| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| NORTHUMBRIAN WATER GROUP LIMITED | 04760441 | 08/10/2012 | Amber |
| NORTHUMBRIAN WATER LIMITED | 02366703 | 08/10/2012 | Amber |
| UK WATER (2011) LIMITED | 07509453 | 08/10/2012 | Dissolved |
| WALES & WEST GAS NETWORKS (JUNIOR FINANCE) LIMITED | 05149491 | 10/10/2012 | Dissolved |
| WALES & WEST GAS NETWORKS (SENIOR FINANCE) LIMITED | 05149493 | 10/10/2012 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| EVERSHOLT RAIL LEASING LIMITED | 02720809 | 16/04/2015 | 06/02/2018 | Bronze |
| NORTHUMBRIAN SERVICES LIMITED | 03114615 | 08/03/2013 | 16/03/2016 | Silver |
| NORTHUMBRIAN WATER GROUP LIMITED | 04760441 | 08/10/2012 | 21/05/2024 | Amber |
| WALES & WEST GAS NETWORKS (HOLDINGS) LIMITED | 05095454 | 10/10/2012 | 18/04/2024 | Silver |
| WALES & WEST UTILITIES FINANCE PLC | 06766848 | 10/10/2012 | 18/04/2024 | Silver |
| WALES & WEST UTILITIES HOLDINGS LIMITED | 07092596 | 10/10/2012 | 18/04/2024 | Silver |
| WALES & WEST UTILITIES LIMITED | 05046791 | 10/10/2012 | 18/04/2024 | Silver |
| WEST GAS NETWORKS LIMITED | 08151511 | 10/10/2012 | 18/04/2024 | Silver |
| WESTERN GAS NETWORKS LIMITED | 08151473 | 10/10/2012 | 18/04/2024 | Silver |