| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CADENT GAS LIMITED | 10080864 | 01/01/2018 | 01/01/2021 | Bronze |
| EVANS HOMES (SKELTON) NO.2 LIMITED | 04125370 | 18/07/2007 | 24/09/2013 | Bronze |
| GLANDWR CYFYNGEDIG | 04154570 | 07/03/2001 | 11/07/2005 | Not Trading |
| HARWORTH GROUP PLC | 02649340 | 01/06/2007 | 31/03/2011 | Gold |
| KELDA BUFFER LIMITED | 06433787 | 19/09/2008 | 31/03/2015 | Dissolved |
| KELDA EUROBOND CO LIMITED | 06433768 | 19/09/2008 | 31/03/2015 | Silver |
| KELDA GROUP LIMITED | 02366627 | 01/09/2000 | 31/03/2015 | Gold |
| KELDA HOLDCO LIMITED | 06433799 | 19/09/2008 | 31/03/2015 | Dissolved |
| KELDA JUNIOR HOLDCO LIMITED | 06433796 | 19/09/2008 | 31/03/2015 | Dissolved |
| KELDA NON-REG HOLDCO LIMITED | 06433788 | 19/09/2008 | 31/03/2015 | Dissolved |
| KELDA PIK CO LIMITED | 06436070 | 19/09/2008 | 31/03/2015 | Dissolved |
| KELDA WATER SERVICES LIMITED | 02180706 | 20/04/1998 | 06/08/2010 | Gold |
| KEYLAND DEVELOPMENTS LIMITED | 02180728 | 22/10/2002 | 27/06/2013 | Silver |
| SALTAIRE WATER LIMITED | 06433802 | 19/09/2008 | 31/03/2015 | Bronze |
| SEVERFIELD PLC | 01721262 | 19/07/2014 | 30/07/2024 | Gold |
| WALES & WEST GAS NETWORKS (HOLDINGS) LIMITED | 05095454 | 01/01/2012 | 09/11/2012 | Silver |
| WALES & WEST GAS NETWORKS (JUNIOR FINANCE) LIMITED | 05149491 | 01/01/2012 | 09/11/2012 | Dissolved |
| WALES & WEST GAS NETWORKS (SENIOR FINANCE) LIMITED | 05149493 | 01/01/2012 | 09/11/2012 | Dissolved |
| WALES & WEST UTILITIES FINANCE PLC | 06766848 | 01/01/2012 | 09/11/2012 | Silver |
| WALES & WEST UTILITIES HOLDINGS LIMITED | 07092596 | 01/01/2012 | 09/11/2012 | Silver |
| WALES & WEST UTILITIES LIMITED | 05046791 | 01/01/2012 | 09/11/2012 | Silver |
| WATERAID | 01787329 | 18/09/2003 | 08/10/2009 | Silver |
| YORKSHIRE WATER SERVICES FINANCE LIMITED | 04636719 | 31/01/2003 | 31/03/2015 | Bronze |
| YORKSHIRE WATER SERVICES HOLDINGS LIMITED | 06815156 | 10/02/2009 | 31/03/2015 | Gold |
| YORKSHIRE WATER SERVICES LIMITED | 02366682 | 03/11/1997 | 31/03/2015 | Silver |