| Fiaro Partners LLP | | 2023 |
| Fiat Poseidon Auto Parts Co., Ltd | Manufacturing | 2022 |
| Fiberight Limited | Manufacturing | 2008 |
| Fiberskull Ltd | Other services | 2024 |
| Fibersys Tech Solutions Ltd | Information & communication | 2023 |
| Fibre 1ST Ltd | Information & communication | 2023 |
| Fibre Data Installations Limited | Construction | 2013 |
| Fibrelay Utilities Limited | Other services | 2009 |
| Fiddy Films Ltd | Information & communication | 2021 |
| Fidelity ACH Ltd | Health & social care | 2020 |
| Fidget Bugs Ltd | Wholesale & retail | 2026 |
| Fidocs Customs Brokerage Limited | Transport & logistics | 2023 |
| Fids Consultancy Limited | Professional & scientific | 2016 |
| Fids Property Ltd | Real estate | 2018 |
| Fiduciam Ltd | Health & social care | 2015 |
| Field Building Services Limited | Construction | 2020 |
| Field House Property Management Ltd | Real estate | 2019 |
| Field IP Limited | Information & communication | 2025 |
| Fieldclear Robotics Ltd | Other services | 2024 |
| Fieldmade Ltd | Professional & scientific | 2023 |
| Fieldmoor Properties Limited | Real estate | 2016 |
| FIF Exchange Ltd | Transport & logistics | 2023 |
| Fifield Building Solutions Ltd | Construction | 2020 |
| Fifth C Ltd | Wholesale & retail | 2019 |
| Figo Computers Ltd | Other services | 2018 |
| Fijan Healthcare Ltd | Health & social care | 2023 |
| Fijan Services Limited | Real estate | 2024 |
| FIL Design Ltd | Professional & scientific | 2016 |
| Filby and Wood Limited | Hospitality | 2022 |
| Filex Haulage Ltd | Transport & logistics | 2021 |
| Filliano Court Limited | Households | 1986 |
| Film Academy Milton Keynes Limited | Information & communication | 2024 |
| Film Drive Limited | Transport & logistics | 2018 |
| Film Logistics Holdings Limited | Transport & logistics | 2021 |
| Film Logistics Limited | Transport & logistics | 2006 |
| Filo Capital Ltd | Administrative & support | 2025 |
| Filter Search Ltd | Manufacturing | 2023 |
| Filterit Ltd | Other services | 2023 |
| Filtrona Textile Products Limited | Professional & scientific | 1968 |
| Fimfiction Limited | Information & communication | 2025 |
| Fimi Holdings Ltd | Real estate | 2022 |
| Final Select Ltd | Administrative & support | 2026 |
| Finance & Automation Consulting Ltd | Information & communication | 2022 |
| Finance Fixers Limited | Wholesale & retail | 2025 |
| Financial Aspirations Limited | Financial services | 2017 |
| Financial Growth Plus Ltd | Professional & scientific | 2015 |
| Financial Orbit Limited | Financial services | 2013 |
| Financial Services Compliance Limited | Financial services | 2001 |
| Financial Strategy Limited | Extraterritorial | 1995 |
| Financial Technology Advisers Limited | Information & communication | 2015 |
| Financialware Limited | Professional & scientific | 1997 |
| Finara Ltd | Construction | 2025 |
| Finch & Sons Family Funeral Service Limited | Other services | 2013 |
| Finchstone Ltd | Real estate | 2024 |
| Fincity Consultancy Services Limited | Information & communication | 2017 |
| Find a GAP Limited | Professional & scientific | 2003 |
| Find Digs Holdings Limited | Financial services | 2017 |
| Find Digs Limited | Hospitality | 2009 |
| Findaproperty.Mu Ltd | Information & communication | 2020 |
| Findlater Developments Limited | Real estate | 2025 |
| Findlayautomations Ltd | Information & communication | 2025 |
| Findmeanengineer Ltd | Administrative & support | 2014 |
| Findmycoach Ltd | Information & communication | 2025 |
| Fine Abodes Ltd. | Real estate | 2018 |
| Fine and Dandy Antiques and Collectables Ltd | Administrative & support | 2016 |
| Fine Manor Events Limited | Hospitality | 2010 |
| Fine Pixel Ltd | Manufacturing | 2026 |
| Fineglatt Ltd | Manufacturing | 2020 |
| Finesquare Limited | Health & social care | 2025 |
| Finesse Goods Limited | Wholesale & retail | 2020 |
| Finesse Models Limited | Professional & scientific | 2019 |
| Finest Aesthetics & Wellness Ltd | Other services | 2026 |
| Finest Clean Ltd | Administrative & support | 2022 |
| Finestory Properties Limited | Real estate | 2021 |
| Finexp Ltd | Information & communication | 2010 |
| Finlays Limited | Administrative & support | 2017 |
| Finlayson Management Company Ltd | Professional & scientific | 2023 |
| Finli (Client Assets) Limited | Financial services | 2026 |
| Finli (FA92) Limited | Financial services | 2000 |
| Finli (FLP) Ltd | Financial services | 2012 |
| Finli (G&P) Ltd | Financial services | 1988 |
| Finli (GPC) Ltd | Financial services | 2018 |
| Finli (Gpgfs) Ltd | Financial services | 1999 |
| Finli (GPH) Ltd | Professional & scientific | 2018 |
| Finli (Gpherts) Ltd | Financial services | 2014 |
| Finli (GPS) Ltd | Financial services | 2003 |
| Finli (Ipwm) Limited | Financial services | 2012 |
| Finli (Kent) Limited | Financial services | 2026 |
| Finli (PDB) Ltd | Financial services | 2018 |
| Finli (Thames Valley) Ltd | Financial services | 2010 |
| Finli (Westerham) LLP | | 2010 |
| Finli Advice Holdings Limited | Financial services | 2021 |
| Finlon Limited | Construction | 2013 |
| Finlor Logistics Ltd | Transport & logistics | 2019 |
| Finn Transport Ltd | Transport & logistics | 2025 |
| Finndent Limited | Health & social care | 2023 |
| Finraft Limited | Information & communication | 2015 |
| Finstack Limited | Information & communication | 2022 |
| Finsure Analytics Limited | Information & communication | 2026 |
| Fintec Associates LLP | | 2008 |