| Company | Timeline | Status | |
| The Hill Group (1985) Limited Secretary • Unreported | 28 May 2008←17 Years→Current | Active | |
| Pinch Group Limited Secretary • Unreported | 22 Feb 2005←20 Years→Current | Active | |
| R. W. Hill (Felixstowe) Limited Secretary • Unreported | 22 Feb 2005←20 Years→Current | Active | |
| Hill Piling Limited Secretary • Unreported | 22 Feb 2005←20 Years→Current | Active | |
| R.W. Hill (Piling) Limited Secretary • Unreported | 22 Feb 2005←20 Years→Current | Active | |
Pumpwise Dredging Limited Secretary • Unreported | 22 Feb 2005←13 Years→27 Mar 2018 | Dissolved | |
