| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CAMBRIAN UTILITIES LIMITED | 10082803 | 19/11/2019 | One Red Flag |
| DWR CYMRU (FINANCING) LIMITED | FC023222 | 23/09/2013 | Dissolved |
| DWR CYMRU (FINANCING) UK PLC | 11949988 | 16/04/2019 | Silver |
| DWR CYMRU (HOLDINGS) LIMITED | 03954867 | 01/08/2006 | Silver |
| DWR CYMRU CYFYNGEDIG | 02366777 | 01/08/2006 | Amber |
| GLAS CYMRU (SECURITIES) CYFYNGEDIG | 04129132 | 23/09/2013 | Amber |
| GLAS CYMRU ANGHYFYNGEDIG | 03975719 | 01/08/2006 | Bronze |
| GLAS CYMRU HOLDINGS CYFYNGEDIG | 09917809 | 20/04/2016 | Bronze |
| WATER UK | 03539600 | 01/04/2020 | Bronze |
| WELSH WATER HOLDINGS LIMITED | 10079953 | 19/11/2019 | One Red Flag |
| WELSH WATER INFRASTRUCTURE LIMITED | 10082776 | 19/11/2019 | One Red Flag |
| WELSH WATER ORGANIC ENERGY (CARDIFF) LTD | 08356859 | 19/11/2019 | Amber |
| WELSH WATER ORGANIC ENERGY LTD | 08356949 | 19/11/2019 | Bronze |
| WELSH WATER ORGANIC WASTE LIMITED | 11468450 | 19/11/2019 | Silver |
| WELSH WATER UTILITIES FINANCE PLC | 02869784 | 01/08/2006 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| INSTITUTE OF WATER | 00539193 | 12/10/2022 | 09/09/2024 | Gold |