| Faynic Properties & Lettings Ltd | Administrative & support | 2020 |
| Fayr Limited | Wholesale & retail | 2025 |
| Fayrli Ltd | Professional & scientific | 2021 |
| Fayrouz Restaurant Ltd | Hospitality | 2018 |
| Fayyaz Khan Limited | Wholesale & retail | 2013 |
| FAZ Foods Limited | Hospitality | 2023 |
| FAZ Handyman Services Ltd | Manufacturing | 2023 |
| FAZ Page Osteopathy Limited | Health & social care | 2017 |
| Fazal Ltd | Wholesale & retail | 2004 |
| Fazami Ltd | Professional & scientific | 2017 |
| Fazantaa Ltd | Extraterritorial | 2020 |
| Fazkay Ltd | Professional & scientific | 2025 |
| FB Beauty Ltd | Wholesale & retail | 2009 |
| FB Corporation Limited | Professional & scientific | 2023 |
| FB Grooming Limited | Other services | 2024 |
| FB Investors LLP | | 2017 |
| FB Management Consultancy Limited | Professional & scientific | 2023 |
| FB Properties MCR Ltd | Real estate | 2016 |
| FBA Trading Ltd | Wholesale & retail | 2019 |
| Fbaasa Ltd | Hospitality | 2020 |
| FBC Ltd | Information & communication | 2019 |
| FBG Developments Ltd | Professional & scientific | 2025 |
| FBH Workspace Solutions Ltd | Administrative & support | 2026 |
| Fblm Limited | Wholesale & retail | 2019 |
| FBM Marine International (UK) Limited | Professional & scientific | 1990 |
| Fbpnm Ltd | Health & social care | 2016 |
| Fbrstudios Ltd | Professional & scientific | 2026 |
| FBS Builders Ltd | Construction | 2022 |
| FBV Europe Limited | Administrative & support | 2013 |
| FC Comms Ltd | Professional & scientific | 2021 |
| FC Construction Group Ltd | Construction | 2019 |
| FC Ledgers Ltd | Professional & scientific | 2025 |
| FC Lights Trading Limited | Wholesale & retail | 2025 |
| FC Physio Ltd | Health & social care | 2024 |
| FC Praetura Ventures L.P. | | 2022 |
| FC Property & Development Ltd | Real estate | 2024 |
| FC Sales Ltd | Wholesale & retail | 2022 |
| FC Sportswear and Retail Services Limited | Wholesale & retail | 2022 |
| FC Travel Ukcn Ltd | Transport & logistics | 2021 |
| FC United Facilities Limited | Hospitality | 2015 |
| FCB B&R Holdings Ltd | Financial services | 2026 |
| FCC Ltd | Professional & scientific | 2024 |
| Fccc Holdings Ltd | Administrative & support | 2012 |
| FCD One Ltd | Real estate | 2019 |
| FCD Three Limited | Construction | 2021 |
| FCD Two Limited | Construction | 2020 |
| Fcdl & Civils Ltd | Construction | 2026 |
| Fced Ltd | Construction | 2026 |
| FCF (UK) Limited | Wholesale & retail | 2012 |
| Fcfa Properties Ltd | Real estate | 2023 |
| FCG Operating Co. Ltd | Hospitality | 2008 |
| FCM Skip Hire Ltd | Water & waste | 2015 |
| Fcmig (UK) Limited | Construction | 2025 |
| FCN Properties Ltd | Real estate | 2019 |
| FCN Treats Limited | Wholesale & retail | 2026 |
| FCR Electrical and Mechanical Ltd | Construction | 2015 |
| FCR Media UK Limited | Administrative & support | 2015 |
| Fcse Ltd | Wholesale & retail | 2019 |
| FD (Manchester) Ltd | Hospitality | 2017 |
| FD Direct (NW) Limited | Professional & scientific | 2016 |
| FD30 Fire Doors Ltd | Extraterritorial | 2025 |
| FDC Field Design Consultancy Limited | Professional & scientific | 2016 |
| FDC Waltham Forest Ltd | Health & social care | 2016 |
| FDG Properties Limited | Real estate | 2017 |
| FDH Touring Ltd | Financial services | 2025 |
| Fdhd MCR Ltd | Other services | 2022 |
| Fdkm Ltd | Construction | 2019 |
| Fdml Holdings Limited | Financial services | 1956 |
| Fdvb Group Ltd | Construction | 2025 |
| FE Tech Limited | Information & communication | 2021 |
| Fe&Sa Ltd | Households | 2026 |
| Fear Records Ltd | Arts & recreation | 2019 |
| Feast-In Ltd | Hospitality | 2020 |
| Feastpot Ltd | Wholesale & retail | 2026 |
| Feather Apparel Limited | Wholesale & retail | 2024 |
| Feather Noir Training Academy Ltd | Other services | 2019 |
| Feather Skin Limited | Wholesale & retail | 2020 |
| Featherbed Tales Ltd | Information & communication | 2019 |
| Feathers and Threads Fashion Ltd | Wholesale & retail | 2025 |
| Feathers International Ltd | Real estate | 2020 |
| Featherswood Limited | Professional & scientific | 1989 |
| FEB81 Limited | Information & communication | 2015 |
| Feblet Technologies Ltd | Information & communication | 2012 |
| Febo Trading Limited | Extraterritorial | 2013 |
| FEC Development Management Ltd | Real estate | 2014 |
| FEC GMP1 Limited | Construction | 2024 |
| FEC Northern Gateway Development Limited | Construction | 2017 |
| FEC Overseas Investment (UK) Limited | Financial services | 2018 |
| FEC Trafford Limited | Construction | 2024 |
| Fedea Construction Ltd | Construction | 2026 |
| Federal Cafe 3 Limited | Hospitality | 2020 |
| Federal Cafe 4 Limited | Hospitality | 2021 |
| Federal Cafe Limited | Hospitality | 2016 |
| Federal Holdings Limited | Professional & scientific | 2023 |
| Federal Retail and Trading Services Limited | Administrative & support | 2014 |
| Federal-Mogul Asia Investments Limited | Financial services | 2013 |
| Federal-Mogul Bradford Limited | Professional & scientific | 1910 |
| Federal-Mogul Controlled Power Limited | Manufacturing | 2017 |
| Federal-Mogul Coventry Limited | Manufacturing | 1911 |
| Federal-Mogul Employee Trust Administration Limited | Professional & scientific | 2005 |