| Company | Timeline | Status | |
| Antifragile Systems Limited Director • Director | 16 Jan 2019←6 Years→Current | Active | |
| Larkfield House Limited Director • Consultant Systems Engineer | 4 Sep 2018←4 Years→30 Nov 2022 | Active | |
| Chester Brown Limited Director • Defence Consultant | 29 Mar 2007←16 Years→22 Feb 2024 | Dissolved | |
| Chester Brown Limited Director • Systems Engineer | 29 Mar 2007←4 Years→26 Jul 2011 | Dissolved | |
