| Fouracre Property Management Ltd | Real estate | 2022 |
| Fourarmed Cyber Ltd | Information & communication | 2024 |
| Fourfinns Ltd | Professional & scientific | 2002 |
| Fourkay Wearhouse Ltd | Wholesale & retail | 2025 |
| Fourleaf Studios Ltd | Information & communication | 2020 |
| Fourseasons Catering and Cleaning Limited | Hospitality | 2018 |
| Fourstone Property Ltd | Real estate | 2024 |
| Fourteen Cambridge Park Management Company Limited | Households | 1975 |
| Fourteen Sydenham Limited | Real estate | 1977 |
| Fourth Dimension Routing Ltd. | Construction | 2002 |
| Fourth Floor Creative Limited | Professional & scientific | 2017 |
| Fourth Floor Group Limited | Professional & scientific | 2020 |
| Fourth Wave Consulting LLP | | 2018 |
| Fourthnight Limited | Health & social care | 2018 |
| Fourum Properties Limited | Real estate | 2007 |
| Fourways (Sidmouth) Limited | Health & social care | 2005 |
| Fourways Care Limited | Health & social care | 2013 |
| Fourways Project Management Limited | Professional & scientific | 2013 |
| Foward Properties Limited | Construction | 2022 |
| Foward Thinking Ltd | Wholesale & retail | 2023 |
| Fowler & Ford Contracting Ltd | Construction | 2024 |
| Fowler and Moffatt Limited | Real estate | 2024 |
| Fowler Business Consulting Limited | Professional & scientific | 2015 |
| Fowler GAS Heating & Plumbing Limited | Construction | 2009 |
| Fowler's of Bristol (Engineers) Limited | Manufacturing | 1961 |
| Fowler's Property Management Ltd | Real estate | 2018 |
| Fowlers of Bristol Limited | Wholesale & retail | 1961 |
| Fowlers Retail Solutions Limited | Professional & scientific | 2023 |
| FOX & George Investments Limited | Real estate | 2020 |
| FOX & Rascal Property Innovations Ltd | Real estate | 2024 |
| FOX & West Limited | Wholesale & retail | 2017 |
| FOX Collective Communication Limited | Professional & scientific | 2018 |
| FOX Comms Limited | Construction | 2013 |
| FOX Cycling Franchising Ltd | Education | 2018 |
| FOX Cycling Limited | Arts & recreation | 2019 |
| FOX Davidson Ltd | Financial services | 2013 |
| FOX Fencing and Decking Ltd | Administrative & support | 2024 |
| FOX Food Holdings Limited | Real estate | 2022 |
| FOX House Brislington (Management) Limited | Households | 1982 |
| FOX Physiotherapy Ltd | Health & social care | 2025 |
| Fox&Fowweather Ltd | Wholesale & retail | 1999 |
| Fox-Clinch Property Ltd | Real estate | 2020 |
| Foxcotte Veterinary Clinics Limited | Extraterritorial | 2010 |
| Foxdown Building Ltd | Construction | 2019 |
| Foxes Mead Management Ltd | Households | 2016 |
| Foxfield Management Limited | Households | 1989 |
| Foxford Leisure Limited | Hospitality | 2001 |
| Foxglove Group Ltd | Construction | 2025 |
| Foxglove Vale Ltd | Extraterritorial | 2008 |
| Foxhills Investments Limited | Financial services | 2021 |
| Foxhills Racing Limited | Arts & recreation | 2020 |
| Foxie's Security Ltd | Extraterritorial | 2020 |
| Foxleigh Flats (Management) Limited | Households | 1992 |
| Foxley Solace Group Limited | Financial services | 2025 |
| Foxmain Associates Ltd | Professional & scientific | 2007 |
| Foxon & Foxon Limited | Manufacturing | 2015 |
| Foxon Finishers Limited | Manufacturing | 2005 |
| Foxrock Productions Ltd | Arts & recreation | 2014 |
| Foxrock Properties Limited | Real estate | 2026 |
| Foxton Budd Ltd | Administrative & support | 2018 |
| Foxtree Solutions Ltd | Professional & scientific | 2017 |
| Foxtrot Logistics Limited | Transport & logistics | 2020 |
| Foxwood Property Solutions Limited | Construction | 2026 |
| Fozzy Media Limited | Administrative & support | 2015 |
| FP Cardiff Limited | Arts & recreation | 2022 |
| FPB Management Ltd | Professional & scientific | 2023 |
| FPC (Bath) Ltd | Real estate | 2017 |
| FPC Sugarcraft Limited | Manufacturing | 2012 |
| Fpjones Limited | Administrative & support | 2025 |
| FPR Services Limited | Professional & scientific | 2025 |
| FR Management Ltd | Hospitality | 1995 |
| FR Vehicle One Ltd | Health & social care | 2023 |
| FR808DOM Ltd | Arts & recreation | 2020 |
| Frabrizim Maison Ltd | Real estate | 2024 |
| Fracteura Limited | Financial services | 2024 |
| Fractional FD Limited | Professional & scientific | 2025 |
| Fractional Finance Limited | Professional & scientific | 2022 |
| Fractional Human Resources Limited | Administrative & support | 2024 |
| Fractional Jobs Ltd | Information & communication | 2025 |
| Fractional Points Management Limited | Administrative & support | 2002 |
| Framatome Limited | Manufacturing | 2015 |
| Framatome UK Limited | Administrative & support | 2016 |
| Frame Living Limited | Real estate | 2026 |
| Framefit Limited | Construction | 2022 |
| Frameless Glass Innovations Ltd | Construction | 2025 |
| Frames of Reference Films Ltd | Information & communication | 1999 |
| Framework Power Ltd | Construction | 2024 |
| Frampton 1957 Limited | Extraterritorial | 2014 |
| Frampton Access Scaffolding Limited | Construction | 2024 |
| Frampton Compliance Limited | Construction | 2025 |
| Frampton END Consulting Limited | Professional & scientific | 2018 |
| Frampton Garage (South Glos) Ltd | Wholesale & retail | 2009 |
| Frampton Pharmacy Limited | Health & social care | 2007 |
| Frampton Roofing and Building Specialists Ltd | Construction | 2018 |
| Frams Associates (PM) Ltd | Professional & scientific | 2008 |
| France Aero Consultancy Ltd | Professional & scientific | 2023 |
| Francesca Marie Ltd | Wholesale & retail | 2016 |
| Francesco Italian Ltd | Hospitality | 2019 |
| Francesco Perra Ltd | Wholesale & retail | 2022 |
| Franchise Solutions Limited | Professional & scientific | 2001 |