| Five Oaks Events Ltd | Hospitality | 2015 |
| Five One Films Ltd | Information & communication | 2019 |
| Fixeroo Tech Ltd | Information & communication | 2026 |
| FJ Retail UK Limited | Wholesale & retail | 2025 |
| FJN Group Ltd | Administrative & support | 2007 |
| Flat Space Art Limited | Wholesale & retail | 2019 |
| Flatfield Woodlands Limited | Agriculture & fishing | 2024 |
| Flava Clothing Ltd | Wholesale & retail | 2020 |
| Flawless Beauty and Nails Ltd | Other services | 2015 |
| Flawless Lashes Limited | Other services | 2014 |
| Flax Farm Ltd | Manufacturing | 2011 |
| Fleetway Clutches Limited | Wholesale & retail | 2004 |
| Flembos Consulting Services Ltd | Professional & scientific | 2010 |
| Fletching Luxury Properties Ltd | Construction | 2025 |
| Fleur Cowgill Artist Ltd | Administrative & support | 2018 |
| Fleur Telecom Limited | Information & communication | 2014 |
| Fleurs Limited | Wholesale & retail | 2000 |
| Flexible Group Ltd | Information & communication | 2020 |
| Flip Creative Limited | Professional & scientific | 2017 |
| Flitecrew Trampoline & Cheer Club Ltd | Education | 2016 |
| Fliteware Limited | Information & communication | 2003 |
| Flo's Café Ltd | Real estate | 2020 |
| Flo's Restaurant Group Limited | Hospitality | 2026 |
| Floodgate Industries Limited | Extraterritorial | 2025 |
| Flookbook Limited | Information & communication | 2021 |
| Floop Health Limited | Information & communication | 2017 |
| Floral Park Properties Limited | Financial services | 2020 |
| Florian Gatwick Transfers Limited | Transport & logistics | 2025 |
| Flowfield Ltd | Professional & scientific | 2026 |
| Flowrite Drainage Services Limited | Professional & scientific | 1998 |
| FM Holdings & Investments Limited | Real estate | 2026 |
| Fm-People Ltd | Administrative & support | 2011 |
| Fmcp Limited | Professional & scientific | 2007 |
| Focus Consulting Holdings Limited | Financial services | 2024 |
| Focus Trading and Contracting Company Ltd | Construction | 2026 |
| Fone and Cases Limited | Wholesale & retail | 2022 |
| Food Catering (NU Sun) Co., Ltd. | Wholesale & retail | 2023 |
| Foodservice Packaging Association | Other services | 2006 |
| Foodtech Services (UK) Limited | Manufacturing | 2007 |
| Foord Tax Services Limited | Professional & scientific | 2003 |
| Footwork Management Limited | Administrative & support | 2019 |
| Footwork Sports Ltd | Professional & scientific | 2023 |
| FOR Sure Supplies Limited | Wholesale & retail | 2019 |
| Force Services Group Limited | Construction | 2026 |
| Ford Property Development Limited | Construction | 2015 |
| Fordox AI Ltd | Information & communication | 2026 |
| Forest Green Projects Limited | Professional & scientific | 2014 |
| Forest Wood Imports Ltd | Wholesale & retail | 2018 |
| Forever & Always Photography Limited | Extraterritorial | 2021 |
| Forever Flames Limited | Wholesale & retail | 2023 |
| Forge Aviation Business Consultancy Ltd | Professional & scientific | 2023 |
| Forge Group Advisory Ltd | Administrative & support | 2025 |
| Forge Mobility Services Limited | Transport & logistics | 2012 |
| Forge Tech Group Ltd | Information & communication | 2025 |
| Forgotten MEN Films Limited | Information & communication | 2015 |
| Fork Most Limited | Manufacturing | 1974 |
| Form Health & Wellness Ltd | Arts & recreation | 2023 |
| Format Games Limited | Manufacturing | 2019 |
| Formidable Hands Limited | Transport & logistics | 2012 |
| Formley Properties Limited | Real estate | 2012 |
| Formål Project Management Limited | Construction | 2023 |
| Formål Property Construction Limited | Construction | 2017 |
| Formål Property Developments Ltd | Construction | 2009 |
| Formål Property Group Ltd | Financial services | 2009 |
| Fortuna’S House Ltd | Real estate | 2024 |
| Forward Launch Limited | Information & communication | 2016 |
| Forward Look Consulting Ltd | Professional & scientific | 2021 |
| Forza Cloud Limited | Information & communication | 2021 |
| Forza Doors Ltd | Manufacturing | 2009 |
| Foster Homes Limited | Real estate | 2013 |
| Found Things UK Ltd | Wholesale & retail | 2022 |
| Foundations Living Network CIC | Real estate | 2025 |
| Foundry Court Management (Horsham) Limited | Real estate | 2005 |
| Fountain Control Solutions Limited | Extraterritorial | 2015 |
| Fountain Place (Horsham) Management Limited | Households | 2017 |
| Four Hill House Ltd | Information & communication | 2011 |
| Four Mazenod Avenue Ltd | Extraterritorial | 2015 |
| Fourth Platform Limited | Extraterritorial | 2019 |
| Fowler Building Contractors Limited | Construction | 1999 |
| Fowler Swimming Pools Limited | Construction | 1998 |
| Fowlers Lettings Limited | Real estate | 2010 |
| FOX Global Partners Ltd | Professional & scientific | 2017 |
| FOX Hill Associates Ltd | Professional & scientific | 2026 |
| FOX Rigging Ltd | Information & communication | 2025 |
| Foxbridge Estates Limited | Construction | 2020 |
| Foxfield FM Ltd | Real estate | 2019 |
| Foxfield Property Ltd | Real estate | 2018 |
| Foxleigh Grange Freehold Management Company Limited | Households | 2016 |
| Foxwood Management (Kingsfold) Limited | Households | 2001 |
| Fragomatrix Ltd | Manufacturing | 2026 |
| Framco Limited | Manufacturing | 2020 |
| Fran the Chirovet Ltd | Professional & scientific | 2021 |
| France Soir International Limited | Information & communication | 2005 |
| Francis & Co. Holdings Ltd | Real estate | 2026 |
| Francis Engineering Ltd | Wholesale & retail | 2025 |
| Francis Property & Lettings Limited | Real estate | 2023 |
| Francis Rhys Associates Ltd | Professional & scientific | 2015 |
| Frando Holdings Ltd | Hospitality | 2025 |
| Frank ST. Arthur Limited | Real estate | 2022 |
| Franklin Allen Associates Limited | Professional & scientific | 2009 |