| 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 |