| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ROSEMEAD ESTATES LIMITED | 04099065 | 21/11/2000 | Dissolved |
| SLG REALISATIONS PLC | 01890236 | 09/07/2001 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| COLUMBIA THREADNEEDLE HOLDINGS LIMITED | 02355196 | 03/08/1991 | 01/05/1996 | Bronze |
| COSTAIN GROUP PLC | 01393773 | 06/06/2001 | 31/12/2007 | Gold |
| ELECTRICITY ASSOCIATION SERVICES LIMITED | 02366837 | 05/03/1996 | 31/03/1997 | Dissolved |
| ELECTRICITY PENSIONS LIMITED | 02416242 | 31/08/1992 | 13/09/1996 | One Red Flag |
| ELECTRICITY PENSIONS SERVICES LIMITED | 03137477 | 01/04/1996 | 30/04/1997 | Bronze |
| ELECTRICITY PENSIONS TRUSTEE LIMITED | 02479327 | 12/03/1992 | 16/03/1999 | Silver |
| Esn Holdings Ltd | 02786543 | 23/04/1993 | 16/03/1999 | Dissolved |
| Esn Pmg (Services) Ltd | 02789918 | 23/04/1993 | 01/05/1996 | Dissolved |
| FIREFLY POWER HOLDINGS LIMITED | 05807469 | 19/05/2006 | 05/04/2007 | Dissolved |
| FIREFLY POWER LIMITED | 04844902 | 19/07/2004 | 05/04/2007 | Dissolved |
| NATIONAL GRID ELECTRICITY TRANSMISSION PLC | 02366977 | 15/08/1991 | 30/03/1996 | Silver |
| NATIONAL GRID HOLDINGS ONE PLC | 02367004 | 17/11/1995 | 22/07/1999 | Silver |
| Smartlogik Holdings Plc | 04089382 | 18/12/2000 | 06/07/2001 | Dissolved |
| Smartlogik Search Ltd | 03434777 | 18/12/2000 | 06/07/2001 | Dissolved |
| THE INSTITUTION OF ENGINEERING AND TECHNOLOGY BENEVOLENT FUND | 00441284 | 01/10/2000 | 16/10/2007 | Bronze |
| THE MICHAEL SIEFF FOUNDATION | 05098550 | 08/04/2004 | 19/03/2016 | Silver |