| Founders Collection | Bath | 2017 |
| Founders PG Limited | Chelmsford | 1960 |
| Founding Concepts Limited | Evesham | 2011 |
| Foundry 3 Trustee Limited | Windsor | 2024 |
| Foundry Place Management Company Limited | Towcester | 2004 |
| Foundrychem International Development Co., Ltd | London | 2012 |
| Foungo Group Holdings Limited | Beckenham | 2013 |
| Fountain Control Solutions Limited | Horsham | 2015 |
| Fountain Court Chambers Limited | East Grinstead | 1989 |
| Fountain Court Limited | East Grinstead | 1989 |
| Fountain Marketing Group Limited | Norwich | 2016 |
| Fountain Marketing Limited | Norwich | 2019 |
| Fountain Trailers Limited | Boston | 2003 |
| Four Acer Ltd | Manchester | 2023 |
| Four Agency Ltd | Norwich | 2008 |
| Four Broadgate Mainland Limited | London | 1994 |
| Four Cornwallis Ltd | Brighton | 2014 |
| Four Counties Pools Limited | Stratford Upon Avon | 2005 |
| Four D Management Services Limited | Belfast | 2015 |
| Four Enterprise Limited | Birmingham | 2005 |
| Four Flats Hastings Road RTM Company Limited | Pembury | 2012 |
| Four Group Limited | Stamford | 2006 |
| Four Mazenod Avenue Ltd | Horsham | 2015 |
| Four Mile Trading Co. Limited | Dalkeith | 1999 |
| Four Oaks Advisory (Holdings) Limited | London | 2016 |
| Four Oaks Financial Planning Limited | Milton Keynes | 2007 |
| Four One Limited | Henfield | 2002 |
| Four Quarters Polo 23 Limited | Cheltenham | 2023 |
| Four Rain Limited | London | 2002 |
| Four Seasons Farming Limited | Dunstable | 2003 |
| Four Seasons Garden Products Limited | Eastbourne | 1962 |
| Four Seasons Health Care (Scotland) Ltd | Musselburgh | 2019 |
| Four Seasons Landscapes Limited | Bristol | 1999 |
| Four Square (Scotland) Trading Limited | Edinburgh | 2007 |
| Four Square Building Services Limited | Burton Upon Trent | 1997 |
| Four Star Group Limited | Beckenham | 2018 |
| Four Star Products Limited | Honiton | 2002 |
| Four Triangle Limited | Harrow | 2016 |
| Four Units Hatfield Management Company Limited | Hatfield | 2015 |
| Four Yildiz Ltd | London | 2025 |
| Four's Force Yachting Ltd | London | 2024 |
| Four-Legged Films Limited | London | 2024 |
| Foura Industrial Holding Co., Ltd. | Kenilworth | 2017 |
| Fourbe Future Mind Ltd | Manchester | 2023 |
| Fourboss Yachting Co. Ltd | Cambridge | 2025 |
| Fourdimes Ltd | Manchester | 2002 |
| Fourfathers Limited | London | 2013 |
| Fourfiveone Limited | Hampton | 2002 |
| Fourlet (Saufc) Limited | Aberdeen | 2008 |
| Fourm Limited | Dundee | 2015 |
| Fournir Limited | Blackpool | 2005 |
| Foursight Interim Management Limited | Sutton Coldfield | 2012 |
| Foursquare Gospel Church (Alithia Centre) Plaistow Limited | Canvey Island | 2008 |
| Fourstar Consulting Ltd | London | 2020 |
| Fourth Capital Limited | Brighton | 2021 |
| Fourth Dimension Investments Limited | London | 2018 |
| Fourth Platform Limited | Horsham | 2019 |
| Fourway Maritime Corporation (UK) Limited | Southampton | 2014 |
| Fourways Properties Limited | London | 1987 |
| Foutu World Ltd | Ibstock | 2023 |
| Fovia (Innovation) Limited | Uxbridge | 2001 |
| Fowler Valves&Controls Limited | London | 2013 |
| Fowles Developments Limited | Wraysbury | 2023 |
| Fowles Group Limited | Wraysbury | 2023 |
| Fowles Skip Hire Limited | Wraysbury | 2023 |
| Fowlie Farms Limited | Peterhead | 2016 |
| Fownes Gloves Limited | Warminster | 1935 |
| FOX & Co Developments Ltd | Northampton | 2021 |
| FOX & Co Groundworks Ltd | Northampton | 2021 |
| FOX & Hound Hotel Ltd | Leeds | 2024 |
| FOX Aero Design and Engineering Limited | Milton Keynes | 2009 |
| FOX Agri Ltd | Omagh | 2019 |
| FOX and Llama Partners Limited | Huddersfield | 2025 |
| FOX Company Investments Ltd | Birmingham | 2024 |
| FOX FIX Property Maintenance Ltd | Mildenhall | 2024 |
| FOX Grant Partnerships Limited | Salisbury | 2006 |
| FOX Gregory Residential Lettings Limited | London | 2009 |
| FOX Mayfair Limited | London | 2014 |
| FOX Murphy Limited | Barnstaple | 2015 |
| FOX Pizzas Ltd | Billericay | 2020 |
| FOX Security Limited | Barnet | 2011 |
| FOX Studios Limited | Plymouth | 2014 |
| FOX Sumner Limited | London | 2015 |
| FOX Thorn Smith Limited | Dereham | 2014 |
| FOX Visual Systems Ltd | Loughton | 2009 |
| Foxall and Chapman Limited | Sheffield | 1949 |
| Foxbond Limited | Drinkstone | 2010 |
| Foxbridge Orchards Limited | Bedale | 2012 |
| Foxburgh Limited | Broxburn | 1992 |
| Foxbury Estates Limited | Oxford | 2024 |
| Foxcore Limited | Carshalton | 2025 |
| Foxcote Holdings Limited | Paignton | 2017 |
| Foxcote Management Ltd | Edinburgh | 2012 |
| Foxcotte Veterinary Clinics Limited | Bristol | 2010 |
| Foxdown Holdings Limited | East Sussex | 2005 |
| Foxenden Limited | Cranbrook | 1991 |
| Foxes Sales Limited | Bournemouth | 2014 |
| Foxfield Group Ltd | Petersfield | 2026 |
| Foxgate Limited | Merthyr Tydfil | 1983 |
| Foxglove Energy Trading Limited | Leicester | 2014 |