| Company | Timeline | Status | |
| Camcon Auto Limited Director • Technical Director | 28 Nov 2013←5 Years→31 Oct 2019 | Active | |
| R D Stone Engineering Limited Director • Consultant | 4 Sep 2008←13 Years→29 Jan 2022 | Dissolved | |
Ricardo Special Vehicles Limited Director • Engineer | 29 Jan 1993←1 Year 10 Months→1 Dec 1994 | Dissolved | |
| Ricardo Investments Limited Director • Engineer | 11 Jan 1993←5 Years→31 Aug 1998 | Active | |
