| Company | Timeline | Status | |
| Mackay Developments Limited Director • Company Director | 20 Sep 1996←29 Years→Current | Active | |
| Precision Relays Limited Director • Company Director | 31 Dec 1989←25 Years→26 Jun 2015 | Active | |
| John Mackay (Plant) Limited Director • Dir | 31 Dec 1988←36 Years→Current | Active | |
