| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| A R B (Realisations) Ltd | 00478397 | 12/03/1991 | Dissolved |
| Adco Industrial Components Ltd | 01235942 | 07/02/1992 | Dissolved |
| Aligon Ltd | 00078977 | 02/08/1991 | Dissolved |
| Burkham Developments Ltd | 02192977 | 07/03/1995 | Dissolved |
| Clayhithe (Overseas Investments) Ltd | 01020009 | 07/03/1995 | Dissolved |
| E. W. REALISATIONS PLC | 00102627 | 28/06/1991 | Dissolved |
| Gonali Ltd | 00677355 | 02/08/1991 | Dissolved |
| Horningsea Investments Ltd | 01507222 | 07/03/1995 | Dissolved |
| Magnapower Group Ltd | 01868757 | 31/12/1991 | Dissolved |
| Midlands Energy Ltd | 04862142 | 16/01/2004 | Dissolved |
| Moatside Developments Ltd | 02340520 | 07/03/1995 | Dissolved |
| Motte Properties Ltd | 02340284 | 07/03/1995 | Dissolved |
| Offali Ltd | 00110059 | 02/08/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AQUILA STERLING LIMITED | 04391954 | 16/01/2004 | 04/07/2007 | Dissolved |
| AVON ENERGY PARTNERS HOLDINGS | 03196714 | 16/01/2004 | 04/07/2007 | Dissolved |
| Adwel Industries Ltd | 01515374 | 29/01/1992 | 11/12/1997 | Dissolved |
| BEST CHECKWEIGHERS LIMITED | 00801103 | 21/09/1992 | 28/01/1994 | Dissolved |
| BIG BANG EDUCATION CIC | 07264555 | 11/03/2011 | 30/09/2016 | One Red Flag |
| BLACK & LUFF PROPERTIES LIMITED | 00529716 | 21/09/1992 | 20/04/1994 | Not Trading |
| CITIGEN (LONDON) LIMITED | 02427823 | 21/10/2002 | 07/04/2003 | Bronze |
| CLAYHITHE AUTOMATION LIMITED | 00698425 | 21/09/1992 | 10/12/1997 | Dissolved |
| CLAYHITHE GROUP LIMITED | 00036451 | 22/12/1993 | 11/12/1997 | Dissolved |
| CLAYHITHE HOLDINGS LIMITED | 01788928 | 28/03/1995 | 11/12/1997 | Dissolved |
| CLAYHITHE INVESTMENTS LIMITED | 01469259 | 08/12/1995 | 11/12/1997 | Dissolved |
| CLAYHITHE LIMITED | 02610451 | 05/05/1993 | 10/12/1997 | Dissolved |
| CLAYHITHE MANAGEMENT LIMITED | 03039893 | 28/03/1995 | 11/12/1997 | Dissolved |
| COSTAIN GROUP PLC | 01393773 | 05/05/2016 | 01/12/2022 | Gold |
| E.ON ENERGY GAS (EASTERN) LIMITED | 04060387 | 21/10/2002 | 05/12/2005 | Not Trading |
| E.ON ENERGY GAS (NORTHWEST) LIMITED | 02850031 | 21/10/2002 | 05/12/2005 | Not Trading |
| E.ON ENERGY SOLUTIONS LIMITED | 03407430 | 01/10/2001 | 16/12/2011 | Gold |
| E.ON UK CHP LIMITED | 02684288 | 15/06/2001 | 01/07/2002 | Silver |
| E.ON UK IRONBRIDGE LIMITED | 03432417 | 21/10/2002 | 05/12/2005 | Dissolved |
| E.ON UK PLC | 02366970 | 19/02/2002 | 16/12/2011 | Gold |
| E.On Uk Drakelow Ltd | 03571889 | 21/10/2002 | 05/12/2005 | Dissolved |
