| Four Guys Limited | Manufacturing | 2017 |
| Four Oaks Capital Ltd | Financial services | 2025 |
| Four Oaks Property Limited | Real estate | 2026 |
| Four Seasons Management (NO 2) Limited | Professional & scientific | 1992 |
| Four Seasons Management (NO.1) Limited | Households | 1990 |
| Four Seasons Management (NO.3) Limited | Households | 1992 |
| Four Two Music Limited | Information & communication | 2012 |
| Four Wheel Draught Ltd | Hospitality | 2024 |
| Fourfour Group Ltd | Financial services | 2021 |
| Fourth Roman Property Trust Limited | Real estate | 1988 |
| Fourth Wall Bookshop Ltd | Wholesale & retail | 2026 |
| Fowler Hall Limited | Professional & scientific | 2003 |
| Fowles Fencing Ltd | Construction | 2026 |
| FOX and Fortune Tattoo Limited | Professional & scientific | 2020 |
| FOX Coaching Programmes Limited | Professional & scientific | 2012 |
| FOX Eyes Imaging Ltd | Professional & scientific | 2025 |
| Foxglove Food Ltd | Hospitality | 2024 |
| Foxwell Catering Group Ltd | Hospitality | 2019 |
| Foynes Holdings Limited | Financial services | 2025 |
| Fractional Recruitment Limited | Administrative & support | 2025 |
| Fracture Studios Limited | Professional & scientific | 2021 |
| Fragile Continuum Ltd | Information & communication | 2022 |
| Francini Cafe DE Colombia Ltd | Hospitality | 2019 |
| Franco Barone Limited | Real estate | 2018 |
| Frank Franks Ltd | Hospitality | 2024 |
| Frankie and LEO Ltd | Financial services | 2017 |
| Frankie Lowe Limited | Professional & scientific | 2026 |
| Fraser and Fraser Limited | Professional & scientific | 2018 |
| Frederick Street Management Limited | Households | 2026 |
| Free Farrow Ltd. | Wholesale & retail | 2010 |
| FREEAGENT247.COM Ltd | Real estate | 2017 |
| Freeheart Holdings Ltd | Information & communication | 2020 |
| Freemans Holdings Ltd | Agriculture & fishing | 2022 |
| Freeway Resources Ltd | Professional & scientific | 2011 |
| Frenergy Limited | Professional & scientific | 2019 |
| Fresh Impact Limited | Wholesale & retail | 1999 |
| Fresh Nous Limited | Professional & scientific | 2014 |
| Fresh Perspective Videography Ltd | Professional & scientific | 2024 |
| Fresh PR Limited | Professional & scientific | 2019 |
| Fresh Public Relations Limited | Administrative & support | 2008 |
| Fresh Scientific Solutions Ltd | Professional & scientific | 2020 |
| Fresh Source Digital Limited | Professional & scientific | 2015 |
| Fresh Transformations Limited | Construction | 2019 |
| Freshseal Limited | Manufacturing | 2000 |
| FRF Pubs Limited | Hospitality | 2023 |
| Friar Street Bar Limited | Hospitality | 2020 |
| Friars Oak Limited | Information & communication | 2019 |
| Friend Solutions Ltd | Administrative & support | 2022 |
| Friendly Publishing Limited | Professional & scientific | 2005 |
| Friendly Showing Ltd | Arts & recreation | 2026 |
| Friends Asian Supermarket Ltd | Wholesale & retail | 2017 |
| Friendsoftheriversevern | Agriculture & fishing | 2023 |
| Friern Property Investments Limited | Real estate | 2018 |
| Frika Sells Limited | Wholesale & retail | 2024 |
| Frisky FOX Creations Limited | Arts & recreation | 2023 |
| Frith Limited | Administrative & support | 2019 |
| Frog Lets Ltd | Real estate | 2025 |
| From the Glass JAR Ltd | Wholesale & retail | 2021 |
| Frome Valley Toymakers Limited | Manufacturing | 2003 |
| Front ROW Ventures Limited | Professional & scientific | 2011 |
| Frontier Infrastructure Limited | Financial services | 2012 |
| Frontline Transitioning Ltd. | Health & social care | 2015 |
| Frontlinexp Limited | Information & communication | 2025 |
| Frontsouth (Developments) Limited | Construction | 2006 |
| Frost CW Ltd | Real estate | 2024 |
| Froude Engineering Limited | Manufacturing | 2016 |
| Froude Group Ltd | Financial services | 2016 |
| Froude Limited | Manufacturing | 2016 |
| Fruitful Accounting Holdings Limited | Wholesale & retail | 2018 |
| Frumenty Ltd | Hospitality | 2018 |
| FSI Properties Ltd | Real estate | 2025 |
| FTR Five Ltd | Real estate | 2023 |
| FTR Four Ltd | Real estate | 2023 |
| FTR Management Ltd | Administrative & support | 2023 |
| FTR One Ltd | Real estate | 2023 |
| FTR SIX Ltd | Real estate | 2023 |
| FTR Three Ltd | Real estate | 2023 |
| FTR Two Ltd | Real estate | 2023 |
| Fuel Clothing Ltd | Wholesale & retail | 2021 |
| Full Motion Comps Limited | Administrative & support | 2026 |
| Full Potential Digital Marketing Limited | Professional & scientific | 2017 |
| Full Send Properties Limited | Real estate | 2021 |
| Fullerfx Ltd | Financial services | 2024 |
| Fulwell Capital (London) Ltd | Real estate | 2018 |
| Fulwood Holdings Limited | Professional & scientific | 1981 |
| Fulwood Property Investments Limited | Construction | 1984 |
| Fulwood Supplies Limited | Wholesale & retail | 1990 |
| Funani Ltd | Wholesale & retail | 2025 |
| Functional Nutrition Formula Limited | Other services | 2014 |
| Funics Franchise Ltd | Administrative & support | 2022 |
| Funics Ltd | Education | 2019 |
| Furnace & Oven Technologies Limited | Manufacturing | 2001 |
| Furry Fades Dog Services Ltd | Other services | 2021 |
| Fury Blaze Limited | Wholesale & retail | 2024 |
| FUS Industrial Limited | Wholesale & retail | 2016 |
| FUS Racing Team Ltd | Wholesale & retail | 2025 |
| Fushiebridge Ltd | Health & social care | 2020 |
| Fusion Brasserie Ltd | Hospitality | 2004 |
| Fusion Foods Limited | Extraterritorial | 2001 |
| Fusion Plumbing and Heating Limited | Construction | 2011 |