| F2F Systems Ltd | Water & waste | 2026 |
| Fable Kitchens Limited | Wholesale & retail | 2019 |
| Factmeek Limited | Professional & scientific | 1983 |
| Factorial Tuition Limited | Education | 2025 |
| Fairholm Limited | Construction | 2009 |
| Fairlight Works Limited | Information & communication | 2015 |
| Fairminds Solutions Ltd | Administrative & support | 2025 |
| Fairrard Wealth Limited | Administrative & support | 2021 |
| Fairwater Van Sales Ltd | Wholesale & retail | 2020 |
| Fairway Rise Management Company Limited | Households | 1982 |
| Falcon Close Management Company Limited | Households | 2018 |
| Falcon Court (Taunton) Management Company Limited | Households | 1990 |
| Falcon Fire & Mechanical Limited | Construction | 2013 |
| Falcon Vehicle Solutions Limited | Administrative & support | 1990 |
| Family Timeline Ltd | Information & communication | 2020 |
| Famous Makers Limited | Extraterritorial | 2018 |
| Fantasy Lights Limited | Wholesale & retail | 1989 |
| Faraway Estates Limited | Professional & scientific | 2024 |
| Farmacy Group Ltd | Extraterritorial | 2018 |
| Farrell Decor Ltd | Construction | 2025 |
| Farringdon Barns Management Company Limited | Households | 2009 |
| Farson Digital Limited | Professional & scientific | 2012 |
| Farthing Place Management Company (NO. 3) Limited | Households | 2004 |
| Farthings Hotel Limited | Hospitality | 2006 |
| Farwood Barton Partnership Ltd | Agriculture & fishing | 2016 |
| Fashionunited Benelux Ltd. | Financial services | 2008 |
| Fashionunited World Wide Ltd | Professional & scientific | 2007 |
| Fastrelocation Ltd | Real estate | 2019 |
| Fawlty Holdings Limited | Hospitality | 2016 |
| FDB Limited | Construction | 2015 |
| FDI Scan Limited | Information & communication | 2010 |
| Fear & Hawkins Limited | Real estate | 1998 |
| Fear & Plummer Carpenters Limited | Construction | 2006 |
| Feedco Ltd | Manufacturing | 2015 |
| Feejee Mermaid Ltd | Hospitality | 2021 |
| Felictas Home Care Ltd | Health & social care | 2023 |
| Femigof Limited | Wholesale & retail | 2024 |
| Femtovet Holdings Ltd | Financial services | 2026 |
| Fenestra Glazing Ltd | Construction | 2017 |
| Ferguson Veterinary Clinic and Orthopaedic Referrals Limited | Professional & scientific | 2022 |
| Fern Construction SW Limited | Construction | 2024 |
| Fewings Farming Ltd | Agriculture & fishing | 2018 |
| FF Agriculture Ltd | Agriculture & fishing | 2012 |
| FFI Consulting Limited | Real estate | 2021 |
| Fibredry Ltd | Other services | 2017 |
| Fibrepac Limited | Administrative & support | 2022 |
| Fideoak Management Company Limited | Real estate | 2013 |
| Fieldfare Books Ltd | Wholesale & retail | 2015 |
| Fieldhouse Engineering Ltd | Professional & scientific | 2019 |
| Fielding Property Holdings Limited | Real estate | 2025 |
| Fiesta Holdings Limited | Professional & scientific | 2002 |
| Fiesta Studios Limited | Extraterritorial | 2026 |
| Filbert Splosh Limited | Education | 2002 |
| Filberts Fine Foods Limited | Manufacturing | 2009 |
| Filiae Limited | Real estate | 1997 |
| Fillingham Electrical Limited | Construction | 2002 |
| Financia Credit Versatec-Fintech (UK) Ltd | Financial services | 2024 |
| Financial Planning for Professionals Limited | Financial services | 2009 |
| Financiera Suma (UK) Limited | Administrative & support | 2017 |
| Fincontrol Ltd | Professional & scientific | 2022 |
| Find Your Wings Ltd | Education | 2025 |
| Fine Woodwork Limited | Construction | 2012 |
| Finesse Property Investments Ltd | Real estate | 2023 |
| Finexl Limited | Financial services | 2019 |
| Finnli Holding Ltd. | Professional & scientific | 2009 |
| Fintech Commercial Services Limited | Professional & scientific | 2023 |
| Fiona Toms Consulting Limited | Professional & scientific | 2009 |
| Fire Safety Consultancy & Training Ltd | Professional & scientific | 2021 |
| Firepool Lock (Taunton) Management Company Limited | Households | 2013 |
| Firepool Lock Development Ltd | Construction | 2016 |
| Fireship Media Limited | Information & communication | 2018 |
| Firestarter 1616 Ltd | Construction | 2022 |
| Firsland Farm Limited | Other services | 2011 |
| First Chapter Consultancy (Taunton) Limited | Professional & scientific | 2012 |
| First Graphic Communications Limited | Manufacturing | 2012 |
| First Line Response Limited | Administrative & support | 2004 |
| First Option Venues Limited | Administrative & support | 2012 |
| First South West Limited | Transport & logistics | 1982 |
| Firstcall 247 Cheltenham Ltd | Administrative & support | 2024 |
| Firstcall Photographic Limited | Professional & scientific | 1991 |
| Firwood Poultry Limited | Agriculture & fishing | 2009 |
| Fisher & Company Engineering Services Limited | Manufacturing | 2006 |
| Fitzgerald Solutions Ltd | Extraterritorial | 2019 |
| Fitzpen Ltd | Real estate | 2019 |
| Fitzsimons Property Ltd | Real estate | 2015 |
| Five Acres Dog Field Ltd | Other services | 2025 |
| Fivecurrents Ltd | Information & communication | 2009 |
| Fiveoak Boarding Cattery Ltd | Other services | 2024 |
| Fiveways Magazine Ltd | Manufacturing | 2018 |
| Fizz U.K. Limited | Hospitality | 1997 |
| Fizzy Whizzy's Toys Ltd | Wholesale & retail | 2025 |
| Fizzywhizzywoo Ltd | Hospitality | 2018 |
| FKK Enterprise Ltd | Professional & scientific | 2024 |
| Flank Surf Exploration Ltd | Manufacturing | 2022 |
| Flashback Media Limited | Wholesale & retail | 2026 |
| Flatts Care Services Ltd | Health & social care | 2019 |
| FLC Holdings Ltd | Financial services | 2021 |
| Fleetvend Ltd | Information & communication | 2026 |
| Flett Accounting Services Ltd | Professional & scientific | 2014 |
| Flight Path Productions Ltd | Information & communication | 2021 |