| 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 |
| PICO Guards Pte Ltd | North | Industrial / Factory | SS | SS | Bukit Panjang |
| Excellent Security & Safety Pte Ltd | Central | Industrial / Factory | SS | SS | Hougang |
| PICO Guards Pte Ltd | North | Industrial / Factory | SSO | SS | Woodlands |
| Peregrine Security Pte. Ltd. | North | Industrial / Factory | SSO | SS | Woodlands |
| Prosegur Singapore Pte Ltd | East | Industrial / Factory | SO | SO | Kaki Bukit |
| Excellent Security & Safety Pte Ltd | Central | Industrial / Factory | SSO | SSO | Toa Payoh |
| Hawkeye Security Solutions Pte Ltd | West | Industrial / Factory | SS | SS | Bukit Panjang |
| IGC Security Services Pte Ltd | South | Industrial / Factory | SSO | SS | Tiong Bahru |
| Eagle I Security Services Pte Ltd | East | Industrial / Factory | SO | SO | Pasir Ris |
| G4S Secure Solutions (Singapore) Pte Ltd | West | Industrial / Factory | SS | SS | Pioneer |
| Royal Security Management Services Pte Ltd | North | Industrial / Factory | SO | SSO | Woodlands |
| SMS Security | Central | Industrial / Factory | SO | SSO | Tanjong Pagar |
