| Ecotricity (Bulkworthy Solar) Limited | Energy | 2018 |
| Ecotricity (Butts Field) Limited | Energy | 2018 |
| Ecotricity (Cooles Farm Solar) Limited | Energy | 2021 |
| Ecotricity (Dalby Solar) Limited | Energy | 2018 |
| Ecotricity (Heck FEN Solar) Limited | Energy | 2021 |
| Ecotricity (Leechpool) Limited | Energy | 2019 |
| Ecotricity (Lodge Farm Solar) Limited | Energy | 2019 |
| Ecotricity (Smart Grid) Limited | Energy | 2018 |
| Ecotricity (Sparsholt Gasmill) Limited | Extraterritorial | 2017 |
| Ecotricity (Vegan Supplies) Ltd | Professional & scientific | 2019 |
| Ecotricity Battery Storage Limited | Energy | 2019 |
| Ecotricity BIZ Limited | Energy | 2021 |
| Ecotricity Bonds PLC | Administrative & support | 2010 |
| Ecotricity DE France Limited | Professional & scientific | 2009 |
| Ecotricity Generation Limited | Administrative & support | 1995 |
| Ecotricity Group Holdings Limited | Financial services | 2022 |
| Ecotricity Group Ltd | Professional & scientific | 1998 |
| Ecotricity Holding Company Limited | Manufacturing | 2017 |
| Ecotricity Limited | Energy | 1995 |
| Ecotricity Merchant Holdings Limited | Financial services | 2017 |
| Ecotricity New Ventures Limited | Professional & scientific | 2017 |
| Ecotricity Solar (Borrower) Limited | Energy | 2020 |
| Ecotricity Solar (Holdco) Limited | Energy | 2020 |
| Ecotricity Trading Limited | Energy | 2021 |
| Ecotricity Wind and Sun Parks (Holding) Limited | Financial services | 2014 |
| Ecotricity Wind and Sun Parks (Issuing) Limited | Financial services | 2014 |
| Ecowater Limited | Professional & scientific | 2003 |
| Ecrevisse Consulting Limited | Professional & scientific | 2013 |
| ED Lyon Limited | Health & social care | 2009 |
| Eddie Edwards Limited | Professional & scientific | 2015 |
| Eden Sculpture Limited | Arts & recreation | 2023 |
| Edgeworth Polo Partnership LLP | | 2019 |
| Edward Santana Ltd | Information & communication | 2013 |
| Efferent Ltd | Information & communication | 2026 |
| Egdon Resources Limited | Mining & quarrying | 2007 |
| Egdon Resources U.K. Limited | Mining & quarrying | 1997 |
| EJB Scaffolding Ltd | Construction | 2025 |
| Eleanor Capital Partners Limited | Financial services | 2013 |
| Electric Brighton CIC | Professional & scientific | 2018 |
| Electrical Development Services Limited | Manufacturing | 2018 |
| Electrical Solutions (Glos) Ltd | Construction | 2010 |
| Electronic Innovations Ltd | Professional & scientific | 2024 |
| Elementa Design Limited | Administrative & support | 2009 |
| Elements Gloucestershire Ltd | Construction | 2012 |
| Elena HAN Consulting Ltd | Professional & scientific | 2025 |
| Elephant Song Media Ltd | Information & communication | 2017 |
| Eleutheroi Limited | Manufacturing | 2008 |
| Eleven Developments (Cotswolds) Ltd | Construction | 2025 |
| Elkstone Distillery Ltd | Manufacturing | 2026 |
| Elkstone Grove Ltd | Real estate | 2019 |
| Elmer Court Limited | Real estate | 1999 |
| Elmtree Building Services Limited | Construction | 2024 |
| Elswick (Bridgend) Limited | | 1983 |
| Emaker Limited | Manufacturing | 2010 |
| Embrace Renewables Ltd | Financial services | 2025 |
| Emchajo Limited | Professional & scientific | 2019 |
| Emcos Rally Ltd | Arts & recreation | 2020 |
| Emerald Network Limited | Professional & scientific | 2006 |
| Emergence Commons CIC | Manufacturing | 2025 |
| EMF Detection & Surveys Ltd | Professional & scientific | 1999 |
| Emilia RAE Jewellery Ltd | Manufacturing | 2022 |
| Eminence Kitchens & Interiors Limited | Manufacturing | 2006 |
| Emitter Media Ltd | Manufacturing | 2024 |
| Emma K Ltd | Professional & scientific | 2024 |
| Emma Mcclarkin Global Consulting Ltd | Professional & scientific | 2019 |
| Emmely Gard Care Limited | Health & social care | 2019 |
| EN Core Pilates Ltd | Other services | 2018 |
| Enabledata Consulting Ltd | Information & communication | 2025 |
| Enabling Selling Limited | Professional & scientific | 2003 |
| Enderby Associates Limited | Professional & scientific | 2005 |
| Energia Consultants Limited | Professional & scientific | 1999 |
| Energy Transitions Analytics Ltd | Professional & scientific | 2022 |
| Engineered Wood Products Limited | Manufacturing | 2002 |
| Engineering and Fabrication Solutions Ltd | Manufacturing | 2012 |
| Enterprise IT & Security Solutions Limited | Information & communication | 2011 |
| Enviro Technology Pension Fund Nominees Limited | Financial services | 2000 |
| Epiphron Design Services Ltd | Professional & scientific | 2011 |
| Epsilonrf Ltd | Manufacturing | 2015 |
| EQUALS3 Ltd | Professional & scientific | 2023 |
| Equineearth Ltd. | Health & social care | 2018 |
| Erebus Trading Limited | Information & communication | 2016 |
| Erizo Engineering Ltd | Professional & scientific | 2013 |
| Eryq Ltd | Real estate | 2022 |
| Eryx Limited | Professional & scientific | 2014 |
| EST Electrical Ltd | Construction | 2021 |
| Euro Kool Solutions Limited | Transport & logistics | 2015 |
| Europetracks Ltd | Information & communication | 2026 |
| Evans Construction Ltd | Construction | 2013 |
| Evans White Associates Limited | Professional & scientific | 2016 |
| Eve's Cider Vinegar Ltd | Manufacturing | 2019 |
| Events Creator Ltd | Extraterritorial | 2019 |
| Evidose Biotics Ltd | Manufacturing | 2025 |
| Evolution Construction Management & Consultancy Ltd | Professional & scientific | 2025 |
| Ewan Associates Limited | Professional & scientific | 2014 |
| Executive Energy Limited | Administrative & support | 2007 |
| Exedra Nursery Limited | Wholesale & retail | 2020 |
| Experienced Management Consultants Limited | Professional & scientific | 2008 |
| Ezra Byrne Ltd | Information & communication | 2021 |
| F & D Accommodation Ltd | Real estate | 2021 |
| F&M Real Estate Investments Ltd | Real estate | 2024 |