| Company | Timeline | Status | |
| National Grid Offshore Limited Director • Company Secretary | 26 Jan 2020←2 Years 9 Months→18 Nov 2022 | Active | |
| NGC Employee Shares Trustee Limited Director • Company Secretary | 13 Nov 2019←3 Years→18 Nov 2022 | Active | |
| National Grid Belgium Limited Director • Company Secretary | 30 Nov 2018←2 Years 9 Months→11 Sep 2021 | Dissolved | |
| National Grid Blue Power Limited Director • Company Secretary | 30 Nov 2018←2 Years 9 Months→7 Sep 2021 | Dissolved | |
| National Grid Four Limited Director • Company Secretary | 30 Nov 2018←2 Years 9 Months→7 Sep 2021 | Dissolved | |
| National Energy System Operator Limited Director • Company Secretary | 30 Nov 2018←4 Months→1 Apr 2019 | Active | |
| National Grid Ventures Limited Director • Company Secretary | 30 Nov 2018←3 Years→18 Nov 2022 | Active | |
| Icelink Interconnector Limited Director • Company Secretary | 30 Nov 2018←3 Years→18 Nov 2022 | Active | |
| Supergrid Electricity Limited Director • Company Secretary | 30 Nov 2018←3 Years→18 Nov 2022 | Dissolved | |
| National Grid Ten Director • Company Secretary | 30 Nov 2018←3 Years→21 Jun 2022 | Dissolved | |
