| Company | Timeline | Status | |
| Square Root Holdings Limited Director • Industrial Chemist | 5 Oct 2000←25 Years→Current | Active | |
| A C S Analysis Limited Director • Chartered Chemist | 7 Dec 1999←3 Years→14 Jan 2003 | Dissolved | |
| Square Root Limited Director • Industrial Chemist | 17 Jan 1996←29 Years→Current | Active | |
