| 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 |