| Company | Timeline | Status | |
| Tilewind Limited Director • Engineer | 15 Aug 2006←7 Years→31 Dec 2013 | Active | |
| Wedge Wire Screens Limited Director • Engineer | 16 Feb 2005←8 Years→31 Dec 2013 | Active | |
| Sampling Engineering Systems Limited Secretary • Unreported | 28 Aug 2003←10 Years→31 Dec 2013 | Active | |
| Optima House Limited Secretary • Unreported | 28 Aug 2003←10 Years→31 Dec 2013 | Active | |
| Optima International Limited Secretary • Engineer | 28 Aug 2003←1 Year 5 Months→15 Feb 2005 | Active | |
| Optimum Systems Limited Secretary • Engineer | 1 Jun 2003←10 Years→31 Dec 2013 | Active | |
| Optima International Limited Director • Engineer | 1 Apr 2003←10 Years→31 Dec 2013 | Active | |
| Optimum Systems Limited Director • Engineer | 29 Dec 1991←22 Years→31 Dec 2013 | Active | |
