| HKST LIMITED | Private company limited by shares | Live |
| HKST Capital Limited | Private company limited by shares | Dissolved |
| HK-STAR ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| HKSTC WARRINGTON FIRE RESEARCH LIMITED | Private company limited by shares | Dissolved |
| HKSTC MET (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| HKSTEAMaker Limited | Private company limited by shares | Live |
| HKSTEMA LIMITED | Private company limited by shares | Live |
| Shenzhen HKSTOCKS Asset Management Co., Limited | Private company limited by shares | Live |
| HKSTOX Finance Limited | Private company limited by shares | Live |
| HKSTP IEC Limited | | Live |
| HKSTREET.COM LIMITED | Private company limited by shares | Dissolved |
| HK-STRONGMACHINE LIMITED | Private company limited by shares | Dissolved |