| IOACA LIMITED | | Live |
| IOActive, Limited | Private company limited by shares | Live |
| IOAP HOLDING COMPANY LIMITED | Private company limited by shares | Dissolved |
| IOBLE TECHNOLOGY LIMITED | Private company limited by shares | Live |
| IOCA ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| I-OCEAN LIMITED | Private company limited by shares | Live |
| IOCEAN MICROELECTRONS LIMITED | Private company limited by shares | Live |
| IOCO LIMITED | Private company limited by shares | Dissolved |
| IOCOM LIMITED | Private company limited by shares | Dissolved |
| ioComponents Limited | Private company limited by shares | Dissolved |
| IOCREST TECHNOLOGY LIMITED | Private company limited by shares | Live |
| IOCS Asia Pte Limited | Private company limited by shares | Live |
| IODA LIMITED | | Live |
| IODM (Hong Kong) Limited | Private company limited by shares | Live |
| IOFC (HONG KONG) LIMITED | | Live |
| IOFFICO TECHNOLOGY LIMITED | Private company limited by shares | Live |
| I.O.G.A.D. NGO LIMITED | Private company limited by shares | Live |
| I.O.G.A.D. NGO TRADING & INVESTMENT LIMITED | Private company limited by shares | Live |
| Ioger Limited | Private company limited by shares | Live |
| IOGT (LOGO) LIMITED | Private company limited by shares | Dissolved |
| IOHIN INVESTMENT LIMITED | Private company limited by shares | Live |
| IOII LIMITED | Private company limited by shares | Live |
| IOIO Limited | Private company limited by shares | Live |
| IOIP-INTERNATIONAL ORGANIZATION INTELLECTUAL PROPERTY LIMITED | Private company limited by shares | Dissolved |
| IOKA CO., LIMITED | Private company limited by shares | Live |
| IOKA Electronics. Co., Limited | Private company limited by shares | Live |
| IOKA GROUP LIMITED | | Live |
| IOKA STONE CO., LIMITED | Private company limited by shares | Live |
| IOKONE CO., LIMITED | Private company limited by shares | Live |
| IOLANI GROUP LIMITED | Private company limited by shares | Live |
| IOLEX LIMITED | Private company limited by shares | Live |
| Iolite Limited | Private company limited by shares | Live |
| IOLO LIMITED | Private company limited by shares | Dissolved |
| IOLOGY LIMITED | Private company limited by shares | Live |
| iOlympicU Limited | | Live |
| BGX (IOM) Hong Kong Limited | | Live |
| IOMED LIMITED | | Live |
| I-O-ME-DESIGNERS.COM LIMITED | Private company limited by shares | Live |
| IOMEGA HONG KONG LIMITED | Private company limited by shares | Dissolved |
| ioMio.com Limited | Private company limited by shares | Live |
| IOMV.COM LIMITED | Private company limited by shares | Dissolved |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| IONLINEPAY LIMITED | Private company limited by shares | 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 |
| 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 |
| IOO4THIS LIMITED | Private company limited by shares | Dissolved |
| IOO4U LIMITED | Private company limited by shares | Dissolved |
| iooMobile Limited | Private company limited by shares | Live |
| IOPAY PAYMENT SOLUTIONS LIMITED | Private company limited by shares | Live |
| iOpen Holdings Limited | Private company limited by shares | Live |