| MASTERPIECE VACUUM (ION) PLATING LIMITED | Private company limited by shares | Live |
| YIDETONG VACUUM (ION) PLATING LIMITED | Private company limited by shares | Live |
| IONA Limited | | Live |
| IONA INVESTMENTS LIMITED | Private company limited by shares | Live |
| IONA TRADING LIMITED | Private company limited by shares | Dissolved |
| Ionada Limited | Private company limited by shares | Dissolved |
| IONAPAY LIMITED | | Live |
| IONARC SMELTERS (O'SEAS) LIMITED | Private company limited by shares | Dissolved |
| I-ONASIA LIMITED | Private company limited by shares | Live |
| MAXIMA'S I-ONASIA LIMITED | Private company limited by shares | Dissolved |
| I-ONE LIMITED | Private company limited by shares | Live |
| IONETIX ASIA LIMITED | Private company limited by shares | Live |
| IONG ON LIMITED | Private company limited by shares | Dissolved |
| Iongentherapeutics Limited | | Live |
| HONGDA INTERNATIONAL (HONGKONG) CAR IONGPHIN LIMITED | Private company limited by shares | Dissolved |
| IONI GROUP LIMITED | Private company limited by shares | Live |
| IONIA LIMITED | Private company limited by shares | Dissolved |
| Ionia Bag Co., Limited | Private company limited by shares | Live |
| IONIA SHIPPING LIMITED | Private company limited by shares | Dissolved |
| IONiaga Limited | Private company limited by shares | Live |
| Ionian Investments Limited | Private company limited by shares | Live |
| Ionian Spirit Shipping Limited | | Live |
| IONIC LIMITED | Private company limited by shares | Live |
| IONIC MERCANTILE LIMITED | Private company limited by shares | Dissolved |
| IONIC POWER LIMITED | Private company limited by shares | Live |
| IONICSWIFT LIMITED | | Live |
| IONICTECH LIMITED | Private company limited by shares | Live |
| IONIDES LIMITED | Private company limited by shares | Dissolved |
| IONION LIMITED | Private company limited by shares | Live |
| IONISAT ASIA LIMITED | Private company limited by shares | Dissolved |
| IONITEX Limited | | Live |
| IONIX LIMITED | Private company limited by shares | Dissolved |
| IONIZAIR LIMITED | Private company limited by shares | Live |
| SEAWISE IONIZATION TECHNOLOGY LIMITED | Private company limited by shares | Live |
| IONIZED CO., LIMITED | Private company limited by shares | Live |
| IONIZED POWER COMPANY LIMITED | Private company limited by shares | Live |
| IonLife Holding Limited | | Live |
| IONLINEPAY LIMITED | Private company limited by shares | Live |
| IONLUXES LIMITED | | Live |
| IONMAN (HK) LIMITED | Private company limited by shares | Live |
| IONMAN (HK) LIMITED | Private company limited by shares | Live |
| IONMAN HOLDING (HK) LIMITED | Private company limited by shares | Live |
| IONMAN INTERNATIONAL ASIA LIMITED | Private company limited by shares | Live |
| ionman Tuen Mun Limited | Private company limited by shares | Live |
| IONOSPHERE HK LIMITED | Private company limited by shares | Dissolved |
| Ionosphere Limited | Private company limited by shares | Live |
| IONOVA Limited | Private company limited by shares | Live |
| CHANG AN VACUUM ION-PLATING COMPANY LIMITED | Private company limited by shares | Live |
| HI-TECH VACUUM ION-PLATING LIMITED | Private company limited by shares | Dissolved |
| IonplusTech Co., Limited | | Live |
| IONS INTERNATIONAL (HK) CO., LIMITED | Private company limited by shares | Live |
| Ions Direct (HK) Limited | Private company limited by shares | Dissolved |
| ION'S HOLDING LIMITED | Private company limited by shares | Live |
| NEGATIVE IONS CENTRE LIMITED | Private company limited by shares | Dissolved |
| IONSON TRADING CO., LIMITED | Private company limited by shares | Live |
| IonTech Limited | | Live |
| I-on-Technology Limited | Private company limited by shares | Live |
| IONTRACK LIMITED | Private company limited by shares | Dissolved |
| Iontronics Limited | Private company limited by shares | Live Commenced dormancy on 26-Oct-2015 |
| IONYX GLOBAL LIMITED | Private company limited by shares | Live |
| I-ONYX (HK) LIMITED | Private company limited by shares | Dissolved |