| Enray SPV 241491 Limited | Rugby | 2025 |
| Enray SPV 241492 Limited | Rugby | 2025 |
| Enray SPV 24230 Limited | Rugby | 2025 |
| Enray SPV 24613 Limited | Rugby | 2025 |
| Enray SPV 250222 Limited | Rugby | 2026 |
| Enray SPV 250224 Limited | Rugby | 2025 |
| Enray SPV 250351 Limited | Rugby | 2025 |
| Enray SPV 250617 Limited | Rugby | 2025 |
| Enray SPV 250807 Limited | Rugby | 2026 |
| Enray SPV 251095 Limited | Rugby | 2026 |
| Enray SPV 251128 Limited | Rugby | 2026 |
| Enrick Gridco Limited | Perth | 2016 |
| Ensco Energy Services Company (UK) Ltd | London | 2015 |
| Ensign Power Ltd. | Banff | 2011 |
| Enso Green Holdings a Limited | London | 2020 |
| Enso Green Holdings B Limited | London | 2020 |
| Enso Green Holdings C Limited | London | 2020 |
| Enso Green Holdings D Limited | London | 2020 |
| Enso Green Holdings F Limited | London | 2020 |
| Enso Green Holdings G Limited | London | 2020 |
| Enso Green Holdings H Limited | London | 2020 |
| Enso Green Holdings I Limited | London | 2020 |
| Enso Green Holdings J Limited | London | 2020 |
| Enso Green Holdings K Limited | London | 2020 |
| Enso Green Holdings L Limited | London | 2020 |
| Enso Green Holdings M Limited | London | 2020 |
| Enso Green Holdings O Limited | London | 2020 |
| Enso Green Holdings P Limited | London | 2021 |
| Enso Green Holdings Q Limited | London | 2021 |
| Enso Green Holdings R Limited | London | 2021 |
| Enso Green Holdings SS Limited | London | 2021 |
| Enso Green Holdings U Limited | London | 2021 |
| Enso Green Holdings V Limited | London | 2021 |
| Enso Green Holdings X Limited | London | 2021 |
| Enso Green Holdings Y Limited | London | 2021 |
| Enstroga Ltd | Nottingham | 2015 |
| Entech Commercial Group Limited | Harrogate | 2015 |
| Enthalpy Group Limited | Edgware | 2021 |
| Enthalpy Systems Ltd | Tetbury | 2022 |
| Entice Energy Supply Limited | Cardiff | 2015 |
| ENTRA1 Energy (UK) Limited | London | 2023 |
| ENTRA1 Nuscale (UK) Limited | London | 2024 |
| ENV Cool Ltd | Hemel Hempstead | 2022 |
| Envantage Renewables Ltd | Manchester | 2014 |
| Envatech Limited | Sale | 2006 |
| Envigor Energy Ltd | Trowbridge | 2026 |
| Enviro Fire Water & Air Limited | Newry | 2015 |
| Enviro-Air Ltd | Bradford | 2012 |
| Envirolec Development Services Limited | Preston | 2016 |
| Enviromental Solutions Limited | Stockport | 2018 |
| Environment Safety Ltd | London | 2025 |
| Environment Sustainable Operational Resources (Esor) Limited | London | 2024 |
| Environmental Engineering (UK) Limited | Manchester | 1991 |
| Environmental Management & Services Limited | Hereford | 2008 |
| Environmental Recovery Incorporated Limited | Sheffield | 1991 |
| Environmental Services (Hvac) Limited | Batley | 2011 |
| Environmental Temperature Control Limited | Wirral | 2008 |
| Environn Energy Company Ltd | Islington | 2012 |
| Enviroparks Operations Limited | Abergavenny | 2014 |
| Enviropower Ltd | Lancing | 2006 |
| Envirotech Energy Management Ltd | Canary Wharf | 2019 |
| Envirotemp Services Ltd | Kent | 2025 |
| Envisage Future Energy (UK & Ireland) Limited | Belfast | 2024 |
| Enyas Hill Wind Farm Ltd | Finstown | 2012 |
| Enzec Ltd | Kings Langley | 2017 |
| EO Green Utilities Ltd | Harrogate | 2021 |
| Eocycle UK Limited | Birmingham | 2019 |
| Eolian Blackwood Limited | London | 2025 |
| Eolian Three Limited | London | 2017 |
| Eomext Energy Limited | London | 2025 |
| EOS Climate and Energy Ltd | Windsor | 2020 |
| Eozee Limited | Oundle | 2021 |
| EP Commodities London Ltd | London | 2024 |
| EP Swindon Solar Limited | Swindon | 2017 |
| EPB Electrical Ltd | Manchester | 2014 |
| EPG Energy Limited | Chelmsford | 2008 |
| EPG Netley Solar North Limited | Canary Wharf | 2013 |
| EPG Specialists Ltd | London | 2010 |
| EPG Utilities Ltd | Gt Yarmouth | 2016 |
| EPG04 Limited | Henlow | 2020 |
| EPI (Theale) Ltd | London | 2025 |
| Epic Power Ltd | Accrington | 2022 |
| Epiros Energy Limited | London | 2017 |
| EPJ Ltd | Magherafelt | 2012 |
| EPL 001 Limited | London | 2020 |
| EPL 002 Limited | London | 2021 |
| EPL 003 Limited | London | 2025 |
| EPL 004 Limited | London | 2025 |
| EPL Dorset Limited | London | 2022 |
| EPL Leicestershire Limited | London | 2022 |
| EPL NEWCO10 Limited | London | 2022 |
| EPL NEWCO2 Limited | London | 2021 |
| EPL NEWCO3 Limited | London | 2021 |
| EPL NEWCO4 Limited | London | 2022 |
| EPL NEWCO7 Limited | London | 2022 |
| EPL NEWCO8 Limited | London | 2022 |
| EPL NEWCO9 Limited | London | 2022 |
| EPL Norfolk Limited | London | 2021 |
| Epoch Labs Ltd | London | 2025 |
| Epow Limited | Middlesbrough | 2026 |