| SEIKA LIMITED | Private company limited by shares | Dissolved |
| SEIKA ELECTRONICS TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| SEIKA TRADE CO., LIMITED | Private company limited by shares | Live |
| SEIKA ELECTRONICS (HONG KONG) CO., LIMITED | Private company limited by shares | Live |
| FRANCE PIERRE SEIKA (ASIA) EXPANSION LIMITED | Private company limited by shares | Dissolved |
| SEIKA & JO (H.K.) LIMITED | Private company limited by shares | Live |
| YAMAUCHI SEIKA (H.K.) COMPANY LIMITED | Private company limited by shares | Dissolved |
| SEIKA (HONG KONG) CO., LIMITED | Private company limited by shares | Dissolved |
| Hong Kong Seika Industrial Co., Limited | | Live |
| SEIKA HONG KONG LIMITED | Private company limited by shares | Dissolved |
| SEIKA XIANGDA (HONG KONG) COMPANY LIMITED | Private company limited by shares | Live |
| HONGKONG SEIKA CO., LIMITED | Private company limited by shares | Live |
| SEIKA INTERNATIONAL CO., LIMITED | Private company limited by shares | Live |
| Seika International Trading Co., Limited | Private company limited by shares | Live |
| JAPAN SEIKA COMPANY LIMITED | Private company limited by shares | Dissolved |
| SEIKARA CO., LIMITED | Private company limited by shares | Live |