| Company | Timeline | Status | |
| Dukespub Ltd Director • Director | 3 Nov 2025←1 Month→Current | Active | |
| Johnston Excavators Ltd Director • Director | 19 Oct 2018←7 Years→Current | Active | |
| Johnston Tractors Limited Director • Unreported | 24 Nov 2011←14 Years→Current | Active | |
| Tractors Limited Director • Agricultural Engineer | 22 May 2003←22 Years→Current | Active | |
| Agrigroup Limited Director • Unreported | 6 Dec 1995←30 Years→Current | Active | |
| Frank Johnston (Tractors) Limited Director • Agricultural Engineer | 20 Sep 1991←34 Years→Current | Active | |
