| ISYS SOLUTION LIMITED | Private company limited by shares | Live |
| I-SYSTEM LIMITED | Private company limited by shares | Dissolved |
| I-SYSTEM & CONSULTANCY COMPANY LIMITED | Private company limited by shares | Dissolved |
| ISYSTEM MICRO LIMITED | Private company limited by shares | Live |
| I-SYSTEM TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| i-System Technology Limited | Private company limited by shares | Live |
| CYBERBASE ISYSTEMS LIMITED | Private company limited by shares | Dissolved |
| iSystems Asia Pacific Limited | Private company limited by shares | Live |
| iSystems Security Limited | Private company limited by shares | Live |
| ISYSTS Company Limited | Private company limited by shares | Live |