | Healthcare | SS | SS | Admiralty |
| Bulls-Eye Security Services Pte Ltd | Central | Healthcare | SSS | SSS | Aljunied |
| Excellent Security & Safety Pte Ltd | East | Healthcare | SSO | SSO | Pasir Ris |
