| SEIRYU JAPAN PROPERTY INVESTMENT LIMITED | | Live |
| SEIRYU TRADING COMPANY LIMITED | Private company limited by shares | Live |
| WELL SEIS INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| MANA SEIS TECH CO., LIMITED | Private company limited by shares | Live |
| Seisa Trading (Hong Kong) Limited | Private company limited by shares | Live |
| URASHIMA SEISAKUJO COMPANY LIMITED | Private company limited by shares | Live |
| SEISEI HK LIMITED | Private company limited by shares | Live Commenced dormancy on 12-Aug-2016 |
| Seisen Limited | | Live |
| MISUZU SEISEN (HONG KONG) LIMITED | Private company limited by shares | Live |
| SEISENBACHER HONG KONG LIMITED | Private company limited by shares | Dissolved |
| Seisetbo Company Limited | Private company limited by shares | Live |
| SEISHIN LIMITED | Private company limited by shares | Dissolved |
| SEISI TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| Seisma Limited | Private company limited by shares | Live |
| SEISMIC LIMITED | Private company limited by shares | Dissolved |
| SEISMIC QC LIMITED | Private company limited by shares | Live |
| SEISMIC CHINA LIMITED | Private company limited by shares | Dissolved |
| SEISMIC DIGITAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| JEBCO SEISMIC FAR EAST LIMITED | Private company limited by shares | Dissolved |
| Seismic Resources Limited | Private company limited by shares | Live |
| ROUEN SEISMIC LIMITED | Private company limited by shares | Dissolved |
| SEISMIK TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| SEISMIQ CONSULTING (HK) LIMITED | Private company limited by shares | Live |
| SEISMOMATIC LIMITED | Private company limited by shares | Live |
| SEISONOTONIC LIMITED | Private company limited by shares | Dissolved |
| SEIT LIMITED | Private company limited by shares | Live |
| SEITAG LIMITED | Private company limited by shares | Live |
| SEITATSU TRADING LIMITED | Private company limited by shares | Dissolved |
| SEITBACH LIMITED | Private company limited by shares | Live |
| HONG KONG SEITE TRADING TRADING LIMITED | | Live |
| Seitech Electronics Limited | Private company limited by shares | Live |
| Seitek International Co. Limited | Private company limited by shares | Live |
| Seiter International Co., Limited | Private company limited by shares | Live |
| SeiTex Co. Limited | Private company limited by shares | Live |
| SEITLER BROKERS LIMITED | Private company limited by shares | Live |
| SEITO SYSTEMS LIMITED | Private company limited by shares | Live |
| Seitoku group Limited | Private company limited by shares | Live |
| SEITRON LIMITED | Private company limited by shares | Dissolved |
| SEITZ HK LIMITED | Private company limited by shares | Live |
| HK SEIUN SKY LIMITED | | Live |
| SEIWA COMPANY LIMITED | Private company limited by shares | Dissolved |
| SEIWA COMPANY LIMITED | Private company limited by shares | Live |
| SEIWA MACHINERY LIMITED | Private company limited by shares | Live |
| SEIWAJYUKU FEDERATION COMPANY LIMITED | Private company limited by shares | Live |
| SEIWAJYUKU HONG KONG LIMITED | Company limited by guarantee | Live |
| SEIWIN ELECTRONIC COMPANY LIMITED | Private company limited by shares | Dissolved |
| Hongkong Seiwu Trading Co., Limited | | Live |
| SEIYA TRADE LIMITED | Private company limited by shares | Live |
| Hong Kong Kyoritsu Seiyaku Corporation Limited | Private company limited by shares | Live |
| SEIYO HK CO., LIMITED | Private company limited by shares | Live |
| SEIYO TRADING CO., LIMITED | Private company limited by shares | Live |
| HONGKONG SEIYO INTERNATIONAL COMPANY LIMITED | Private company limited by shares | Live |
| HONGKONG SEIYO TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| SEIYO INTERNATIONAL CO., LIMITED | Private company limited by shares | Live |
| SEIYO EXPRESS INTERNATIONAL LIMITED | Private company limited by shares | Live |
| SEIYO JAPAN TRADING DEVELOPMENT LIMITED | Private company limited by shares | Live |
| SEIYO GLOBAL LOGISTICS (ASIA) LIMITED | Private company limited by shares | Live |
| SEIYU ASIA LIMITED | Private company limited by shares | Dissolved |
| SEIYU ASIA LIMITED | Private company limited by shares | Dissolved |
| Seiyu Group Limited | Private company limited by shares | Live |
| SEIYU INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| Seiyu Trading Limited | Private company limited by shares | Dissolved |
| SEIYU ASIA TRAVEL LIMITED | Private company limited by shares | Dissolved |
| SEIZE COMPANY LIMITED | Private company limited by shares | Dissolved |
| SeizeField Limited | Private company limited by shares | Live |
| SEIZIAN ASIAN MANUFACTURERS LIMITED | Private company limited by shares | Dissolved |
| SEIZON INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |