| Fokkus Ltd | Professional & scientific | 2016 |
| Foleja Cafe Ltd | Hospitality | 2023 |
| Folio Wills Ltd | Professional & scientific | 2007 |
| FOLIO400 Limited | Arts & recreation | 2020 |
| Folk Dance Remixed CIC | Arts & recreation | 2026 |
| Fontana Moving Limited | Transport & logistics | 2004 |
| Fonte Capital Limited | Financial services | 2008 |
| Food & Health Foods Consultancy Ltd | Professional & scientific | 2022 |
| Food Stuff Limited | Professional & scientific | 2005 |
| Foodonist Ltd | Wholesale & retail | 2025 |
| Foot Deal Ltd | Administrative & support | 2025 |
| Football FUN Factory (Community 037) Ltd | Arts & recreation | 2021 |
| FOR the Love of Britain Ltd | Wholesale & retail | 2024 |
| Force 26 Ltd | Transport & logistics | 2026 |
| Fordwych 106 (Flats) Limited | Real estate | 2015 |
| Fordy Ltd | Wholesale & retail | 2025 |
| Fore Golf Ltd | Arts & recreation | 2025 |
| Forefront Utilities Limited | Construction | 1996 |
| Foreman & Associates Limited | Professional & scientific | 2002 |
| Foreman Media LLP | | 2003 |
| Foreminds Limited | Information & communication | 2009 |
| Foresight Capital Limited | Real estate | 2020 |
| Foresight Education Limited | Information & communication | 2013 |
| Foresight Project Control Ltd | Extraterritorial | 2013 |
| Foresite Property Limited | Real estate | 2016 |
| Forest Creative Limited | Information & communication | 2017 |
| Forestrall (Medway) Limited | Manufacturing | 2015 |
| Forestry First Limited | Agriculture & fishing | 2012 |
| Forever Green Lawns Limited | Administrative & support | 2007 |
| Forever Holdco Ltd | Financial services | 2026 |
| Forever Padel Ltd | Arts & recreation | 2026 |
| Forged Supplements Ltd | Wholesale & retail | 2026 |
| Forklift Training Services (Kent) Limited | Extraterritorial | 2013 |
| Forma Architecture Ltd | Professional & scientific | 2024 |
| Formby Management Limited | Professional & scientific | 2019 |
| Forme Property Services Limited | Real estate | 2016 |
| Formosa Amenity Limited | Households | 1981 |
| Formostar UK Limited | Wholesale & retail | 2018 |
| Forsa Associates Ltd | Professional & scientific | 2015 |
| Forstal Associates Ltd | Information & communication | 2014 |
| Fort Bridgewoods Development Company | | 1990 |
| Fortolo Limited | Professional & scientific | 2018 |
| Forum Developments Limited | Construction | 2006 |
| FOS Skateboards Limited | Arts & recreation | 2003 |
| Fosbury Capital Limited | Professional & scientific | 2012 |
| Foster & Mcdonald Ltd | Real estate | 2020 |
| Foster Care Solutions Limited | Administrative & support | 2010 |
| Fostering Families Ltd | Public administration | 2021 |
| Fostering Options Ltd | Health & social care | 2002 |
| Foton Compact Tractor Company Limited | Wholesale & retail | 2008 |
| Foton UK Limited | Wholesale & retail | 2008 |
| Fountainhead Consulting Limited | Professional & scientific | 2017 |
| Four Daughters Vineyard Limited | Agriculture & fishing | 2025 |
| Four M Property's Ltd | Real estate | 2020 |
| Four Pillars Property Holdings Ltd | Hospitality | 2026 |
| Four Squares Investments Limited | Financial services | 2019 |
| Four the Love of Photography Limited | Professional & scientific | 2024 |
| Fowlers Group Ltd | Wholesale & retail | 2025 |
| FOX Entrepreneur Academy Limited | Administrative & support | 2019 |
| FOX Lightning Protection Ltd | Construction | 2019 |
| FOX Red Media Limited | Information & communication | 2017 |
| FOX the Teacher Limited | Professional & scientific | 2020 |
| Foxhole Spirits Limited | Manufacturing | 2016 |
| Foxtrot Sales Ltd | Professional & scientific | 2024 |
| Foxtrot Sales Ltd Ltd | Professional & scientific | 2026 |
| Foxwood Design Limited | Financial services | 2005 |
| FP Tools Holdings Limited | Financial services | 2019 |
| Frais Ltd | Wholesale & retail | 2022 |
| Franchi Group Limited | Professional & scientific | 2024 |
| Francis Green Limited | Real estate | 1978 |
| Francisco Javier Lighting Limited | Wholesale & retail | 2025 |
| Franfind Limited | Professional & scientific | 1997 |
| Frank-Jully Limited | Construction | 2025 |
| Frankfloss Foundation | Administrative & support | 2014 |
| Franklin Mechanical Services Limited | Professional & scientific | 2019 |
| Frankmarquess Ltd | Professional & scientific | 2024 |
| Franko Couriers Limited | Transport & logistics | 2017 |
| Frant Road Clinic Ltd | Health & social care | 2000 |
| Frasers Quality Wholesale Meats Ltd | Wholesale & retail | 2002 |
| Frater Developments Limited | Administrative & support | 2014 |
| Freckle & Hyde Limited | Extraterritorial | 2011 |
| Fredellen Construction Limited | Professional & scientific | 2015 |
| Free Accomm Limited | Wholesale & retail | 2020 |
| Free Car Check Ltd | Other services | 2019 |
| Freedom Beauty Truth Love Ltd | Wholesale & retail | 2024 |
| Freehold of Flats at Dunes RD Greatstone Ltd | Households | 2024 |
| Freeman RE (UK) Ltd | Real estate | 2026 |
| Freer Farm Holdings Limited | Financial services | 2019 |
| Freestyle Interactive Limited | Information & communication | 2000 |
| Fremas Hair Lounge Ltd | Other services | 2025 |
| French Roofing Supplies Limited | Administrative & support | 2017 |
| Fresh AFG Juice Limited | Manufacturing | 2023 |
| Fresh Cleaning & Care Limited | Administrative & support | 2021 |
| Freshcuisine Holdings Limited | Other services | 2017 |
| Freshwood Estates Limited | Real estate | 2014 |
| Freshwood Properties (Kent) Limited | Hospitality | 2015 |
| Freshwood Properties Limited | Real estate | 2015 |
| Friendly Piranha Entertainment Ltd | Arts & recreation | 2015 |
| Friendly Piranha Events Ltd | Arts & recreation | 2015 |
| Friends Consultancy Limited | Professional & scientific | 2023 |