| Company | Timeline | Status | |
| Positron Computers Limited Director • Consultant Engineer | 13 Jan 1992←34 Years→Current | Active | |
| Positron Electronics Limited Director • Engineering Consultant | 13 Jan 1991←35 Years→Current | Active | |
| Positron Electronics Limited Director • Unreported | 1 Jan 1970←56 Years→Current | Active | |
| Positron Computers Limited Director • Unreported | 1 Jan 1970←56 Years→Current | Active | |
