| TwinRock Global | West | Industrial / Factory | SO | SO | Boon Lay |
| Soverus Pte Ltd | West | Industrial / Factory | SO | SSS | Jurong East |
| Pedro Investigations & Security Services Pte. Ltd. | Central | Industrial / Factory | SO | SS | Sengkang |
| Ademco Security Pte Ltd | East | Industrial / Factory | SS | SS | Tampines |
| Ademco Security Pte Ltd | East | Industrial / Factory | SS | SS | Tampines |
| Inhouse Employer | North | Industrial / Factory | SSO | SSS | Marsiling |
| Regal Security & Fire Management Services Pte Ltd | West | Industrial / Factory | SO | SO | Choa Chu Kang |
| Regal Security & Fire Management Services Pte Ltd | West | Industrial / Factory | SO | SO | Choa Chu Kang |
| Elitez Security Pte Ltd | West | Industrial / Factory | SO | SO | Choa Chu Kang |
| Union Security Services Pte Ltd | North | Industrial / Factory | SSO | SSO | Ang Mo Kio |
| Metropolis Security Systems Pte Ltd | West | Industrial / Factory | SO | SO | Choa Chu Kang |
| Jasa Investigation & Security Services Pte Ltd | East | Industrial / Factory | SO | SO | Hougang |
| Union Security Services Pte Ltd | North | Industrial / Factory | SSO | SSO | Sengkang |
| Prospect Protection Pte Ltd | West | Industrial / Factory | SS | SS | Tuas Link |
| Jasa Investigation & Security Services Pte Ltd | East | Industrial / Factory | SO | SO | Hougang |
| Ranger Investigation & Security Services Pte Ltd | East | Industrial / Factory | SO | SO | Hougang |
| G4S Secure Solutions (Singapore) Pte Ltd | West | Industrial / Factory | SS | SSS | Jurong East |
| Ranger Investigation & Security Services Pte Ltd | East | Industrial / Factory | SO | SO | Hougang |
| Peregrine Security Pte. Ltd. | North | Industrial / Factory | SSO | SO | Woodlands |
| PICO Guards Pte Ltd | North | Industrial / Factory | SS | SO | Woodlands |
| Peregrine Security Pte. Ltd. | North | Industrial / Factory | SSO | SS | Woodlands |
| PICO Guards Pte Ltd | North | Industrial / Factory | SSO | SS | Woodlands |
| Storm Protection Pte Ltd | West | Industrial / Factory | SS | SS | Bukit Panjang |
| Excellent Security & Safety Pte Ltd | East | Industrial / Factory | SSO | SSO | Bukit Batok |
| Prosegur Singapore Pte Ltd | East | Industrial / Factory | SO | SO | Kaki Bukit |
