| Company | Timeline | Status | |
| H.S. (Air Filtration) Limited Secretary • Unreported | 16 Mar 2000←25 Years→Current | Active | |
| H.S. (Water Hygiene) Limited Secretary • Unreported | 16 Mar 2000←25 Years→Current | Active | |
| H. S. (Environmental) Ltd Secretary • Unreported | 26 Oct 1998←27 Years→Current | Active | |
| HSL Group Limited Secretary • Unreported | 16 Mar 1998←27 Years→Current | Active | |
