| Farrell Management Ltd. | Construction | 2019 |
| Farringdon & Forbes Ltd | Wholesale & retail | 2015 |
| Farrington Group Ltd | Manufacturing | 2020 |
| Farrouj Ltd | Hospitality | 2025 |
| Farseek Ltd | Professional & scientific | 2025 |
| Farthing Jones Construction Ltd | Construction | 2024 |
| Farukh Tahir Ltd | Wholesale & retail | 2022 |
| Fascinating Gourmet Limited | Wholesale & retail | 2007 |
| Fasgi Solutions Ltd | Administrative & support | 2020 |
| Fashamun Development Ltd | Real estate | 2024 |
| Fashion Agent Limited | Wholesale & retail | 2002 |
| Fashion Broker Ltd | Wholesale & retail | 2024 |
| Fashion DR France Ltd | Wholesale & retail | 2025 |
| Fashion Events & Productions Ltd | Administrative & support | 2018 |
| Fashion Forward 2025 Ltd | Wholesale & retail | 2026 |
| Fashion Glam Essence Ltd | Wholesale & retail | 2025 |
| Fashion Golden Ecom Ltd | Wholesale & retail | 2025 |
| Fashion Home Textile Co., Ltd | Extraterritorial | 2020 |
| Fashion Mania Limited | Wholesale & retail | 2023 |
| Fashion NOR Ltd | Other services | 2025 |
| Fashion on Stock Ltd | Other services | 2016 |
| Fashion Trends Hair Ltd | Other services | 2025 |
| Fashioned for Worship Ltd | Wholesale & retail | 2020 |
| Fashionkurko Limited | Wholesale & retail | 2025 |
| Fashiony Trade Ltd | Wholesale & retail | 2025 |
| Fashionyourday Ltd | Other services | 2025 |
| Fashmire Limited | Wholesale & retail | 2025 |
| Fashtronix Hub Ltd | Wholesale & retail | 2024 |
| Fasnacht & Partner AG Ltd | Education | 2025 |
| Fasnelo Solutions Ltd | Administrative & support | 2021 |
| Fast & Efficient Finance Limited | Financial services | 2003 |
| Fast Audit Artificial Intelligence Limited | Administrative & support | 2024 |
| Fast Blood Test Ltd | Health & social care | 2023 |
| Fast Fashion MCR Ltd | Wholesale & retail | 2019 |
| Fast Findz Ltd | Wholesale & retail | 2026 |
| Fast Fire & Security Technologies Ltd | Professional & scientific | 2020 |
| Fast FIX Team Ltd | Information & communication | 2015 |
| Fast Food Centre Ltd | Hospitality | 2025 |
| Fast Food Europe Ltd | Hospitality | 2016 |
| Fast Food Services Limited | Hospitality | 2021 |
| Fast Lane Rectification Ltd | Construction | 2018 |
| Fast Lane Transport Ltd | Transport & logistics | 2019 |
| Fast LIN Construction Ltd | Construction | 2019 |
| Fast N' Loud Limited | Professional & scientific | 2013 |
| Fast Pace Couriers Ltd | Transport & logistics | 2020 |
| Fast Paye Services Ltd | Administrative & support | 2023 |
| Fast Service 4U Ltd | Other services | 2018 |
| Fast Service Cardiff Limited | Hospitality | 2018 |
| Fast Technology (London) Ltd | Information & communication | 1993 |
| Fast Track Law Limited | Professional & scientific | 2025 |
| Fast&Reliable Repairs Limited | Wholesale & retail | 2025 |
| Fast-Trak Utilities & Construction Services Ltd | Construction | 2012 |
| Faster and Faster Limited | Wholesale & retail | 2020 |
| Faster Therapy Ltd | Health & social care | 2023 |
| Fastjet Aviation Ltd | Transport & logistics | 2024 |
| Fastnet Property Holdings 2 Limited | Real estate | 2024 |
| Fastnet Property Holdings Limited | Financial services | 2024 |
| Fastnet Property Investments 2 Ltd | Real estate | 2022 |
| Fastnet Property Investments Limited | Construction | 2006 |
| Fastpay Umbrella Ltd | Administrative & support | 2019 |
| Fastplumbuk Limited | Construction | 2024 |
| Fastrax Cargo Limited | Transport & logistics | 2011 |
| Fastscale Consulting Ltd | Professional & scientific | 2025 |
| Fastsphere Property Management Limited | Households | 1991 |
| Fasttrek LLP | | 2023 |
| FAT Cherries Limited | Information & communication | 2019 |
| FAT Satsuma Limited | Information & communication | 2014 |
| Fate of Samm Limited | Professional & scientific | 2019 |
| Fathi Barbers Limited | Other services | 2021 |
| Fathom & Forge Ltd | Arts & recreation | 2017 |
| Fathom Consultancy Ltd | Information & communication | 2025 |
| Fatih Yachting Ltd | Administrative & support | 2024 |
| Fatoumata Prestige Ltd | Other services | 2025 |
| Fatra U.K. Limited | Construction | 1997 |
| Fattoush Express Ltd | Hospitality | 2019 |
| Fatty Mart Ltd | Wholesale & retail | 2025 |
| Faulkner and Madden Limited | Real estate | 2012 |
| Faultless Fitness Ltd | Arts & recreation | 2012 |
| Faustina James (London) Ltd | Administrative & support | 2021 |
| Favafield Solutions Ltd | Wholesale & retail | 2026 |
| Favela Entertainment Limited | Information & communication | 2025 |
| Favmarv UK Ltd | Real estate | 2026 |
| Favourite Estates Ltd | Real estate | 2009 |
| Fawlty Taverns Ltd | Extraterritorial | 2023 |
| Fawrgarthco Limited | Financial services | 2022 |
| Faxons Estates Limited | Real estate | 2017 |
| Faye Hannah Consulting Ltd | Professional & scientific | 2015 |
| Faye Medya Ltd | Information & communication | 2025 |
| Faysal Global Ltd | Wholesale & retail | 2025 |
| Fayza Limited | Wholesale & retail | 2017 |
| FAZ Catering Limited | Hospitality | 2026 |
| FAZ Fit Ltd | Wholesale & retail | 2025 |
| Fazal Brother's Limited | Wholesale & retail | 2015 |
| Fazamnesty Limited | Professional & scientific | 2019 |
| Faze Digital Limited | Professional & scientific | 2019 |
| Faze PAY Limited | Financial services | 2020 |
| Fazilet Limited | Administrative & support | 2014 |
| Fazons Consultants Ltd | Real estate | 2018 |
| Façades Lifestyle Limited | Information & communication | 2025 |
| FB Central Buying Ltd | Professional & scientific | 2017 |