| Exjs Estates Ltd | Real estate | 2016 |
| Expert Build and Maintenance Services Ltd. | Construction | 2010 |
| Experts Construction Limited | Construction | 2026 |
| Explaining Pain Ltd | Health & social care | 2015 |
| Expol Services Ltd | Administrative & support | 2011 |
| Express Fabrics Limited | Wholesale & retail | 2008 |
| Express Plumber Limited | Construction | 2013 |
| Extract International Ltd | Arts & recreation | 2026 |
| Extreme Nutrition Store Ltd | Wholesale & retail | 2009 |
| Eyecare Capital Limited | Health & social care | 2019 |
| Eymen Hornchurch Ltd | Hospitality | 2025 |
| Eypo Ltd | Wholesale & retail | 2026 |
| Ezra & Macquarie Limited | Extraterritorial | 2011 |
| F R Roofing Limited | Construction | 2014 |
| F&B Builders Ltd | Construction | 2024 |
| F&E Property Development Ltd | Real estate | 2022 |
| F&P Consulting Limited | Information & communication | 2017 |
| F.G.Fixing Ltd | Construction | 2019 |
| FAB GAS Services Ltd | Construction | 2026 |
| Fabine Limited | Health & social care | 2025 |
| Fabpro Ltd | Hospitality | 2024 |
| Facade Partnerships Limited | Extraterritorial | 2023 |
| Facial Gym Ltd | Other services | 2014 |
| Fade Zone RM11 Ltd | Other services | 2025 |
| Fadey Ventures Limited | Real estate | 2021 |
| Failte Property Services Ltd | Real estate | 2019 |
| Fain Cleaning Ltd | Administrative & support | 2026 |
| Fairclean Limited | Other services | 2006 |
| Fairclean Properties Ltd | Real estate | 2025 |
| Faircross Properties Limited | Real estate | 2023 |
| Faircross Services Ltd | Construction | 2019 |
| Fairhaven Private Holdings Ltd | Financial services | 2026 |
| Fairlane Property Limited | Real estate | 2022 |
| Fairline London Ltd | Other services | 2013 |
| Fairmead Group Limited | Financial services | 2016 |
| Fairway Trading Intl Ltd | Wholesale & retail | 2025 |
| Faith Academy Ltd | Education | 2024 |
| Faith Ashenden Ltd | Health & social care | 2026 |
| Faith Education Ltd | Education | 2026 |
| Faith in Skin Ltd | Other services | 2026 |
| Falcor Consultancy Ltd | Other services | 2016 |
| Falkirk Court Limited | Households | 1970 |
| Fall Trading Limited | Wholesale & retail | 2025 |
| Famident Ltd | Health & social care | 2022 |
| Family 1ST Services Limited | Education | 2015 |
| Faraday Holistics Ltd | Other services | 2024 |
| Farhad Mashadi Limited | Health & social care | 2020 |
| Farhan Malik Limited | Health & social care | 2025 |
| Farmer BOY Limited | Wholesale & retail | 2021 |
| Fashion Architecture Taste (FAT) Limited | Professional & scientific | 1995 |
| Fashionbyesther Ltd | Wholesale & retail | 2022 |
| Fast Brick Ltd | Construction | 2020 |
| Fast Shield Packaging Limited | Manufacturing | 1995 |
| Fast Track Insulation Services Limited | Construction | 2019 |
| Fateh Builders Limited | Construction | 2026 |
| Fatema Housing Ltd | Construction | 2025 |
| Father's House Company Limited | Health & social care | 2014 |
| Favour Consultancy Limited | Health & social care | 2018 |
| FAY Foods Ltd | Hospitality | 2019 |
| Fayni Build Group Ltd | Construction | 2026 |
| FBF Engineering Limited | Administrative & support | 2013 |
| FBM Catering Limited | Hospitality | 2025 |
| Fectum London Limited | Construction | 2018 |
| FEL Property Developments Ltd | Real estate | 2024 |
| Feliana Holdings Ltd | Real estate | 2024 |
| Femron Limited | Real estate | 2021 |
| Fenovy (UK) Limited | Health & social care | 2020 |
| Feore Support Limited | Administrative & support | 2013 |
| Fernandes & Co Consultancy Ltd | Financial services | 2015 |
| Fernhill Consulting House (UK) Ltd | Professional & scientific | 2024 |
| Fernutrition Ltd | Health & social care | 2017 |
| Fero Developments Ltd | Real estate | 2020 |
| Ferodent Ltd | Health & social care | 2025 |
| Ferreira Investments Limited | Financial services | 2021 |
| FG Barbers (Hornchurch) Ltd | Other services | 2025 |
| FG Drylining Ltd | Construction | 2025 |
| FGZ Ltd | Real estate | 2025 |
| FHB Property Partnership LLP | | 2011 |
| FHP International Limited | Professional & scientific | 1988 |
| Fibs-Fx Ltd | Professional & scientific | 2023 |
| Fidal Limited | Extraterritorial | 2018 |
| Fifie Ltd | Professional & scientific | 2019 |
| Fikraft Limited | Real estate | 2020 |
| Fikunfikemi Ltd | Real estate | 2022 |
| Filmbr Limited | Other services | 2024 |
| Financial Investigation and Recovery Ltd | Financial services | 2015 |
| Financial Literacy and Education Consulting Limited | Professional & scientific | 2023 |
| Finca SAM Ltd | Construction | 2025 |
| Fine Edge Cricket Limited | Arts & recreation | 2015 |
| Fine Grub Wines and Beers Limited | Hospitality | 2024 |
| Finesse Literary Press Ltd | Information & communication | 2023 |
| Finesse Tech Laboratory Limited | Health & social care | 2020 |
| Finesse Window Services Ltd | Construction | 2005 |
| Finest Building Services Ltd | Construction | 2019 |
| Finnbar Properties Limited | Real estate | 2025 |
| Fintechlex Ltd | Professional & scientific | 2024 |
| Fire Door Controls Limited | Public administration | 2025 |
| Fire Door London Limited | Construction | 2015 |
| Fireprodac Ltd | Public administration | 2025 |
| First Affair Ltd | Wholesale & retail | 2018 |