| 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 |
| STAR SEIKI (HONGKONG) COMPANY LIMITED | Private company limited by shares | Live |
| SAKURA SEIKI INDUSTRIAL CO., LIMITED | Private company limited by shares | Dissolved |
| HONG KONG SEIKI PRECISION INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| SEIKI INTERNATIONAL LIMITED | Private company limited by shares | Live |
| HI-TECH SEIKI INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| DAIWA SEIKI INTERNATIONAL INDUSTRY GROUP LIMITED | Private company limited by shares | Live |
| SEIKI JEWELLERY (INTERNATIONAL) LIMITED | Private company limited by shares | Live |
| NOMURA SEIKI (INTERNATIONAL) LIMITED | Private company limited by shares | Live |
| SEIKI INVESTMENT LIMITED | Private company limited by shares | Live |
| JAPAN IVAGAKI SEIKI CO., LIMITED | Private company limited by shares | Live |
| Kasuga Seiki Limited | Private company limited by shares | Live |
| MITSUI SEIKI KOGYO CO., LIMITED | Private company limited by shares | Live |
| HONG KONG KORIYAMA SEIKI LIMITED | Private company limited by shares | Live |
| SEIKI LIGHTING LIMITED | Private company limited by shares | Live |
| KEODO SEIKI MACHINE TOOL LIMITED | | Live |
| MAENISHI SEIKI LIMITED | | Live |
| MITSUYO SEIKI CO LIMITED | Private company limited by shares | Live |
| MITSUYO SEIKI (H.K.) CO., LIMITED | Private company limited by shares | Live |
| NAKAMURA SEIKI COMPANY LIMITED | Private company limited by shares | Live |
| OSAKA SEIKI COMPANY LIMITED | Private company limited by shares | Dissolved |
| SUNWAY SEIKI TRADING CO., LIMITED | Private company limited by shares | Live |
| SUNWAY SEIKI INTERNATIONAL TRADING LIMITED | Private company limited by shares | Live |
| Seiki System Furniture Limited | Private company limited by shares | Live |
| TAIAN SEIKI COMPANY LIMITED | Private company limited by shares | Live |
| Taichung Seiki Co., Limited | Private company limited by shares | Live |
| TAIWAN FUTE SEIKI SHARE LIMITED | Private company limited by shares | Live |
| TAIWAN FUTE SEIKI SHARE LIMITED | Private company limited by shares | Live |
| HI-TECH SEIKI TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| TOKAI SEIKI COMPANY (H.K.) LIMITED | Private company limited by shares | Live |
| Toustar Seiki Co., Limited | Private company limited by shares | Live |
| SEIKI TRANSPORTATION LIMITED | Private company limited by shares | Live |