| Fayean Co., Limited | London | 2015 |
| Fayke Ltd | Bristol | 2022 |
| Fayms Care Ltd | Bradford | 2022 |
| Fayreborn Estates Limited | Staffordshire | 1992 |
| Fazantaa Ltd | Manchester | 2020 |
| Fazeley Street Limited | London | 2026 |
| FB Build Ltd | London | 2019 |
| FB Capital Nominees Limited | Damerham | 2014 |
| FB Curves 3D Gym MEN Limited | Cardiff | 2018 |
| FB Curves 3D Gym Trampoline Limited | Cardiff | 2018 |
| FB Curves 3D Gym Women Limited | Cardiff | 2018 |
| FB Fashion Ball Limited | Leeds | 2013 |
| FB Holdings Limited | Macclesfield | 2008 |
| FB Realisations 2011 Limited | London | 1997 |
| FBA Books Ltd | Worthing | 2010 |
| FBA Group Limited | Aberystwyth | 2003 |
| FBA Zone Ltd | Glasgow | 2025 |
| FBG Brewery Holdings UK Limited | London | 1990 |
| FBG Treasury (UK) Limited | London | 1987 |
| FBM Babcock Marine Limited | London | 1964 |
| FBN Limited | London | 2010 |
| FC Property Nominees Limited | Bilston | 2022 |
| FC Secretarial Services Limited | Belfast | 2000 |
| FCC ENG & Construction Co., Ltd | Beckenham | 2014 |
| FCC Global Ltd | Reading | 2023 |
| FCC Services Limited | Kingston | 2008 |
| Fccp Consulting Services Limited | Mirfield | 2018 |
| FCD Estates Ltd | London | 2021 |
| Fcellin Ltd | Kington | 2025 |
| Fcellma Ltd | London | 2025 |
| FCF Trade Ltd | London | 2023 |
| FCI Services Limited | Cardiff | 2022 |
| FCL Fire Ltd | Wantage | 2024 |
| Fclg Limited | Bicester | 2019 |
| Fclgroup Limited | Bicester | 2019 |
| Fcls Holdings Limited | Bristol | 2003 |
| Fcls RM 3 Limited | London | 2020 |
| Fcms Dental Limited | Blackpool | 2013 |
| FCN Homecare Ltd | Stratford-Upon-Avon | 2021 |
| Fcnt Ltd | Glasgow | 2023 |
| Fcra 2 Limited | Coventry | 2012 |
| FCS Holdings (South) Limited | Gosport | 2023 |
| FCS Investments Limited | Cannock | 2009 |
| FCT Trading Limited | Epsom | 2011 |
| Fcww.Com Limited | Colnbrook Slough | 2001 |
| FCX Flow Control Limited | Surrey | 1995 |
| FD Commercial Finance Limited | Preston | 2004 |
| FD Excel Ltd | Basingstoke | 2013 |
| FD Online Limited | Southampton | 2015 |
| FD Surveys Ltd | Cranbrook | 2023 |
| FD30 Fire Doors Ltd | Manchester | 2025 |
| FDA Limited | Watford | 1998 |
| Fdeb Ltd | Coventry | 2018 |
| FDI Intelligence Limited | Belfast | 2001 |
| FDL (UK) Limited | Stockport | 2010 |
| FDM Residence Limited | Ramsgate | 2022 |
| FDP Properties Limited | Sturminster Newton | 2002 |
| FDS Aggregates Limited | Wimborne | 2024 |
| FDS Recycling (U.K) Limited | Wimborne | 2017 |
| Fdsgb Ltd | Swindon | 2024 |
| FDT (Holdings) Ltd | Salford | 2002 |
| FDT Associates Ltd | Salford | 1996 |
| FE (London) Limited | London | 2003 |
| FE Ardeer Wind Limited | Faversham | 2021 |
| FE Barnard Castle Solar Ltd | Faversham | 2021 |
| FE Felixstowe Solar Ltd | Faversham | 2021 |
| FE Knottingley Grid Ltd | Faversham | 2021 |
| FE News.Co.Uk Ltd | Exeter | 2004 |
| FE Swinlees Wind Limited | Faversham | 2021 |
| FE Ware Solar Limited | Faversham | 2021 |
| Feaapps Ltd | Chester | 2020 |
| Feakins OIL Recoveries Limited | Llandrindod Wells | 2010 |
| Feamainn Ltd | Tarbert | 2020 |
| Feanor Limited | Herts | 2003 |
| Fearnought Club Ltd | Sheffield | 2024 |
| Feart Ltd | Motherwell | 2014 |
| Feast and Foliage Rutland Limited | Grantham | 2024 |
| Feast Masters Ltd | London | 2018 |
| FEAST21 Ltd | London | 2021 |
| Feat Services Ltd | London | 2020 |
| Feather and Heath Ltd | Bristol | 2024 |
| Feather and Shell Ltd | Elstree | 2017 |
| Featherglade Limited | Sutton Coldfield | 1988 |
| Feathers Wharf Ltd | Ivybridge | 1998 |
| Featherstone Batteries Limited | Luton | 2022 |
| Featherstone Land Ltd | Haslemere | 2022 |
| Feature Lighting Limited | West Wickham | 2019 |
| FEB Secretaries Limited | Belfast | 2001 |
| Febo Trading Limited | Manchester | 2013 |
| Febra (UK) Limited | Harrow | 2000 |
| FEC (Eight) Limited | Faversham | 2021 |
| FEC (Nine) Limited | Faversham | 2021 |
| FEC (TEN) Limited | Faversham | 2021 |
| FEC (Two) Limited | Faversham | 2021 |
| FEC Energy Limited | Kenilworth | 2019 |
| Fecaxia Management, Ltd | London | 2019 |
| FED Interiors Limited | Ilkeston | 2009 |
| Fedenergy Limited | Nantwich | 2025 |
| Federal Finance Incorporated Ltd | Leicester | 2016 |
| Federal-Mogul Shoreham Limited | Leeds | 1940 |