| Flygear Ltd | Brackley | 2023 |
| Flygfisk Ltd | London | 2018 |
| Flying Bees Ltd | Torquay | 2020 |
| Flying Blue JAY Ltd | London | 2022 |
| Flying Buddha Limited | Solihull | 2023 |
| Flying Colours Smart Repairs Ltd | Whitstable | 2023 |
| Flying Ducks Producktions Limited | Coven | 2013 |
| Flying Fridge Limited | Worksop | 2024 |
| Flying Goldhorse Co., Limited | Beckenham | 2018 |
| Flying Hotdogs Limited | Milton Keynes | 2022 |
| Flying Manta Ltd | London | 2026 |
| Flying Textile Co. Ltd | Beckenham | 2018 |
| Flying Tiger Soup Kitchen Ltd | Wadebridge | 2024 |
| Flying Yacht Ltd | Blackpool | 2018 |
| Flynews Ltd | Birmingham | 2016 |
| Flynn Honetana Oliver-Johnston Limited | London | 2024 |
| Flynn's Building Supplies Limited | Coventry | 1971 |
| Flyover House Limited | High Wycombe | 1995 |
| Flyprivately Limited | Malton | 2016 |
| Flysch Ltd | Tonbridge | 2025 |
| Flyscreen Queen Ltd | Thetford | 2010 |
| Flysight Space Ltd | Mansfield | 2020 |
| Flytal Trading Co., Ltd | London | 2025 |
| Flytel Limited | Harrow | 2005 |
| Flytthem.Se Limited | London | 2023 |
| Flzz Industries Group Limited | Beckenham | 2016 |
| FM Branding Limited | Stourbridge | 2013 |
| FM Coatings (North East) Limited | Boldon | 2013 |
| FM Cosmetics UK Ltd | Weybridge | 2007 |
| FM Hatton Group Limited | Colchester | 2016 |
| FM Medical Ltd | Birmingham | 2023 |
| FM Studios Limited | Hamilton | 2017 |
| FM2X Limited | Wingrave | 2007 |
| FMA Motor Sales Ltd | Irvinestown | 2015 |
| FMB Consultants Limited | London | 1981 |
| FMB Invest Limited | London | 2025 |
| FMB Publications Limited | London | 1983 |
| Fmcg Gurus Ltd | St. Albans | 2015 |
| Fmcg Online Limited | West Drayton | 2022 |
| Fmdc Employee Trustee Limited | Hertford | 2023 |
| FME Facility Management & Engineering Limited | Doncaster | 2024 |
| FMF Newco Altech Ltd | Newport | 2014 |
| Fmhelpdesk Limited | Crowborough | 2004 |
| FMJ Hard Metals Limited | Romford | 2005 |
| Fmkm Limited | East Kilbride | 2009 |
| FMP Construction Joint Venture Limited | Belfast | 2013 |
| FMS (Coleshill) Holdings Limited | Birmingham | 2016 |
| FMS (IBS) Holdings Limited | Birmingham | 2016 |
| FMS Partners Limited | Cardiff | 2018 |
| Fmvoicestudio Ltd | London | 2019 |
| FN Limited | Erith | 2007 |
| FND Properties Limited | Littleborough | 2005 |
| Fnpr Holdings Limited | Harrogate | 2006 |
| FNZ Foundation | London | 2020 |
| FNZ Wealth Gross Nominees Limited | London | 2013 |
| FNZ Wealth Nominees Limited | London | 2013 |
| FO Baltic Wharf Developments Limited | London | 2025 |
| FO Baltic Wharf Investments Limited | London | 2025 |
| FO Fashion UK Ltd. | Beckenham | 2022 |
| FO New Road Investments Limited | London | 2023 |
| FO Quorum Bristol Investments Limited | London | 2023 |
| Foam Direct Ltd | London | 2020 |
| Foam for Home Wholesale Ltd | Bristol | 2013 |
| Foam on the Reef Ltd | London | 2020 |
| Foam Plus Limited | Glasgow | 2001 |
| FOB Rent Corporation Limited | Beckenham | 2018 |
| Fobbing Properties Limited | London | 2024 |
| Foca Trading Limited | London | 2016 |
| Focal Drinks Ltd | Bristol | 2023 |
| Focal Investments Ltd | Hampton | 2018 |
| Focalpoint Solutions Limited | Oakham | 1998 |
| Focass Ltd | London | 2024 |
| Foccy Ltd | London | 2025 |
| Focus Agency Group Trustee Limited | Feering | 2024 |
| Focus City Limited | Ascot | 2010 |
| Focus Clinic Limited | London | 2018 |
| Focus D.I.Y. Direct Limited | Hull | 2011 |
| Focus Electrical Limited | St Leonards On Sea | 2019 |
| Focus Electronics Ltd | London | 2008 |
| Focus Flooring Limited | Hereford | 2014 |
| Focus Healthcare Consulting Ltd | Hitchin | 2025 |
| Focus Hygiene Supplies Limited | Bradford | 1990 |
| Focus Independent Financial Advisers Limited | Richmond | 1990 |
| Focus Insurance Consultants Ltd | Richmond | 2015 |
| Focus Investment Management Ltd | Edinburgh | 2012 |
| Focus JAY Limited | London | 2024 |
| Focus Leasing Limited | Romsey | 2005 |
| Focus on Plants Limited | Honiton | 2010 |
| Focus Oxford Risk Management Ltd | High Wycombe | 2025 |
| Focus Payroll Limited | Maidstone | 2004 |
| Focus Property Ltd | Hampton | 2017 |
| Focus Quantity Surveying Limited | Birmingham | 2014 |
| Focus Style Limited | Crawley | 1999 |
| Focus Y.T.A Group Co., Limited | Kenilworth | 2018 |
| Focus Yachting Limited | London | 2025 |
| Focused Facilities Management Ltd | Chelmsford | 2016 |
| Focused Healthcare Limited | Lichfield | 2007 |
| Focused Outcomes Ltd | London | 2011 |
| Focusing Pursuits Ltd | York | 2015 |
| Focuslevel Limited | Nottingham | 2015 |