| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BRISTOL WATER CORE HOLDINGS LIMITED | 04637554 | 04/04/2022 | Silver |
| BRISTOL WATER HOLDINGS LIMITED | 02630760 | 04/04/2022 | Bronze |
| BRISTOL WATER HOLDINGS UK LIMITED | 04789566 | 04/04/2022 | Bronze |
| BRISTOL WATER PLC | 02662226 | 09/03/2022 | Amber |
| CREWW EXECUTIVE BOARD LIMITED | 13737242 | 11/11/2021 | Not Trading |
| DUNFERMLINE SOLAR LIMITED | 12683727 | 07/06/2023 | One Red Flag |
| EEB16 LIMITED | 10789260 | 10/07/2023 | One Red Flag |
| INSTITUTE OF WATER | 00539193 | 27/11/2023 | Gold |
| PENINSULA MB LIMITED | 07871694 | 01/02/2015 | Dissolved |
| PENNON GROUP PLC | 02366640 | 01/02/2015 | Silver |
| PENNON POWER LIMITED | 00736732 | 15/03/2023 | Silver |
| PENNON WATER SERVICES LIMITED | 09902835 | 22/07/2020 | Silver |
| RESTORE PLC | 05169780 | 02/01/2019 | Amber |
| SOUTH WEST WATER LIMITED | 02366665 | 31/07/2020 | Bronze |
| WATER UK | 03539600 | 31/07/2020 | Bronze |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| PENINSULA LEASING LIMITED | 03926798 | 31/08/2007 | 18/02/2015 | Dissolved |
| PENINSULA PROPERTIES (EXETER) LIMITED | 02307220 | 11/09/2017 | 09/12/2020 | Silver |
| PENNON PENSION TRUSTEES LIMITED | 02388620 | 23/06/2011 | 24/07/2018 | Not Trading |
| SOURCE COLLECTIONS LIMITED | 03433146 | 01/07/2008 | 18/02/2015 | Dissolved |
| SOUTH WEST WATER CUSTOMER SERVICES LIMITED | 07620338 | 22/06/2011 | 18/02/2015 | Amber |
| SOUTH WEST WATER FINANCE PLC | 05722435 | 31/08/2007 | 18/02/2015 | Silver |
| SOUTH WEST WATER LIMITED | 02366665 | 31/08/2007 | 31/01/2015 | Bronze |
| VIRIDOR LIMITED | 02456473 | 01/02/2015 | 31/03/2016 | Silver |