| William Secure Solutions Pte Ltd | Central | Condominium | SS | SO | - |
| First Security & Private Investigation (Singapore) Pte Ltd | North | Condominium | SO | SSO | Woodlands |
| Securus Pte Ltd | Central | Condominium | SS | SO | Bright Hill |
| Sands Global Pte Ltd | Central | Condominium | SS | SS | Khatib |
| Trek Investigations & Security Management Services Pte Ltd | East | Condominium | SO | SO | Lavender |
| Tiger Hong Security Services & Consultants Pte Ltd | West | Condominium | SSO | SO | Tuas Link |
| Kingston Property Maintenance Services Pte Ltd | Central | Condominium | SSO | SSO | - |
| Unique Security Services Pte Ltd | Central | Condominium | SSO | SS | Toa Payoh |
| Chang & Chang Security Management Pte. Ltd. | Central | Condominium | SSO | SS | Toa Payoh |
| Metropolis Security Systems Pte Ltd | Central | Condominium | SSS | CSO | Ang Mo Kio |
| SMS Security | East | Condominium | SO | SO | - |
| AETOS Holdings Pte Ltd | West | Commercial | SSO | SS | Marsiling |
| RAS Security Pte Ltd | Island Wide | Commercial | SSO | SS | Sengkang |
| Primesafe Security & Investigation Pte Ltd | South | Commercial | SS | SSS | Geylang Bahru |
| AETOS Holdings Pte Ltd | West | Commercial | SSO | SS | Marsiling |
| Inhouse Employer at Changi | East | Commercial | OE | SSO | Buangkok |
| Primesafe Security & Investigation Pte Ltd | Island Wide | Commercial | SS | SS | Lavender |
| G4S Secure Solutions (Singapore) Pte Ltd | East | Commercial | SSO | SSO | Tampines |
| Securus Pte Ltd | East | Commercial | SO | SO | Sengkang |
| Reachfield Security & Safety Management Pte Ltd | Island Wide | Commercial | OE | SO | Woodlands |
| Inhouse Employer at Changi | East | Commercial | OE | CSO | Sengkang |
| Inhouse Employer at Changi | East | Commercial | OE | CSO | Sengkang |
| Horus-I Pte Ltd | South | Commercial | SO | SS | Bukit Panjang |
| Inhouse Employer at Changi | East | Commercial | OE | SSS | Pasir Ris |
| Inhouse Employer at Changi | East | Commercial | OE | SSO | Buangkok |
