| HI-OAK COMPANY LIMITED | Private company limited by shares | Dissolved |
| Hi-Octane Holding Limited | Private company limited by shares | Live |
| HiODZ Limited | Private company limited by shares | Live |
| HIOH HAIR PRODUCTS LIMITED | Private company limited by shares | Dissolved |
| Hioki (H.K.) Limited | Private company limited by shares | Dissolved |
| HONG KONG HIOKI LIMITED | Private company limited by shares | Live |
| HIOKI INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| HIOKI INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| HIOKI INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| HIOLUX TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Hiomedia Limited | | Live |
| HIOMNI LIMITED | Private company limited by shares | Dissolved |
| HIONEONE INTERNET TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| JUNG HIONG COMPANY LIMITED | Private company limited by shares | Dissolved |
| Hionic Energy Development Investments Limited | Private company limited by shares | Live |
| ECHO COMPUTER HI-ORGANIZATION COMPANY LIMITED | Private company limited by shares | Dissolved |
| HIOTA LIMITED | Private company limited by shares | Live |
| HiOX Group (Hong Kong) Limited | | Live |