| Company | Timeline | Status | |
| Monitran Technology Limited Director • Engineer | 12 Nov 2007←14 Years→1 Feb 2022 | Dissolved | |
| Observatory Management Limited Director • Director | 21 Sep 2006←6 Years→2 Jul 2013 | Active | |
| Observatory Management Limited Director • Director | 18 Aug 2003←2 Years→23 Aug 2005 | Active | |
| Observatory Management Limited Director • Engineer | 26 Jan 2001←1 Month→5 Mar 2001 | Active | |
| Monitran Limited Director • Engineer | 1 Dec 2000←23 Years→27 Jan 2024 | Active | |
| Craft Engineering Limited Director • Engineer | 24 Sep 1992←2 Years 8 Months→31 May 1995 | Active | |
| Machine Monitoring Systems Limited Director • Company Director | 16 Nov 1991←2 Years 7 Months→3 Jul 1994 | Active | |
| Saxeway Limited Director • Company Director | 1 Mar 1991←32 Years→27 Jan 2024 | Active | |
