| Company | Timeline | Status | |
| SMS22 Ltd Secretary • Unreported | 7 Feb 2006←16 Years→25 Oct 2022 | Dissolved | |
| Stone Manganese Marine Limited Secretary • Unreported | 28 Oct 2005←20 Years→Current | Active | |
| Stone Marine Services Limited Secretary • Unreported | 1 Sep 2005←20 Years→Current | Active | |
| Langham Farms Limited Secretary • Unreported | 30 Jul 2004←21 Years→Current | Active | |
| Portland Towage Limited Secretary • Unreported | 30 Jul 2004←17 Years→15 Feb 2022 | Dissolved | |
| Portland Harbour Development Limited Secretary • Unreported | 30 Jul 2004←17 Years→1 Mar 2022 | Dissolved | |
| Portland Pilotage Limited Secretary • Unreported | 30 Jul 2004←17 Years→22 Feb 2022 | Dissolved | |
| Portland Stevedoring Limited Secretary • Unreported | 30 Jul 2004←17 Years→1 Mar 2022 | Dissolved | |
| Portland Harbour Services Limited Secretary • Unreported | 30 Jul 2004←17 Years→22 Feb 2022 | Dissolved | |
| Portland Port Limited Secretary • Unreported | 30 Jul 2004←21 Years→Current | Active | |
