| Forty Plus People Ltd | Administrative & support | 2019 |
| Forty Properties Ltd | Real estate | 2025 |
| Fortytwo Worthing Limited | Hospitality | 2011 |
| Forum Europe Ltd | Administrative & support | 2005 |
| Forum Networks Ltd | Wholesale & retail | 2024 |
| Forward Artists Ltd | Professional & scientific | 2017 |
| Forward Events Ltd | Information & communication | 2023 |
| Forward Measures Limited | Professional & scientific | 2010 |
| Forward Ventures International Ltd | Wholesale & retail | 2025 |
| Forward Waste Management Limited | Administrative & support | 2006 |
| Forwardstyle Systems Limited | Information & communication | 2024 |
| Forzadiecast Ltd | Wholesale & retail | 2021 |
| Foshan Daryl Electronic Technology Co., Ltd | Extraterritorial | 2023 |
| Foskett Trading UK Limited | Wholesale & retail | 2016 |
| Fosse Driveways & Patios Ltd | Administrative & support | 2023 |
| Fosse Roofing Ltd | Construction | 2024 |
| Fossitt and Thorne (Lincoln) Limited | Transport & logistics | 1957 |
| Foster & Foster Ltd | Manufacturing | 2018 |
| Fostering Independence Team (Fit) Community Interest Company | Health & social care | 2026 |
| Fotgona Limited | Wholesale & retail | 2025 |
| Fotopolo Services Ltd | Administrative & support | 2021 |
| Fouchè Properties Ltd | Real estate | 2018 |
| Foundation Agency Ltd | Professional & scientific | 2020 |
| Foundation for Sport Coaching CIC | Arts & recreation | 2021 |
| Foundation Global Partners LLP | | 2011 |
| Foundations and Pathways Training Ltd | Administrative & support | 2026 |
| Foundese Ltd | Information & communication | 2019 |
| Foundry Recruitment Ltd | Administrative & support | 2018 |
| Foundry Ventures Ltd | Information & communication | 2016 |
| Foundry Yard Estates Ltd | Real estate | 2016 |
| Fountain Dental, Cosmetic & Implant Clinic Limited | Health & social care | 2011 |
| Four Brother Trading Limited | Wholesale & retail | 2025 |
| Four Face Films Ltd | Information & communication | 2023 |
| Four Forests Ltd | Wholesale & retail | 2025 |
| Four Point Auto Repairs Ltd | Wholesale & retail | 2026 |
| Four Roses Recovery Limited | Transport & logistics | 2025 |
| Four Seas Wellbeing Limited | Health & social care | 2003 |
| Four Seasons Coffee House Limited | Hospitality | 2023 |
| Four Seasons Total Solutions Ltd | Information & communication | 2011 |
| Four Square People Services Limited | Education | 2016 |
| Fourays Concepts and Innovative Services Limited | Hospitality | 2018 |
| Fourcroft Management Limited | Hospitality | 2021 |
| Fourcross Ltd | Wholesale & retail | 2019 |
| Fourever Sunshine Ltd | Real estate | 2021 |
| Fourkid Capital Limited | Financial services | 2025 |
| Foursixpioneer Solutions Limited | Professional & scientific | 2025 |
| Fourteen-A Limited | Education | 2008 |
| Fourtowns Care Limited | Other services | 2018 |
| Fourtwenty Consulting Limited | Information & communication | 2023 |
| Foveo Capital Limited | Information & communication | 2026 |
| Fovo Technology Ltd | Information & communication | 2017 |
| Fovty Services Ltd | Other services | 2019 |
| Fowl and Fury Ltd | Hospitality | 2021 |
| Fowler Commercials Limited | Manufacturing | 2009 |
| Fowler Consultancies Ltd | Health & social care | 2013 |
| Fowler Contractors Limited | Construction | 2017 |
| Fowler Demolition Ltd | Construction | 2024 |
| FOX & Wembridge Limited | Construction | 2024 |
| FOX (Emdecs) Ltd | Information & communication | 2018 |
| FOX Air Conditioning & Renewables Ltd | Construction | 2025 |
| FOX Air Conditioning Limited | Energy | 2023 |
| FOX and Hounds (Blackmill) Limited | Hospitality | 2012 |
| FOX and Irish Ltd | Hospitality | 2025 |
| FOX Branding Ltd | Professional & scientific | 2025 |
| FOX Development London Ltd | Administrative & support | 2016 |
| FOX Ecom LLP | | 2023 |
| FOX Fire Systems Limited | Construction | 2022 |
| FOX Networking UK Ltd | Construction | 2018 |
| FOX Properties Wales 2024 Limited | Financial services | 2024 |
| FOX Road Solutions Limited | Information & communication | 1996 |
| FOX the Mover Limited | Professional & scientific | 1983 |
| FOX Tree Surgery Ltd | Agriculture & fishing | 2018 |
| FOX Twenty One Ltd | Manufacturing | 2024 |
| Foxcon MGT Ltd | Construction | 2026 |
| Foxdale Sales L.P. | | 2016 |
| Foxglovehandmade Ltd | Wholesale & retail | 2025 |
| Foxhall Properties Limited | Real estate | 2003 |
| Foxira Ltd | Information & communication | 2025 |
| Foxland Group Limited | Other services | 2018 |
| Foxmex Ltd | Wholesale & retail | 2018 |
| Foxridge Property Management Ltd | Real estate | 2026 |
| Foxtoystore Ltd | Wholesale & retail | 2025 |
| Foxtrot Two Ltd | Other services | 2023 |
| Foxward Advisory Limited | Professional & scientific | 2023 |
| Foxx Holdings Limited | Real estate | 2017 |
| Foxy Beauty Limited | Other services | 2017 |
| Foxy Deli Limited | Hospitality | 2013 |
| Foyaite Limited | Wholesale & retail | 2025 |
| Foyal Contractors Ltd | Construction | 2023 |
| FP Codelab Limited | Wholesale & retail | 2023 |
| Fp&A Pro Ltd | Professional & scientific | 2025 |
| Fpbss Ltd | Construction | 2024 |
| FPC Civils Limited | Administrative & support | 2017 |
| Fpcs Consultancy Limited | Health & social care | 2021 |
| FPG Consulting Ltd | Other services | 2020 |
| FPH Rail Limited | Professional & scientific | 2017 |
| FPR Secure Solutions Ltd | Information & communication | 2019 |
| FPS Team Ltd | Administrative & support | 2024 |
| FPTRANSPORT77 Ltd | Transport & logistics | 2019 |
| FPV Group Limited | Arts & recreation | 2019 |