| FST Group Holdings Ltd | Financial services | 2025 |
| Fstm Ltd | Hospitality | 2018 |
| FT Car Repairs Limited | Wholesale & retail | 2025 |
| FT Leicester Limited | Hospitality | 2024 |
| FT Moto Limited | Wholesale & retail | 2023 |
| FT Solutions (GB) Ltd | Hospitality | 2021 |
| FT Solutions Paye (GB) Ltd | Hospitality | 2023 |
| FT Taxis Ltd | Transport & logistics | 2026 |
| FTC Asset Tracking Ltd | Extraterritorial | 2014 |
| FTC Safety Solutions Limited | Manufacturing | 2014 |
| Ftex Hub Ltd | Wholesale & retail | 2023 |
| Fthr Limited | Other services | 2025 |
| FTK Property Management. Ltd | Administrative & support | 2018 |
| FTL Pharm Ltd | Wholesale & retail | 2022 |
| FTM Business Ltd | Wholesale & retail | 2025 |
| FTR Properties Ltd | Real estate | 2022 |
| FTR Residential Ltd | Real estate | 2024 |
| Ftribe Limited | Health & social care | 2025 |
| Ftsd Logistics Ltd | Transport & logistics | 2025 |
| Ftse Limited | Health & social care | 2005 |
| Ftsh Leicester Ltd | Hospitality | 2021 |
| Fuchsia Consultancy Ltd | Professional & scientific | 2019 |
| Fudal Ltd | Extraterritorial | 2017 |
| Fudge Puppy Limited | Wholesale & retail | 2023 |
| Fuel Dynamics Limited | Manufacturing | 1990 |
| Fuel Lagoon Camping Accessories Limited | Wholesale & retail | 2020 |
| Fufu Estates Limited | Real estate | 2026 |
| Fugen Healthcare Ltd | Wholesale & retail | 2021 |
| Fulcrum Automotive Solutions Limited | Administrative & support | 2011 |
| Fulcrum Automotive Solutions Trustees Limited | Professional & scientific | 2025 |
| Fulcrum Healthcare Ltd | Public administration | 2022 |
| Fulcrum Service Management Limited | Administrative & support | 2016 |
| Fulfil Business Solutions Limited | Administrative & support | 2014 |
| Fulfilmentnetwork Ltd | Transport & logistics | 2023 |
| Fulfords Property Investments Limited | Real estate | 2017 |
| Fulham Parent Limited | Financial services | 2020 |
| Full Body Imaging Ltd | Health & social care | 2014 |
| Full House Property Group Ltd | Real estate | 2024 |
| Full Metal Fabrications Limited | Manufacturing | 2007 |
| Full Squad Limited | Construction | 2023 |
| Full Square Limited | Manufacturing | 2005 |
| Fullcroft Limited | Transport & logistics | 2000 |
| Fullhurst Learning Partnership | Education | 2010 |
| Fully Checked Ltd | Real estate | 2023 |
| Fulwood ASH Ltd | Wholesale & retail | 2025 |
| Fummaa Ltd | Wholesale & retail | 2022 |
| Fumme Online Limited | Wholesale & retail | 2023 |
| Fumo Trades Ltd | Wholesale & retail | 2025 |
| Fums Consultancy Ltd | Public administration | 2026 |
| FUN Valley (Birmingham) Ltd | Arts & recreation | 2026 |
| FUN Valley (Nottingham) Ltd | Arts & recreation | 2022 |
| FUN Valley (Peterborough) Ltd | Arts & recreation | 2025 |
| FUN Valley Ltd | Arts & recreation | 2012 |
| Funchris Care Ltd | Health & social care | 2022 |
| Functional Products Ltd | Wholesale & retail | 2008 |
| Functional Studios Ltd | Professional & scientific | 2022 |
| Fundestra Limited | Other services | 2011 |
| Funding Focus (Commercial Finance) Limited | Financial services | 2020 |
| Funeral Group Limited | Other services | 2017 |
| Funghaul Supply Chain Managment (UK) Ltd | Wholesale & retail | 2024 |
| Funkee Monkey Ltd | Wholesale & retail | 2024 |
| Funky NUT Company Limited | Extraterritorial | 2022 |
| Funnel Glow Limited | Information & communication | 2024 |
| FUR- Friends Limited | Manufacturing | 2025 |
| Furever Sidekick Ltd. | Wholesale & retail | 2025 |
| Furi Wheels Ltd | Other services | 2018 |
| Furkan.Co.Uk Ltd | Other services | 2020 |
| Furleys (Furnishers) Limited | Wholesale & retail | 1976 |
| Furnco Trading Ltd | Wholesale & retail | 2018 |
| Furnicomp Ltd | Wholesale & retail | 2018 |
| Furniss Management Consulting Limited | Extraterritorial | 2014 |
| Furniture Online Global Ltd | Wholesale & retail | 2000 |
| Furnival Unions Ltd | Wholesale & retail | 2025 |
| Furnley House Limited | Financial services | 2014 |
| Furqan Cafe Ltd | Hospitality | 2019 |
| Furqan Shop Ltd | Wholesale & retail | 2019 |
| Furry Luxe Co Ltd | Extraterritorial | 2024 |
| Furrytail Audio Ltd | Information & communication | 2025 |
| Furze Health Ltd | Real estate | 2021 |
| Fuses Electrical Ltd | Construction | 2022 |
| Fusic Limited | Hospitality | 2018 |
| Fusion + Consulting Services LLP | | 2007 |
| Fusion 360 Group Ltd | Construction | 2002 |
| Fusion Accounting Ltd | Professional & scientific | 2016 |
| Fusion Acquisitions Limited | Real estate | 2025 |
| Fusion Consulting Services Ltd | Administrative & support | 2016 |
| Fusion Electrics Limited | Construction | 2026 |
| Fusion Engineering Limited | Manufacturing | 1999 |
| Fusion Feastsss Limited | Hospitality | 2025 |
| Fusion Living Limited | Wholesale & retail | 2016 |
| Fusion Medical Services Ltd | Health & social care | 2015 |
| Fusion Paper Transfer Limited | Manufacturing | 2017 |
| Fusion Pharma Properties Ltd | Real estate | 2024 |
| Fusion Plumbing & Heating (Leic) Ltd | Construction | 2025 |
| Fusion Print and Display Limited | Manufacturing | 2024 |
| Fusion Regulatory Strategy and Science Limited | Professional & scientific | 2016 |
| Fusionech WS Sales Ltd | Wholesale & retail | 2025 |
| Fusionflow Heating & Plumbing Ltd | Construction | 2025 |
| Futtocksend Ltd | Real estate | 2006 |
| Future Analytics Ltd | Professional & scientific | 2020 |