| FR Financial Ltd | Professional & scientific | 2014 |
| FR21 SEC Ltd | Other services | 2021 |
| Fractional CXO Ltd | Information & communication | 2018 |
| Fradanell Ltd | Health & social care | 2019 |
| Frag Farm Ltd | Agriculture & fishing | 2016 |
| Fraizas Limited | Transport & logistics | 2014 |
| Frame and Fabric Ltd | Administrative & support | 2022 |
| Frameboard Limited | Information & communication | 2026 |
| Frames Hotel Ltd | Hospitality | 2024 |
| Framewood Limited | Professional & scientific | 2016 |
| Framewood Manor Management Company Limited | Real estate | 1987 |
| Frances Lindsay & Co Limited | Professional & scientific | 2010 |
| Francium Investments Limited | Real estate | 2023 |
| Frank Aubery Media Ltd | Information & communication | 2017 |
| Franke Partners Limited | Wholesale & retail | 2026 |
| Franklin Barnes (Investment) Limited | Real estate | 1980 |
| Frantixx UK Ltd | Administrative & support | 2019 |
| Fraser Tree Company Ltd | Administrative & support | 2023 |
| Fraserandrowley Ltd | Information & communication | 2019 |
| FRASH57 Limited | Wholesale & retail | 2023 |
| Frays Property Management (NO.5) Limited | Real estate | 2001 |
| Frcacl Ltd | Administrative & support | 2023 |
| Fred & Co Recruitment Ltd | Administrative & support | 2025 |
| Freddy's Chicken (Liverpool) Ltd | Hospitality | 2017 |
| Frederick Rose Investments Limited | Real estate | 2025 |
| Fredolak Limited | Real estate | 2021 |
| Fredrick's Property Services Ltd | Real estate | 2025 |
| Freedom Hair Cutters Limited | Other services | 2007 |
| Freedomride Adaptations Ltd | Wholesale & retail | 2024 |
| Freeman Cars Ltd | Wholesale & retail | 2019 |
| Freeman King Construction Limited | Construction | 2024 |
| Freetogo Ltd | Administrative & support | 2023 |
| FREIGHTS2U Limited | Transport & logistics | 2015 |
| Frenchey Services Limited | Administrative & support | 2016 |
| Fresh Halal Meat and Bakery Ltd | Wholesale & retail | 2025 |
| Fresh Shape Limited | Households | 2011 |
| Fresh Start IT Ltd | Information & communication | 2004 |
| Fresh X Ltd | Hospitality | 2024 |
| FRESH2FRESHFOODS Ltd | Agriculture & fishing | 2026 |
| Freshdale Holdings Limited | Real estate | 2023 |
| Freshdale Supplies Limited | Wholesale & retail | 2014 |
| Freshlook Builders Ltd | Construction | 2021 |
| Freshly Made London Ltd | Construction | 2024 |
| Freshstart-Trading (SMC Private) Limited | Wholesale & retail | 2020 |
| Freya Wembley Ltd | Real estate | 2025 |
| Freyalogistics Ltd | Transport & logistics | 2026 |
| Fried Guys Kitchen Ltd | Hospitality | 2026 |
| Friends Accountancy Ltd | Professional & scientific | 2024 |
| Friends Clothing UK Ltd | Wholesale & retail | 2024 |
| Frifaith Ltd | Wholesale & retail | 2021 |
| Frimley Care Limited | Health & social care | 2024 |
| Frimley Medical Limited | Wholesale & retail | 2020 |
| Frmm Limited | Wholesale & retail | 2020 |
| From Maria Ltd | Hospitality | 2025 |
| Frontier Transport London Ltd | Transport & logistics | 2025 |
| Frontline Property Limited | Real estate | 2020 |
| Frosties Ltd | Wholesale & retail | 2023 |
| FRS Property Group Limited | Real estate | 2026 |
| Fruita Vegetable Trade Limited | Wholesale & retail | 2025 |
| Fruits for Drinks Limited | Manufacturing | 2018 |
| Fruity Bliss Limited | Wholesale & retail | 2023 |
| FS Autobody Detailing Ltd | Wholesale & retail | 2024 |
| FS Global Traders Ltd | Wholesale & retail | 2021 |
| FS Travel&Tours Ltd | Hospitality | 2025 |
| FSC Oceans Limited | Transport & logistics | 2016 |
| FSK Compliance Ltd | Professional & scientific | 2016 |
| FSK Style Ltd | Wholesale & retail | 2019 |
| Fspf Limited | Construction | 2006 |
| Fsts Services UK Limited | Transport & logistics | 2019 |
| FSZ Consultants Limited | Information & communication | 2012 |
| FTF Accounting Services Ltd | Professional & scientific | 2021 |
| Fudail Limited | Information & communication | 2026 |
| Fuel LAB Ltd | Hospitality | 2024 |
| Fueled Club Ltd | Hospitality | 2026 |
| Fujitsu Research of Europe Limited | Professional & scientific | 2001 |
| Full Circle Advisory Limited | Professional & scientific | 2023 |
| Full on Production Films Limited | Information & communication | 2020 |
| Fullers Fulfilment Limited | Transport & logistics | 2013 |
| Fullers Warehousing Services Limited | Transport & logistics | 2013 |
| Fullhouseai Ltd | Information & communication | 2026 |
| Fulrix Investments Ltd | Real estate | 2024 |
| Fulrix Limited | Wholesale & retail | 2022 |
| Funerr Ltd | Administrative & support | 2018 |
| Funkymonky Limited | Hospitality | 2024 |
| Furious Security Services Ltd | Administrative & support | 2019 |
| Furn 15 Limited | Wholesale & retail | 2026 |
| Furnfield Engineering Limited | Professional & scientific | 2025 |
| Furniture Terminal Ltd | Wholesale & retail | 2023 |
| Furnitureland Limited | Extraterritorial | 2022 |
| Furnival Construction Limited | Construction | 2016 |
| Furnival Lodge Limited | Hospitality | 2016 |
| Furzegate Limited | Construction | 2016 |
| FUS4U Ltd | Wholesale & retail | 2026 |
| Fusion Fresh Dairy Limited | Wholesale & retail | 2025 |
| Fusion Home Security Ltd | Construction | 2021 |
| FUSION242 Ltd | Information & communication | 2008 |
| Fussion Fast Ltd | Administrative & support | 2018 |
| Future Orthopaedics Ltd | Health & social care | 2018 |
| Future Projects Services Ltd | Construction | 2024 |
| Future Properties (CL) Ltd | Real estate | 2021 |