| Company | Timeline | Status | |
| Ymddiriedolaeth Nant Gwrtheyrn Director • Pensaer | 20 May 2000←10 Years→18 Sep 2010 | Active | |
| Dobson Owen Cyf Secretary • Architect | 23 Mar 1999←21 Years→2 Mar 2021 | Active | |
| Dobson Owen Cyf Director • Architect | 23 Mar 1999←21 Years→2 Mar 2021 | Active | |
Cymad Director • Pensaer | 11 Sep 1995←5 Years→1 Apr 2001 | Dissolved | |
