| EEB82 Limited | Weybridge | 2023 |
| EEB83 Limited | Weybridge | 2023 |
| EEB84 Limited | Weybridge | 2023 |
| EEB85 Limited | Weybridge | 2023 |
| EEB86 Limited | Weybridge | 2023 |
| EEB87 Limited | Weybridge | 2023 |
| EEB88 Limited | Weybridge | 2023 |
| EEB89 Limited | Weybridge | 2023 |
| EEB9 Limited | Weybridge | 2014 |
| EEB90 Limited | Weybridge | 2023 |
| EEB91 Limited | Weybridge | 2023 |
| EEB92 Limited | Weybridge | 2023 |
| EEB93 Limited | Weybridge | 2023 |
| EEB94 Limited | Weybridge | 2023 |
| EEB95 Limited | Weybridge | 2023 |
| EEB96 Limited | Weybridge | 2023 |
| EEB97 Limited | Weybridge | 2023 |
| EEB98 Limited | Weybridge | 2023 |
| EEB99 Limited | Weybridge | 2023 |
| EEC Power Systems Ltd | Sudbury | 2012 |
| EEC Solutions Global Limited | Sunderland | 2017 |
| EEC Solutions Limited | Sunderland | 2016 |
| EEL Group Ltd | London | 2023 |
| Eelpower Limited | London | 2017 |
| Eendee Electrical Services Ltd | Biggin Hill | 2017 |
| Eenergy Consultancy Limited | Leicester | 1999 |
| EES Operations 1 Limited | London | 2010 |
| EET H2 Power Limited | Ellesmere Port | 2024 |
| EET Hydrogen Power Limited | Ellesmere Port | 2024 |
| EF Electrical Ltd | Eastleigh | 2019 |
| Effective Air Holdings Limited | Chester | 2018 |
| Effective Air Solutions Limited | Chester | 2008 |
| Effective Cooling Ltd | Halifax | 2019 |
| Effective Power Limited | Melton Mowbray | 2021 |
| Effective Renewables Ltd | Leicester | 2017 |
| Effen Ltd | Oxford | 2025 |
| Effictra Technologies Ltd | Manchester | 2026 |
| Effortless Energy Ltd. | Crewe | 2013 |
| EFG Energy Limited | Cwmbran | 2026 |
| Efs-Services Ltd | Swansea | 2014 |
| EG Business Solution Ltd | London | 2013 |
| EG Power Limited | Swansea | 2017 |
| EG UK Development Limited | Bristol | 2024 |
| Egec Holdings Limited | Edinburgh | 2015 |
| EGH ES (N.I.) Limited | Derry | 2016 |
| Egmanton Solar Park Limited | Exeter | 2013 |
| Egmere Airfield Solar Park Limited | Kings Langley | 2012 |
| Egmere Energy Limited | Guildford | 2013 |
| Egnedol Pembroke Eco-Power Limited | Milford Haven | 2014 |
| Egni Eirian Energy CYF | Barmouth | 2014 |
| Egremont Solar Farm Limited | Derby | 2021 |
| EH21 Limited | Glasgow | 2023 |
| EIB Fusion Energy Trading Limited | London | 2021 |
| Eider Energy Ltd | Edinburgh | 2023 |
| Eider Renewables Limited | London | 2013 |
| Eigg Electric Limited | Invernessshire | 2005 |
| Eight Towers Energy Ltd | Radstock | 2025 |
| Eilean Siar Energy Ltd | Stornoway | 2025 |
| Eirflow Ltd | Chesterfield | 2026 |
| EIS Midlands Limited | Tewkesbury | 2010 |
| Eitten Ltd | Lanark | 2012 |
| EKL Energy Limited | Leicestershire | 2017 |
| Eklipse Air Conditioning and Ventilation Specialist Ltd | Nottingham | 2009 |
| Ekon Smart Systems Limited | Sandhurst | 2012 |
| EL (West Weybridge) Limited | London | 2021 |
| Elan Greentech (UK) Limited | Hayes | 2025 |
| ELD Project Co Elstree Limited | London | 2025 |
| Elean Energy Limited | Christchurch | 2018 |
| Elean Laser Energy Limited | Christchurch | 2018 |
| Elec Safe Solutions Limited | Wynyard | 2025 |
| Elec Services and Maintenance Ltd | Birmingham | 2012 |
| Elec TEK Installations Ltd | Cardiff | 2010 |
| Eleclink Limited | London | 2011 |
| Elecluz Limited | Cambridge | 2013 |
| Elecmech Consultancy Limited | Bristol | 2005 |
| Elecrite Limited | Manchester | 2002 |
| Elecsecure Ltd | Diss | 2012 |
| Elect-Rick's Installation & Maintenance Ltd | Wolverhampton | 2020 |
| Electech Trading Ltd | London | 2020 |
| Electra Air Limited | Eastleigh | 2022 |
| Electrasol Ltd | London | 2023 |
| Electratest Yorkshire Limited | South Yorkshire | 2003 |
| Electrhodes Ltd | London | 2024 |
| Electric 4 YOU Ltd | Saundersfoot | 2025 |
| Electric Avenue Energy Ltd | London | 2018 |
| Electric Avenue Ltd | London | 2011 |
| Electric Bill Services Limited | Leven | 2017 |
| Electric Energy Ltd | Wembley | 2018 |
| Electric Hill Limited | High Wycombe | 2019 |
| Electric Light and Shade Limited | Edinburgh | 2017 |
| Electric Line Uk's Ltd | Bradford | 2022 |
| Electric Rallyst Limited | London | 2016 |
| Electric Tech Ltd | London | 2011 |
| Electrical Innovations (South West) Limited | Chippenham | 2006 |
| Electrical Inspection Solutions Limited | Linton | 2009 |
| Electrical Plus Services Limited | Ongar | 2016 |
| Electrical Solutions (Warrington) Ltd | Warrington | 2008 |
| Electricalse Ltd | Woking | 2024 |
| Electricert Limited | Wirral | 2006 |
| ELECTRICIAN-4U Ltd | Deal | 2014 |