| F J W Services Limited | Construction | 2005 |
| F R Consultancy Services Limited | Professional & scientific | 2003 |
| F Services 1 UK Ltd | Real estate | 2019 |
| F. Baker (Chimney Sweep) Limited | Administrative & support | 2002 |
| F. G. Smith (Motors) Limited | Extraterritorial | 1997 |
| F. Holgate & Co. Limited | Extraterritorial | 1952 |
| F.A. Firman Limited | | 1990 |
| F.E. Smith Limited | Wholesale & retail | 1981 |
| F.E. Tyrrell & SON Limited | | 1974 |
| F.H.Ives Limited | Manufacturing | 1965 |
| F.P. Guiver & Sons Limited | Other services | 1937 |
| F.T. Medcalf (2000) Limited | Manufacturing | 2000 |
| F.X Hair Studio Ltd | Other services | 2005 |
| FA Capital Ltd | Real estate | 2022 |
| Faabs Consults Limited | Health & social care | 2024 |
| FAB Properties Limited | Real estate | 1997 |
| Fabric Land (Bournemouth) Limited | Wholesale & retail | 1998 |
| Fabric Love Ltd | Wholesale & retail | 2015 |
| Fabz Ltd | Professional & scientific | 2019 |
| Face Services Limited | Real estate | 2000 |
| Fahad Hussayn Ltd | Wholesale & retail | 2025 |
| Faingrove Limited | Professional & scientific | 1994 |
| Fairfax Plumbing (Essex) Limited | Wholesale & retail | 2003 |
| Fairlocks Limited | Manufacturing | 1974 |
| Fairmile Solutions Limited | Information & communication | 1997 |
| Fairview Construction Limited | Extraterritorial | 1989 |
| Fairwhale Time Watch Ltd | Wholesale & retail | 2025 |
| Fairytale Lashes Ltd | Other services | 2021 |
| Faith Believers Chapel Limited | Other services | 2010 |
| Faith Globallinks Ventures Limited | Administrative & support | 2005 |
| Faizain Pro Limited | Health & social care | 2024 |
| Falcon 360 Studio Ltd | Wholesale & retail | 2025 |
| Falcon Car Valeters Ltd | Other services | 2022 |
| Falcon Designs Limited | Construction | 2004 |
| Falcon Supermarket Ltd | Wholesale & retail | 2015 |
| Falhads Fashion Ltd | Wholesale & retail | 2023 |
| Fall Protection Services Ltd | Construction | 2020 |
| Fallen City Ltd | Wholesale & retail | 2024 |
| Famaks Associates Limited | Professional & scientific | 2002 |
| Famtok Limited | Professional & scientific | 2006 |
| Fanclub PR Ltd | Professional & scientific | 2011 |
| Faniel Services Limited | Wholesale & retail | 2024 |
| Fans Homedeco Co., Ltd | Wholesale & retail | 2022 |
| Fantygame Ltd | Manufacturing | 2023 |
| Fanzine Limited | Information & communication | 2013 |
| Faraz M Ltd | Wholesale & retail | 2025 |
| Farehurst Park (Fulbourn) Management Company Limited | Households | 2023 |
| Farhad Hajj & Umrah Ltd | Administrative & support | 2017 |
| Farley Enterprises Limited | | 1990 |
| Farleyway Chemicals Limited | Transport & logistics | 1984 |
| Farnworth Sale Limited | Wholesale & retail | 2025 |
| Farrell Electrical Services Limited | Real estate | 2003 |
| Fashnify.Shop Ltd | Wholesale & retail | 2025 |
| Fast Freight Ltd | Transport & logistics | 2025 |
| Fast-Track Nationwide Recruitment Ltd. | Wholesale & retail | 2001 |
| Fastdrop Ltd | Transport & logistics | 2025 |
| Fastlink Reservations Limited | Administrative & support | 2004 |
| Fastprivate Limited | | 1988 |
| Fastsale Products Limited | Wholesale & retail | 1997 |
| Faten Fayiz Alqadi Limited | Wholesale & retail | 2025 |
| Faud Properties Limited | Real estate | 2000 |
| Faversham Lakes Management Company Limited | Households | 2020 |
| Favorite (Restaurants) Limited | Hospitality | 1996 |
| Favorite Chicken & Ribs / Favorite Fried Chicken | | 1999 |
| Faye Pattison Physiotherapy Limited | Health & social care | 2015 |
| FAZ & FAZ Services Ltd | Health & social care | 2026 |
| Fcll Properties Limited | Real estate | 2024 |
| FDF Trading Ltd | Wholesale & retail | 2026 |
| Fearless Enterprises Limited | Health & social care | 2012 |
| Feather & Gold Ltd | Wholesale & retail | 2025 |
| Feather and Tipping Limited | Professional & scientific | 2001 |
| Fedz Investment & Property Limited | Real estate | 2025 |
| Feeding Stuff and Fertilisers (London) Limited | Wholesale & retail | 1950 |
| Felbrigge Properties Ltd | Real estate | 2006 |
| Felmores Makas Ltd | Other services | 2025 |
| Felow Traders Ltd | Wholesale & retail | 2024 |
| Felsted Cars Ltd | Wholesale & retail | 2014 |
| Felton Building Limited | Construction | 2022 |
| Femisis Limited | Wholesale & retail | 2026 |
| Fenn Properties Limited | Real estate | 2001 |
| Fenstrox Ltd | Construction | 2026 |
| Fenton Flooring Contracts Limited | Construction | 1972 |
| Feora Ltd | Wholesale & retail | 2026 |
| Feran Management Ltd | Information & communication | 2007 |
| Fernsidecapital Ltd | Professional & scientific | 2025 |
| Ferrisward Limited | | 1981 |
| Ferrovia Properties LLP | | 2007 |
| Ferry Motors (Harwich) Limited | Wholesale & retail | 1965 |
| Festina Lente Limited | Construction | 2006 |
| Feuang FOO Ltd | Hospitality | 2017 |
| Feudal Barons Ltd | Arts & recreation | 2026 |
| Ffordes(Photographic)Limited | Other services | 1960 |
| Fiab Health Care Services Ltd | Public administration | 2022 |
| Fibre Free Asbestos Removals Limited | | 1989 |
| Ficosa International Limited | Professional & scientific | 1988 |
| Fieldpass Limited | Wholesale & retail | 1988 |
| Fieldstone Group Services Ltd | Construction | 2026 |
| Fiesta Food Limited | Hospitality | 2024 |
| Figleaf Limited | Wholesale & retail | 2006 |
| Filequick Services Limited | Information & communication | 1995 |