| Company | Timeline | Status | |
| Professional Acoustics Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
| Proac Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
| Celef Audio International Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
