| Inhouse Employer | Central | Mix-Development | Security Mgt | SSS | Pioneer |
| Reachfield Security & Safety Management Pte Ltd | Island Wide | - | Security Mgt | SSO | Simei |
| SATS Ltd | Island Wide | - | OM | SSS | Woodlands |
| First Security & Private Investigation (Singapore) Pte Ltd | West | Condominium | SSO | SSO | Bukit Batok |
| G4S Secure Solutions (Singapore) Pte Ltd | Central | Retail | SO | SO | - |
| SMS Security | Central | Industrial / Factory | SO | SO | Potong Pasir |
| Pan Pacific Singapore | South | In-House | Security Mgt | SSO | Simei |
| Union Security Services Pte. Ltd. | East | Data Centre | SS | SO | Woodlands |
| Uniforce Security Services Pte Ltd | Central | Condominium | SS | SS | - |
| G4S Secure Solutions (Singapore) Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| Certis Group | East | In-House | SO | SO | Sengkang |
| SMS Security | East | Mix-Development | SSO | SS | Aljunied |
| Security & Risk Solutions Pte. Ltd. | Central | - | Office Team | SSS | Punggol |
| Grand Copthorne Waterfront Hotel | Central | In-House | Security Mgt | SSS | Tampines West |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OM | SSS | Tampines |
| Prosegur Singapore Pte Ltd | South | Commercial | SSS | SSS | Queenstown |
| Shine Security Agency Pte Ltd | Island Wide | - | OE | SSS | Toa Payoh |
| G4S Secure Solutions (Singapore) Pte Ltd | South | - | SO | SO | Punggol |
| Young Women's Christian Association of Singapore | Central | In-House | SO | SS | Aljunied |
| G4S Secure Solutions (Singapore) Pte Ltd | Central | In-House | SSO | SS | Bukit Batok |
| G4S Secure Solutions (Singapore) Pte Ltd | Central | In-House | SSO | SSO | Pasir Ris |
| First Security & Private Investigation (Singapore) Pte Ltd | North | Condominium | SO | SSO | Woodlands |
| Titanium Safety & Security Pte Ltd | Island Wide | - | OE | CSO | Marsiling |
| Aedge Services Pte Ltd | Island Wide | - | OM | SS | Pioneer |
| GoMobile Security Solutions Pte Ltd | Island Wide | - | OM | SSS | Sengkang |
