| Forecourt Property Investment Ltd | Real estate | 2026 |
| Forelands Group Ltd | Information & communication | 2022 |
| Forest Friends Ltd | Education | 2022 |
| Forest of Grace UK Ltd | Health & social care | 2021 |
| Forest Produce (UK) Limited | Agriculture & fishing | 2007 |
| Forest Road Investments Limited | Real estate | 2017 |
| Forextraderszone Limited | Information & communication | 2019 |
| Forfinance Limited | Professional & scientific | 2025 |
| Forgecenter Ltd | Wholesale & retail | 2026 |
| Fork in Hand Ltd | Real estate | 2017 |
| Form Construction Consultants Limited | Professional & scientific | 2025 |
| Formagility Ltd | Professional & scientific | 2021 |
| Formanta Limited | Real estate | 1988 |
| Formatki Limited | Construction | 2017 |
| Formosa Fast Food Limited | Hospitality | 2023 |
| Formula One Yachts Limited | Extraterritorial | 2008 |
| Formup RC Frame Ltd | Construction | 2017 |
| Formwork and Steel Fixing Specialist Ltd | Construction | 2017 |
| Forqa Ltd | Wholesale & retail | 2025 |
| Forte Mattress Limited | Manufacturing | 2018 |
| Fortes Services Ltd | Construction | 2021 |
| Forth Living Limited | Real estate | 2020 |
| Forthelandlords.Com Acquisition Vehicle Ltd | Real estate | 2019 |
| Forthelandlords.Com Ltd | Real estate | 2012 |
| Fortia Contractors Ltd | Administrative & support | 2018 |
| Fortior Consulting Limited | Information & communication | 2023 |
| Fortis Fire Doors & Windows Ltd | Construction | 2025 |
| Fortnum Developments Limited | Construction | 2014 |
| Fortnum Investments Ltd | Real estate | 2021 |
| Fortress Capital Partners Ltd. | Financial services | 2015 |
| Fortress Computing Technology Limited | Professional & scientific | 2019 |
| Fortune Contractors Limited | Construction | 2022 |
| Fortune Packaging Ltd | Wholesale & retail | 2019 |
| FORTUNE163 Ltd | Real estate | 2019 |
| Fortunis Consulting Limited | Information & communication | 2017 |
| Fortyfive 10 Limited | Wholesale & retail | 2002 |
| Fortyone Limited | Financial services | 2022 |
| Fortyone Money Limited | Financial services | 2020 |
| Forum Consultancy Limited | Construction | 2020 |
| Forum Finance Limited | Financial services | 1990 |
| Forward Sales Ltd | Wholesale & retail | 2019 |
| FORWARD4FAMILIES LLP | | 2012 |
| Fostering With Cariad Limited | Other services | 2019 |
| Foto Collective Limited | Professional & scientific | 2006 |
| Foulsham Investments | Administrative & support | 2005 |
| Founders Hive Ltd | Education | 2023 |
| Foundry Property Holdings Limited | Real estate | 2025 |
| Fountain House (Nuneaton) Limited | Real estate | 2020 |
| Fountain Software Limited | Information & communication | 1998 |
| Four Bros Limited | Professional & scientific | 2012 |
| Four IV Interiors Limited | Administrative & support | 1998 |
| Four Leaf Industries Ltd | Wholesale & retail | 2018 |
| Four Ones Homes Ltd | Real estate | 2025 |
| Four Seasons Travel Ltd | Administrative & support | 2016 |
| Four Toed Lotus Limited | Arts & recreation | 2024 |
| Four Triangle Limited | Extraterritorial | 2016 |
| Four Triangle Properties Ltd | Financial services | 2025 |
| Fourell Limited | Wholesale & retail | 2012 |
| Fourfive Limited | Real estate | 2022 |
| Fourfour Estates Ltd | Real estate | 2021 |
| Fourfour Insight Ltd | Information & communication | 2015 |
| Fourguysandahammer Ltd | Construction | 2023 |
| Fourteen Capital London Limited | Real estate | 2018 |
| Fourteen Logistics Limited | Transport & logistics | 2026 |
| Fourteen Property Limited | Real estate | 2018 |
| Fourteen to Sixteen Limited | Real estate | 2004 |
| Fourth Generation Group Limited | Manufacturing | 2019 |
| FOX Medical Limited | Health & social care | 2004 |
| FOX Trend (Putney) Limited | Real estate | 2014 |
| FOX Trend Holdco Limited | Other services | 2026 |
| FOX Trend Ltd | Real estate | 2013 |
| Foxgrove Limited | Professional & scientific | 1995 |
| Foxley Creative Limited | Arts & recreation | 2023 |
| Foxley Lane Services Limited | Wholesale & retail | 2008 |
| Foxtails Beauty Ltd | Other services | 2025 |
| Foxton Store Limited | Wholesale & retail | 2017 |
| Foxwood Holdings Limited | Real estate | 2023 |
| Foxword Limited | Administrative & support | 2011 |
| Foyers Group Ltd | Construction | 2025 |
| Foyers Sporting Ltd | Administrative & support | 2020 |
| FP Ventures Limited | Extraterritorial | 2011 |
| FPK & Co Properties Ltd | Real estate | 2025 |
| FPS FX Ltd | Information & communication | 2024 |
| FPU (2) Investments Limited | Real estate | 2023 |
| FPU Investments Limited | Real estate | 2021 |
| FR Chauffeuring Ltd | Transport & logistics | 2019 |
| FR Sellers Ltd | Wholesale & retail | 2026 |
| FR5 Consulting Limited | Professional & scientific | 2016 |
| Fractional Leaders Group Limited | Professional & scientific | 2026 |
| Fractionality Ltd | Professional & scientific | 2021 |
| Fradin Property Ltd | Real estate | 2021 |
| Fragaria Ltd | Other services | 2004 |
| Fragency Ltd | Real estate | 2015 |
| Fragrance Avenue Limited | Wholesale & retail | 2020 |
| FRAGRANCE4YOU Limited | Wholesale & retail | 2020 |
| Frame & Focus Ltd | Professional & scientific | 2023 |
| Frame & Fortress Doors Limited | Financial services | 2023 |
| Frame Focus Studios Ltd | Professional & scientific | 2025 |
| Frame Worldwide Ltd | Arts & recreation | 2019 |
| Framework PMO Consulting Ltd | Professional & scientific | 2022 |