| VAN OORD ACZ ASIA LIMITED | Private company limited by shares | Dissolved |
| OOSH LIMITED | Private company limited by shares | Live |
| OOSHIRO SHIPPING COMPANY LIMITED | Private company limited by shares | Dissolved |
| OOSIC LIMITED | Private company limited by shares | Live |
| OOSS HK PTE LIMITED | Private company limited by shares | Live |
| Oostende Investment Company Limited | Private company limited by shares | Live |
| O.O.T. LIMITED | Private company limited by shares | Dissolved |
| OO-T INT'L CO., LIMITED | Private company limited by shares | Dissolved |
| OOTAKI COMPANY LIMITED | Private company limited by shares | Live |
| OOTDY HK CO., LIMITED | | Live |
| OOTEE LIMITED | Private company limited by shares | Live |
| Ootheca HK Limited | Private company limited by shares | Live |
| OOTOO (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| OOTORII (HONG KONG) COMPANY LIMITED | Private company limited by shares | Live |
| Ootoya Limited | Private company limited by shares | Dissolved |
| HONG KONG OOTOYA CO., LIMITED | Private company limited by shares | Live |
| Ooty Limited | Private company limited by shares | Live |
| Oovao Powers Limited | Private company limited by shares | Live |
| OOWL TECH LIMITED | Private company limited by shares | Live |
| OOZE CO LIMITED | Private company limited by shares | Dissolved |
| Oozing Forest Limited | | Live |
| OOZO LIMITED | Private company limited by shares | Live |
| OOZOO Limited -THE- | Private company limited by shares | Live |
| OOZOO HK Limited | Private company limited by shares | Live |
| OOZOU LIMITED | Private company limited by shares | Live |