| Company | Timeline | Status | |
| London Money Market Limited Secretary • Company Director | 24 Nov 1999←25 Years→Current | Active | |
| London Money Market Limited Director • Company Director | 24 Nov 1999←25 Years→Current | Active | |
| London Stock Market Limited Director • Companies Director | 15 Sep 1999←26 Years→Current | Active | |
| London Stock Market Limited Secretary • Company Director | 15 Sep 1999←26 Years→Current | Active | |
| Calculus Research Limited Director • Companies Director Secretary | 1 Jan 1998←27 Years→Current | Active | |
| Calculus Software Limited Director • Unreported | 1 Jan 1998←27 Years→Current | Active | |
| Calculus Software Limited Secretary • Unreported | 5 May 1994←31 Years→Current | Active | |
| Calculus Research Limited Secretary • Unreported | 5 May 1994←31 Years→Current | Active | |
