| AEE Renewables UK 26 Limited | London | 2011 |
| AEE Renewables UK 29 Limited | Birmingham | 2011 |
| AEE Renewables UK 3 Limited | London | 2010 |
| AEE Renewables UK 31 Limited | London | 2011 |
| Aegis Fire Security and Electrical Ltd | Edinburgh | 2020 |
| AEH Elec Limited | Hartlepool | 2017 |
| AEI Holdco Limited | Norwich | 2013 |
| AEI Lending Limited | Norwich | 2013 |
| AEI Solar Limited | Norwich | 2013 |
| Aeircon Limited | Slough | 2025 |
| AEM Electrical Services Ltd | March | 2014 |
| AEM Electrics Ltd | Belfast | 2014 |
| Aeolus Wind Limited | London | 2013 |
| Aeon Blue Solar Ltd | Newcastle Upon Tyne | 2025 |
| AER Electrical Services Ltd. | Wisbech | 2018 |
| AER Fhorsa Limited | Omagh | 2016 |
| Aeras Limited | Kirk Hammerton | 2021 |
| Aerem Energy Ltd | London | 2024 |
| Aerem Group Limited | Bournemouth | 2022 |
| Aerfen Energy Ltd | London | 2022 |
| Aericon Ltd | Watford | 2018 |
| Aeris Power Limited | London | 2012 |
| Aerospace Energy UK Limited | London | 2018 |
| Aess (NI) Limited | Belfast | 2023 |
| Aetherforge Compute Ltd | Ivybridge | 2026 |
| Aeuk Battery Project IX Ltd | Bristol | 2022 |
| Aeuk Battery Project V Ltd | Bristol | 2022 |
| Aeuk Battery Project VI Ltd | Bristol | 2022 |
| Aeuk Battery Project VII Ltd | Bristol | 2022 |
| Aeuk Battery Project Viii Ltd | Bristol | 2022 |
| Aeuk Battery Project X Ltd | Bristol | 2023 |
| Aeuk Battery Project XI Ltd | Bristol | 2023 |
| Aeuk Battery Project Xiii Ltd | Bristol | 2023 |
| Aeuk Battery Project XIV Ltd | Bristol | 2023 |
| Aeuk Battery Project XIX Ltd | Bristol | 2023 |
| Aeuk Battery Project XV Ltd | Bristol | 2023 |
| Aeuk Battery Project XVI Ltd | Bristol | 2023 |
| Aeuk Battery Project Xvii Ltd | Bristol | 2023 |
| Aeuk Battery Project Xviii Ltd | Bristol | 2023 |
| Aeuk Battery Project XX Ltd | Bristol | 2023 |
| Aeuk Battery Project XXI Ltd | Bristol | 2023 |
| Aeuk Battery Project Xxiv Ltd | Bristol | 2023 |
| Aeuk Battery Project Xxvii Ltd | Bristol | 2023 |
| Aeuk Battery Project Xxxii Ltd | Bristol | 2024 |
| Aeuk Battery Project Xxxv Ltd | Bristol | 2024 |
| Aeuk Battery Project Xxxvi Ltd | Bristol | 2024 |
| Aeuk Solar Project II Ltd | Bristol | 2023 |
| Aeuk Solar Project III Ltd | Bristol | 2023 |
| Aeuk Solar Project IV Ltd | Bristol | 2023 |
| Aeuk Solar Project IX Ltd | Bristol | 2023 |
| Aeuk Solar Project V Ltd | Bristol | 2023 |
| Aeuk Solar Project VI Ltd | Bristol | 2023 |
| Aeuk Solar Project VII Ltd | Bristol | 2023 |
| Aeuk Solar Project Viii Ltd | Bristol | 2023 |
| Aeuk Solar Project X Ltd | Bristol | 2023 |
| Aeuk Solar Project XI Ltd | Bristol | 2023 |
| Aeuk Solar Project XII Ltd | Bristol | 2023 |
| Aeuk Solar Project XIV Ltd | Bristol | 2023 |
| Aeuk Wind Project I Ltd | Bristol | 2023 |
| Aeuk Wind Project II Ltd | Bristol | 2023 |
| Aeuk Wind Project III Ltd | Bristol | 2024 |
| Aeuk Wind Project IV Ltd | Bristol | 2024 |
| Aeuk Wind Project V Ltd | Bristol | 2024 |
| Aeuk Wind Project VI Ltd | Bristol | 2024 |
| Aeuk Wind Project VII Ltd | Bristol | 2024 |
| Aeuk Wind Project Viii Ltd | Bristol | 2024 |
| AEW Wind Limited | York | 2025 |
| AF Power Ltd | Burton-On-Trent | 2023 |
| AFF Windservices UK Ltd | Newbury | 2025 |
| Affan Lighting Industry Ltd | London | 2026 |
| Affix Electrical Services Ltd | Addlestone | 2014 |
| Afon Energy Limited | Cwmbran | 2011 |
| Afon Wysg Energy Limited | Nash | 2004 |
| Africa Clean Energy Buyers Ltd | London | 2025 |
| Africa Go Solar Ltd | Milton Keynes | 2018 |
| Africa Great Future Development Ltd | Aberdeen | 2022 |
| Africa Greenco Founders Ltd | Thames Ditton | 2018 |
| Africa Greenco Group Limited | Thames Ditton | 2021 |
| Africa Power Ltd | Cowfold | 2012 |
| African Sun Holdings Ltd | London | 2023 |
| Afrisaf Ltd | London | 2025 |
| Afriwinsun Ltd | Leeds | 2025 |
| AG Compressed Air Limited | Stanley | 2014 |
| Agenda Electrical Limited | Manchester | 2010 |
| Ages Cameroon Ltd | Crystal Palace | 2016 |
| AGH Energy Limited | Strabane | 2013 |
| Aghagower Limited | Wimborne | 2021 |
| Aghindaiagh Wind Limited | Enniskillen | 2012 |
| Aglow Climate Systems Ltd | Scunthorpe | 2025 |
| AGM Building Services Limited | Greenock | 2016 |
| AGR BF Holdco Limited | London | 2024 |
| AGR Burwell Acquisitionco Limited | London | 2026 |
| AGR Electrical Limited | Wrexham | 2018 |
| AGR Imports Limited | Belfast | 2022 |
| AGR Maintenance Limited | London | 2014 |
| AGR Networks Limited | Sutton | 2024 |
| AGR Renewables Limited | London | 2011 |
| AGR Solar 2 Limited | London | 2019 |
| AGR Solar 3 Limited | London | 2019 |
| AGR Solar 4 Limited | London | 2019 |