| Certis Group | Island Wide | Gov Building | APO | Nil | Yishun |
| Security Masters Pte Ltd | Island Wide | - | SS | SS | - |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OE | SSS | Tampines |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OM | SSS | Tampines |
| Total Protection Solutions Pte Ltd | Island Wide | - | OM | SSS | Tampines |
| SATS Ltd | Island Wide | - | OM | SSS | Tampines |
| Securus Pte Ltd | Island Wide | - | OM | SSS | Tampines |
| Acestes Pte Ltd | Island Wide | - | OM | SSS | Tampines |
| Uniforce Security Services Pte Ltd | Island Wide | - | OE | SO | Mountbatten |
| Securus Pte Ltd | Island Wide | - | OM | SS | Punggol |
| Aero Asia Security Systems Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| Royal Security Management Services Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| Strive Security Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| Securus Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| PICO Guards Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| Peregrine Security Pte. Ltd. | Island Wide | - | OE | SSS | Sengkang |
| G4S Secure Solutions (Singapore) Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| Overseas (Singapore) Security & Private Investigation Consultants Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| Triple ‘S’ Protection Pte Ltd | Island Wide | - | OE | SSS | Sengkang |
| Reachfield Security & Safety Management Pte Ltd | Island Wide | Commercial | OE | SSS | Sengkang |
| Acestes Pte Ltd | Island Wide | - | OM | Nil | Telok Blangah |
| Total Protection Solutions Pte Ltd | Island Wide | - | OM | Nil | Telok Blangah |
| Certis Group | Island Wide | Commercial | SO | SSO | Pasir Ris |
| Certis Group | Island Wide | Commercial | SO | SSO | Pasir Ris |
| Inhouse Employer | Island Wide | - | OE | SS | Sembawang |
