| Fmcg Trading Ltd | Wholesale & retail | 2019 |
| Fmej Ltd | Real estate | 2024 |
| FMO Construction Ltd | Construction | 2021 |
| FMO Property Ltd | Real estate | 2020 |
| FMQ Properties Limited | Real estate | 2022 |
| FMR Autos Limited | Wholesale & retail | 2024 |
| FNC Network Ltd | Transport & logistics | 2020 |
| Fnord Enterprises Ltd | Real estate | 2022 |
| Foarfeca Ltd | Transport & logistics | 2022 |
| Focal Image Limited | Professional & scientific | 1988 |
| Focal Point Estates LLP | | 2009 |
| Focus Construction Management Limited | Administrative & support | 2010 |
| Focus Enterprise Management Limited | Professional & scientific | 1990 |
| Focus Group of Companies Limited | Wholesale & retail | 2020 |
| Foden Health Care & Fitness Ltd | Professional & scientific | 1999 |
| Foggi Car Parts Ltd | Wholesale & retail | 2025 |
| Fokas Catering Services Limited | Hospitality | 2021 |
| Fola Decor Ltd | Professional & scientific | 2025 |
| Folan Moussoro Joubert Ltd | Financial services | 2019 |
| Folarin Ogunbanjo Limited | Health & social care | 2015 |
| Foley Exhibitions Limited | Manufacturing | 1996 |
| Foley Worldwide Exhibitions Limited | Construction | 2022 |
| Foleys Landscapes Ltd | Administrative & support | 2025 |
| Folkestone Kebab & Pizza Limited | Other services | 2016 |
| Fontblade Limited | Other services | 2020 |
| Fonthillbishop Ltd | Extraterritorial | 2008 |
| Food Microbiology Consultancy Limited | Professional & scientific | 2020 |
| Food Store Plus Ltd | Wholesale & retail | 2018 |
| FOOD4YOU Ltd | Hospitality | 2020 |
| Foodies for YOU Ltd | Hospitality | 2023 |
| Foodkind C.I.C. | Other services | 2016 |
| Foodrush Consultants Ltd | Hospitality | 2024 |
| Foot 2 Floor Ltd | Construction | 2022 |
| Footstep Training Limited | Education | 2012 |
| Footsteps Daycare 2018 Ltd | Education | 2018 |
| Footsteps Tours Limited | Extraterritorial | 2021 |
| FOR ALL Celebrations Limited | Wholesale & retail | 2016 |
| FOR Young Athletes CIC | Arts & recreation | 2024 |
| Fora Search Limited | Other services | 2020 |
| Fora Trading Ltd | Hospitality | 2019 |
| Foremans Tree Specialists Ltd | Administrative & support | 2018 |
| Foremost Concierge Ltd | Wholesale & retail | 2024 |
| Forepod Limited | Construction | 2009 |
| Foresight Trading Ltd | Wholesale & retail | 2022 |
| Forest Consulting Ltd | Professional & scientific | 2022 |
| Forest Gump Ltd | Agriculture & fishing | 2022 |
| Forest Heath Management Company Limited | Households | 2018 |
| Forest Lodge Enterprises Limited | Arts & recreation | 2011 |
| Forest Wood Studio Ltd | Professional & scientific | 2016 |
| Forestadent Future Ltd | Manufacturing | 2019 |
| FOREVER1130 Services Ltd | Health & social care | 2018 |
| Forex Million Capital Ltd | Education | 2019 |
| Forge Corporation Ltd | Wholesale & retail | 2024 |
| Forge Energy Ltd | Construction | 2024 |
| Forged Group Ltd | Administrative & support | 2024 |
| Forging Developments UK Limited | Manufacturing | 2006 |
| Forhak Fondation Ltd | Health & social care | 2024 |
| Forklift & Warehousing Ecommerce Ltd | Wholesale & retail | 2026 |
| Forklift & Warehousing Recruitment Ltd | Administrative & support | 2025 |
| Forklift & Warehousing Training Ltd | Education | 2025 |
| Forkmaster Ltd | Transport & logistics | 2016 |
| Forkmate Ltd | Information & communication | 2026 |
| Forks and Green Ltd | Hospitality | 2017 |
| Form Five Group Limited | Construction | 2021 |
| Formforce UK Limited | Extraterritorial | 2017 |
| Formpave Landscapes & Drives Limited | Construction | 2019 |
| Formpave Limited | Extraterritorial | 2016 |
| Forms and Surfaces (UK) Limited | Manufacturing | 1983 |
| Formuleshop Ltd | Wholesale & retail | 2026 |
| Forrest Commercial Cleaning Limited | Administrative & support | 2022 |
| Forrest Edge Ltd | Hospitality | 2025 |
| Forrest Fenn Consulting Limited | Professional & scientific | 2015 |
| Forte Nutrition Coaching Limited | Health & social care | 2025 |
| Forte Triathlon Limited | Arts & recreation | 2025 |
| Forterra Building Products Limited | Manufacturing | 2014 |
| Forterra Holdings Limited | Financial services | 2016 |
| Forterra PLC | Financial services | 2016 |
| Forthall Tea Company Ltd | Manufacturing | 2018 |
| Fortis Habitat Ltd | Real estate | 2026 |
| Fortivita Ltd | Wholesale & retail | 2024 |
| Fortress IT Services Limited | Information & communication | 2016 |
| Fortress Protection Services Limited | Administrative & support | 2025 |
| Fortress Shield Security & Surveillance Ltd | Real estate | 2024 |
| Fortune Assets Ltd | Wholesale & retail | 2021 |
| Fortune Cookie Supplies Limited | Hospitality | 2011 |
| Fortune Global Trading Ltd | Hospitality | 2024 |
| Fortune Healthcare Ltd | Health & social care | 2019 |
| Forward Security Limited | Administrative & support | 2012 |
| Forward Training Associates Limited | Education | 2013 |
| FOS BEE Cleaning Limited | Households | 2022 |
| Foster Business Insights Limited | Professional & scientific | 2021 |
| Foster Business Investments Limited | Professional & scientific | 2025 |
| Foster Development Projects Ltd | Construction | 2020 |
| Foundation Personnel Limited | Administrative & support | 2014 |
| Foundation Stone (UK) Limited | Real estate | 2008 |
| FOUNDED1961 Limited | Professional & scientific | 2017 |
| Foundry Gym Black Country Ltd | Arts & recreation | 2018 |
| Fountain Construction Limited | Construction | 2004 |
| Fountain Homes (UK) Ltd | Construction | 2013 |
| Fountains Healthcare Ltd | Health & social care | 2022 |