| Fiza Tariq Ltd | Wholesale & retail | 2026 |
| Fizakrafts Limited | Extraterritorial | 2021 |
| Fizza Electronics Limited | Wholesale & retail | 1986 |
| Fizza Jafri Ltd | Information & communication | 2026 |
| Fizza Pharma Ltd | Health & social care | 2015 |
| Fizzing Minds Ltd | Education | 2025 |
| Fizziostuff (UK) Limited | Health & social care | 1995 |
| Fizzypopuk Ltd | Wholesale & retail | 2021 |
| FJ Freight Ltd | Transport & logistics | 2025 |
| FJ Oasis African Market Ltd | Wholesale & retail | 2025 |
| FJ Project Solutions Limited | Professional & scientific | 2017 |
| FJ Residential (430 Fulham Palace Road) Limited | Real estate | 2020 |
| FJA Health Retail Limited | Wholesale & retail | 2022 |
| FJA Limited | Health & social care | 2019 |
| FJA Properties Limited | Real estate | 2020 |
| FJD Consulting Ltd | Information & communication | 2024 |
| FJD Tyres Limited | Administrative & support | 2007 |
| Fjinpns Ltd | Wholesale & retail | 2025 |
| FJK Car Leasing Ltd | Administrative & support | 2025 |
| Fjordan Lulu Ltd | Real estate | 2022 |
| Fjordbuxus Ltd | Transport & logistics | 2019 |
| FJP Ltd | Information & communication | 2019 |
| Fjrb Properties Ltd | Real estate | 2026 |
| FJT Solutions Limited | Construction | 2024 |
| FK Bargain Store Limited | Wholesale & retail | 2017 |
| FK Construction Limited | Construction | 2015 |
| FK Facades Limited | Construction | 1993 |
| FK Global Limited | Wholesale & retail | 2016 |
| FK Group Limited | Financial services | 2011 |
| FK Official UK Ltd | Information & communication | 2015 |
| FK Prime Kebab Ltd | Hospitality | 2026 |
| Fkhd Limited | Transport & logistics | 2026 |
| FKL Trading Ltd | Wholesale & retail | 2020 |
| Fkmfp Ltd | Wholesale & retail | 2023 |
| FKT Joinery and Construction Limited | Manufacturing | 2025 |
| FL Commercial Limited | Information & communication | 2019 |
| FL Fire Ltd | Construction | 2024 |
| Fl-Ght Labs Ltd | Professional & scientific | 2024 |
| Flaelepia Ltd | Transport & logistics | 2019 |
| Flag-Me Safe Limited | Health & social care | 2026 |
| Flaggit Ltd | Administrative & support | 2026 |
| Flagship Fitness Ltd | Administrative & support | 2026 |
| Flagship Living Ltd | Real estate | 2024 |
| Flagship Marketing Limited | Professional & scientific | 2025 |
| Flagstaff Dental Clinic Limited | Health & social care | 2010 |
| Flagvalue Limited | | 1988 |
| Flaherty Limited | Construction | 2014 |
| Flair Associates Ltd | Real estate | 2020 |
| Flair Global Trading Ltd | Wholesale & retail | 2024 |
| Flair Hairdressers Ltd | Other services | 2012 |
| Flair Interntional Ltd | Wholesale & retail | 2025 |
| Flair&Finesse Ltd | Wholesale & retail | 2024 |
| Flairfax Limited | Real estate | 1983 |
| Flairfinancials Ltd | Professional & scientific | 2024 |
| Flairmedicalaesthetics Limited | Other services | 2018 |
| Flaiva Ltd | Hospitality | 2017 |
| Flakeymcr Ltd | Hospitality | 2025 |
| Flam Fried Take Away Ltd | Hospitality | 2023 |
| Flamboyant Potato Ltd | Information & communication | 2026 |
| Flame and Comfort Limited | Wholesale & retail | 2026 |
| Flame and Thunder Two Ltd | Extraterritorial | 2025 |
| Flame Cluck Ltd | Hospitality | 2026 |
| Flame Control Ltd | Public administration | 2016 |
| Flame HUT Ltd | Hospitality | 2025 |
| Flame IQ Ltd | Construction | 2025 |
| Flame Rise Capital Partners Ltd | Extraterritorial | 2026 |
| Flamed Pizzas Ltd | Hospitality | 2019 |
| Flames Heritage Limited | Professional & scientific | 2022 |
| Flames Smoke House Ltd | Hospitality | 2015 |
| Flametec GAS Services Ltd | Construction | 2023 |
| Flamia and Jabz UK Ltd | Wholesale & retail | 2025 |
| Flamin BBQ Ltd | Hospitality | 2005 |
| Flaming Cat Ltd | Professional & scientific | 2014 |
| Flaming Grill Foods Ltd | Hospitality | 2023 |
| Flamingo Haircare Ltd | Wholesale & retail | 2025 |
| Flamingo Shot Ltd | Extraterritorial | 2023 |
| Flanrail Ltd | Construction | 2020 |
| Flanxus Energies Limited | Professional & scientific | 2021 |
| Flare 4 Media Ltd | Professional & scientific | 2015 |
| Flare Sales Ltd | Professional & scientific | 2019 |
| Flarefix Ltd | Construction | 2026 |
| Flash Barz Ltd | Hospitality | 2019 |
| Flash Clinic Limited | Manufacturing | 2024 |
| Flash Pizza Ltd | Hospitality | 2026 |
| Flash Sales UK Limited | Wholesale & retail | 2022 |
| Flash V-One Limited | Administrative & support | 2011 |
| Flashfield Properties Limited | Real estate | 2017 |
| Flashheart Digital Ltd. | Professional & scientific | 2013 |
| Flashing Goods Ltd | Wholesale & retail | 2025 |
| Flashmart Ltd | Wholesale & retail | 2025 |
| Flashpoint Solutions Limited | Administrative & support | 2021 |
| Flaskbuzz Limited | Real estate | 2006 |
| Flat OUT Lettings Ltd | Real estate | 2025 |
| Flat Rate Movers Limited | Transport & logistics | 2022 |
| Flat Roofing Manchester Ltd | Construction | 2023 |
| Flatcare Ltd | Real estate | 2000 |
| Flatcoder Limited | Information & communication | 2010 |
| Flaterz Ltd | Professional & scientific | 2025 |
| Flatstock Ltd | Real estate | 2016 |
| Flavor Kitchen Takeaway Ltd | Hospitality | 2021 |