| From the Inside OUT Ltd | Manufacturing | 2021 |
| From the Roots Community Interest Company | Arts & recreation | 2014 |
| From Yard to Home Limited | Wholesale & retail | 2024 |
| From Your Vision C.I.C. | Manufacturing | 2026 |
| Frome Bearings and Belts Limited | Wholesale & retail | 2010 |
| Frome Catering Limited | Hospitality | 2022 |
| Front Room Media Ltd | Information & communication | 2010 |
| Front Street Kitchen Limited | Hospitality | 2025 |
| Front Worth Ltd | Real estate | 2017 |
| Frontier Aviation Ltd | Transport & logistics | 2010 |
| Frontier Aviation Personnel Ltd | Administrative & support | 2022 |
| Frontier Development Capital Limited | Financial services | 2016 |
| Frontier Development Holdings Limited | Financial services | 2016 |
| Frontier Island Ltd | Other services | 2025 |
| Frontier MOT Centre Limited | Wholesale & retail | 2010 |
| Frontier Point Ltd | Wholesale & retail | 2025 |
| Frontier Risk Solutions Limited | Transport & logistics | 2024 |
| Frontier Sapiens Ltd | Other services | 2019 |
| Frontier Trading International Limited | Wholesale & retail | 2008 |
| Frontier Volksworks Limited | Wholesale & retail | 2009 |
| Frontiersources Ltd | Professional & scientific | 2026 |
| Frontline Automotive Ltd | Administrative & support | 2026 |
| Frontline Counsel Limited | Professional & scientific | 2016 |
| Frontline Good Samaritan Ltd | Administrative & support | 2026 |
| Frontline IT Solutions Limited | Information & communication | 2008 |
| Frost and Ember Ltd | Wholesale & retail | 2025 |
| Frost City Jewellers Ltd | Manufacturing | 2022 |
| Frost Electroplating Limited | Manufacturing | 2000 |
| Frost Properties Limited | Real estate | 1964 |
| Frosted Ltd | Hospitality | 2026 |
| Frostedge Limited | Manufacturing | 2025 |
| Frosty Canvas Community Interest Company | Arts & recreation | 2023 |
| Frow Magazine Limited | Information & communication | 2020 |
| Frow Studios Ltd | Information & communication | 2026 |
| Frozen KIN Limited | Manufacturing | 2025 |
| FRQ Design Co Ltd | Manufacturing | 2026 |
| FRS (Birmingham) Limited | Hospitality | 2012 |
| FRS Housing Ltd | Real estate | 2025 |
| FRS International Limited | Professional & scientific | 2025 |
| Fruit & Ice Limited | Hospitality | 2018 |
| Fruit & VEG Worldwide Limited | Wholesale & retail | 2020 |
| Fruit and VEG Global Limited | Wholesale & retail | 2023 |
| Fruit DE Paul Ltd | Wholesale & retail | 2022 |
| Fruit Fusion Ltd | Wholesale & retail | 2025 |
| Fruitaholic Limited | Wholesale & retail | 2021 |
| Fruitfields Orchard Limited | Agriculture & fishing | 2018 |
| Fruithub Limited | Wholesale & retail | 2025 |
| Fruitland Ltd | Extraterritorial | 2021 |
| Fruity Paradise Limited | Manufacturing | 2022 |
| Fruizen Ltd | Wholesale & retail | 2025 |
| Frumble Limited | Wholesale & retail | 2013 |
| Fruve UK Ltd | Wholesale & retail | 2017 |
| FRY Creative Consulting Limited | Information & communication | 2023 |
| Fryat Ltd | Wholesale & retail | 2023 |
| Fryintel Advisers Ltd | Professional & scientific | 2026 |
| FS & Co Holdings Ltd | Real estate | 2026 |
| FS 26 Limited | Hospitality | 2024 |
| FS Commerce Ltd | Wholesale & retail | 2026 |
| FS Comms Ltd | Professional & scientific | 2016 |
| FS Fermaine Limited | Construction | 2012 |
| FS Logistics and Transport Ltd | Transport & logistics | 2026 |
| FS Pharm Ltd | Wholesale & retail | 2022 |
| FS Pharma Ltd | Health & social care | 2021 |
| FS Tax Limited | Professional & scientific | 2020 |
| FS to Go Limited | Wholesale & retail | 2022 |
| Fs.Com Innovation Ltd | Wholesale & retail | 2017 |
| FS1 Solutions Limited | Wholesale & retail | 2025 |
| FS888 Ltd | Hospitality | 2020 |
| FSA Management Ltd | Real estate | 2025 |
| FSC Property Ltd | Real estate | 2019 |
| FSC Training Academy Ltd | Education | 2025 |
| FSD Medics Ltd | Health & social care | 2021 |
| FSD Traders Ltd | Construction | 2022 |
| Fsda Limited | Education | 2015 |
| Fsdr Property Solutions Ltd | Construction | 2026 |
| FSF Iqbal's Ltd | Administrative & support | 2022 |
| FSG Rentals Ltd | Real estate | 2022 |
| FSH Exeter Limited | Hospitality | 2023 |
| FSH Recruitment Solutions Ltd | Administrative & support | 2011 |
| FSH Store Limited | Wholesale & retail | 2025 |
| FSJ Holdings Ltd | Financial services | 2018 |
| FSK EYE Care Ltd | Health & social care | 2017 |
| FSK Group Limited | Extraterritorial | 2016 |
| FSP Direct Limited | Real estate | 2005 |
| FSP International UK Ltd | Wholesale & retail | 2024 |
| Fsqmi Limited | Administrative & support | 2013 |
| Fsquare African Restaurant & Lounge Ltd | Hospitality | 2025 |
| FSS Pension Trustees Limited | Financial services | 2010 |
| Fssadb Ltd | Health & social care | 2016 |
| FST Beauty Ltd | Other services | 2024 |
| Fstanescu Ltd | Construction | 2025 |
| FSV Holdings Limited | Financial services | 2023 |
| FT Enterprise Midlands Ltd | Hospitality | 2023 |
| FT Marketing Ltd | Professional & scientific | 2026 |
| FT Online Limited | Wholesale & retail | 2026 |
| FT Transformers UK Ltd | Manufacturing | 2020 |
| FTK Ltd | Other services | 2024 |
| FTK- From the Kitchen Ltd | Hospitality | 2025 |
| FTL Corporate Limited | Transport & logistics | 2024 |
| Ftmclub Ltd | Wholesale & retail | 2025 |