| Strive Security Pte Ltd | Island Wide | - | OE | SS | Woodlands |
| Pedro Investigations & Security Services Pte. Ltd. | Central | - | SSO | CSO | Bedok |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | Island Wide | - | OE | SS | Sengkang |
| Orchid Hotel Private Limited | Central | In-House | OM | SSS | Redhill |
| Total Protection Solutions Pte Ltd | Island Wide | - | OM | SO | Tampines |
| Concorde Security Pte Ltd | Central | Commercial | SO | SSO | Redhill |
| Inhouse Employer | Central | In-House | SS | SS | HarbourFront |
| Ranger Investigation & Security Services Pte Ltd | Island Wide | In-House | SS | SS | Woodlands |
| Shine Security Agency Pte Ltd | Island Wide | - | OE | SS | Farrer Park |
| G4S Secure Solutions (Singapore) Pte Ltd | East | In-House | SSO | SSO | Pasir Ris |
| AGS Integration Pte. Ltd. | Island Wide | - | SS | SS | Sembawang |
| Securus Pte Ltd | Island Wide | Commercial | SO | SO | Punggol |
| Aero Asia Security Systems Pte Ltd | Island Wide | - | OE | CSO | Toa Payoh |
| York Hotel (Private) Limited | Central | In-House | OM | CSO | Pasir Ris |
| Union Security Services Pte. Ltd. | North | Commercial | SS | Nil | Hougang |
| Premier Security Co-operative Ltd | Central | Commercial | SS | SS | Toa Payoh |
| Dorsett Singapore | Central | Hotel | SSO | SS | HarbourFront |
| Titanium Safety & Security Pte Ltd | West | Dormitory | SSO | SSO | Bukit Batok |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OE | CSO | Pasir Ris |
| Guthrie FMC Security Pte Ltd | North | Dormitory | SO | SO | Sembawang |
| Soverus Pte Ltd | Island Wide | - | SSS | SS | Choa Chu Kang |
| ProtectPlus Pte Ltd | Island Wide | - | OE | CSO | Pasir Ris |
| TwinRock Global | Central | - | SO | CSO | Bedok |
| Eagle I Security Services Pte Ltd | East | Commercial | SO | SO | Tampines |
| Certis Group | South | Healthcare | SS | SS | Hougang |
