| FOD Electronics Company Limited | Beckenham | 2013 |
| FOD Mobility Group Limited | Shipley | 2017 |
| Foeyks Ltd | Salford | 2009 |
| FOG Down My Drain Limited | Dunmow | 2013 |
| Fogher UK Limited | Colchester | 2024 |
| Fogless Limited | Ipswich | 1988 |
| Fogmaker UK Ltd | Hoddesdon | 2016 |
| Fogo Power Systems Limited | Bicester | 2016 |
| Fogt Ltd | Alton | 2003 |
| Fogus Paphiel P. Invest Limited | London | 2023 |
| Fogus Paphiel P. Limited | London | 2023 |
| Foil Marine Limited | London | 2024 |
| Foinoe (UK) Ltd | Stafford | 2015 |
| Foisonu International Limited | Beckenham | 2024 |
| Fokale Ltd | London | 2024 |
| Fokam Ltd | Manchester | 2023 |
| Fokus Energi Invest Limited | London | 2021 |
| Fokus Energi Limited | London | 2021 |
| Fokus Holding Limited | London | 2018 |
| Fokus Norge Limited | London | 2011 |
| Folberry Ltd | Coventry | 2024 |
| Folbro Gravel Assets Limited | Marlow | 1991 |
| Foldability Limited | London | 2014 |
| Foldafile Limited | | 2001 |
| Foldafile.Com Limited | | 2001 |
| Folder Holdings Ltd | Norwich | 2023 |
| Folding Space Limited | Colindale | 2001 |
| Foleshill Cash&Curry Ltd | Hemel Hempstead | 2025 |
| Foley Farms Trust Company Limited | Hereford | 2001 |
| Foliage and Form Flower Company Limited | Bristol | 2023 |
| Foliar Concept Limited | Honiton | 1994 |
| Foljambe Estates Limited | Worksop | 2015 |
| Folkestone and Dover Water Services Limited | Hatfield | 1998 |
| Folkington's Limited | Arlington | 2010 |
| Folkton Manor Barn Ltd | Scarborough | 2022 |
| Folland Joinery Limited | Port Talbot | 1997 |
| Folley Properties (Investments) Limited | London | 1986 |
| Follies ALC Ltd | London | 2022 |
| Folly Enterprises Limited | Buckingham | 2014 |
| Follyfoot Ltd | London | 2008 |
| Follygate Ltd | London | 2013 |
| Foltex Limited | Leicester | 1982 |
| Foltex UK Laundry Technology Limited | Brackley | 2015 |
| Fomac Process System Co., Ltd | London | 2016 |
| Fomo Mortgages Limited | Crowthorne | 2021 |
| Fomo Technology Co., Limited | Cambridge | 2017 |
| Fonab Ltd | Manchester | 2012 |
| Fondtron Limited | Gloucester | 2024 |
| Fonecity Bham Ltd | Birmingham | 2016 |
| Fong's Happy House Limited | Glasgow | 2010 |
| Fonster Direkt Invest Limited | London | 2022 |
| Fonster Direkt Limited | London | 2022 |
| Font Bundles Limited | Stoke-On-Trent | 2020 |
| FONT2020 Limited | London | 2015 |
| Fontaine Place Management Company Limited | Belfast | 2004 |
| Fontayne Ltd | London | 2016 |
| Fontessa Limited | Witham | 1959 |
| Fonthill Estate Nominees (NO1) Limited | Salisbury | 2023 |
| Fonthill Estate Nominees (NO2) Limited | Salisbury | 2023 |
| Fonthill Furniture and Antiques Ltd | London | 2016 |
| Fonthill Road Hove RTM Company Limited | Hove | 2025 |
| Fonthillbishop Ltd | Northampton | 2008 |
| Fontinella Foods Limited | London | 1995 |
| Food & Beverage (RRL) Limited | Sydenham | 1971 |
| Food & Juice Corner Ltd | Hayes | 2018 |
| Food & Safety on a Plate Ltd | London | 2018 |
| Food and FAT Recovery Solutions Limited | Cardiff | 2019 |
| Food by Mdme Ltd | Romford | 2016 |
| Food City Limited | Wembley | 2019 |
| Food Event Limited | London | 2017 |
| Food Fest Ltd | Harrogate | 2012 |
| Food Industry Supplies Ltd | Thatcham | 1992 |
| Food N'Joy Ltd | South Cave | 2022 |
| Food Safety Guru Ltd | Harrow | 2016 |
| Food to Home Limited | Bridgwater | 2020 |
| Food Trition Ltd | London | 2013 |
| Food UN Limited | Swansea | 2013 |
| Food&Life Ltd | London | 2025 |
| Foodbible Limited | Manchester | 2017 |
| Foodbox Limited | Leeds | 2006 |
| Foodfab Ltd | Spalding | 2015 |
| Foodie Kids Limited | Chobham | 2019 |
| Foodie Wines Limited | Durham | 2021 |
| Foodies Fuel Limited | Maldon | 2025 |
| Foodiskingproductions Limited | London | 2021 |
| Foodlife Limited | Cheadle | 1999 |
| Foodnotes Limited | Chichester | 2024 |
| Foodpak Limited | Basildon | 2013 |
| Foodpreneurs Collective Limited | Maidenhead | 2016 |
| Foodpro (Manufacturing) Limited | Dumfries | 2012 |
| Foods & Inns (UK) Ltd | Ilford | 1980 |
| Foodtex Limited | Worksop | 2009 |
| Foodway International Trade Co., Ltd. | Beckenham | 2015 |
| Foodwey Ltd | London | 2018 |
| Fooked Industries UK Limited | St. Helens | 2023 |
| Foolex Ltd | London | 2024 |
| Foor 20 Ltd | Glasgow | 2017 |
| Foot and Ankle Centre Limited | 66B Station Road North Chingford | 2003 |
| Foot Angel (South) Limited | Bognor Regis | 2010 |
| Foot Angel Limited | Bognor Regis | 2011 |