| F&G Commercials (Manchester) Limited | Loudwater, High Wycombe | 2014 |
| F&N Worldwide Movers Limited | Grantham | 1994 |
| F&R Commercials Ltd | Norwich | 2024 |
| F&Sajfoods Ltd | London | 2020 |
| F'Almo Ltd | Epping | 2021 |
| F-Beat Music Limited | Clacton-On-Sea | 1979 |
| F-Big Limited | London | 2019 |
| F-Cal Support Services Limited | Bicester | 2015 |
| F-S Capital 1663097 Ltd | London | 2023 |
| F. G. Smith (Motors) Limited | Essex | 1997 |
| F. Harrison & SON (Funeral Directors) Limited | Sutton Coldfield | 1960 |
| F. Holgate & Co. Limited | Essex | 1952 |
| F. J. (Downton) Limited | Fulham | 1931 |
| F. Jennings & Sons Limited | Sutton Coldfield | 2012 |
| F. Kneeshaw & Sons (Funeral Directors) Limited | Sutton Coldfield | 1995 |
| F. Newsome & SON Limited | Gateshead | 1991 |
| F. Peart & Co. Ltd | Birchwood | 1925 |
| F. R. Bartlett Limited | Yeovil | 1958 |
| F. Richardson (Cabinet Makers) Limited | Manchester | 1969 |
| F. Smith & SON (Staines) Limited | Sutton Coldfield | 1959 |
| F. Whaler Limited | Newmarket | 1982 |
| F. Woodruff Funeral Directors Ltd | Bristol | 2023 |
| F.A.B Systems (UK) Limited | Newcastle Under Lyme | 2002 |
| F.A.B. Van & Camper Conversions Limited | Clevedon | 2021 |
| F.B. Mason & Co. Limited | Saundersfoot | 1998 |
| F.B. Mercer Limited | Blackburn | 1965 |
| F.B.Atkins Limited | Nottingham | 1933 |
| F.C. Business Operations Ltd | Gateshead | 1979 |
| F.C. Morgan (Removals) Limited | Knowsley | 1989 |
| F.C. Spear Limited | York | 1926 |
| F.E.J. Green & Sons Limited | Sutton Coldfield | 2000 |
| F.G. Pymm (Funeral Directors) Limited | Sutton Coldfield | 1975 |
| F.G.H. Pressings Limited | Burnley | 1995 |
| F.H. Bourner & Co. (Engineers) Limited | | 1930 |
| F.H. LEE Ltd | Liverpool | 1966 |
| F.H.D. Furnaces Limited | Slough | 2002 |
| F.I&R.E Ltd | Alcester | 2013 |
| F.J. Gibb Limited | Sutton Coldfield | 1998 |
| F.J.M. Associates Limited | Surrey | 1927 |
| F.K. Adcock & Co. Limited | Huddersfield | 1939 |
| F.L. Mildred and Sons (Funeral Directors) Limited | Sutton Coldfield | 1931 |
| F.L.D.A. Blades Limited | Sheffield | 1993 |
| F.L.T. Solutions Ltd | Wallsend | 2019 |
| F.M Enterprises Limited | London | 2026 |
| F.M. & J. Wait & Co. Limited | Sutton Coldfield | 2012 |
| F.N. Rice (Pirbright) Limited | Pirbright | 1996 |
| F.O.C.A. World Travel Limited | London | 1993 |
| F.R. Steve Fashion Limited | Suffolk | 2011 |
| F.T. Ridgley (Builders) Limited | Maidenhead | 1972 |
| F.T.I. (Worldwide) Limited | London | 2003 |
| F.T.Mossford & Co.,Limited | Cardiff | 1910 |
| F.W. Davies (Builders) Limited | Connah'S Quay | 1978 |
| F.W. Feary (Contractors) Limited | Boston | 2005 |
| F1 in Schools Limited | London | 2024 |
| F1 Support Limited | Woking | 2021 |
| F1 Wealth Management Limited | Stratford Upon Avon | 2011 |
| F10 Ltd | Bath | 2024 |
| F1RSTCORP Ltd | London | 2026 |
| F1TZROY Limited | Harrogate | 2020 |
| F1ZZ Ltd | Manchester | 2020 |
| F2IT Holdings Limited | Eastcote | 2014 |
| F3SYSTEMS Limited | Gatwick | 2016 |
| F8DOTCOM Limited | Manchester | 2019 |
| FA Cosmetics Ltd | London | 2023 |
| FA Factory Sweden Limited | London | 2022 |
| FA Industrial Enterprise Limited | Beckenham | 2010 |
| FA Wealth Ltd | Milton Keynes | 2011 |
| Fa.Dbt Ltd | Dover | 2022 |
| FAA Block Chain Fintech Co., Ltd | London | 2018 |
| Faabric Interiors Ltd | Aylesbury | 2025 |
| Faarro Ltd | Manchester | 2023 |
| Faay Fashion Limited | London | 2019 |
| FAB Competitions Limited | Rotherham | 2020 |
| FAB ERA Limited | Cheltenham | 2022 |
| Fab-Tech(Uk) Ltd | Newton Aycliffe | 2024 |
| Faber On-Demand Ltd | London | 1999 |
| Faber-Saks Lettings & Property Management Ltd | Leicester | 2017 |
| Faber-Saks Procurement & Supply Services Ltd | Leicester | 2017 |
| Faber-Saks Training Academy Ltd | Leicester | 2017 |
| Fabex Consulting Ltd | Dukinfield | 2026 |
| Fabien Birren Ltd | Nottingham | 2017 |
| Fabien Jewellers Ltd | Loughborough | 2024 |
| Fabien Limited | Harrogate | 2025 |
| Fabio's Tutti Quanti Levery Ltd | Dover | 2012 |
| Fabio's Tutti Quanti Ltd | Dover | 2012 |
| Fabiolous Consulting Limited | London | 2023 |
| Fabis Airconditioning Limited | Nottingham | 2011 |
| Fabis Solutions Limited | Nuneaton | 2016 |
| Fable & Fern Limited | Doncaster | 2026 |
| Fable and Willow Limited | Kidderminster | 2015 |
| Fable and Wolf Ltd | London | 2022 |
| Fableforged Ltd | Brighton | 2023 |
| Fables World Ltd | London | 2021 |
| Fabpartiesuk Ltd | London | 2019 |
| Fabric Care Research Association Limited | Melbourne | 2002 |
| Fabric Homes Ltd | Sutton Coldfield | 2018 |
| Fabric Living Limited | Birmingham | 2019 |
| Fabric of Football Limited | Hyde | 2018 |
| Fabrica Group Ltd | Huddersfield | 2017 |
| Fabrice Ltd | Harrogate | 2013 |