| Company | Timeline | Status | |
| Singer Interactive Limited Secretary • Teacher | 9 Nov 1998←18 Years→4 Apr 2017 | Active | |
| Barrier Biotech Limited Secretary • Unreported | 10 Nov 1996←28 Years→31 Oct 2025 | Active | |
| Quarles Limited Secretary • Teacher | 4 Nov 1996←29 Years→Current | Active | |
| Washingford Research Limited Secretary • Unreported | 24 Jul 1992←33 Years→Current | Active | |
