| European Aligner Society | Education | 2014 |
| European Waterways Group Limited | Professional & scientific | 2011 |
| European Waterways Limited | Administrative & support | 1977 |
| Evectra Limited | Administrative & support | 2012 |
| Everall Rolfe Associates Limited | Financial services | 1982 |
| Everslet Insurance Services (Maidenhead) Limited | Financial services | 1985 |
| Everstream Analytics Limited | Financial services | 2021 |
| Every Small Story Limited | Professional & scientific | 2025 |
| Evolve Advisory Services Limited | Professional & scientific | 2009 |
| Evolve Waste Solutions Limited | Water & waste | 2022 |
| Evores Limited | Construction | 2022 |
| Exclusive UK Properties Limited | Construction | 2017 |
| Experienta Property Limited | Real estate | 2019 |
| Extensity Consulting Ltd | Professional & scientific | 2014 |
| Exterior Solutions Limited | Wholesale & retail | 2011 |
| External Wall Systems Limited | Construction | 2021 |
| Extreme Channel Limited | Information & communication | 2018 |
| EYE Will Limited | Wholesale & retail | 2021 |
| F a Magee & Company Limited | Professional & scientific | 2020 |
| Facade Revolution Limited | Construction | 2021 |
| Fair Price Builders Ltd | Construction | 2024 |
| Fairven Limited | Information & communication | 2024 |
| Fairview Developments (TFB) Limited | Real estate | 2008 |
| Falcon Arms Ltd | Construction | 2015 |
| Falcon Electrical Services Ltd | Construction | 2020 |
| Family Angels Ltd | Extraterritorial | 2009 |
| Fancensus.Com Limited | Information & communication | 2008 |
| Far'N'Wide Inc Ltd | Professional & scientific | 2026 |
| Farm Heating Supplies Limited | Agriculture & fishing | 2014 |
| Farm Lane Properties Ltd | Real estate | 2023 |
| Fast Forward Speakers Limited | Professional & scientific | 2015 |
| Fast Homebuyers Limited | Real estate | 2010 |
| Fast Lane Cars Limited | Administrative & support | 2016 |
| Fast Systems Limited | Manufacturing | 1983 |
| Fast Track Interiors Ltd | Construction | 2006 |
| FBN Services Limited | Administrative & support | 2022 |
| FDG Naletsana Limited | Health & social care | 2022 |
| FDM Aviation Ltd | Information & communication | 2021 |
| Feilden Fowles Architects Limited | Administrative & support | 2015 |
| Felix EM Systems Ltd | Professional & scientific | 2005 |
| Feltham Capital Limited | Financial services | 2024 |
| Feltham IP Limited | Other services | 2024 |
| Feminia Publishing Ltd | Wholesale & retail | 2026 |
| Ferrata Ltd | Real estate | 2015 |
| Fetchr Ltd | Information & communication | 2019 |
| Feyre London Ltd | Hospitality | 2019 |
| Filberto Limited | Wholesale & retail | 2024 |
| Filmtek Data Solutions Limited | Professional & scientific | 2023 |
| Filmworks Media Limited | Professional & scientific | 2010 |
| Finance Gems Limited | Professional & scientific | 2015 |
| Finch Lane Residents Association Limited | Households | 1976 |
| Fine Art Source Limited | Information & communication | 2013 |
| Finerva Holdings Limited | Financial services | 2020 |
| Finerva Troon Ltd | Financial services | 2025 |
| Finitie Ltd | Professional & scientific | 2024 |
| Finops Partners Limited | Professional & scientific | 2025 |
| Finquip Limited | Information & communication | 2015 |
| Finsaga Limited | Other services | 2000 |
| Firedrake ERP Ltd | Administrative & support | 2012 |
| Firexo Cotm Limited | Professional & scientific | 2021 |
| Firexo Distribution Limited | Public administration | 2021 |
| Firexo Holdings Limited | Professional & scientific | 2021 |
| Firexo Motorsport Limited | Public administration | 2020 |
| Firexo SCM Limited | Manufacturing | 2021 |
| First 4 Service Automotive Limited | Wholesale & retail | 2005 |
| First Fire Protection Limited | Construction | 1983 |
| First Fire Services Limited | Construction | 1986 |
| First Point Technology Limited | Other services | 2011 |
| First Testing Solutions Limited | Information & communication | 2014 |
| Flashman Advisory Ltd | Professional & scientific | 2025 |
| Flashman Investments Ltd | Financial services | 2017 |
| Fleet (Beaconsfield) Ltd | Transport & logistics | 2009 |
| Flexible Technology Solutions UK Limited | Administrative & support | 2011 |
| Flexilaw Limited | Extraterritorial | 1996 |
| Flexitech Group Limited | Administrative & support | 2024 |
| Flightmind.Ai Ltd | Information & communication | 2024 |
| Fliix Limited | Information & communication | 2025 |
| Flint & Vale Spirits Ltd | Manufacturing | 2026 |
| Flint RAE Limited | Professional & scientific | 2026 |
| Flowcap Ltd | Financial services | 2024 |
| FMG (Cobham) Ltd | Construction | 2023 |
| Fonna Consulting Limited | Professional & scientific | 2025 |
| Foosey UK Ltd | Professional & scientific | 2022 |
| Forest END Properties Limited | Real estate | 2020 |
| Formative Content Limited | Professional & scientific | 2014 |
| Formative Content Trustee Limited | Administrative & support | 2021 |
| Fortis Global Real Estate Limited | Real estate | 2025 |
| Forty Green Energy Limited | Professional & scientific | 2009 |
| Forum Films Limited | Information & communication | 2023 |
| Found by Felicity Ltd | Administrative & support | 2023 |
| Fourstate Ltd | Wholesale & retail | 2019 |
| Fowler Supplies Limited | Wholesale & retail | 2022 |
| FOX Business Enterprises Ltd | Hospitality | 2017 |
| Foxlands Close Management Company Limited | Households | 1992 |
| FPT Commercial Properties LLP | | 2010 |
| FRA Consultants Limited | Professional & scientific | 2025 |
| Francesca Cairns Image Consultant Limited | Other services | 2023 |
| Francine Properties Limited | Real estate | 1956 |
| Franks Coffee Ltd | Hospitality | 2022 |
| Franks Coffee Truck Ltd | Hospitality | 2021 |