| FBF Medical Instruments Limited | Information & communication | 2023 |
| FBP Homes Ltd | Real estate | 2025 |
| FBQ Ltd | Wholesale & retail | 2020 |
| FC Electrics Services Limited | Construction | 2016 |
| Fcpas Limited | Professional & scientific | 2012 |
| FCR Glazing Ltd | Construction | 2023 |
| Fcrpropertiesuk Limited | Construction | 2024 |
| FDM Professional Services Limited | Information & communication | 2018 |
| Feature Dealer Limited | Real estate | 2025 |
| February 10 Limited | Real estate | 2026 |
| Fedora and Sons Limited | Administrative & support | 2021 |
| Feel Laban UK Ltd | Wholesale & retail | 2026 |
| Feelfine Holdings Limited | Professional & scientific | 2002 |
| Feelings Essentials Limited | Wholesale & retail | 2026 |
| Feelum Ltd | Wholesale & retail | 2021 |
| Feery Properties Ltd | Real estate | 2020 |
| Feetfirst Healthcare Ltd | Health & social care | 2019 |
| Fego Group Ltd | Administrative & support | 2026 |
| Feiers Builders Ltd | Construction | 2014 |
| Felbrigge Accountancy Ltd | Professional & scientific | 2002 |
| Felmore Retail Limited | Wholesale & retail | 2011 |
| Felorix Limited | Wholesale & retail | 2026 |
| Femmistry Ltd | Wholesale & retail | 2025 |
| FEN Global Limited | Education | 2024 |
| Fencepiece Films Ltd | Information & communication | 2024 |
| Fencor Limited | Construction | 2013 |
| Fencourt Energy Ltd | Construction | 2024 |
| Fencourt Heat and Power Ltd | Professional & scientific | 2025 |
| Fencourt Holdings Limited | Financial services | 2017 |
| Fencourt Theta Ltd | Professional & scientific | 2025 |
| Feng Ning Limited | Administrative & support | 2026 |
| Feni Funeral UK Ltd | Other services | 2022 |
| Feniksconstruction Ltd | Construction | 2018 |
| Fenix Equity Limited | Real estate | 2024 |
| Fenix Protection Limited | Administrative & support | 2023 |
| Fenix Rail Group Ltd | Professional & scientific | 2026 |
| Fenix Retail Limited | Wholesale & retail | 2023 |
| Fenlock Investments Limited | Hospitality | 1960 |
| Fennec Property Investments Ltd | Real estate | 2018 |
| Fennel Spice Limited | Hospitality | 2025 |
| Fenomenthal Construction Ltd | Construction | 2025 |
| Fenshav Limited | Real estate | 1998 |
| Ferati Brothers Ltd | Construction | 2026 |
| Ferati Group Ltd | Construction | 2022 |
| Ferdous Health Research Consultancy Ltd | Professional & scientific | 2020 |
| Fern Leaf Care Ltd | Health & social care | 2018 |
| Fern Leaf Carehome Limited | Health & social care | 2019 |
| Fernandez Trading Ltd | Wholesale & retail | 2011 |
| FERNANDEZ1 Constructions Limited | Construction | 2025 |
| Fernweh Travels Limited | Administrative & support | 2020 |
| Feroz Limited | Wholesale & retail | 2019 |
| Ferraz Transport Ltd | Transport & logistics | 2025 |
| Festival Catering Ltd | Hospitality | 2015 |
| Festival of Spice Limited | Hospitality | 2019 |
| Fetcham Property Holdings Limited | Real estate | 2026 |
| Fets Learning Ltd | Education | 2016 |
| Feudum Property Developments Ltd | Real estate | 2012 |
| Fewell Tools Co., Ltd | Wholesale & retail | 2025 |
| Fexson Solutions Ltd | Wholesale & retail | 2024 |
| Feye Limited | Wholesale & retail | 2025 |
| FEZ Mangal Limited | Extraterritorial | 2013 |
| FF Trading Ltd | Wholesale & retail | 2022 |
| FFC Felixstowe Ltd | Hospitality | 2026 |
| FG Barbers (Ilford) Limited | Other services | 2023 |
| FG Barbers (London) Limited | Other services | 2026 |
| FG Barbers Limited | Other services | 2021 |
| FGL Consulting Limited | Professional & scientific | 2010 |
| FGL Holdings (Malta) Ltd | Financial services | 2023 |
| FGL Holdings Ltd | Financial services | 2023 |
| FGR Welding Construction Ltd | Manufacturing | 2020 |
| FGR15 Ltd | Administrative & support | 2015 |
| Fgrs Services Limited | Wholesale & retail | 2022 |
| FGS Construction Ltd | Construction | 2021 |
| FH Hospitality Essex Limited | Hospitality | 2025 |
| FH Pharma Consultants Ltd | Professional & scientific | 2019 |
| Fhamm Ltd | Professional & scientific | 2018 |
| Fhfm Property Ltd | Real estate | 2019 |
| Fhisz Holdings Limited | Professional & scientific | 2019 |
| FHT Property Ltd | Real estate | 2020 |
| FI Probuilding Limited | Construction | 2025 |
| Fiat Vogue Limited | Wholesale & retail | 2019 |
| Fibre & Datacomm Limited | Information & communication | 2018 |
| FIC Chauffeurs Ltd | Transport & logistics | 2026 |
| Ficas Accounting Ltd. | Professional & scientific | 2021 |
| Fida London Limited | Wholesale & retail | 2018 |
| Fidelio Imran Limited | Wholesale & retail | 2026 |
| Fidelity Records Ltd | Information & communication | 2010 |
| Field Connection Limited | Professional & scientific | 1999 |
| Field Technologies Ltd | Professional & scientific | 2019 |
| Fifi's Place Limited | Wholesale & retail | 2025 |
| Fifth Generation Media Ltd | Professional & scientific | 2022 |
| Fifty Group Limited | Wholesale & retail | 2024 |
| Fifty Seven 7 Services Limited | Administrative & support | 2013 |
| FIG & Olive Holdings Ltd | Financial services | 2020 |
| FIG Gardens Entertainment Ltd | Hospitality | 2019 |
| FIG Tree Creations Ltd | Hospitality | 2024 |
| Figures-And-Facts.Com Limited | Information & communication | 2008 |
| Fiiber Group Ltd | Construction | 2024 |
| Fila Constructions Limited | Construction | 2025 |
| Filcotex Limited | Manufacturing | 2009 |