| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Grid Investment Holdings Ltd | 03396498 | 12/09/1997 | 15/12/1998 | Dissolved |
| Grid One Ltd | 03426862 | 03/10/1997 | 15/12/1999 | Dissolved |
| LOGICA ESIS (UK) LIMITED | 02444282 | 28/02/1996 | 25/11/1999 | Dissolved |
| NATIONAL GRID (US) HOLDINGS LIMITED | 02630496 | 03/06/1999 | 19/10/2000 | Gold |
| NATIONAL GRID (US) INVESTMENTS | 03784527 | 09/06/1999 | 19/10/2000 | Dissolved |
| NATIONAL GRID (US) INVESTMENTS 2 LIMITED | 03784528 | 09/06/1999 | 19/10/2000 | Dissolved |
| NATIONAL GRID (US) INVESTMENTS 3 | 03867114 | 26/11/1999 | 19/10/2000 | Dissolved |
| NATIONAL GRID (US) INVESTMENTS 4 LIMITED | 03867128 | 26/11/1999 | 19/10/2000 | Bronze |
| NATIONAL GRID ELECTRICITY TRANSMISSION PLC | 02366977 | 01/10/1995 | 04/02/2000 | Silver |
| NATIONAL GRID FOUR LIMITED | 03928172 | 15/03/2000 | 19/10/2000 | Dissolved |
| NATIONAL GRID HOLDINGS LIMITED | 03096772 | 25/03/1999 | 19/10/2000 | Silver |
| NATIONAL GRID HOLDINGS ONE PLC | 02367004 | 17/11/1995 | 19/10/2000 | Silver |
| NATIONAL GRID INTERNATIONAL LIMITED | 02537092 | 23/09/1998 | 19/10/2000 | Gold |
| NATIONAL GRID THREE LIMITED | 03928169 | 17/03/2000 | 19/10/2000 | Dissolved |
| NGG TELECOMS HOLDINGS LIMITED | 03703629 | 16/04/1999 | 19/10/2000 | Dissolved |
| NGG TELECOMS LIMITED | 02536498 | 11/03/1998 | 19/10/2000 | Dissolved |
| SIEMENS METERING DATACARE LIMITED | 02815238 | 28/11/1996 | 25/11/1999 | Dissolved |
| Teldata International Ltd | 02536546 | 16/12/1998 | 19/10/2000 | Dissolved |