| Flomb Limited | Construction | 2020 |
| Floors & Decks UK Ltd | Construction | 2018 |
| Flora Products Ltd | Wholesale & retail | 2020 |
| Floral Decorativa UK Limited | Wholesale & retail | 2025 |
| Floraria Marius Ltd | Wholesale & retail | 2019 |
| Florbs Limited | Information & communication | 2025 |
| Florence Investments LLP | | 2024 |
| Florence Management Limited | Administrative & support | 2016 |
| Florentin Nica Limited | Construction | 2015 |
| Florida Studios Freehold Limited | Real estate | 2016 |
| Florida Studios RTM Company Limited | Households | 2011 |
| Florin Puravu Ltd | Construction | 2015 |
| Floris Trans Ltd | Transport & logistics | 2025 |
| Florosite Limited | Wholesale & retail | 2025 |
| Floryan Ltd | Extraterritorial | 2014 |
| Flourish & FLY Limited | Transport & logistics | 2023 |
| Flourish Inc Ltd | Professional & scientific | 2012 |
| Flow Deals Ltd | Wholesale & retail | 2025 |
| Flowergel Limited | Other services | 2019 |
| Flowers by ZOE (Hayes) Ltd | Wholesale & retail | 2019 |
| Flowers for Funerals Ltd | Wholesale & retail | 2015 |
| Flowers Group Ltd | Real estate | 2023 |
| Flowers Lounge Ltd | Hospitality | 2023 |
| Flowersquare (UK) Ltd | Wholesale & retail | 2000 |
| FLP Global Estate Ltd | Real estate | 2025 |
| Flux London Property Limited | Real estate | 2015 |
| Flux Promo Limited | Professional & scientific | 2012 |
| FLY Akshi Limited | Transport & logistics | 2018 |
| FLY Worldwide Ltd | Administrative & support | 2019 |
| Flyfir Limited | Wholesale & retail | 2015 |
| Flying Dove Group Limited | Transport & logistics | 2021 |
| Flying Eagle Estates Ltd | Real estate | 2025 |
| Flying Start Nurseries Limited | Professional & scientific | 1995 |
| Flytel Limited | Extraterritorial | 2005 |
| Flywheelz Limited | Other services | 2015 |
| Flyzo Ltd | Administrative & support | 2025 |
| FM Building Ltd | Construction | 2015 |
| FM Traders Limited | Administrative & support | 2013 |
| FM Ventures Ltd | Wholesale & retail | 2024 |
| FMA Medical Services Limited | Health & social care | 2023 |
| FMB Cars Limited | Transport & logistics | 2025 |
| FMC Cleaning Services UK Limited | Administrative & support | 2025 |
| FMC Developments Ltd | Administrative & support | 2013 |
| FMC UK Properties Limited | Real estate | 2021 |
| Fmcare Limited | Health & social care | 2020 |
| FMG Social CIC | Health & social care | 2016 |
| FMP International Ltd | Professional & scientific | 2012 |
| FMS Bookkeeping Ltd | Professional & scientific | 2023 |
| FN Homes Limited | Real estate | 2023 |
| Fnfuk Ltd | Wholesale & retail | 2010 |
| Fnghztrade Limited | Wholesale & retail | 2020 |
| FNJ Group Ltd | Real estate | 2021 |
| FNS Global Limited | Wholesale & retail | 2019 |
| FNS London Ltd | Real estate | 2021 |
| FNW Trading Ltd | Administrative & support | 2023 |
| FO Services Group Ltd | Construction | 2025 |
| Focal Construction Limited | Construction | 2018 |
| Focus Audit & Tax Accountants Ltd | Professional & scientific | 2013 |
| Focus Customs Clearing House Agents Limited | Transport & logistics | 2024 |
| Focus Interpreting & Translation Services Ltd | Professional & scientific | 2010 |
| Focus Recruitment Consultants Ltd | Administrative & support | 2025 |
| Focus Somar Audit & Tax Accountants Ltd | Professional & scientific | 2019 |
| Focus-Net Technologies Ltd | Information & communication | 2017 |
| Fojiro Properties & Investments Limited | Real estate | 2024 |
| Foley Haulage Limited | Transport & logistics | 2007 |
| Followers Limited | Administrative & support | 2024 |
| Folly Architects Limited | Professional & scientific | 2024 |
| Fomonsur Management Ltd | Financial services | 2016 |
| Fone 4 Accessories & Vape Ltd | Wholesale & retail | 2026 |
| Foneshop (Southall) Limited | Wholesale & retail | 2021 |
| Fonewala Ltd | Wholesale & retail | 2026 |
| Fontana Solutions Limited | Mining & quarrying | 2000 |
| Food and Drink Distribution Ltd | Wholesale & retail | 2024 |
| Food Around the World Limited | Hospitality | 2025 |
| Food Craze Ltd | Hospitality | 2025 |
| Food Emporium Ltd | Hospitality | 2023 |
| Food Safety Guru Ltd | Extraterritorial | 2016 |
| Food Taxi Ltd | Transport & logistics | 2019 |
| Food Ventures Limited | Wholesale & retail | 2025 |
| Foodfads Limited | Wholesale & retail | 2014 |
| Foodie Patels Limited | Hospitality | 2025 |
| Foodiyl UK Limited | Wholesale & retail | 2025 |
| Foodm Ltd | Hospitality | 2026 |
| Foolish Monk Productions Limited | Information & communication | 2012 |
| Foot World Limited | Wholesale & retail | 2011 |
| Footballgallery Ltd | Information & communication | 2026 |
| Footwork Media Limited | Information & communication | 2021 |
| FOR the Love of Pictures Limited | Information & communication | 2025 |
| Foran Services Ltd | Construction | 2021 |
| Forbes Eyecare Limited | Wholesale & retail | 1984 |
| Forbes RIX Design Limited | Manufacturing | 2011 |
| Force Nexus Woodslane Ltd | Real estate | 2018 |
| Forces Uniforms Limited | Wholesale & retail | 2019 |
| Fordham & Partners Ltd | Real estate | 2013 |
| Fordham Partnership Limited | Professional & scientific | 2020 |
| Fordmill Estates Ltd | Real estate | 2014 |
| Fordover Services Limited | Real estate | 1987 |
| Fordshire Limited | Construction | 2022 |
| Fordwych Investments Limited | Real estate | 2021 |
| Fore Street Brixham Limited | Real estate | 2026 |