| FFS Associates Limited | Administrative & support | 2019 |
| FFX Derby Ltd | Hospitality | 2025 |
| FFX Holdings Ltd | Hospitality | 2024 |
| FFX Services Ltd | Hospitality | 2025 |
| FFX Tyburn Ltd | Hospitality | 2024 |
| FFX Walsall Ltd | Hospitality | 2025 |
| FFX Winsor Ltd | Hospitality | 2026 |
| Ffza Ltd | Information & communication | 2019 |
| FG Auto Solutions Ltd | Wholesale & retail | 2020 |
| FG Barber Shop Ltd | Other services | 2023 |
| FG3D Design Ltd | Professional & scientific | 2021 |
| Fgcw Limited | Arts & recreation | 2021 |
| Fghr Property Services Ltd | Construction | 2024 |
| FGM Property Management Ltd | Real estate | 2025 |
| FGS Express Limited | Transport & logistics | 2026 |
| FH & Sons Investments Limited | Real estate | 2013 |
| FH Bristol Limited | Hospitality | 2022 |
| FH Capital Limited | Administrative & support | 2013 |
| FH Doncaster Limited | Hospitality | 2025 |
| FH One Holdings Limited | Real estate | 2024 |
| FH Road Contractors Limited | Construction | 2023 |
| Fh&B 1 Ltd | Other services | 2025 |
| Fh&B 2 Ltd | Other services | 2025 |
| Fh-Union UK Limited | Wholesale & retail | 2014 |
| FHA Carpentry Limited | Manufacturing | 2026 |
| FHC Accountancy Services Limited | Professional & scientific | 2018 |
| Fhcoleshill Ltd | Hospitality | 2025 |
| FHF Security K9 Ltd | Financial services | 2022 |
| Fhfi Ltd | Administrative & support | 2008 |
| Fhiralma Limited | Real estate | 2013 |
| FHL Always Ltd | Real estate | 2023 |
| FHL Property Investments Limited | Real estate | 2022 |
| Fhsw Ltd | Administrative & support | 2025 |
| FI Children's Care Ltd | Health & social care | 2025 |
| FI LC Ltd | Hospitality | 2025 |
| Fi's Goods & Services Ltd | Wholesale & retail | 2022 |
| Fiasco Ltd | Wholesale & retail | 2025 |
| Fiat 500 Doctors Ltd | Wholesale & retail | 2023 |
| Fiaz Limited | Wholesale & retail | 2025 |
| Fibonacci Training Ltd | Education | 2024 |
| Fibraxis Limited | Manufacturing | 2024 |
| Fibre Core Communications Ltd | Construction | 2019 |
| Fibre First Limited | Information & communication | 2012 |
| Fibre Inc Ltd | Information & communication | 2024 |
| Fibre Stay Limited | Information & communication | 2023 |
| Fibress Limited | Information & communication | 2005 |
| Ficotax Limited | Professional & scientific | 2025 |
| Ficus Carica International Co. Ltd. | Real estate | 2020 |
| Fida Aesthetic Ltd | Other services | 2023 |
| Fida Therapy Clinic Ltd | Health & social care | 2025 |
| Fidaa.S Trading Ltd | Wholesale & retail | 2026 |
| Fidel Restaurant Limited | Hospitality | 2024 |
| Fidelis Contract Services Ltd | Administrative & support | 2011 |
| Fidelity Care Services Ltd | Health & social care | 2005 |
| Fides Collective Ltd | Administrative & support | 2025 |
| Fidexo Limited | Real estate | 2018 |
| Fidia Pharma UK Ltd | Administrative & support | 2021 |
| Fidix & Gray Properties Ltd | Real estate | 2020 |
| Fiducia Car Co Ltd | Wholesale & retail | 2023 |
| Field and Feast Limited | Hospitality | 2025 |
| Field Army Limited | Wholesale & retail | 2023 |
| Field END Homes Limited | Construction | 2018 |
| Field Fleet Group Ltd | Real estate | 2020 |
| Field Fleet Properties Ltd | Real estate | 2025 |
| Field Fleet Services Limited | Other services | 2015 |
| Field Operations Assist Ltd | Agriculture & fishing | 2025 |
| Field Spice Ltd | Hospitality | 2019 |
| Fieldforce Property Solutions Limited | Real estate | 2021 |
| Fieldforce Utility Services Limited | Construction | 2019 |
| Fieldfree Limited | Arts & recreation | 1997 |
| Fielding&Greenproperties Ltd | Extraterritorial | 2025 |
| Fieldleader Limited | Real estate | 2000 |
| Fields Bidco Limited | Financial services | 2022 |
| Fields Business Advisors Limited | Professional & scientific | 2022 |
| Fields of Norfolk LP | | 2017 |
| Fieldston Limited | Health & social care | 1997 |
| Fieldwork London Ltd | Other services | 2010 |
| Fierce! (Festival) Limited | Arts & recreation | 2002 |
| Fiery Hill Investments Limited | Real estate | 2021 |
| Fiesta Investment Ltd | Construction | 2019 |
| Fiestal Ltd | Wholesale & retail | 2025 |
| Fifeco Ltd | Arts & recreation | 2019 |
| Fifteen Property Ltd | Construction | 2025 |
| Fifth Element Consulting Ltd | Professional & scientific | 2004 |
| Fifth Gallery Limited | Wholesale & retail | 2024 |
| Fifth Leaf Ltd | Wholesale & retail | 2022 |
| Fifty Nine Hundred Company Ltd | Real estate | 2024 |
| Fifty Two Housing Ltd | Households | 2025 |
| Fifty Two IVY Limited | Real estate | 2021 |
| FIFTY5BYTES Ltd | Information & communication | 2020 |
| Fight Protect Limited | Manufacturing | 2025 |
| FIGS25 Limited | Other services | 2018 |
| Figsa Business Ltd | Wholesale & retail | 2026 |
| FIIDOW2 Logistics Ltd | Transport & logistics | 2024 |
| Fiilecade Autos Ltd | Wholesale & retail | 2020 |
| Fiiveerkia Limited | Manufacturing | 2025 |
| Fiixxy Ltd | Wholesale & retail | 2017 |
| Fiji Skin Clinic Limited | Extraterritorial | 2021 |
| Fika (B.G) Limited | Hospitality | 2024 |
| Fika Bageri Ltd | Manufacturing | 2026 |