| Oisac Holding Limited | Private company limited by shares | Live |
| Oisaka Co., Limited | Private company limited by shares | Live |
| ESSAN & OISHI HK LIMITED | | Live |
| OISHI TABEMONO LIMITED | Private company limited by shares | Live |
| OISHII LIMITED | Private company limited by shares | Dissolved |
| Oishii Limited | Private company limited by shares | Dissolved |
| Oishii Don Limited | Private company limited by shares | Live |
| Oishii Jewelry Limited | Private company limited by shares | Dissolved |
| Oi-Shi-Sushi Limited | Private company limited by shares | Live |
| Oi-Shi-Sushi Group Limited | Private company limited by shares | Live |
| Oi-Shi-Sushi (Tai Po) Limited | Private company limited by shares | Live |
| Oisix Hong Kong Company Limited | Private company limited by shares | Live |
| Oiss Brand Limited | | Live |
| ITALY OISTON (H.K.) GROUP LIMITED | Private company limited by shares | Dissolved |
| Oisum Insurance Co., Limited | Private company limited by shares | Dissolved |