| Four Seasons (Bamford) Limited | Health & social care | 2006 |
| Four Walls Interior Design Ltd | Other services | 2011 |
| Four Winds Ventures Limited | Real estate | 2013 |
| Fourbe Future Mind Ltd | Extraterritorial | 2023 |
| Fourboys Investments Ltd | Financial services | 2017 |
| Fourcrest Estates Ltd | Real estate | 2026 |
| Fourcroft Hotel (Tenby) Limited | Hospitality | 1963 |
| Fourdimes Ltd | Extraterritorial | 2002 |
| Fouria Records Ltd | Information & communication | 2025 |
| Fourj Support Services Limited | Information & communication | 2022 |
| Fourleaf Central NW Ltd | Administrative & support | 2021 |
| Fourleaf NW Ltd | Information & communication | 2023 |
| Fourm Consultancy Services Limited | Professional & scientific | 2024 |
| Fourm Property Investments Limited | Real estate | 2019 |
| Foursided Ltd | Wholesale & retail | 2019 |
| Foursome Ventures Ltd | Administrative & support | 2024 |
| Fourteen Dots Ltd | Information & communication | 2025 |
| Fourteen Eight Property Ltd | Real estate | 2026 |
| Fourtees Investment Limited | Real estate | 2023 |
| Fourth Roodhill Leasing Limited | Administrative & support | 1983 |
| Fourth ROW Developments Ltd | Real estate | 2023 |
| Fourth Street Place Consultants Limited | Professional & scientific | 2011 |
| Fourth Wall Building Consultancy Limited | Professional & scientific | 2020 |
| Fourth Wave Wine Partners UK Ltd | Wholesale & retail | 2022 |
| Fourthline Limited | Professional & scientific | 2009 |
| Fourtune Sweet International Limited | Professional & scientific | 2022 |
| Fourwave Group Limited | Wholesale & retail | 2025 |
| Fourwaymedia Ltd | Administrative & support | 2020 |
| Fourwheeldrivetrading Ltd | Wholesale & retail | 2025 |
| Fourxfour Works Ltd | Administrative & support | 2026 |
| Foward Limited | Wholesale & retail | 2023 |
| FOX & Cuckoo Limited | Wholesale & retail | 2021 |
| FOX & Pickle Associates Ltd | Professional & scientific | 2024 |
| FOX Air Soft Ltd | Wholesale & retail | 2026 |
| FOX Art Entertainment Ltd | Information & communication | 2025 |
| FOX Digital Services Limited | Information & communication | 2023 |
| FOX Fabs Limited | Hospitality | 2003 |
| FOX Flare Games Ltd | Information & communication | 2025 |
| FOX Installation Services Ltd | Manufacturing | 2023 |
| FOX Interior Services Ltd | Construction | 2019 |
| FOX Joinery Services Limited | Construction | 2025 |
| FOX LSC Limited | Professional & scientific | 2021 |
| FOX on Ramstreet Ltd | Real estate | 2023 |
| FOX Studios (GB) Limited | Professional & scientific | 2011 |
| FOX UK Properties Limited | Real estate | 2021 |
| Foxbee BB Limited | Wholesale & retail | 2017 |
| Foxco Investments Limited | Other services | 2024 |
| Foxconn Secure Ltd | Administrative & support | 2026 |
| Foxdenton Estate Company Limited | Manufacturing | 1935 |
| Foxdenton Farm Livery Yard Ltd | Agriculture & fishing | 2022 |
| Foxdenton Farm Riding School Limited | Arts & recreation | 2022 |
| Foxdog Studios Ltd | Arts & recreation | 2012 |
| Foxell Mechanical Services Ltd | Manufacturing | 2020 |
| Foxes DEN Entertainment Ltd | Arts & recreation | 2025 |
| Foxfield Fine Leather Ltd | Manufacturing | 2021 |
| Foxford Properties Ltd | Construction | 2005 |
| Foxfox Limited | Real estate | 2011 |
| Foxglove Hotel Limited | Hospitality | 2018 |
| Foxglove Hotel Management Limited | Hospitality | 2018 |
| Foxheaven House Limited | Professional & scientific | 2025 |
| Foxley Farm Operations Ltd | Information & communication | 2025 |
| Foxley Farm Ventures Ltd | Financial services | 2025 |
| Foxley Lettings & Property Management Ltd | Real estate | 2012 |
| Foxling Ltd | Information & communication | 2018 |
| Foxmind Tech Ltd | Wholesale & retail | 2025 |
| Foxton Car Wash Ltd | Other services | 2022 |
| Foxwells Builders Limited | Construction | 2010 |
| Foxx Marine Services Ltd | Administrative & support | 2025 |
| Foxy Fisheries Ltd | Agriculture & fishing | 2025 |
| FOY HFX Ltd | Real estate | 2026 |
| Fozias Kitchen Ltd | Hospitality | 2026 |
| FP Capital Trading Limited | Administrative & support | 2023 |
| FP Foods Ltd | Wholesale & retail | 2020 |
| FP Offices Limited | Construction | 2025 |
| FPB Holdings Ltd | Wholesale & retail | 2022 |
| FPC Acre General Partner Limited | Financial services | 2021 |
| FPC Acre II General Partner Limited | Financial services | 2021 |
| FPC Acre III General Partner Limited | Financial services | 2021 |
| FPC General Partner Limited | Financial services | 2020 |
| FPC Properties Ltd | Real estate | 2020 |
| Fpdg ENG Ltd | Manufacturing | 2019 |
| FPL Trading Limited | Wholesale & retail | 2018 |
| FPS Group Ltd. | Administrative & support | 2017 |
| FPS Management Ltd | Professional & scientific | 2009 |
| Fpsf Ltd | Education | 2024 |
| FQ Commercial Investments Limited | Real estate | 2019 |
| Fq.Trading.Mcr Ltd | Wholesale & retail | 2025 |
| FR & HR Properties Limited | Real estate | 2023 |
| FR Courier Services Ltd | Transport & logistics | 2019 |
| FR Invest Limited | Real estate | 2023 |
| FR Legacy Group Limited | Wholesale & retail | 2024 |
| FR Medics NW Ltd | Wholesale & retail | 2025 |
| FR Mortgages Ltd | Financial services | 2020 |
| FR Property Development Ltd | Construction | 2018 |
| FRA Ltd | Information & communication | 2018 |
| Frabukol Global UK Ltd | Wholesale & retail | 2026 |
| Fractal City Records Limited | Information & communication | 2019 |
| Fractured Youth Ltd | Wholesale & retail | 2025 |
| Fradhan Limited | Administrative & support | 2023 |
| Fraggell Productions Ltd | Information & communication | 2019 |