| Fidah Ltd | Real estate | 2025 |
| Fiddlers Camden Ltd | Real estate | 2026 |
| Fidelitas Law Limited | Professional & scientific | 2013 |
| Fidelity Digital Ltd | Information & communication | 2026 |
| Fidmarc Ltd | Transport & logistics | 2023 |
| Fidor Technologies Limited | Information & communication | 2017 |
| Fiducia Properties Ltd | Real estate | 2024 |
| Field & House Limited | Professional & scientific | 2011 |
| Field & Stone Ltd | Hospitality | 2010 |
| Field View Management Company Limited | Households | 2008 |
| Field Works Biodiversity Land Management Ltd | Professional & scientific | 2021 |
| Field&Flame Ltd | Hospitality | 2026 |
| Fieldenful Limited | Health & social care | 2022 |
| Fieldhead Associates Ltd | Education | 2023 |
| Fieldhead Investments Ltd | Administrative & support | 2017 |
| Fieldhurst Investments Limited | Real estate | 2005 |
| Fields & Associates Limited | Administrative & support | 2020 |
| Fields Garden Centre Ltd | Wholesale & retail | 2018 |
| Fieldside View Management Company Limited | Households | 2022 |
| Fiengo Ltd | Health & social care | 2026 |
| Fierce Kaiju Limited | Information & communication | 2014 |
| Fierce Moms Conexus CIC | Other services | 2025 |
| FIF Couriers Limited | Transport & logistics | 2025 |
| Fifa Investments Ltd | Real estate | 2023 |
| Fifteen Delivery Ltd | Wholesale & retail | 2025 |
| Fifteen Eleven Management Ltd | Arts & recreation | 2013 |
| Fifteen Seven Ltd | Professional & scientific | 2025 |
| Fifth Avenue Properties Ltd | Real estate | 2017 |
| Fifty-One Trans Ltd | Transport & logistics | 2017 |
| FIG Tree Investments Ltd | Real estate | 2020 |
| Fight Doctor Promotions Ltd | Health & social care | 2024 |
| Figtine Ltd | Financial services | 2025 |
| Figure Displays Limited | Wholesale & retail | 2021 |
| Figure of Eight Events Limited | Energy | 2013 |
| Figure OUT Limited | Information & communication | 2006 |
| Figures That Matter Ltd | Professional & scientific | 2024 |
| Fihaj Ltd | Wholesale & retail | 2022 |
| Fiip Limited | Financial services | 2025 |
| Fika Consultancy Limited | Professional & scientific | 2021 |
| Fika Interiors Limited | Wholesale & retail | 2017 |
| Fika Warehousing Limited | Real estate | 2006 |
| Fiko's Turkish & Greek Restaurant Ltd | Hospitality | 2020 |
| Fiko’S Mediterranean Kitchen Ltd Ltd | Hospitality | 2018 |
| Filey Bay Beach Holidays Ltd | Real estate | 2021 |
| Fill My Time Limited | Professional & scientific | 2024 |
| Fillerby Limited | Real estate | 2016 |
| Fillyboo the Brand Limited | Wholesale & retail | 2026 |
| Filmon Ltd | Real estate | 2025 |
| Filmon Transport Ltd | Transport & logistics | 2024 |
| Filmore and Union Ltd | Wholesale & retail | 2025 |
| Filoxenos Stegi Ltd | Real estate | 2024 |
| Filrite Limited | Wholesale & retail | 1993 |
| Filtech Solutions Limited | Wholesale & retail | 2023 |
| Filzerbuilders Limited | Construction | 2025 |
| Fimex Direct Ltd | Manufacturing | 2020 |
| Fimtec Builders Ltd | Construction | 2017 |
| Fin-X Consulting Ltd | Professional & scientific | 2025 |
| Fina Consulting Ltd | Professional & scientific | 2021 |
| Final Draft Music Ltd | Information & communication | 2021 |
| Final Idea Limited | Other services | 2009 |
| Finance and Development Corporation Limited | Real estate | 1987 |
| Finance Property Ltd | Financial services | 2022 |
| Finance South West Managers LP | | 2008 |
| Finance Transformation Partners Limited | Professional & scientific | 2022 |
| Financed Ltd | Professional & scientific | 2022 |
| Financial and Direct Accounts LP | | 2021 |
| Financial Core Services Ltd | Financial services | 2018 |
| Financial First Ltd | Other services | 2020 |
| Financial Health Limited | Professional & scientific | 2021 |
| Financial Management Partnership Ltd | Financial services | 2005 |
| Financial Phoenix Academy Ltd | Wholesale & retail | 2026 |
| Financial Systems & Consultancy Ltd. | Information & communication | 1991 |
| Financial Therapeutics UK Ltd | Financial services | 2010 |
| Finblake Ltd | Transport & logistics | 2023 |
| Finc Social Ltd | Professional & scientific | 2024 |
| Fincap Marketing Ltd | Financial services | 2019 |
| Finch House Medical Ltd | Health & social care | 2022 |
| Finch.Blue Ltd | Information & communication | 2023 |
| Finchpark K9 Ltd | Other services | 2018 |
| Finco Collective Ltd | Wholesale & retail | 2025 |
| Find a Home Properties Limited | Real estate | 2023 |
| Find Health Limited | Health & social care | 2026 |
| Find Signage Ltd | Manufacturing | 2009 |
| Finding Therapy Ltd | Health & social care | 2025 |
| Findings Creative Limited | Professional & scientific | 2023 |
| Findlay House Limited | Professional & scientific | 2023 |
| Findlay House Properties Limited | Real estate | 2023 |
| Findley Evans Group Ltd. | Professional & scientific | 2021 |
| Findmycarleeds Limited | Wholesale & retail | 2022 |
| Findrs Recruitment Limited | Administrative & support | 2017 |
| Fine Dining Indian Limited | Administrative & support | 2017 |
| Fine Drive Autocentres Ltd | Manufacturing | 2012 |
| Fine Frames Ltd | Arts & recreation | 2025 |
| Fine Shipments Ltd | Wholesale & retail | 2023 |
| Fine Time Watches Ltd | Wholesale & retail | 2020 |
| Finedoor Crushing and Screening Ltd | Manufacturing | 2021 |
| Fineline Tattoo Studio Ltd | Arts & recreation | 2009 |
| Fineport Limited | Administrative & support | 1992 |
| Finer Interiors Yorkshire Ltd | Construction | 2021 |
| Finer Pleasures Ltd | Manufacturing | 2023 |