| Company | Timeline | Status | |
| Harmon Manufacturing Limited Director • Unreported | 29 Sep 2015←10 Years→Current | Active | |
| Harmon Fabrication Limited Director • Unreported | 1 Feb 2007←18 Years→Current | Active | |
| Harmon Metal Treatments Limited Director • Unreported | 5 Nov 2001←24 Years→Current | Active | |
| Harmon Precision Grinding Limited Director • Unreported | 26 Oct 1998←27 Years→Current | Active | |
| Harmon Group Limited Director • Unreported | 26 Oct 1998←27 Years→Current | Active | |
| Harmon (Form Tools) Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
