| Company | Timeline | Status | |
| Rounding Energy Design Services Limited Director • Unreported | 13 Jan 2026←1 Month→Current | Active | |
| M J Rounding Design Ltd Director • Unreported | 5 Feb 2018←8 Years→Current | Active | |
Black Cat Projects Limited Director • Unreported | 4 May 2006←8 Years→16 Sep 2014 | Dissolved | |