| E.On Uk High Marnham Ltd | 03571892 | 21/10/2002 | 05/12/2005 | Dissolved |
| EAST MIDLANDS ELECTRICITY DISTRIBUTION HOLDINGS | 04254217 | 17/07/2001 | 04/07/2007 | Dissolved |
| EME DISTRIBUTION NO. 2 LIMITED | 04919996 | 03/10/2003 | 04/07/2007 | Dissolved |
| Electricity Association Ltd | 02367010 | 01/09/2001 | 11/05/2004 | Dissolved |
| MIDLANDS EXCELLENCE | 03213914 | 23/05/2002 | 04/09/2003 | Dissolved |
| MIDLANDS GAS LIMITED | 03364919 | 21/10/2002 | 04/07/2007 | Dissolved |
| NATIONAL GRID ELECTRICITY DISTRIBUTION (EAST MIDLANDS) PLC | 02366923 | 26/09/2001 | 01/04/2011 | Silver |
| NATIONAL GRID ELECTRICITY DISTRIBUTION (WEST MIDLANDS) PLC | 03600574 | 16/01/2004 | 01/04/2011 | Silver |
| NATIONAL GRID ELECTRICITY DISTRIBUTION MIDLANDS LIMITED | 02366928 | 16/01/2004 | 04/07/2007 | Silver |
| NATIONAL GRID PLC | 04031152 | 01/02/2012 | 26/07/2021 | Silver |
| NATS (EN ROUTE) PUBLIC LIMITED COMPANY | 04129273 | 01/04/2016 | 31/08/2024 | Silver |
| NATS HOLDINGS LIMITED | 04138218 | 01/09/2014 | 31/08/2024 | Silver |
| NORTHMERE LIMITED | 03232826 | 18/07/2002 | 17/05/2004 | Amber |
| POWERGEN LIMITED | 03586615 | 21/01/2002 | 02/10/2008 | Not Trading |
| POWERGEN WARM FRONT LIMITED | 04725781 | 01/01/2004 | 24/04/2007 | Dissolved |
| QUADRANT PIPELINES LIMITED | 02528816 | 21/12/1998 | 24/10/2001 | Gold |
| RALUBE LIMITED | 00944529 | 21/09/1992 | 14/01/2019 | One Red Flag |
| ROBIN A TECHNOLOGY REALISATIONS PLC | 03095862 | 01/08/2003 | 31/01/2011 | Dissolved |
| ROXSPUR PENSION SCHEMES LIMITED | 00379380 | 21/09/1992 | 11/12/1997 | Dissolved |
| SCOREBREEZE LIMITED | 04344402 | 13/05/2002 | 05/12/2005 | Dissolved |
| THE ENGINEERING AND TECHNOLOGY BOARD | 04322409 | 01/09/2010 | 30/09/2016 | Amber |
| TXU EUROPE (AH ONLINE) LIMITED | 03364798 | 21/10/2002 | 05/12/2005 | Dissolved |
| TXU EUROPE (AHG) LIMITED | 02630844 | 21/10/2002 | 05/12/2005 | Dissolved |
| TXU EUROPE (AHST) LIMITED | 03568459 | 21/10/2002 | 05/12/2005 | Dissolved |
| TXU WARM FRONT LIMITED | 03951849 | 21/10/2002 | 30/04/2007 | Dissolved |
| Txu Europe (Ahgd) Ltd | 03076057 | 21/10/2002 | 05/12/2005 | Dissolved |
| UKGBC LIMITED | 01029239 | 29/09/2010 | 10/12/2012 | Bronze |
| WESTERN GAS LIMITED | 02677708 | 21/10/2002 | 05/12/2005 | Dissolved |
| WPD MIDLANDS PROPERTIES LIMITED | 03600545 | 16/01/2004 | 21/02/2006 | Dissolved |
| Waltham Products (Ruislip) Ltd | 01601476 | 18/12/1992 | 11/12/1997 | Dissolved |
| Waltham Products Ltd | 01628672 | 07/02/1992 | 31/12/1992 | Dissolved |
| Welda Industrial Systems Ltd | 01209152 | 07/02/1992 | 31/12/1992 | Dissolved |