| Company | Timeline | Status | |
| Topper International Limited Director • Unreported | 1 Aug 2016←9 Years→Current | Active | |
| C-Scope International Holdings Limited Director • Unreported | 1 Aug 2016←9 Years→Current | Active | |
| Ultratone Scientific Instruments Limited Director • Unreported | 1 Aug 2016←9 Years→Current | Active | |
| C. Scope International Limited Director • Unreported | 1 Aug 2016←9 Years→Current | Active | |
