| Fabulous Trace Ltd | Other services | 2019 |
| Facade 1 Ltd | Construction | 2026 |
| Face'N'Airs Ltd | Wholesale & retail | 2023 |
| FAD Investments Limited | Real estate | 2025 |
| Fades & Blades London Ltd | Other services | 2019 |
| Fades and Blades Romford Ltd | Other services | 2024 |
| Fadez & Bladez Ltd | Other services | 2015 |
| Fadez Ltd | Other services | 2025 |
| Fadix Consulting Ltd | Other services | 2018 |
| FAE Fast Food Limited | Hospitality | 2024 |
| FAE Health Ltd | Health & social care | 2026 |
| FAE Homes Ltd | Real estate | 2025 |
| Faem Property Investments Limited | Real estate | 2024 |
| Fahy Brothers Limited | Construction | 1996 |
| Faiaa Ltd | Hospitality | 2026 |
| Faibin Ltd | Health & social care | 2024 |
| Fair & Field Limited | Professional & scientific | 2017 |
| Fair & Just Ltd | Wholesale & retail | 2025 |
| Fair Helen Ltd | Wholesale & retail | 2025 |
| Fair Window Services Ltd | Construction | 2018 |
| Faircross Finance Limited | Real estate | 1967 |
| Fairdeal Roofing London Limited | Construction | 2025 |
| Fairfax Locksmiths Limited | Other services | 2014 |
| Fairfax Real Estate Investment Management Ltd | Real estate | 2023 |
| Fairlop Motors Ltd | Construction | 2025 |
| Fairmont Property Services Limited | Construction | 2014 |
| FAIRTRADINGUK9 Limited | Wholesale & retail | 2009 |
| FAISA10 Ltd | Wholesale & retail | 2026 |
| Faith and Goody Cleaning Services Ltd | Administrative & support | 2023 |
| Faith Close Management Company Limited | Real estate | 2012 |
| Faith Developments Ltd | Real estate | 2014 |
| Faithcosmeticsco Ltd | Wholesale & retail | 2025 |
| FAJ TM Services Limited | Construction | 2026 |
| FAK4 Limited | Wholesale & retail | 2025 |
| Falcon AD Media Limited | Wholesale & retail | 2012 |
| Falcon Fitness Limited | Health & social care | 2018 |
| Falcon R Ltd | Financial services | 2017 |
| FAM Properties Limited | Real estate | 2016 |
| FAM Tech Ltd | Wholesale & retail | 2018 |
| Family Mortgage Solutions Limited | Financial services | 2021 |
| Family Property Solutions Limited | Real estate | 2024 |
| Family Residential Solutions Limited | Real estate | 2025 |
| Family Tatoo Ltd | Arts & recreation | 2023 |
| Familyg Ltd | Construction | 2023 |
| Familynest Care Services Ltd | Health & social care | 2026 |
| Famous N Dangerous Ltd | Arts & recreation | 2023 |
| Famzon Ltd | Wholesale & retail | 2021 |
| Fanibe J Communication Limited | Information & communication | 2017 |
| Fankidino Ltd | Wholesale & retail | 2024 |
| Fantastic Crepes Ltd | Manufacturing | 2022 |
| Fantastic Finds Limited | Wholesale & retail | 2025 |
| Fanz Properties Limited | Real estate | 2026 |
| FAR Twittering Limited | Hospitality | 2021 |
| Faraja Ltd | Public administration | 2019 |
| Faraway Trade Ltd | Wholesale & retail | 2024 |
| Farddas Company Limited | Administrative & support | 2023 |
| Fareham Green Energy 2 Limited | Construction | 2025 |
| Fareham Green Energy Limited | Construction | 2024 |
| Farhat Injectable Laser & Aesthetic Ltd | Other services | 2026 |
| Faringdon Fast Food Ltd | Hospitality | 2019 |
| Farmers Colony UK Ltd | Manufacturing | 2025 |
| Farmstead Eggs Ltd | Wholesale & retail | 2024 |
| Farmstead Foods Limited | Wholesale & retail | 2025 |
| Farohi Solution Limited | Information & communication | 2018 |
| Farrell Construction Limited | Construction | 2019 |
| Farsanwala Ltd | Wholesale & retail | 2025 |
| Farthing Property Rentals Ltd | Real estate | 2021 |
| Fashbabs Limited | Wholesale & retail | 2019 |
| Fashion Aesthetics Limited | Wholesale & retail | 2026 |
| Fashion and Styling Limited | Wholesale & retail | 2025 |
| Fashion HAS NO Size Limited | Wholesale & retail | 2025 |
| Fashion Three Sixty UK Ltd | Wholesale & retail | 2026 |
| Fashionpak Graphics Limited | Manufacturing | 2013 |
| Fashionquirk Ltd | Manufacturing | 2023 |
| Fashionuks Ltd | Wholesale & retail | 2026 |
| Fashionurbanlondon Ltd | Professional & scientific | 2025 |
| Fasn Properties Ltd | Real estate | 2026 |
| Fast Cure Caring Solutions Limited | Health & social care | 2024 |
| Fast Drylining Ltd | Construction | 2018 |
| Fast Finance Online Limited | Financial services | 2025 |
| Fast Forward Services Ltd | Transport & logistics | 2023 |
| Fast Lane Car Group Ltd | Wholesale & retail | 2023 |
| Fast Lane Styling Europe Limited | Wholesale & retail | 2012 |
| Fast Line Removal Ltd | Transport & logistics | 2024 |
| Fast Logistics London Ltd | Transport & logistics | 2026 |
| Fast Track Couriers Limited | Transport & logistics | 2003 |
| Fast Track Services (FTS) Ltd | Transport & logistics | 2016 |
| Fast&Safety Ltd | Transport & logistics | 2022 |
| Faster Construction Ltd | Construction | 2022 |
| Fastvolts Ltd | Manufacturing | 2025 |
| FAT Electronics Ltd | Hospitality | 2024 |
| Fate Academy Community Connect C.I.C. | Other services | 2023 |
| Fate Academy Ltd | Health & social care | 2015 |
| Fateh Brickworks Ltd | Construction | 2020 |
| Fatman Services Ltd | Information & communication | 2014 |
| Fattah Accountancy Ltd | Professional & scientific | 2013 |
| Fattvapes Ltd | Wholesale & retail | 2017 |
| Fattyfortune Limited | Health & social care | 2013 |
| FAV RG Ltd | Hospitality | 2025 |
| Fawad Solutions Ltd | Information & communication | 2018 |