| Metropolis Security Systems Pte Ltd | Central | Industrial / Factory | SO | SSO | Commonwealth |
| Metropolis Security Systems Pte Ltd | Central | Industrial / Factory | SO | SSO | Commonwealth |
| Reachfield Security & Safety Management Pte Ltd | West | Industrial / Factory | SS | CSO | Toa Payoh |
| Inhouse Employer | West | Industrial / Factory | SO | SSS | Marsiling |
| Inhouse Employer | West | Industrial / Factory | SO | SSS | Marsiling |
| Reachfield Security & Safety Management Pte Ltd | Island Wide | Industrial / Factory | SSS | SSO | Simei |
| PICO Guards Pte Ltd | North | Industrial / Factory | SS | SS | Woodlands |
| Inhouse Employer | West | Industrial / Factory | SO | CSO | - |
| Jasa Investigation & Security Services Pte Ltd | East | Industrial / Factory | SO | SO | Yishun |
| Ademco Security Pte Ltd | West | Industrial / Factory | SSO | SO | Jurong East |
| Reachfield Security & Safety Management Pte Ltd | West | Industrial / Factory | SS | SS | Admiralty |
| Inhouse Employer | West | Industrial / Factory | SO | CSO | Boon Lay |
| Trek Investigations & Security Management Services Pte Ltd | West | Industrial / Factory | SO | Nil | Jurong East |
| Jasa Investigation & Security Services Pte Ltd | West | Industrial / Factory | SSO | SSO | - |
| Prospect Protection Pte Ltd | West | Industrial / Factory | SS | SS | - |
| Global Ritz Protection (Security Services) Pte Ltd | West | Industrial / Factory | SS | SS | - |
| Inhouse Employer | West | Industrial / Factory | SO | SSO | Bukit Gombak |
| Jasa Investigation & Security Services Pte Ltd | West | Industrial / Factory | SSO | SSO | Tuas Link |
| Peregrine Security Pte. Ltd. | West | Industrial / Factory | SSO | SSO | Tuas Link |
| ESA Security Pte Ltd | West | Industrial / Factory | SSO | SSO | Tuas Link |
| Inhouse Employer | West | Industrial / Factory | SO | SSO | Tuas Link |
| Union Security Services Pte. Ltd. | Central | Industrial / Factory | SS | SSS | Yishun |
| Reachfield Security & Safety Management Pte Ltd | North | Industrial / Factory | SS | SSS | Yishun |
| Inhouse Employer | West | Industrial / Factory | SO | SS | Woodlands |
| Soverus Pte Ltd | Central | Industrial / Factory | SS | SS | Punggol |
