| Company | Timeline | Status | |
| Letnet Limited Director • Director | 4 Jun 1997←28 Years→Current | Active | |
| Alan Roberts Dairy Engineers Limited Director • Dairy Engineer | 24 May 1991←31 Years→28 Mar 2023 | Dissolved | |
| Alan Roberts Dairy Engineers Limited Secretary • Unreported | 24 May 1991←31 Years→28 Mar 2023 | Dissolved | |
