| Fosse Riders Limited | Professional & scientific | 2019 |
| Fosse Road Market Ltd | Wholesale & retail | 2025 |
| Fosse Solar Limited | Construction | 2025 |
| Fosse Sun Rooms Limited | Other services | 2017 |
| Fosse Tailors Ltd | Wholesale & retail | 2023 |
| Fosse Thermal and Sheet Metal Ltd | Energy | 2014 |
| Fosse Trading Ltd | Real estate | 2023 |
| FOSSELE3 Ltd | Hospitality | 2022 |
| Fosseway Freight Ltd | Transport & logistics | 2010 |
| Fosseway Parcels Limited | Transport & logistics | 2013 |
| Fossinger Limited | Financial services | 2016 |
| Fothergill Wyatt Limited | Real estate | 2010 |
| Fotm Ltd | Wholesale & retail | 2026 |
| Fotosleek Limited | Information & communication | 2025 |
| Found Limited | Administrative & support | 2010 |
| Found Recruitment Limited | Administrative & support | 2010 |
| Foundation for Community Dance | Arts & recreation | 1989 |
| Four Creative Ltd | Financial services | 2023 |
| Four Eyes ARE Better Than Two Ltd | Health & social care | 2012 |
| Four Industry Ltd | Other services | 2020 |
| Four M Drywall (South East) Limited | Construction | 2023 |
| Four Oaks (Leicester) Limited | Professional & scientific | 1973 |
| Four Seasons Building and Maintenance Ltd | Construction | 2024 |
| Four Seasons Chinese Takeaway Limited | Hospitality | 2020 |
| Four Seasons Country Park Ltd | Hospitality | 2022 |
| Four Ways Blyth Ltd | Hospitality | 2024 |
| Four Ways Hotel Ltd | Hospitality | 2020 |
| FOUR&8 Consultancy Limited | Information & communication | 2023 |
| Fourmdrywall Limited | Construction | 2013 |
| Fourteen Stars Limited | Real estate | 2019 |
| Fourten Investment Limited | Financial services | 2020 |
| Fourten Property Development Limited | Construction | 2020 |
| Fourth Property Ltd | Real estate | 2020 |
| Fourwards at Ashfields Ltd | Financial services | 2018 |
| Fourways Leicester Ltd | Wholesale & retail | 2012 |
| Fouta Quality Care Ltd | Health & social care | 2017 |
| Fowkes Street Management Ltd | Households | 2018 |
| Fowler Invest Co Limited | Real estate | 2024 |
| FOX & Co Studio Limited | Manufacturing | 2014 |
| FOX & Key Ltd | Real estate | 2025 |
| FOX and Hounds Exton Limited | Hospitality | 2024 |
| FOX Barbers 2 Limited | Other services | 2024 |
| FOX Barbers Blaby Ltd | Other services | 2025 |
| FOX Barbers Ltd | Other services | 2024 |
| FOX BARBERS3 Ltd | Other services | 2023 |
| FOX Boiler Care Ltd | Construction | 2017 |
| FOX Books Leicester Ltd | Wholesale & retail | 2021 |
| FOX County Ltd | Wholesale & retail | 2023 |
| FOX EYE Publishing Limited | Wholesale & retail | 2021 |
| FOX Fabrication Services Ltd | Manufacturing | 2021 |
| FOX Florin Limited | Transport & logistics | 2015 |
| FOX GAS Ltd | Construction | 2025 |
| FOX Heritage (Admin) Limited | Administrative & support | 2024 |
| FOX Heritage Financial Services Limited | Financial services | 2020 |
| FOX IT Service Management Limited | Professional & scientific | 2024 |
| FOX LAB UK Limited | Wholesale & retail | 2018 |
| FOX Market Ltd | Wholesale & retail | 2026 |
| FOX Midlands (Leicester) Limited | Construction | 2004 |
| FOX Neurodevelopmental Limited | Health & social care | 2023 |
| FOX Prime Couriers Limited | Transport & logistics | 2020 |
| FOX Prime Services Ltd | Wholesale & retail | 2020 |
| FOX Property Refurbishments Limited | Real estate | 2021 |
| FOX River Estates Ltd | Real estate | 2025 |
| FOX Soccer Academy Ltd | Education | 2016 |
| FOX Traders Ltd | Wholesale & retail | 2025 |
| Fox's Furrow Ltd | Hospitality | 2023 |
| Fox-Hut Ltd | Hospitality | 2021 |
| Foxes 1650 Limited | Information & communication | 2016 |
| Foxes Care Home for Young People Ltd | Health & social care | 2024 |
| Foxes Property Limited | Real estate | 2019 |
| Foxes Recruitment Limited | Administrative & support | 2019 |
| Foxglove Energy Supply Ltd | Energy | 2015 |
| Foxglove Energy Trading Limited | Extraterritorial | 2014 |
| Foxglove Leicester Ltd | Transport & logistics | 2007 |
| Foxglove Property Development Ltd | Administrative & support | 2025 |
| Foxgreen Limited | Real estate | 2025 |
| Foxhut Garden Ltd | Hospitality | 2024 |
| Foxian Ltd | Wholesale & retail | 2021 |
| Foxion Limited | Manufacturing | 2024 |
| Foxon Thermal Limited | Construction | 2013 |
| Foxton Care and Education Ltd | Professional & scientific | 2023 |
| Foxton Locks Inn Limited | Hospitality | 2005 |
| Foxy Promotions Ltd | Wholesale & retail | 2025 |
| FOY Holdings Ltd | Real estate | 2020 |
| FOZ Medical Ltd | Health & social care | 2023 |
| Fozar Ltd | Wholesale & retail | 2024 |
| FP INT Business Services Limited | Professional & scientific | 2014 |
| Fp&A Partners Ltd | Professional & scientific | 2018 |
| FPC Capital Ltd | Real estate | 2023 |
| FPL Analytica Ltd | Information & communication | 2026 |
| FPS Corporate Services Ltd | Administrative & support | 2018 |
| Fpsa Limited | Administrative & support | 2024 |
| FPSD1 Limited | Professional & scientific | 2024 |
| FPSD2 Limited | Professional & scientific | 2024 |
| FQI Ltd | Education | 2023 |
| Frabia Ltd | Information & communication | 2021 |
| Fractal Telecom Services Limited | Information & communication | 2003 |
| Fractional Administration Services Limited | Professional & scientific | 2006 |
| Fractional Administration Solutions Limited | Professional & scientific | 2006 |
| Fractional Nominees Limited | Professional & scientific | 2006 |