| Federal Distribution Limited | Transport & logistics | 2019 |
| Federation of Zionist Youth UK | Arts & recreation | 2012 |
| Fedi&Co Limited | Professional & scientific | 2018 |
| Feed Your Head Ltd | Other services | 2022 |
| Feelgood-Sale Ltd | Wholesale & retail | 2016 |
| FEF Consulting Ltd | Administrative & support | 2021 |
| Fei&Lin Ltd | Information & communication | 2026 |
| Felicity Boutique Limited | Wholesale & retail | 2014 |
| Feliz Marketing Limited | Professional & scientific | 2007 |
| Fello Studio Ltd | Professional & scientific | 2018 |
| Felside Court Freehold Company Limited | Real estate | 2021 |
| Femhale Limited | Health & social care | 2023 |
| Femina Wholesale Hub Ltd | Wholesale & retail | 2025 |
| FEN Dent Ltd | Health & social care | 2026 |
| Fenix Property Services Limited | Real estate | 2017 |
| Fenmare Management Company Limited | Households | 1994 |
| Fens Group Limited | Financial services | 2022 |
| Fenton GEE Entertainment Ltd | Arts & recreation | 2023 |
| Fentonbridge Limited | Real estate | 1980 |
| Feock Tree Ltd | Financial services | 2023 |
| Ferment House Ltd | Hospitality | 2026 |
| Fermi Labs Research Ltd | Professional & scientific | 2019 |
| Fern Vale Investments Ltd | Real estate | 2026 |
| Fernando Healthcare Ltd | Health & social care | 2024 |
| Ferndown Motor Services Limited | Wholesale & retail | 2011 |
| Ferva Music Ltd | Information & communication | 2023 |
| Fery Services Ltd | Construction | 2025 |
| Feta Ltd T/A Ping Business Solutions Ltd | Information & communication | 2014 |
| Fetch Technology Group Ltd | Information & communication | 2017 |
| Fewings Property Investments Ltd | Real estate | 2025 |
| Fexim Staffing Solutions Ltd | Administrative & support | 2023 |
| Feynlabs Limited | Information & communication | 2013 |
| Feyth Consultancy Ltd | Professional & scientific | 2025 |
| FF Foundation Limited | Information & communication | 2018 |
| FFN Trade Ltd | Wholesale & retail | 2025 |
| FFS London Ltd | Professional & scientific | 2026 |
| Ffusa Construction Limited | Construction | 2020 |
| Ffynnu Ltd | Real estate | 2021 |
| FG Healthcare Consultancy Ltd | Administrative & support | 2015 |
| FGH Solutions Limited | Professional & scientific | 2007 |
| FH Accountancy Consultants Limited | Professional & scientific | 2015 |
| FH Locums Ltd | Health & social care | 2012 |
| Fhegday’S Dukaan Limited | Wholesale & retail | 2020 |
| FHM Cranford Limited | Real estate | 2026 |
| FIB Construct Ltd | Construction | 2023 |
| FIB UK Hospitalty Software Solutions Ltd | Information & communication | 2024 |
| Fidelity Fintech Limited | Professional & scientific | 2021 |
| Field and Castle Limited | Extraterritorial | 2014 |
| Field Designs London Limited | Professional & scientific | 1998 |
| Field's Care Ltd | Other services | 2013 |
| Fieldbrook Limited | Construction | 2001 |
| Fieldworks London Limited | Administrative & support | 2012 |
| Fierce & Flower Limited | Information & communication | 2018 |
| FIF Plumbing and Heating Limited | Construction | 2023 |
| Fife Lodgings Ltd | Hospitality | 2021 |
| Fifth Dimension Property Holdings Ltd | Real estate | 2013 |
| Fifty Eight Capital Ltd | Financial services | 2023 |
| Fiftyfive Group Ltd. | Information & communication | 2017 |
| Fighting 2 Fitness Ltd | Arts & recreation | 2024 |
| Figure Box Studio Ltd | Information & communication | 2022 |
| Figure Eleven Systems Ltd | Administrative & support | 2023 |
| Fikiri Limited | Professional & scientific | 2016 |
| Fikiria Ltd | Professional & scientific | 2022 |
| Filabl Ltd | Information & communication | 2026 |
| Fili Brickwork Ltd | Manufacturing | 2022 |
| Fill Group Ltd | Construction | 2021 |
| Filmkowski Ltd | Information & communication | 2017 |
| Filmon TV Limited | Information & communication | 2007 |
| Filmon.Tv UK Limited | Arts & recreation | 2008 |
| Filmscope CIC | Information & communication | 2021 |
| Filo.London Ltd | Wholesale & retail | 2026 |
| Filthy Fellas Limited | Information & communication | 2024 |
| Filzora Ltd | Manufacturing | 2026 |
| FIN Expert Consulting Ltd | Professional & scientific | 2022 |
| Finacc Ltd | Professional & scientific | 2012 |
| Final Touch Automotive Ltd | Transport & logistics | 2021 |
| Finance House Limited | Financial services | 1989 |
| Finance Plus LLP | | 2013 |
| Financial Goal Attainment Limited | Financial services | 2014 |
| Financial Gyan Ltd | Professional & scientific | 2019 |
| Financial Syndicate Accountants Limited | Professional & scientific | 2013 |
| Financial Systems Integration Ltd. | Information & communication | 2016 |
| Financial Visibility Limited | Professional & scientific | 2005 |
| Financial World Ltd | Financial services | 2017 |
| Financiere International Strategy and Advisory Ltd | Administrative & support | 2018 |
| Finark AI Ltd | Information & communication | 2026 |
| Finarts Limited | Manufacturing | 2024 |
| Finax Partners Ltd | Professional & scientific | 2026 |
| Finbar Investments (International) Limited | Hospitality | 2008 |
| Finbond Limited | Real estate | 1992 |
| Finbury Ltd | Real estate | 2020 |
| Finceptive Ltd | Professional & scientific | 2023 |
| Finch & Sterling Estates Ltd | Professional & scientific | 2025 |
| Finchley Local Store Ltd | Wholesale & retail | 2019 |
| Find My Space Limited | Households | 2021 |
| Find My Vendor Ltd | Information & communication | 2024 |
| Finda's Housing Ltd | Real estate | 2024 |
| Findlater House Limited | Real estate | 2013 |
| Fine & Shine Ltd | Administrative & support | 2023 |
| Fine Art Distribution Company Limited | Manufacturing | 1972 |