| Felicia YAP Limited | Arts & recreation | 2016 |
| Felicidade Limited | Information & communication | 2010 |
| Felicita Property Ltd | Real estate | 2024 |
| Felicitas Consulting Limited | Information & communication | 2010 |
| Felix Brew Limited | Transport & logistics | 2025 |
| Felix Estates Limited | Real estate | 2014 |
| Fell and Lord Properties Ltd | Real estate | 2025 |
| Fell Builders Limited | Construction | 2023 |
| Fell Lane Mini Market Ltd | Wholesale & retail | 2011 |
| Fellerman Property Company Ltd | Real estate | 2021 |
| Fellowship of Evangelistic Ministries | Other services | 1997 |
| Female Magik Ltd | Information & communication | 2021 |
| Fembex Limited | Health & social care | 2021 |
| Fembim Real Estate Ltd | Real estate | 2024 |
| Feme Aura Limited | Other services | 2020 |
| Femedici Ltd | Health & social care | 2017 |
| Femwals Business Solutions Limited | Administrative & support | 2014 |
| Fenagy UK Limited | Manufacturing | 2023 |
| Fend Property Ltd | Real estate | 2022 |
| Fenetre Group Limited | Wholesale & retail | 2024 |
| Fenevita Ltd | Hospitality | 2022 |
| Fenex Limited | Wholesale & retail | 2013 |
| Fenix CBT Ltd | Health & social care | 2022 |
| Fenix of Hope Limited | Wholesale & retail | 2020 |
| Fennec & Darwin Ltd | Wholesale & retail | 2019 |
| Fennell Investment Co. | Professional & scientific | 2024 |
| Fennell Property Co Limited | Real estate | 2025 |
| Fennturn Limited | Water & waste | 1977 |
| Fenton Packaging (Leeds) Limited | Professional & scientific | 1945 |
| Fenton Packaging Limited | Transport & logistics | 1983 |
| Fentons Maintenance Limited | Construction | 2026 |
| Fenyasoft UK Ltd | Information & communication | 2025 |
| Feral Child Yorkshire Limited | Manufacturing | 2022 |
| Ferens Group Ltd | Wholesale & retail | 2023 |
| Fergus Mansfield Ltd | Wholesale & retail | 2022 |
| Fergus Smith Limited | Professional & scientific | 2010 |
| Ferguson Civil Engineering (London) Limited | Construction | 2019 |
| Ferguson Design Consultants Limited | Professional & scientific | 2007 |
| Ferguson Murray Properties Ltd | Real estate | 2025 |
| Ferguson Plant Hire (UK) Ltd | Administrative & support | 2019 |
| Ferhad Limited | Wholesale & retail | 2024 |
| Fermat Cleaning Services Limited | Administrative & support | 2025 |
| Fern Tree Group Ltd | Financial services | 2025 |
| Fernando Bkcw Ltd | Real estate | 2016 |
| Fernando Healthcare Solutionsns Limited | Health & social care | 2025 |
| Ferndale Child Health Limited | Health & social care | 2025 |
| Fernlee Lettings Ltd | Real estate | 2021 |
| Fernway Limited | Wholesale & retail | 1996 |
| Fernwood Financial Ltd | Financial services | 2003 |
| Ferranti Effect Limited | Financial services | 2016 |
| Ferratsi Bathrooms Limited | Extraterritorial | 2011 |
| Ferratsi Limited | Extraterritorial | 2006 |
| Ferreira Enterprises Ltd | Construction | 2025 |
| Ferrocement Developments Limited | | 1986 |
| Ferry Meadows Properties Ltd | Real estate | 2025 |
| Ferwood Machinery Limited | Manufacturing | 2015 |
| Festival Foods Limited | Wholesale & retail | 1955 |
| Festival Hampers Limited | Wholesale & retail | 2000 |
| FET Properties Limited | Real estate | 2021 |
| Fettl Ltd | Information & communication | 2021 |
| Fevel Ltd | Financial services | 2026 |
| Fever Casting Ltd | Information & communication | 2020 |
| Fever Fever Ltd | Administrative & support | 2014 |
| Feversham Arms Limited | Hospitality | 2003 |
| FEW and FAR Ltd | Information & communication | 2018 |
| FEW Family Gifts Limited | Wholesale & retail | 2017 |
| FEW Investments Ltd | Financial services | 2026 |
| Fewspharm Limited | Health & social care | 2026 |
| Fewston Limited | Extraterritorial | 2019 |
| Feymanor Limited | Construction | 2015 |
| FF Medical Ltd | Health & social care | 2022 |
| Ffin Studio Limited | Professional & scientific | 2025 |
| FG Delivery Limited | Professional & scientific | 2017 |
| FG the PT Limited | Arts & recreation | 2024 |
| FGC Services Ltd | Other services | 2016 |
| FGH Property Limited | Real estate | 2022 |
| FGS Engineering (Leeds) Ltd | Professional & scientific | 2024 |
| Fgsk Limited | Real estate | 2026 |
| FGW Business Limited | Professional & scientific | 2002 |
| FH Pharma Ltd | Health & social care | 2018 |
| FHA Developments Limited | Real estate | 2021 |
| Fhaolain Hydro Ltd | Energy | 2017 |
| FHM Properties Ltd | Financial services | 2020 |
| FHS Locum Services Limited | Health & social care | 2012 |
| FI Conversions Ltd | Construction | 2011 |
| FI26 Ltd | Real estate | 2018 |
| Fiamavle & Co Ltd | Professional & scientific | 2018 |
| Fiaz Siddique Investments Limited | Real estate | 2022 |
| Fiaz Siddique Limited | Professional & scientific | 2020 |
| Fibatube Limited | Extraterritorial | 1968 |
| Fiber International Limited | Information & communication | 2022 |
| Fiberfab (PVT) Ltd | Wholesale & retail | 2020 |
| Fibre Extrusion Technology Limited | Manufacturing | 1998 |
| Fibre Networks Infrastructure Limited | Information & communication | 2023 |
| Fibreglass Company Limited | Wholesale & retail | 2024 |
| Fibreserve Ltd | Information & communication | 2022 |
| Fibrestreet Limited | Wholesale & retail | 2024 |
| FIC Headingley Ltd | Hospitality | 2026 |
| Fichasia Limited | Administrative & support | 2025 |
| Fiche & Chips Limited | Professional & scientific | 2000 |