| Fishponds Trading Ltd | Wholesale & retail | 2022 |
| Fit by Simona Limited | Arts & recreation | 2022 |
| Fit Club Group Ltd | Arts & recreation | 2025 |
| Fit HQ Ltd | Hospitality | 2014 |
| Fit Kitchen Limited | Wholesale & retail | 2015 |
| Fit MUM Transformation Ltd | Arts & recreation | 2020 |
| Fitch Bradley Limited | Administrative & support | 2018 |
| Fitim Investments Ltd | Households | 2014 |
| Fitlife Ltd | Information & communication | 2023 |
| Fitness Factory Leicester Ltd | Arts & recreation | 2015 |
| Fitness Hub Ladies Ltd | Arts & recreation | 2026 |
| Fitness Hub Mens Ltd | Arts & recreation | 2026 |
| Fitness Pro 24 7 Ltd | Arts & recreation | 2015 |
| Fitters Flooring Ltd | Construction | 2025 |
| Fitware Limited | Other services | 2008 |
| Fitzhugh Franchise Ltd | Hospitality | 2025 |
| Fitzhughs Franchise Limited | Hospitality | 2025 |
| Fitzrovia Property Limited | Real estate | 2016 |
| Five Birds Limited | Real estate | 2018 |
| Five Cleans Ltd | Administrative & support | 2025 |
| Five Flags Construction Ltd | Construction | 2025 |
| Five Hundred Ltd | Information & communication | 2025 |
| Five MEN Ltd | Construction | 2019 |
| Five River Investments Ltd | Real estate | 2024 |
| Five Rivers Living Ltd | Health & social care | 2018 |
| Five Rivers Mobile Mechanics Ltd | Wholesale & retail | 2026 |
| Five Seven 57 Ltd | Wholesale & retail | 2026 |
| Five Sides Investments Limited | Real estate | 2004 |
| Five Star Car Wash Limited | Wholesale & retail | 2023 |
| Five Star Center Ltd | Professional & scientific | 2021 |
| Five Star Global Transport Ltd | Transport & logistics | 2026 |
| Five Stars Driveways & Patio Services Leicester Limited | Construction | 2024 |
| Five Torridon Road RTM Company Ltd | Households | 2021 |
| Five Ventures Limited | Real estate | 2016 |
| Five Ways Accounting Limited | Professional & scientific | 2025 |
| FIVE5 Ltd | Construction | 2021 |
| Fivesixphotography Ltd | Professional & scientific | 2024 |
| Fivra Ltd | Administrative & support | 2025 |
| FIX IT Whizz Ltd | Manufacturing | 2024 |
| FIX My Bike Limited | Wholesale & retail | 2010 |
| FIX UP Electrical Ltd | Construction | 2021 |
| FIX Your City Ltd | Information & communication | 2025 |
| Fixnest (Leic) Ltd | Construction | 2023 |
| Fixsure UK Ltd | Other services | 2025 |
| Fixyour Fone Limited | Other services | 2010 |
| Fizhas Ltd | Hospitality | 2011 |
| Fizum Ltd | Professional & scientific | 2022 |
| Fizzauni Limited | Financial services | 2026 |
| Fizzyberries Ltd | Wholesale & retail | 2022 |
| FJ Care Ltd | Health & social care | 2025 |
| FJ Haulage Ltd | Transport & logistics | 2026 |
| FJ Installations Limited | Construction | 2023 |
| FJ IT Limited | Information & communication | 2015 |
| FJ Property Care Ltd | Construction | 2019 |
| FJC Properties Limited | Real estate | 2021 |
| Fjglobal Properties Limited | Real estate | 2026 |
| Fjjj Enterprise Ltd | Real estate | 2022 |
| FJN Properties Ltd | Real estate | 2021 |
| FJS Engineering Services Limited | Professional & scientific | 2012 |
| FJS Transport Consultancy Ltd | Transport & logistics | 2025 |
| FK Electrical Installations Limited | Construction | 2014 |
| FLA Commercial Services Limited | Construction | 2023 |
| Flaag International Limited | Administrative & support | 2000 |
| Flair Finance Limited | Financial services | 2009 |
| Flair Press Limited | Manufacturing | 1983 |
| Flairnow Limited | Construction | 1988 |
| Flame Heating & Boilers Ltd | Construction | 2021 |
| Flame Ingo Grill Ltd | Hospitality | 2018 |
| Flame Lilly Ltd | Hospitality | 2024 |
| Flamingo Bar Ltd | Hospitality | 2018 |
| Flamingo Investments Limited | Administrative & support | 2019 |
| Flamingo Social Solutions Ltd | Health & social care | 2016 |
| Flamme Rouge Cycling Ltd | Education | 2026 |
| Flappers & Gentlemen Limited | Other services | 2013 |
| Flash Scaffolding Ltd | Construction | 2025 |
| Flashing Cards Ltd | Wholesale & retail | 2026 |
| Flattered Paws Ltd | Wholesale & retail | 2026 |
| Flava N Spice Limited | Hospitality | 2025 |
| Flavell Pubs Ltd | Hospitality | 2019 |
| Flavourr Granito Ltd. | Wholesale & retail | 2019 |
| Flavours of Asia Ltd | Hospitality | 2012 |
| Flavourss Ltd | Hospitality | 2025 |
| Flavvorra Ltd | Hospitality | 2022 |
| Flawless Capital Ltd | Financial services | 2021 |
| Flawless Care PVT Limited | Administrative & support | 2017 |
| Flawless CBD Limited | Wholesale & retail | 2018 |
| Flawless Diamond Associates LLP | | 2016 |
| Flawless Smart Paint Solutions Ltd | Wholesale & retail | 2025 |
| Flawless UK Investments Ltd | Real estate | 2021 |
| Flawless UK Vape Distribution Ltd | Wholesale & retail | 2016 |
| Flawless Vape Holdings Limited | Financial services | 2025 |
| Flawless Vape Labs Ltd | Manufacturing | 2016 |
| Flawless Vape Shop Ltd | Wholesale & retail | 2016 |
| Flaxholme Professional Ltd | Transport & logistics | 2014 |
| Flaxy Express Trading Ltd | Wholesale & retail | 2015 |
| Fleckney Autofix Limited | Wholesale & retail | 2015 |
| Fleckney Express Ltd | Wholesale & retail | 2023 |
| Fleckney Trading Ltd | Wholesale & retail | 2026 |
| Fleece Knit Ltd | Manufacturing | 2001 |
| Fleet and Logistics Ltd | Transport & logistics | 2019 |