| Entire Commercial Services Ltd | Professional & scientific | 2014 |
| Entrop Consultancy Services Ltd | Information & communication | 2014 |
| Environmental Control Partnership Limited | Construction | 1994 |
| Enviroverse C.I.C. | Professional & scientific | 2022 |
| Enzo's Restaurant Limited | Hospitality | 2018 |
| EOS Climate and Energy Ltd | Energy | 2020 |
| Epic Kayaks Europe Limited | Wholesale & retail | 2013 |
| EQ5 Limited | Education | 2001 |
| Equiesse Limited | Professional & scientific | 2007 |
| ERA Medical Ltd. | Wholesale & retail | 2022 |
| ESI Property Ltd | Real estate | 2022 |
| Esology Ltd | Professional & scientific | 2026 |
| Esomo Property Limited | Construction | 2023 |
| Esperante Limited | Administrative & support | 1986 |
| Essentia Mart Ltd | Wholesale & retail | 2024 |
| Essential Expertise Limited | Professional & scientific | 2010 |
| Etheridge Rigging Ltd | Construction | 2025 |
| Ethnic Roots Ltd | Wholesale & retail | 2019 |
| Eton Bridge Partners Limited | Administrative & support | 2010 |
| Eton College Services Limited | Hospitality | 1975 |
| Eton College Trustees Limited | Education | 1997 |
| Eton Community CIC | Arts & recreation | 2019 |
| Eton Office Solutions Ltd | Wholesale & retail | 2013 |
| Eton Online Ventures Limited | Extraterritorial | 2013 |
| Eton Repairs Ltd | Wholesale & retail | 1988 |
| Eton Riverside Management Limited | Extraterritorial | 1999 |
| Eton Spirits Ltd | Wholesale & retail | 2026 |
| Eton Stationers Ltd | Wholesale & retail | 2003 |
| Eton Strategic Solutions Limited | Administrative & support | 2024 |
| Eton Wick Quality Milk Producers Limited | Agriculture & fishing | 1964 |
| Eton-Southchurch Property Limited | Construction | 2016 |
| Etonworth Limited | Real estate | 2024 |
| Etonx Limited | Education | 2015 |
| Eudaimonia Global Limited | Administrative & support | 2020 |
| Euro-Agg (Holdings) Limited | Financial services | 2017 |
| Euro-Agg Limited | Wholesale & retail | 2021 |
| Euromex Ventures Limited | Administrative & support | 2001 |
| European Academy for Thoracic and Cardiac Surgery Limited | Education | 2004 |
| European School for Cardio-Thoracic Surgery Limited | Extraterritorial | 2003 |
| Euroscicon Limited | Information & communication | 2016 |
| Eurotech Industries Technical Services Limited | Administrative & support | 1996 |
| Evanbar Ltd | Administrative & support | 2021 |
| Event Draping Limited | Administrative & support | 2020 |
| Event Tank Ltd | Hospitality | 2022 |
| Everfresh Trading Ltd | Wholesale & retail | 2024 |
| Everjap Limited | Hospitality | 2016 |
| Everrati Advanced Technologies Ltd | Wholesale & retail | 2022 |
| Everrati Assets Limited | Wholesale & retail | 2019 |
| Everrati Automotive Limited | Wholesale & retail | 2019 |
| Everrati Group Limited | Financial services | 2019 |
| Evoke Smart Ltd | Wholesale & retail | 2026 |
| Evolve Hair (Berkshire) Limited | Other services | 2017 |
| Evys Property Limited | Real estate | 2016 |
| Excel Marble London Limited | Manufacturing | 2025 |
| Excelsior Projects Limited | Construction | 2017 |
| Expertrain Limited | Information & communication | 2023 |
| Exploration Excellence Ltd | Professional & scientific | 2023 |
| Expose Science Limited | Education | 2019 |
| Extra Mile International Sourcing Ltd | Wholesale & retail | 2026 |
| EYE Windsor Limited | Health & social care | 2008 |
| Eyebrow Consulting Limited | Professional & scientific | 2021 |
| Eyupaudio Ltd | Information & communication | 2014 |
| Ezcapes Limited | Hospitality | 2024 |
| Ezee Swim Limited | Arts & recreation | 2013 |
| Ezerigg Ltd | Manufacturing | 2023 |
| Ezetransport Limited | Transport & logistics | 2025 |
| Ezro Limited | Administrative & support | 2008 |
| F D'Souza Limited | Health & social care | 2014 |
| F Quercus Ltd | Professional & scientific | 2021 |
| F.C. Engineers Limited | Construction | 2008 |
| F27 Media Ltd | Information & communication | 2022 |
| Fabric (Maidenhead) Management Company Limited | Households | 2022 |
| Fabrizi Fine Art Ltd | Wholesale & retail | 2021 |
| Facet Management Limited | Wholesale & retail | 2009 |
| Faciology Aesthetics Limited | Health & social care | 2018 |
| Faciology Limited | Wholesale & retail | 2018 |
| Faiden Construction Ltd | Construction | 2023 |
| Faiden Developments Ltd | Financial services | 2023 |
| Fairacres Farm Limited | Agriculture & fishing | 1964 |
| Fairacres Residents Company (Harlington) Limited | Households | 1985 |
| Fairacres Services Ltd | Real estate | 2002 |
| Fairbairn Sykes Management Limited | Administrative & support | 2014 |
| Fairford Projects Ltd | Real estate | 2020 |
| Fairview Enterprises (Nuru) Ltd | Real estate | 2024 |
| Fairwyn Ltd | Professional & scientific | 2024 |
| FAN 365 Live Ltd | Other services | 2026 |
| Fantastic Property Management Ltd | Real estate | 2023 |
| FAR From Presents Limited | Information & communication | 2024 |
| Farley Huber Investments Ltd | Real estate | 2021 |
| Farnborough DRY Clean Limited | Other services | 2020 |
| Fast Interiors (Southern) Ltd | Construction | 2022 |
| Fcon Services Ltd | Administrative & support | 2025 |
| Feather and Blossom Media Ltd | Professional & scientific | 2021 |
| Fema Global Ltd | Other services | 2021 |
| Fenton Digital Ltd | Professional & scientific | 2018 |
| Fern Acre Gardens (Northwood) Management Company Limited | Households | 2018 |
| Fernhill Partners Ltd | Professional & scientific | 2023 |
| Ferredi Ltd | Administrative & support | 2022 |
| FGS Entertainment Ltd | Arts & recreation | 2025 |
| Fidelis Petcare Limited | Manufacturing | 2020 |