| Emily MAY Media Ltd | Professional & scientific | 2024 |
| Emmerson Page Limited | Real estate | 2013 |
| Empowered Online Limited | Professional & scientific | 2020 |
| Enaero Ltd | Professional & scientific | 2023 |
| Endcliffe Building and Renovations Limited | Construction | 2024 |
| Endeavour Publishing Limited | Professional & scientific | 2011 |
| Energy Alignment Ltd | Arts & recreation | 2021 |
| Engineering Electrics Ltd | Construction | 2011 |
| Enigma Building Services Consultancy Limited | Professional & scientific | 2017 |
| Ensor 917 Facilities Contractors Ltd | Administrative & support | 2025 |
| Entec Novare Limited | Information & communication | 2006 |
| Enton Ltd | Construction | 2023 |
| EPH Contractors (Swindon) Limited | Extraterritorial | 1959 |
| EPI 2000 Limited | Professional & scientific | 2007 |
| EPI 3000 Limited | Professional & scientific | 2019 |
| Epistemic Systems Limited | Information & communication | 2016 |
| Equalmulti Limited | Extraterritorial | 1990 |
| Equiamore Holdings Ltd | Wholesale & retail | 2025 |
| Equilibrium Innovation Ltd | Professional & scientific | 2025 |
| Equitalent Ventures Ltd | Agriculture & fishing | 2026 |
| Eridani Holdings Ltd | Real estate | 2025 |
| ES Kebab Limited | Hospitality | 2025 |
| Essen Bioscience Limited | Manufacturing | 2007 |
| Essex Sealants Ltd | Construction | 2015 |
| Eternit UK Limited | Real estate | 1926 |
| Eton Lodge (Management) Limited | Households | 1981 |
| Etonminster Property Management Limited | Households | 1996 |
| Euro Soft Drinks Limited | Wholesale & retail | 2023 |
| European Renewables Limited | Professional & scientific | 1998 |
| Evans Property Services Limited | Manufacturing | 2002 |
| Event Partners Consulting Ltd | Professional & scientific | 2024 |
| Everydays Household Goods Limited | Wholesale & retail | 2011 |
| Evron Wharf Hertford Management Limited | Households | 2014 |
| Ewitda Limited | Financial services | 2025 |
| Excellent Nails Limited | Other services | 2026 |
| Expert Mortgages Herts & Cambs Ltd | Financial services | 2020 |
| External Plumbing Services Limited | Professional & scientific | 2014 |
| Extract Information Limited | Professional & scientific | 2013 |
| Extraordinary Communication Limited | Information & communication | 1999 |
| F & R Decorators Ltd | Construction | 2016 |
| F-Tech Precision Engineering Limited | Manufacturing | 2021 |
| F.A. Rogers and SON Limited | Agriculture & fishing | 1963 |
| Fairmount Data Systems Limited | Information & communication | 2011 |
| Fairplay After School Club Limited | Health & social care | 2014 |
| Fairway Mortgage Solutions Limited | Financial services | 2024 |
| Fallon Maintenance Ltd | Construction | 2018 |
| Fani Limited | Health & social care | 2017 |
| FARBRO5 Ltd | Professional & scientific | 2026 |
| Farm Biomethane Limited | Financial services | 2024 |
| Farm Fitness Products Limited | Arts & recreation | 2016 |
| Farm Renewables Limited | Professional & scientific | 2007 |
| Farm Renewables Projects Limited | Professional & scientific | 2018 |
| Fashionbrandz Limited | Wholesale & retail | 2017 |
| Fasnacloich Estates Limited | Agriculture & fishing | 1955 |
| Fastcad Design Engineering Limited | Information & communication | 2002 |
| FAT JAX Limited | Hospitality | 2025 |
| FDX Limited | Professional & scientific | 2017 |
| Fedichi Limited | Manufacturing | 2016 |
| Fenners Lawn Residents Association Limited | Households | 1973 |
| Fennhiggins Live Solutions Ltd | Administrative & support | 2025 |
| Ferrari Creative Limited | Information & communication | 2025 |
| Fibre-Tech Industries (UK) Limited | Manufacturing | 2015 |
| FIBRE4TV Limited | Manufacturing | 2013 |
| Field Estimation Ltd | Information & communication | 2026 |
| Final Detail Ltd | Wholesale & retail | 2019 |
| Final Finish Flooring Limited | Construction | 2023 |
| Finbrook Property Group Ltd | Construction | 2024 |
| Fine Art Finder Ltd | Wholesale & retail | 2024 |
| Fineterm Property Management Limited | Professional & scientific | 1987 |
| Finsbury House Securities Limited | Financial services | 2009 |
| First Instruments Limited | Extraterritorial | 2008 |
| First Pages Editorial Consultancy Ltd | Information & communication | 2022 |
| First-Rate Learning Ltd | Education | 2017 |
| Fish 'N' Chick'N Royston Limited | Hospitality | 2012 |
| Fitter Group Limited | Professional & scientific | 2025 |
| Five Pillar Coaching Ltd | Health & social care | 2022 |
| Fixalluk Limited | Wholesale & retail | 2026 |
| Flamingo House Management Limited | Real estate | 2013 |
| Flibtravel International UK Limited | Transport & logistics | 2024 |
| Flies and Angels Limited | Information & communication | 2015 |
| Florfield Passage Limited | Households | 2003 |
| Floweressence CGH Limited | Health & social care | 2007 |
| FLR Decor & Maintenance Ltd | Construction | 2025 |
| Fluidic Sciences Limited | Manufacturing | 2018 |
| Fluxomate Ltd | Extraterritorial | 2023 |
| Fogma Ltd | Wholesale & retail | 2012 |
| Folknoll Enterprise LLP | | 2024 |
| Folknoll Group Limited | Administrative & support | 2014 |
| Food Intelligence Limited | Professional & scientific | 2022 |
| Foodabout Limited | Hospitality | 2022 |
| Football Finery Limited | Wholesale & retail | 2022 |
| Football Finery Services Limited | Wholesale & retail | 2025 |
| Football FUN Factory (Community 003) Limited | Education | 2019 |
| Fordec Holdings Limited | Real estate | 2025 |
| Forlulu Ltd | Wholesale & retail | 2025 |
| Foulger's (CVS) Limited | Manufacturing | 2003 |
| Foundation Premier League Ltd | Arts & recreation | 2023 |
| Four Duxford Ltd | Hospitality | 2025 |
| Fowlmere Asset Management Limited | Financial services | 2017 |
| Fowlmere Cafe Ltd | Hospitality | 2021 |