| Company | Timeline | Status | |
| Ferncroft Management Limited Director • Engineer | 29 Sep 1998←3 Years→8 Jan 2002 | Active | |
| Rosegrade Limited Director • Engineer | 17 Apr 1992←33 Years→Current | Active | |
| Erw Court Property Management Company Limited Director • Engineer | 17 Apr 1992←1 Year 9 Months→20 Jan 1994 | Active | |
