| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| NATIONAL GRID JERSEY INVESTMENTS LIMITED | FC025510 | 01/11/2017 | Dissolved |
| NATIONAL GRID US 6 LLC | FC028513 | 01/11/2017 | Amber |
| NG JERSEY LIMITED | FC035094 | 05/03/2018 | Dissolved |
| NGT HOLDING COMPANY (ISLE OF MAN) LIMITED | FC028956 | 01/11/2017 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| LATTICE GROUP LIMITED | 03900804 | 01/11/2017 | 14/04/2023 | Silver |
| NATGRID ONE LIMITED | 05521240 | 01/11/2017 | 21/06/2022 | Dissolved |
| NATGRIDTW1 LIMITED | 07579324 | 01/11/2017 | 12/02/2020 | Not Trading |
| NATIONAL GRID (US) INVESTMENTS 2 LIMITED | 03784528 | 01/11/2017 | 28/01/2021 | Dissolved |
| NATIONAL GRID (US) INVESTMENTS 4 LIMITED | 03867128 | 01/11/2017 | 14/04/2023 | Bronze |
| NATIONAL GRID (US) PARTNER 1 LIMITED | 04314432 | 01/11/2017 | 14/04/2023 | Amber |
| NATIONAL GRID TWELVE LIMITED | 04355616 | 01/11/2017 | 12/02/2020 | Not Trading |