| Fides Maintenance and Refurbishment Ltd | Construction | 2014 |
| Fiesole Consulting Limited | Administrative & support | 2014 |
| Fifteen Percent Ltd | Arts & recreation | 2025 |
| Fifth From the Sun Ltd | Hospitality | 2025 |
| Fighting Through 28 C.I.C. | Other services | 2025 |
| FIGURE8 Electrical Limited | Construction | 2025 |
| Fileadmin Holdings Limited | Real estate | 2002 |
| Financial Freedom Factory Ltd | Financial services | 2022 |
| Finbrel Ltd | Real estate | 2018 |
| Finch & Co. Clothing Ltd | Wholesale & retail | 2025 |
| Find My Mortgage Ltd | Professional & scientific | 2025 |
| Find-A-Skip Limited | Water & waste | 2011 |
| Fine Dining Southend Limited | Hospitality | 2017 |
| Fine Foods (GB) Ltd | Transport & logistics | 2002 |
| Finesse Performance Ltd. | Wholesale & retail | 2021 |
| Finishing Touches Corporation Ltd | Wholesale & retail | 2007 |
| Finn House Airspace Limited | Real estate | 2022 |
| Finnovation Advisors UK Ltd | Professional & scientific | 2018 |
| Finny Business Limited | Administrative & support | 2021 |
| FINSMART360 Limited | Information & communication | 2025 |
| Fire & Flame 19 Ltd | Hospitality | 2024 |
| Fire Suppression Southern Limited | Wholesale & retail | 2007 |
| Fireplace and Sweeping Services Ltd | Administrative & support | 2024 |
| Firexx Limited | Construction | 1995 |
| First Choice Executive Ltd | Transport & logistics | 2024 |
| First Class Carpentry Ltd | Construction | 2021 |
| First Design Solution Ltd | Professional & scientific | 2016 |
| First Point 24 Ltd | Health & social care | 2017 |
| Fish Food Ltd | Hospitality | 2021 |
| Fitlife Essex Ltd | Arts & recreation | 2024 |
| Fitnfab Limited | Arts & recreation | 2017 |
| Fitter 4 ALL Limited | Professional & scientific | 2015 |
| Fitzcsparks Ltd | Construction | 2018 |
| Five Bells Streatery Limited | Hospitality | 2024 |
| Five PAR Golf Ltd | Construction | 2025 |
| Five Seasons Ltd | Professional & scientific | 2013 |
| FJH Service Solutions Limited | Administrative & support | 2025 |
| FJK Solutions Limited | Professional & scientific | 2025 |
| FJS1 Detail Ltd | Wholesale & retail | 2023 |
| FL Telecoms Limited | Manufacturing | 2012 |
| Flandi Ltd | Wholesale & retail | 2025 |
| Flash CY Properties Ltd | Real estate | 2026 |
| Fleekangel Laser Ltd | Other services | 2024 |
| Fleet Clothing UK Limited | Manufacturing | 2025 |
| Fleet Fashion Clothing UK Ltd | Information & communication | 2024 |
| Flevi Limited | Real estate | 2022 |
| Flexishift Nannies Ltd | Administrative & support | 2025 |
| Flint Climate Solutions Ltd | Construction | 2025 |
| FLO Marketing & Design Ltd | Administrative & support | 2025 |
| Flooring Construction Limited | Construction | 2019 |
| Floorplan Plumbing & GAS Engineering Ltd | Construction | 2025 |
| Floral Greeting Cards Ltd | Manufacturing | 2021 |
| Florrie FI Limited | Real estate | 2026 |
| Flowfix Central Limited | Construction | 2025 |
| Flowfix South East Limited | Construction | 2025 |
| Flowkyra Ltd | Information & communication | 2025 |
| Flowtec Air Conditioning Ltd | Construction | 2017 |
| Flud Digital Ltd. | Other services | 2017 |
| Flush Building Services Limited | Construction | 2013 |
| Flush Group Limited | Construction | 2019 |
| Flux Computing Ltd | Information & communication | 2021 |
| FLY Accumulation Media & PR Ltd | Professional & scientific | 2021 |
| Flying Lime Media Ltd | Information & communication | 2014 |
| Flynne Plant Training Services Limited | Administrative & support | 2017 |
| FMS Trading Limited | Wholesale & retail | 2024 |
| FNB Property Limited | Real estate | 2026 |
| Focus Westcliff Limited | Health & social care | 2022 |
| Fogarty Solutions Ltd | Professional & scientific | 2025 |
| Folan Technologies Ltd | Manufacturing | 2021 |
| Food Roots Ltd | Hospitality | 2026 |
| Foodiefoursisters Ltd | Hospitality | 2024 |
| Foot and Tooth Medical Ltd | Health & social care | 2026 |
| Forbidden FUN Ltd | Wholesale & retail | 2026 |
| Ford & Co Financial Planning Ltd | Financial services | 2017 |
| Formara Limited | Manufacturing | 1973 |
| Forming Pro Ltd | Construction | 2024 |
| Forte Action Ltd | Arts & recreation | 2024 |
| Forte Safety Solutions Ltd | Public administration | 2024 |
| Four Four One Ltd | Real estate | 2020 |
| Four Pillars Holdings Limited | Financial services | 2025 |
| Four Seasons Exterior Wallcoatings Limited | Construction | 2007 |
| FOX & Fairy Talent Ltd | Administrative & support | 2025 |
| FOX Bay Properties Ltd | Real estate | 2025 |
| FOX Private Travel Ltd | Administrative & support | 2023 |
| Foxglove Hollow (NO. 2) Limited | Households | 2001 |
| Foxhie Ltd | Health & social care | 2022 |
| Fozard Services Limited | Real estate | 1999 |
| France Skiing Limited | Administrative & support | 2011 |
| Franklin Property Group Ltd | Real estate | 2020 |
| Frankly Interpreting Limited | Administrative & support | 2017 |
| Frays Property Management (NO.3) Limited | Construction | 2000 |
| Fred & Rodda Limited | Wholesale & retail | 2003 |
| Freedom Fintech Ltd | Information & communication | 2025 |
| Freedom Lifts Ltd | Wholesale & retail | 2026 |
| Freedomsq Ltd | Professional & scientific | 2025 |
| Freehold Properties SW Limited | Real estate | 2021 |
| Freehold Services Limited | Real estate | 2005 |
| FREEHOLD14 Limited | Households | 2017 |
| Freezon.Com Limited | Wholesale & retail | 2019 |
| Freight and Commodity Talent Ltd | Administrative & support | 2021 |