| ONWOOD ENTERPRISES LIMITED | Private company limited by shares | Live |
| ONWOOD INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| ONWOOD INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ONWOOD INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| ONWORK INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| ONWORLD COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONWORLD LIMITED | Private company limited by shares | Live |
| ONWORLD ASIA LIMITED | Private company limited by shares | Dissolved |
| ONWORLD ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| ONWORLD ENTERPRISE LIMITED | Private company limited by shares | Live |
| ONWORLD INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| ONWORLD FAMILY OFFICE (HONG KONG) COMPANY LIMITED | | Live |
| ONYAN INTERNATIONAL PROPERTIES INVESTMENT GROUP LIMITED | Private company limited by shares | Live |
| BRITAIN ONYANGO GROUP TRADING LIMITED | Private company limited by shares | Live |
| ONYARD PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| ONYAT INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ONYAT YARN COMPANY LIMITED | Private company limited by shares | Dissolved |
| ON-YET COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONYI INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| ONYIELD LIMITED | Private company limited by shares | Dissolved |
| ONYIELD LIMITED | Private company limited by shares | Dissolved |
| ONYIELD COMPUTER LIMITED | Private company limited by shares | Dissolved |
| ONYIELD MANAGEMENT LIMITED | Private company limited by shares | Live |
| ONYIN INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| HONG KONG ONYIN HEALTH PRODUCTS CO. LIMITED | Private company limited by shares | Dissolved |
| Onylis Trading Limited | | Live |
| ONYO ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| ONYORK LIMITED | Private company limited by shares | Dissolved |
| ONYORK LIMITED | Private company limited by shares | Dissolved |
| ONYORK LIMITED | Private company limited by shares | Live |
| ONYORK DEVELOPMENT LIMITED | Private company limited by shares | Live |
| ONYORK INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| ON-YOUNG LIMITED | Private company limited by shares | Dissolved |
| ONYUN LIMITED | Private company limited by shares | Dissolved |
| ONYUN INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| Onyva Limited | Private company limited by shares | Live |
| ONYX LIMITED | Private company limited by shares | Live |
| ONYX IDS LIMITED | | Live |
| ONYX ASIA LIMITED | Private company limited by shares | Live |
| Onyx Diamonds Asia Limited | Private company limited by shares | Live |
| ONYX CAPITAL LIMITED | Private company limited by shares | Live |
| ONYX CAPITAL LIMITED | Private company limited by shares | Live |
| ONYX CONTAINERS LIMITED | | Live |
| ONYX DIMENSIONS LIMITED | Private company limited by shares | Dissolved |
| Onyx Enterprise Limited | Private company limited by shares | Live |
| ONYX ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| GREEN ONYX LIMITED | Private company limited by shares | Live |
| ONYX HealthCare Limited | Private company limited by shares | Live |
| ONYX INCORPORATED LIMITED | Private company limited by shares | Live |
| ONYX INVESTMENT LIMITED | Private company limited by shares | Live |
| QUALITY ONYX LIMITED | Private company limited by shares | Live |
| SILVER ONYX LIMITED | Private company limited by shares | Dissolved |
| Onyx Solutions Limited | Private company limited by shares | Live |
| Onyx Systems Limited | Private company limited by shares | Live |
| Onyxcina Limited | Private company limited by shares | Live |
| ONYX-FURUKAWA INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| Onyxslate Limited | | Live |
| ROUTE ONZE LIMITED | Private company limited by shares | Live |
| SUPER ONZE LIMITED | Private company limited by shares | Dissolved |
| ONZIAN TRADING LIMITED | | Live |
| ONZIT INTERNATIONAL (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| ONZONE LIMITED | | Live |
| ONZTON JEWELLERY LIMITED | Private company limited by shares | Live |