| Floreat Real Estate Limited | Professional & scientific | 2013 |
| Floreat Real Estate UK Recovery CIP LLP | | 2021 |
| Floreat Real Estate UK Recovery GP LLP | | 2021 |
| Floreat Real Estate UK Recovery LP | | 2021 |
| Floreat Wealth Management Limited | Professional & scientific | 2014 |
| Florian Gadsby Limited | Arts & recreation | 2021 |
| Florida Freeholds Limited | Administrative & support | 2022 |
| Florin Witall Ltd | Transport & logistics | 2018 |
| Flourish Cards Ltd | Information & communication | 2017 |
| Flovitae Ltd | Information & communication | 2024 |
| Flower Buds (Herts) Ltd | Professional & scientific | 2025 |
| Flower SLA Ltd | Wholesale & retail | 2021 |
| Flush & Flow Drainage Commercial Limited | Water & waste | 2023 |
| Fluxo IT Ltd | Information & communication | 2025 |
| Flycovr Ltd | Professional & scientific | 2020 |
| Flying Cameraman Ltd | Information & communication | 2019 |
| Flying Dragon Media Limited | Information & communication | 2013 |
| Flying V Films Ltd | Information & communication | 2010 |
| Flying Wolf Properties Ltd | Real estate | 2022 |
| Flynn Associates Ltd | Administrative & support | 2024 |
| Flywall Dryliners Ltd | Construction | 2021 |
| FM Estates Limited | Real estate | 2014 |
| FMB Supplier Limited | Wholesale & retail | 2024 |
| FMR Plastics Limited | Health & social care | 2026 |
| Fmskin Ltd | Other services | 2018 |
| FNF International Ltd | Wholesale & retail | 2024 |
| Focal Point (Ware) Management Company Limited | Households | 2005 |
| Focus EYE Centre Limited | Health & social care | 2005 |
| Focus Prime Ltd | Real estate | 2024 |
| Food for Thought Consulting Limited | Public administration | 2015 |
| Food Fusioneer Ltd | Hospitality | 2018 |
| Food Hygiene Training Company Limited | Professional & scientific | 1999 |
| Food Solution (England) Limited | Hospitality | 2016 |
| Food Solutions Europe Limited | Wholesale & retail | 2024 |
| Football 24 Limited | Professional & scientific | 2022 |
| FOR Walls.Online Limited | Real estate | 2018 |
| Forbed & Co.Limited | Real estate | 1963 |
| Forbes Limited | Professional & scientific | 1998 |
| Force 10 Creative Ltd | Other services | 2008 |
| FORCH24 Limited | Arts & recreation | 2019 |
| Fordex Limited | Health & social care | 2023 |
| Foreshadow Security Training, Promotions and Services Ltd | Administrative & support | 2020 |
| Forest Four Limited | Households | 2012 |
| Forestdale FC Community Interest Company | Arts & recreation | 2022 |
| Forestdale FC Youth Ltd | Arts & recreation | 2021 |
| Forestwalk Developments Limited | Construction | 2002 |
| Forever Clear Limited | Real estate | 2001 |
| Forever Golf Community CIC | Education | 2026 |
| Foreview Holdings Ltd | Financial services | 2023 |
| Foreview Ltd | Professional & scientific | 2023 |
| Forex Point Ltd | Financial services | 2020 |
| Formad Ltd | Professional & scientific | 2001 |
| Formation 4 Free Ltd | Professional & scientific | 2008 |
| Fort Knight Group Limited | Real estate | 1982 |
| Fort York Limited | Real estate | 2023 |
| Forte & Co Ltd | Wholesale & retail | 2014 |
| Forte Flourishes Ltd | Professional & scientific | 2025 |
| Forte ICT Ltd | Administrative & support | 2009 |
| Forte Investment Holding Ltd | Administrative & support | 2019 |
| Fortified Capital Ltd | Administrative & support | 2022 |
| Fortify Integrated Solutions Limited | Administrative & support | 2026 |
| Fortinvest Properties Ltd | Real estate | 2022 |
| Fortisblue Investments Limited | Financial services | 2025 |
| Fortium Accountants Ltd | Extraterritorial | 2026 |
| Fortium Software Ltd | Information & communication | 2026 |
| Fortium Tax Ltd | Extraterritorial | 2026 |
| Fortress Finance Ltd | Professional & scientific | 2025 |
| Fortress Land & Property Limited | Real estate | 2016 |
| Fortress Land Cambridge 1 Ltd | Real estate | 2018 |
| Forty Four Ventures Limited | Professional & scientific | 2023 |
| Forumhall Capital Limited | Financial services | 2017 |
| Foulds Pre-School Ltd | Education | 2017 |
| Found for YOU Properties Ltd | Real estate | 2021 |
| Foundrs Holdings (UK) Limited | Information & communication | 2025 |
| Fourmitech Ltd. | Information & communication | 1995 |
| Fourrts (UK) Pharmacare Ltd | Manufacturing | 2011 |
| Fourth River Property Company Limited | Real estate | 2015 |
| FOX Rodney Search Limited | Administrative & support | 1999 |
| FOX Security Limited | Extraterritorial | 2011 |
| FQE Enterprises Limited | Other services | 2009 |
| FQE International Enterprises Limited | Administrative & support | 2023 |
| Frabjous Ltd | Wholesale & retail | 2015 |
| Fractus CFO Ltd | Professional & scientific | 2025 |
| Franbrey Limited | Wholesale & retail | 2011 |
| Franceschi Music Limited | Arts & recreation | 2014 |
| Franchise House Ltd | Administrative & support | 2016 |
| Franchise World Ltd | Administrative & support | 2016 |
| Frangy Ltd | Information & communication | 2025 |
| Franj Ltd | Financial services | 2019 |
| Frank & Terence Ltd | Real estate | 2017 |
| Frank UK Limited | Information & communication | 2006 |
| Frankie & Bobbles Ltd | Construction | 2012 |
| Franklins Motor Cars Limited | Wholesale & retail | 2022 |
| Franks Express Catering Ltd | Hospitality | 2012 |
| Franks Express Limited | Hospitality | 2011 |
| Franks Keys Ltd | Administrative & support | 2014 |
| Franwyn Finance Limited | Administrative & support | 2019 |
| Franwyn Holdings Limited | Professional & scientific | 2015 |
| Franwyn Properties Limited | Construction | 2024 |
| Franwyn Securities Limited | Construction | 2018 |