| F.B.O. L'Urcher LLP | | 2013 |
| F.Neza Ltd | Construction | 2015 |
| F20UEL Consulting Limited | Wholesale & retail | 2023 |
| Fabiom Ltd | Administrative & support | 2026 |
| Facelift Home Improvements Ltd | Construction | 2005 |
| Facelift Properties Ltd | Real estate | 2022 |
| Facility Solutions Limited | Construction | 2000 |
| Faderz Studio Ltd | Other services | 2023 |
| Fahim Habib Limited | Wholesale & retail | 2020 |
| Fair Accountants Ltd | Professional & scientific | 2024 |
| Fairbrother Studios Ltd | Professional & scientific | 2020 |
| Fairest Consulting Ltd | Professional & scientific | 2018 |
| Fairfield Holiday Club Owners Limited | Real estate | 1979 |
| Fairwater Limited | Administrative & support | 1997 |
| Fairy’S Hands Aesthetics Ltd | Other services | 2026 |
| Falconwood Capital Ltd | Professional & scientific | 2026 |
| FAM Traders Ltd | Transport & logistics | 2018 |
| Famebart Property Limited | Real estate | 1982 |
| Family Avenues Ltd | Health & social care | 2025 |
| Fanta Services Limited | Transport & logistics | 2019 |
| Farmzila Limited | Manufacturing | 2017 |
| Farodeals Limited | Wholesale & retail | 2022 |
| Farol Dinis Ltd | Hospitality | 2021 |
| Farra Tradings Ltd | Wholesale & retail | 2021 |
| Fashion MIX Official Ltd | Wholesale & retail | 2025 |
| Fast Romeo Service Ltd | Transport & logistics | 2020 |
| Fastbyte Consultancy Limited | Information & communication | 2010 |
| Fastrailticketing Group Limited | Professional & scientific | 2009 |
| Fastrailticketing Limited | Wholesale & retail | 2008 |
| Father and Daughter Limited | Health & social care | 2022 |
| Favorite Chicken Crawley Ltd | Hospitality | 2020 |
| FAZ Retail Ltd | Wholesale & retail | 2026 |
| FCC Holdings Limited | Real estate | 2020 |
| FCM Healthcare Ltd | Health & social care | 2016 |
| FDF Properties Dubai Ltd | Real estate | 2024 |
| FDF Properties Ltd | Real estate | 2019 |
| Feats.Live CIC | Information & communication | 2025 |
| FED UP Media Limited | Professional & scientific | 2020 |
| Feedback Instruments Limited | Wholesale & retail | 2012 |
| Felicity Wells Hair Ltd | Other services | 2017 |
| Fellow Technologies Ltd | Extraterritorial | 2013 |
| Fellows Investments Limited | Financial services | 2020 |
| Femmere Ltd. | Wholesale & retail | 2024 |
| FEN Place Construction Ltd | Construction | 2024 |
| FEN Place Farm Ltd | Real estate | 2024 |
| Fenchurch Global Limited | Information & communication | 2019 |
| Fenchurch Park Limited | Information & communication | 2018 |
| Fenchurch Training Limited | Other services | 2017 |
| Fenix Cars Gatwick Ltd | Transport & logistics | 2024 |
| Fenix Cars Limited | Transport & logistics | 2023 |
| Fenton Business Sales Ltd | Real estate | 2018 |
| Fergussons Auto Services (Surrey) Limited | Wholesale & retail | 2013 |
| Fermor Stone Ltd | Construction | 2007 |
| Fernando Bros Limited | Wholesale & retail | 2025 |
| Fernando Private Limited | Wholesale & retail | 2021 |
| Fernando Sons Limited | Wholesale & retail | 2022 |
| Ferox Logistics Ltd | Construction | 2021 |
| Ferrari Entertainment Ltd | Information & communication | 2022 |
| FGS Force Ltd | Hospitality | 2025 |
| FHU Jacek Adamczewski Limited | Wholesale & retail | 2024 |
| Fifteen Fonnereau Road Management Company Limited | Households | 2005 |
| FIG Tree Trading Ltd | Wholesale & retail | 2015 |
| Fight Media Ltd | Education | 2019 |
| Filink Logistics Ltd | Transport & logistics | 2025 |
| Filipino Exotic Foods UK Ltd | Wholesale & retail | 2021 |
| Films & Storys Ltd | Information & communication | 2026 |
| FIN Propco Limited | Real estate | 2024 |
| Finalis Planum Ltd | Professional & scientific | 2025 |
| Financial Investigations for Non-Profit Design | Public administration | 2020 |
| Financialjuice Limited | Information & communication | 2016 |
| Finaria Capital Limited | Professional & scientific | 2025 |
| Finding a CAB Ltd | Transport & logistics | 2025 |
| Fine Windows Limited | Extraterritorial | 2015 |
| Fine-Tuned Wardrobe Ltd | Other services | 2020 |
| Fininfo Limited | Information & communication | 2016 |
| FIP Ltd | Information & communication | 2009 |
| Firdene Limited | Professional & scientific | 2018 |
| Fire & Security Limited | Extraterritorial | 1998 |
| Fire ANT Consulting Ltd | Professional & scientific | 2012 |
| Fire Compliance London Ltd | Public administration | 2025 |
| Fire Containment Limited | Professional & scientific | 2009 |
| Fire FOX Extinguishers Limited | Professional & scientific | 2010 |
| Fire Risk Assessments Limited | Professional & scientific | 1999 |
| Fireaway Northgate Limited | Hospitality | 2026 |
| Fireaway RH10 Ltd | Hospitality | 2026 |
| Firelabuk Ltd | Professional & scientific | 2025 |
| Firs Premier Limited | Health & social care | 2012 |
| First Avenue Investments Ltd | Real estate | 2026 |
| First Class Sports and Marketing Limited | Other services | 2014 |
| First Digital Trust (Europe) Limited | Information & communication | 2012 |
| First Edition Property Ltd | Construction | 2024 |
| First Health Check Ltd | Health & social care | 2020 |
| First Placement Ltd | Administrative & support | 2023 |
| First Spartan Security Limited | Administrative & support | 2021 |
| First World Rigging Ltd | Administrative & support | 2022 |
| First World Tours and Travel Ltd | Hospitality | 2006 |
| First-In Emergency Services Ltd | Health & social care | 2015 |
| Firstcol Group Ltd | Professional & scientific | 2015 |
| Firstcol Limited | Health & social care | 2013 |
| Firstcol Services Limited | Administrative & support | 2005 |