| Faithfulness Limited | Health & social care | 2020 |
| Faizy Fast Foods Ltd | Hospitality | 2025 |
| Falcon Development Holdings Ltd | Real estate | 2018 |
| Falcon Flooring (Towcester) Limited | Construction | 2005 |
| Falcon International Bags Limited | Wholesale & retail | 1994 |
| Falcon International Holdings Limited | Real estate | 2019 |
| Falcon International Industrial Supplies Limited | Wholesale & retail | 2022 |
| Falcon Investment Ltd | Construction | 2009 |
| Falcon SC Limited | Professional & scientific | 2021 |
| Falcon Transportation Ltd | Transport & logistics | 2015 |
| Falcon Treasure Limited | Wholesale & retail | 2025 |
| Fallows X Ltd | Transport & logistics | 2026 |
| Falstreak Ltd | Financial services | 2021 |
| Famera Ltd | Wholesale & retail | 2023 |
| Fameshyne Ltd | Hospitality | 2025 |
| Family Bizniss Limited | Information & communication | 2026 |
| Family Doctor Publications Limited | Information & communication | 1991 |
| Family First Photography Limited | Professional & scientific | 2016 |
| Family Living Spaces Ltd | Construction | 2023 |
| Fammes Limited | Health & social care | 2019 |
| Famrohwo Limited | Health & social care | 2022 |
| Fanel Transport Limited | Transport & logistics | 2012 |
| Fantomas Extreme Embroidery Ltd | Manufacturing | 2021 |
| Faola Pharm Ltd | Wholesale & retail | 2024 |
| FAR Cotton Amateur Boxing Club | Arts & recreation | 2016 |
| FAR Cotton Business Centre Management Limited | Real estate | 2007 |
| FAR Cotton Ltd | Health & social care | 2025 |
| FAR Cotton Takeaway Ltd | Hospitality | 2022 |
| FAREE7STAR Ltd | Wholesale & retail | 2021 |
| Fareen Ltd | Information & communication | 2022 |
| Farhana Limited | Financial services | 2018 |
| Farj Services Ltd | Health & social care | 2015 |
| Farmers Bloodhounds Ltd | Agriculture & fishing | 2021 |
| Farmlease Limited | Extraterritorial | 2016 |
| Farrar 1977 Holdings Ltd | Real estate | 2024 |
| Farrow Estates Limited | Real estate | 2018 |
| Farsh Limited | Wholesale & retail | 2025 |
| Fascia Future Limited | Construction | 2003 |
| Fast & Reliable Ltd | Transport & logistics | 2019 |
| Fast and Forward Limited | Transport & logistics | 2015 |
| Fast Arrow Ltd | Transport & logistics | 2026 |
| Fast CUT Construction Ltd | Construction | 2019 |
| Fast Ecology Ltd | Professional & scientific | 2026 |
| Fast Finish Limited | Manufacturing | 2002 |
| Fast for Less Ltd | Transport & logistics | 2017 |
| Fast Logistics Cargo Transport Limited | Transport & logistics | 2022 |
| Fast Sales System Ltd | Information & communication | 2024 |
| Fast Start Driving School Ltd | Education | 2024 |
| Fast Theory Test Ltd | Transport & logistics | 2025 |
| Fast Track Cars Ltd | Wholesale & retail | 2026 |
| Fast Track Logistics UK Limited | Transport & logistics | 2016 |
| Fast Travellers Limited | Administrative & support | 2025 |
| Fast-Tech Supplies Limited | Wholesale & retail | 2004 |
| Fasthomecourier Ltd | Transport & logistics | 2025 |
| Faststar Limited | Administrative & support | 1983 |
| FAT Chillies Ltd | Wholesale & retail | 2024 |
| FAT FAT Limited | Hospitality | 2018 |
| FAT Fugu Limited | Other services | 2018 |
| FAT Pheasant Ltd | Hospitality | 2024 |
| FAT Trailers Ltd | Wholesale & retail | 2025 |
| FAT Trees (Newport Pagnell) Limited | Real estate | 2003 |
| Fatbread Creatives Ltd | Arts & recreation | 2025 |
| Fatcroc Social Media Limited | Administrative & support | 2015 |
| Fateh & Sons Ltd | Wholesale & retail | 2025 |
| Fatih Altun Barbers Ltd | Other services | 2023 |
| Fatisha Limited | Health & social care | 2009 |
| Fault Finder Limited | Information & communication | 2012 |
| Fave Construction Ltd | Construction | 2023 |
| Favell Contracts Ltd | Administrative & support | 2009 |
| Favorit Vans Ltd | Transport & logistics | 2023 |
| Favour Health Ltd | Health & social care | 2014 |
| Favours Day Nursery Limited | Health & social care | 2009 |
| Fawkes PUB Co Ltd | Hospitality | 2025 |
| Fawsley Walled Garden Limited | Extraterritorial | 2015 |
| Fawz & Partners Ltd | Wholesale & retail | 2025 |
| Faxton Land & Property Ltd | Professional & scientific | 2023 |
| Faxton Services Limited | Professional & scientific | 2020 |
| Fayaz Enterprise Ltd | Wholesale & retail | 2025 |
| Faye Louise Hair Ltd | Other services | 2025 |
| Faymonville UK Limited | Manufacturing | 2001 |
| Fazal Direct Ltd | Wholesale & retail | 2026 |
| FB Business Solutions Ltd | Financial services | 2009 |
| FB Drives International Limited | Wholesale & retail | 2024 |
| FB Facility Management Ltd Ltd | Administrative & support | 2025 |
| FBF Shop Ltd | Wholesale & retail | 2020 |
| FBI (Holdings) Ltd | Financial services | 2025 |
| FBN Food Limited | Wholesale & retail | 2026 |
| FC Transport Ltd | Transport & logistics | 2024 |
| FCL Health Solutions Ltd | Other services | 2013 |
| FCL Holdco Ltd | Professional & scientific | 2022 |
| FCM (Shenley) Ltd | Construction | 2022 |
| FCM Building Ltd | Construction | 2018 |
| FCM Building Services Ltd | Construction | 2023 |
| FCM Holdings Limited | Construction | 2004 |
| FDP Groundworks Ltd | Construction | 2016 |
| FDR Services UK Ltd | Administrative & support | 2017 |
| FDR Social Care Ltd | Health & social care | 2019 |
| Fdxtra Ltd | Professional & scientific | 2010 |
| Feather Edge Northampton Limited | Manufacturing | 2025 |
| Feather Robins Ltd | Wholesale & retail | 2022 |