| SEIA CO., LIMITED | Private company limited by shares | Dissolved |
| SEIA FASHION CO., LIMITED | Private company limited by shares | Live |
| ITC Seian Investment LIMITED | Private company limited by shares | Live |
| SEIBER REGENT INVESTMENT LIMITED | Private company limited by shares | Live |
| SEIBERT LIMITED | Private company limited by shares | Dissolved |
| Seibi group Limited | Private company limited by shares | Live |
| SEIBOW LIMITED | Private company limited by shares | Dissolved |
| SEIBU MAX LIMITED | Private company limited by shares | Live |
| SEIC (HK) LIMITED | Private company limited by shares | Dissolved |
| SEICANE ELECTRONICS LIMITED | Private company limited by shares | Live |
| SEICHEUNGTONG PHARMACEUTICAL CO., LIMITED | Private company limited by shares | Live |
| Seicho Limited | Private company limited by shares | Live |
| SEICLE COMPANY LIMITED | Private company limited by shares | Dissolved |
| SeiClini Limited | Private company limited by shares | Live |
| SEICO COMPANY LIMITED | Private company limited by shares | Dissolved |
| SEICON ENTERPRISES (H.K.) LIMITED | Private company limited by shares | Dissolved |
| Seicosy (HK) Trade Co., Limited | Private company limited by shares | Live |
| SEICREDIT SHIPPING LIMITED | Private company limited by shares | Dissolved |
| HONGKONG SEICRONWEI TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| SEIDAN LIMITED | Private company limited by shares | Live |
| CHINA SEIDE HANDELSGESELLSCHAFT FUR TEXTILIEN UND KUNSTHANDWERK LIMITED | Private company limited by shares | Dissolved |
| Seidel Limited | Private company limited by shares | Live |
| SEIDENKO ASIA LIMITED | Private company limited by shares | Dissolved |
| SEIDES LIMITED | Private company limited by shares | Live |
| Seidl Instrument (China) Co., Limited | Private company limited by shares | Live |
| SEIDO LIMITED | Private company limited by shares | Dissolved |
| SEIDO LIMITED | Private company limited by shares | Live |
| SEIDO ENTERPRISES LIMITED | Private company limited by shares | Live |
| SEIDO TEXTILES LIMITED | Private company limited by shares | Dissolved |
| OURUISI INTERNATIONAL PHOTOELECTRICTY SEIENCE TECHNOLOGY RESEARCH LIMITED | Private company limited by shares | Live |
| SEIF ASIA LIMITED | Private company limited by shares | Live |
| SEIFCO COMPANY LIMITED | Private company limited by shares | Live |
| Seifert Investment Holding Limited | Private company limited by shares | Live |
| SEIGAKUDO LIMITED | Private company limited by shares | Live |
| Seige Communication Limited | Private company limited by shares | Live |
| SEIGEER LIMITED | | Live |
| DE SEIGNALT LIMITED | Private company limited by shares | Live |
| SEIGNIOR LIMITED | Private company limited by shares | Dissolved |
| SEIGNIOR (HK) DEVELOPMENT COMPANY LIMITED | Private company limited by shares | Dissolved |
| SEIGNIOR INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| Seigniorage Capital Limited | Private company limited by shares | Live |
| SEIGNIORY INTERNATIONAL (GROUP) CO., LIMITED | Private company limited by shares | Dissolved |
| Seigo Engineering Company Limited | Private company limited by shares | Live |
| SEIHEIKI LIMITED | Private company limited by shares | Live |
| SEIHO LIMITED | Private company limited by shares | Dissolved |
| Seiiki Holding Limited | Private company limited by shares | Live |
| SEIINK LIMITED | Private company limited by shares | Live |
| SEIJI ENTERPRISES COMPANY LIMITED | Private company limited by shares | Dissolved |
| Seijitsu Capital Limited | Private company limited by shares | Live |
| SEIK TRADING LIMITED | Private company limited by shares | Live |
| 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 |
| SEIKE COMPANY LIMITED | Private company limited by shares | Live |
| SEIKEN COMPANY LIMITED | Private company limited by shares | Dissolved |
| SEIKEN INVESTMENT CO. LIMITED -THE- | Private company limited by shares | Dissolved |
| YK SEIKI LIMITED | Private company limited by shares | Dissolved |
| Seiki Electronics Technology HK Co., Limited | Private company limited by shares | Live |
| HK HONRIC SEIKI GROUP CO., LIMITED | Private company limited by shares | Live |
| HONG KONG MOGAMI SEIKI CO., LIMITED | Private company limited by shares | Dissolved |
| NANSHIN SEIKI (HONG KONG) CO., LIMITED | Private company limited by shares | Live |
| TANGE SEIKI HONG KONG CO., LIMITED | Private company limited by shares | Live |
| SEIKI Digital Company Limited | Private company limited by shares | Live |
| Fujida Seiki Enterprise Co., Limited | Private company limited by shares | Live |
| HI-TECH SEIKI ENTERPRISE CO. LIMITED | Private company limited by shares | Dissolved |
| YOSHIDA SEIKI F.A. ENGINEERING (HK) LIMITED | Private company limited by shares | Live |
| CHINA SEIKI GROUP CO., LIMITED | Private company limited by shares | Dissolved |
| Y K SEIKI (HK) LIMITED | Private company limited by shares | Dissolved |
| HINO SEIKI (HK) CO., LIMITED | Private company limited by shares | Live |
| SEIKI INDUSTRY (H.K.) LIMITED | Private company limited by shares | Live |
| KUNIMOTO SEIKI (H.K.) COMPANY LIMITED | Private company limited by shares | Live |
| NISSHO SEIKI (HK) LIMITED | Private company limited by shares | Live |
| OSAKA SEIKI (H.K.) LIMITED | Private company limited by shares | Live |
| MITSUI SEIKI HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| SEIKI HOME LIMITED | Private company limited by shares | Live |
| HONG KONG NOMURA SEIKI CO., LIMITED | Private company limited by shares | Live |
| KOIZUMI SEIKI (HONG KONG) LIMITED | Private company limited by shares | Live |
| SEIKI SJK (HONG KONG) LIMITED | Private company limited by shares | Live |
| HONG KONG SEIKI LIMITED | Private company limited by shares | Live |
| SEIKI (HONG KONG) LIMITED | | Live |
| KASUGA SEIKI MANUFACTURING (HONG KONG) COMPANY LIMITED | Private company limited by shares | Live |
| HONG KONG MENEE SEIKI LIMITED | Private company limited by shares | Live |
| MORI SEIKI HONG KONG LIMITED | Private company limited by shares | Live |
| HONG KONG NIPPON SEIKI COMPANY LIMITED | Private company limited by shares | Live |
| Shima Seiki (Hong Kong) Limited | Private company limited by shares | Live |
| KUROTA SEIKI (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| HONGKONG DA TONG SEIKI CO., LIMITED | Private company limited by shares | Live |