| Securus Pte Ltd | Island Wide | - | OE | SS | Punggol |
| RAS Security Pte Ltd | North | Commercial | OE | SSS | Bukit Batok |
| RAS Security Pte Ltd | North | Commercial | OE | SSS | Bukit Batok |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| G4S Secure Solutions (Singapore) Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| Soverus Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| Royal Security Management Services Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| Global Ritz Protection (Security Services) Pte Ltd | Island Wide | - | OE | SS | Sengkang |
| Uniforce Security Services Pte Ltd | Island Wide | - | OE | SS | Bukit Batok |
| Inhouse Employer | Island Wide | - | OE | SSS | Toa Payoh |
| Soverus Pte Ltd | Island Wide | - | OE | SSS | Toa Payoh |
| Crowne Plaza Changi Airport | East | In-House | OE | SSS | Toa Payoh |
| Securus Pte Ltd | Island Wide | - | OE | SSS | Toa Payoh |
| Inhouse Employer | Island Wide | - | OE | SSS | Woodlands |
| SATS Ltd | East | - | OE | SSS | Bishan |
| Aero Asia Security Systems Pte Ltd | Island Wide | - | OE | SS | Pasir Ris |
| Force-One Security | North | Data Centre | OE | SS | Pasir Ris |
| Metropolis Security Systems Pte Ltd | Island Wide | - | OE | SS | Pasir Ris |
| Securus Pte Ltd | Island Wide | - | OE | SS | Pasir Ris |
| JEN Singapore Tanglin by Shangri-La | Central | In-House | OE | SS | Pasir Ris |
| Metropolis Security Systems Pte Ltd | Island Wide | - | OE | SSS | Yishun |
| Shine Security Agency Pte Ltd | Island Wide | - | OE | SSS | Bukit Batok |
| Union Security Services Pte. Ltd. | Island Wide | - | OE | SSS | Bukit Batok |
| FormTeam Consultancy Pte Ltd | Island Wide | - | OE | SSS | Bukit Batok |
| Inhouse Employer | Island Wide | - | OE | SS | Sengkang |
