| Company | Timeline | Status | |
| Tester Racing And Engineering Ltd Director • Managing Director | 19 Oct 2018←7 Years→Current | Active | |
| Tester Auto Paint And Upholstery Ltd Director • Managing Director | 19 Oct 2018←7 Years→Current | Active | |
| Tester Racing Ltd Director • Engineer | 17 Jul 2014←9 Years→19 Sep 2023 | Dissolved | |
| Tester Racing Engines Limited Director • Engineer | 21 Jul 2008←17 Years→Current | Active | |
| Tester Engineering Limited Director • Engineer | 19 May 2005←17 Years→7 Sep 2022 | Dissolved | |
