| Company | Timeline | Status | |
| Wedge Wire Screens Limited Director • Director | 17 Oct 2016←12 Months→12 Oct 2017 | Active | |
| Cat-Maxx Ltd Director • Engineer | 21 Mar 2014←3 Years→12 Oct 2017 | Active | |
HSR I15 Limited Director • Engineer | 14 Jun 2012←4 Years→17 Jan 2017 | Dissolved | |
| Sampling Engineering Systems Limited Director • Engineer | 14 Dec 2000←16 Years→12 Oct 2017 | Active | |
| Don Valley Engineering Construction Limited Director • Managing Director | 1 Nov 1999←1 Year→6 Nov 2000 | Active | |
| Optima International Limited Director • Engineer | 7 Mar 1992←25 Years→12 Oct 2017 | Active | |
| Optima House Limited Director • Engineer | 31 Dec 1991←25 Years→12 Oct 2017 | Active | |
| Wedge Wire Screens Limited Director • Engineer | 31 Dec 1991←13 Years→16 Feb 2005 | Active | |
| Tilewind Limited Director • Engineer | 31 Dec 1991←25 Years→12 Oct 2017 | Active | |
| Optimum Systems Limited Director • Engineer | 29 Dec 1991←25 Years→12 Oct 2017 | Active | |
