| Fifteen Oldham Ltd | Real estate | 2011 |
| Fifth AVE Ltd | Information & communication | 2024 |
| Fifth AVE Properties Ltd | Real estate | 2026 |
| Fifth Dimension Software Limited | Information & communication | 2020 |
| Fifth Space Ltd | Health & social care | 2014 |
| Fifth Wheel Recruitment Limited | Administrative & support | 2022 |
| Fifty Eyes Limited | Information & communication | 2025 |
| Fifty Five Central Road Limited | Households | 2004 |
| Fifty Five Property Investment Limited | Real estate | 2017 |
| Fifty SIX Law Limited | Professional & scientific | 2024 |
| Fifty Three Two | Arts & recreation | 2017 |
| Fifty Three Two Events Limited | Arts & recreation | 2016 |
| Fifty-One North Refining Limited | Other services | 2026 |
| Fifu Ltd | Hospitality | 2023 |
| FIG and Sparrow Ltd | Wholesale & retail | 2012 |
| FIG Solutions - Business and Advisory Ltd | Wholesale & retail | 2025 |
| FIG Tree Group Ltd | Real estate | 2024 |
| Figaro Fashion Limited | Wholesale & retail | 2014 |
| Fighawk Limited | Real estate | 2025 |
| Fight Factory Manchester Limited | Other services | 2015 |
| Fight Factory Promotions Limited | Other services | 2015 |
| Fight OR Flight Studio Ltd | Professional & scientific | 2024 |
| Fighters Apparel Ltd | Wholesale & retail | 2024 |
| Fighting Fit Elite Performance Centre Ltd | Other services | 2017 |
| Fighting Spirit Wellbeing C.I.C. | Arts & recreation | 2019 |
| Figleaves Global Trading Ltd. | Wholesale & retail | 1995 |
| Figment House Design Ltd | Professional & scientific | 2013 |
| Figns Ltd | Information & communication | 2026 |
| Figo Consult Limited | Real estate | 2019 |
| Figur Co PTY Ltd | Wholesale & retail | 2026 |
| Figured Accounting Ltd | Professional & scientific | 2021 |
| Fiit Squad Ltd | Professional & scientific | 2021 |
| Fikagrace Support Partners Ltd | Health & social care | 2026 |
| Fiks Services Ltd | Transport & logistics | 2024 |
| Fil's Food Ltd | Hospitality | 2026 |
| Filand Ltd | Information & communication | 2022 |
| Filda Limited | Construction | 2016 |
| File Nominees Limited | Extraterritorial | 2005 |
| Fileclo UK Limited | Professional & scientific | 2024 |
| Filex Ltd | Information & communication | 2016 |
| Filey Homes Limited | Real estate | 2025 |
| Filgo International Limited | Wholesale & retail | 2009 |
| Filigree Management Limited | Professional & scientific | 2014 |
| Filiparamos Limited | Information & communication | 2015 |
| Filiz Home Delivery Ltd | Hospitality | 2019 |
| Filkin & Co. EHS Limited | Professional & scientific | 2012 |
| Fillet Construction Ltd | Construction | 2016 |
| Filly INK Limited | Health & social care | 2012 |
| Film 32 Ltd | Information & communication | 2024 |
| Film and Television Services Limited | Information & communication | 2009 |
| Film in Language Teaching Association | Education | 2011 |
| Film on the Brain Ltd | Information & communication | 2025 |
| Film Rigging UK Limited | Construction | 2021 |
| Filmdust Limited | Information & communication | 2006 |
| Filmita for Trading Ltd | Wholesale & retail | 2026 |
| Filmora for Contracting Ltd | Wholesale & retail | 2026 |
| FILMS360PRO Ltd | Professional & scientific | 2024 |
| Filorama Ltd | Wholesale & retail | 2025 |
| Filport Properties Limited | Real estate | 2006 |
| Filthy Animal Limited | Manufacturing | 2018 |
| Filthy Friday Ltd | Arts & recreation | 2019 |
| Filuma Garage Doors Limited | Extraterritorial | 2003 |
| Fim-Organic Ltd | Manufacturing | 2024 |
| FIN First Limited | Wholesale & retail | 2022 |
| FIN James Wholesale Limited | Wholesale & retail | 2026 |
| FIN Keen Limited | Households | 1996 |
| FIN Square Capital Limited | Real estate | 2025 |
| Fin-Link Solutions Limited | Information & communication | 2023 |
| Finacc Professional Services Ltd | Professional & scientific | 2022 |
| Finadatametrics Enterprise Limited | Information & communication | 2025 |
| Finadept Ltd | Professional & scientific | 2020 |
| Final Boss Management Ltd | Professional & scientific | 2024 |
| Final Choice Homes Ltd | Real estate | 2024 |
| Final Flourish Limited | Professional & scientific | 2002 |
| Final Third Football Brand Ltd | Administrative & support | 2025 |
| Final Touch Designs Ltd | Construction | 2017 |
| Finalfix Limited | Construction | 2011 |
| Finalstone Ltd | Information & communication | 2021 |
| Finalyze Ltd | Professional & scientific | 2020 |
| Finance Consult Ltd. | Financial services | 2018 |
| Finance Talent Specialists Ltd | Administrative & support | 2023 |
| Finance Transformation Consultancy Limited | Professional & scientific | 2022 |
| Finance Transformation Services Ltd | Other services | 2016 |
| Financecontrol Limited | Hospitality | 1997 |
| Financepilot Ltd | Professional & scientific | 2026 |
| Financial Advisory Limited | Administrative & support | 2023 |
| Financial Agent Accounting Ltd | Professional & scientific | 2025 |
| Financial Agent Solutions Ltd | Financial services | 2022 |
| Financial Applications Consulting Limited | Information & communication | 1998 |
| Financial Brokers Ltd | Professional & scientific | 2011 |
| Financial Claims Helpline Limited | Professional & scientific | 2015 |
| Financial Claims Management Ltd | Financial services | 2015 |
| Financial Dynamics Ltd | Professional & scientific | 2024 |
| Financial Media & Communications Group Ltd | Financial services | 2026 |
| Financial R&R Consulting Ltd | Professional & scientific | 2024 |
| Financial Recovery Solutions Ltd | Financial services | 2008 |
| Financial Retirement Ltd | Financial services | 2024 |
| Financial Services Warehouse Limited | Financial services | 2013 |
| Financial Support Centre Ltd | Financial services | 2018 |
| Financial Support Systems Ltd | Administrative & support | 2017 |