| TECHTONE (HK) ENERGY TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| ORIENT TECHTONE INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| TECHTONE INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| Tech-Tone International Supply Chain Management Co. Limited | Private company limited by shares | Live |
| TECHTONIC ART LIMITED | Private company limited by shares | Live |
| TECHTONIC LIMITED | Private company limited by shares | Live |
| TECH-TOOLING CO., LIMITED | Private company limited by shares | Live |
| TECH-TOP LIMITED | Private company limited by shares | Live |
| Techtopper Limited | | Live |
| TECHTOUGH LIMITED | Private company limited by shares | Live |
| ISS TechTown Limited | Private company limited by shares | Live |
| Techtown Innovation Limited | | Live |