| Company | Timeline | Status | |
| Tong Engineering Limited Director • Chairman | 28 Apr 2015←10 Years→Current | Active | |
| Peal Engineering Limited Director • Director | 29 Oct 2004←21 Years→Current | Active | |
| E.J.Tong & Sons(Engineering)Limited Director • Engineer | 1 Jun 1991←34 Years→Current | Active | |
| Tong Engineering Limited Director • Engineer | 1 Jun 1991←23 Years→28 Apr 2015 | Active | |
