| Firmenich Wellingborough Pension Trustee Limited | Extraterritorial | 2021 |
| Firs (Hounslow) Residents Company Limited(The) | Households | 1971 |
| First Choice Supported Living Limited | Health & social care | 2004 |
| First Investments (UK) Limited | Real estate | 2004 |
| First London Property Management Limited | Real estate | 2002 |
| First United Developments (Flat Management) Limited | Households | 1996 |
| Firtree Consulting Ltd | Information & communication | 1998 |
| Fission Monster Limited | Information & communication | 2024 |
| Fitzroy Limited | Hospitality | 1999 |
| Five Riverdale Gardens (East Twickenham) Limited. | Households | 1984 |
| Fixco Ltd | Construction | 2001 |
| Flannery Capital Ltd | Other services | 2023 |
| Flannery Plant & Haulage Limited | Other services | 2003 |
| Flash Finance Ltd | Financial services | 2001 |
| Flearyd Limited | Manufacturing | 2007 |
| Fleethill Limited | Administrative & support | 1995 |
| Fleming Solutions Limited | Transport & logistics | 2003 |
| Flex Zone Limited | Other services | 2017 |
| Flightcatchers.Com Ltd | Administrative & support | 2000 |
| Floorsanderhire (EU) Limited | Administrative & support | 2007 |
| Flora Fountain Limited | Wholesale & retail | 1977 |
| Floridian Marketing Ltd | Professional & scientific | 2002 |
| Flourishpharm Limited | Wholesale & retail | 2019 |
| Flowers Box London Ltd | Wholesale & retail | 2019 |
| Fluids in Motion Limited | Professional & scientific | 2002 |
| Flux Retouching Limited | Professional & scientific | 2009 |
| FNS Property Limited | Real estate | 2020 |
| Foad FX Ltd | Information & communication | 2025 |
| Focus Investment & Management Limited | Real estate | 2003 |
| Focus Property Creations Ltd | Construction | 2020 |
| Fontmell Limited | Professional & scientific | 1998 |
| Footscope Limited | Health & social care | 2007 |
| FOR the Girlies Limited | Arts & recreation | 2025 |
| Forcedirect Ltd | Information & communication | 2007 |
| Forcola Limited | Professional & scientific | 1996 |
| Fordbridge Estates Limited | Real estate | 2024 |
| Fordon Builders Ltd | Construction | 2013 |
| Forensic Law Limited | Administrative & support | 2003 |
| Forever Filmoholics Ltd | Information & communication | 2023 |
| Fortfield Limited | | 2000 |
| Forum Markets Limited | Other services | 1994 |
| Fountain Penned Productions Limited | Information & communication | 2008 |
| Four Hills Ltd | Education | 2007 |
| Four Walls Property Investments Ltd | Real estate | 2017 |
| Fourth Level Limited | Information & communication | 2003 |
| Foyzul & Sons Ltd | Real estate | 2007 |
| Frame International Limited | Professional & scientific | 1996 |
| Franco International Limited | Wholesale & retail | 1997 |
| Frank Murray Developments Limited | Administrative & support | 2005 |
| Frank Suarez Garage Limited | Wholesale & retail | 2002 |
| Franklin. Roberts | | 1998 |
| Frannock Limited | Professional & scientific | 1979 |
| FRC Holdings Ltd | Real estate | 2004 |
| Freddy's Ltd. | Construction | 2001 |
| Freedom Road Limited | Information & communication | 2020 |
| Freestyle Development Services Ltd | Administrative & support | 2011 |
| Freight Lines (UK) Limited | Real estate | 1994 |
| Fresh Air Consulting Limited | Information & communication | 2006 |
| Fresh Delight UK Limited | Wholesale & retail | 2002 |
| Fresh Horizons Services Ltd | Professional & scientific | 2006 |
| Fri-Jado UK Limited | Other services | 2002 |
| Friendlink Ltd | Information & communication | 1999 |
| Frith Hill House Registrars Limited | Professional & scientific | 2002 |
| Front ROW Services Limited | Construction | 2004 |
| Frontman Solutions Limited | Information & communication | 1999 |
| Frostbyte Limited | Professional & scientific | 2003 |
| Fryman Accounting & Business Services Limited | Professional & scientific | 2007 |
| FS Investments (London) Limited | Real estate | 2017 |
| FSL Aerospace Limited | Wholesale & retail | 1985 |
| FT Proudfoot Ltd | Real estate | 2016 |
| Ftff Limited | Professional & scientific | 2018 |
| Fugitive Colors Ltd | Other services | 2015 |
| Fusion Components Limited | Manufacturing | 2003 |
| Fusion Development Limited | Construction | 2003 |
| Fusion International Holding Company Ltd | Financial services | 2023 |
| Future Development Solutions Limited | Extraterritorial | 1999 |
| Future Homes UK Limited | Real estate | 2000 |
| Future Investments Limited | Financial services | 2001 |
| Future LET (UK) Limited | Real estate | 2003 |
| Future Media Productions Limited | Arts & recreation | 2014 |
| Futurefern Limited | Transport & logistics | 1983 |
| Futurescope Consultants Limited | Construction | 2000 |
| Futuretrend Technologies Limited | Information & communication | 2000 |
| G & B Specialist Builders & Decorators Limited | Construction | 1991 |
| G & B Windows (International) Ltd | Manufacturing | 2000 |
| G 4 Clarity Limited | Information & communication | 2005 |
| G a Management Consultants Limited | Real estate | 1998 |
| G C Fergusson Plumbing & Heating Limited | Construction | 2005 |
| G Cube Ltd | Administrative & support | 2017 |
| G Dale Solutions Limited | Professional & scientific | 2004 |
| G K F Electrical Limited | | 2002 |
| G Krastev Ltd | Construction | 2015 |
| G. ALI & Co. Limited | Professional & scientific | 2003 |
| G.E.A. Associates Limited | Wholesale & retail | 2004 |
| G.G. Architecture Ltd | Professional & scientific | 2025 |
| G.H.A. Reeves & Sons Limited | Construction | 2003 |
| G.J. Lawrence & Co. (Printers) Limited | Wholesale & retail | 1977 |
| G.Kingsbury & SON Limited | Wholesale & retail | 1938 |
| G1 Consulting Limited | Information & communication | 2007 |
| GA Worldwide Limited | Real estate | 2006 |