| OSTACA INDUSTRY & TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| OSTADI TRADING CO., LIMITED | Private company limited by shares | Dissolved |
| OSTAFER LIMITED | Private company limited by shares | Dissolved |
| Ostanern International Limited | Private company limited by shares | Dissolved |
| OSTANI LIMITED | Private company limited by shares | Dissolved |
| OSTAR LIMITED | | Live |
| OSTARA COMPANY LIMITED | | Live |
| OSTAS LIMITED | Private company limited by shares | Dissolved |
| STAIB OSTASIEN COMPANY LIMITED | Private company limited by shares | Live |