| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ASHORNE HILL MANAGEMENT COLLEGE | 00889791 | 23/11/1991 | 31/08/1994 | Gold |
| Beaufort Energy Ltd | SC147338 | 20/12/1994 | 24/03/1998 | Dissolved |
| CELTPOWER LIMITED | 02656561 | 03/03/1997 | 24/03/1998 | Gold |
| ELECTRICITY ASSOCIATION SERVICES LIMITED | 02366837 | 16/10/2003 | 03/01/2005 | Dissolved |
| Electricity Association Ltd | 02367010 | 01/04/2002 | 03/01/2005 | Dissolved |
| MVV ENVIRONMENT BALDOVIE LIMITED | SC148254 | 10/10/1994 | 03/10/1995 | Silver |
| NORTHERN IRELAND ELECTRICITY NETWORKS LIMITED | NI026041 | 04/03/2011 | 03/03/2018 | Silver |
| SCOTTISH POWER UK HOLDINGS LIMITED | SC232909 | 18/06/2002 | 30/03/2005 | Dissolved |
| SCOTTISH POWER UK PLC | SC117120 | 09/04/2002 | 30/03/2005 | Bronze |
| SCOTTISH WATER BUSINESS STREAM HOLDINGS LIMITED | SC332622 | 18/10/2007 | 31/05/2015 | Gold |
| SCOTTISH WATER BUSINESS STREAM LIMITED | SC294924 | 02/08/2006 | 01/06/2015 | Gold |
| SCOTTISH WATER HORIZONS HOLDINGS LIMITED | SC334620 | 30/11/2011 | 31/05/2015 | Gold |
| SOUTHERN WATER LIMITED | 02366620 | 01/03/1998 | 23/04/2002 | Silver |
| SOUTHERN WATER SERVICES LIMITED | 02366670 | 01/03/1998 | 01/04/2001 | Silver |
| SP DISTRIBUTION PLC | SC189125 | 14/08/2001 | 10/01/2005 | Silver |
| SP GAS LIMITED | SC170918 | 24/06/2002 | 10/01/2005 | Dissolved |
| SP MANWEB PLC | 02366937 | 14/09/2001 | 10/01/2005 | Bronze |
| SP POWER SYSTEMS LIMITED | SC215841 | 14/08/2001 | 10/01/2005 | Amber |
| SP TRANSMISSION PLC | SC189126 | 14/08/2001 | 10/01/2005 | Silver |
| TEXTURING TECHNOLOGY LIMITED | 02684488 | 05/02/1993 | 01/07/1994 | Silver |
| The Water Services Association of England & Wales | 01710723 | 12/10/1998 | 27/03/2001 | Dissolved |
| UTILITIES AND SERVICE INDUSTRIES TRAINING LIMITED | 01741451 | 09/06/1999 | 30/06/2001 | Dissolved |
| WATER UK | 03539600 | 17/06/1998 | 16/05/2001 | Silver |