| Feurtados Limited | Other services | 2009 |
| Fewd Limited | Wholesale & retail | 1987 |
| FG Basildon Ltd | Wholesale & retail | 2024 |
| FG CD1 Ltd | Wholesale & retail | 2024 |
| FG CD2 Ltd | Wholesale & retail | 2024 |
| FG Christie Limited | Construction | 2022 |
| FG Derby Ltd | Wholesale & retail | 2024 |
| FG Doncaster Ltd | Wholesale & retail | 2024 |
| FG Hedgend Ltd | Wholesale & retail | 2024 |
| FG Hull Ltd | Wholesale & retail | 2024 |
| FG Merthyr Ltd | Wholesale & retail | 2024 |
| FG Nottingham Ltd | Wholesale & retail | 2024 |
| FG Online Ltd | Wholesale & retail | 2025 |
| FG Swansea Ltd | Wholesale & retail | 2024 |
| FGI Management Limited | Real estate | 2015 |
| FGI Project 25 Limited | Construction | 2025 |
| FH Heating Services Ltd | Construction | 2025 |
| FH2025 Limited | Hospitality | 2025 |
| FHG Shields Ltd | Real estate | 2004 |
| Fhst Limited | Construction | 2022 |
| Fiarra Studios Ltd | Professional & scientific | 2025 |
| Fideles DEI Ltd | Wholesale & retail | 2026 |
| Fidelity Property Limited | Real estate | 2025 |
| Fidelity Store Ltd | Wholesale & retail | 2017 |
| Fidelity Vantage Homes Ltd | Real estate | 2025 |
| Field Building Maintenance Ltd | Wholesale & retail | 1991 |
| Field Lane Care & Resources Ltd | Health & social care | 2026 |
| Field Lane Playgroup Limited | Education | 2004 |
| Field Sport UK Ltd | Extraterritorial | 2015 |
| Field Street Corner Limited | Real estate | 2019 |
| Fieldhive Ltd | Information & communication | 2025 |
| Fieldwork Facilitation Ltd. | Professional & scientific | 2018 |
| Fieldz Limited | Wholesale & retail | 2020 |
| Fife Lamp Barbers Ltd | Other services | 2026 |
| Fifi's Pet Aquatic & Wildlife Supplies Ltd | Wholesale & retail | 2026 |
| Fifty Nine Financial Limited | Financial services | 2009 |
| Fifty Three Estates Limited | Real estate | 2023 |
| Fifty Three Holdings Limited | Real estate | 2023 |
| Fightback Promotions Limited | Education | 2023 |
| Figtree Two Limited | Professional & scientific | 2012 |
| Fiit for Life Education Limited | Education | 2020 |
| File.Constructs Limited | Construction | 2025 |
| Filey Bay Caravans Limited | Hospitality | 2022 |
| Filip's Car Wash and Valeting Detail Service Ltd | Administrative & support | 2026 |
| Fillingham Poultry Ltd | Agriculture & fishing | 2020 |
| Film City Production Agency Limited | Information & communication | 2006 |
| Film Industry Gear Limited | Information & communication | 2016 |
| Filmflix Limited | Information & communication | 2023 |
| Filmlabworks Limited | Information & communication | 2025 |
| Filtrans 1 Ltd | Transport & logistics | 2018 |
| Fimbit Technology Ltd | Information & communication | 2026 |
| Fimdha Holdings Limited | Financial services | 2017 |
| Finaf Stores Ltd | Wholesale & retail | 2021 |
| Final Signs Ltd | Manufacturing | 2026 |
| Final Stock Limited | Wholesale & retail | 2025 |
| Finale' Thai Tapas Ltd | Hospitality | 2011 |
| Finance Advice Centre Ltd | Financial services | 2014 |
| Finance Advice Group Ltd | Financial services | 2014 |
| Finance Alternatives Ltd | Real estate | 2011 |
| Financial Freedom for Life Ltd | Financial services | 2005 |
| Financial Modelling Solutions Limited | Information & communication | 2012 |
| Financial Partners Consultancy Limited | Financial services | 2019 |
| Financial Talk Limited | Extraterritorial | 2000 |
| Fincara Investments Limited | Wholesale & retail | 2006 |
| Fincoa Accountants Limited | Professional & scientific | 2025 |
| Find & Form Ltd | Professional & scientific | 2021 |
| Find Accommodation Limited | Hospitality | 2019 |
| Find Coffee Bar Limited | Hospitality | 2026 |
| Find Findern Ltd | Hospitality | 2021 |
| Find the Right Mortgage Ltd | Financial services | 2017 |
| Findern Stores Ltd. | Wholesale & retail | 2013 |
| Findmi Digital Limited | Professional & scientific | 2021 |
| Findmi Ltd | Other services | 2019 |
| Fine Properties Derby Limited | Real estate | 2025 |
| Fine Supplements Limited | Wholesale & retail | 2018 |
| Fine Supplies Limited | Wholesale & retail | 2018 |
| Finetouch Care Agency Limited | Health & social care | 2021 |
| Finetouch Unisex Hair & Beauty Salon Limited | Other services | 2024 |
| Finewood Studios (Furniture) Limited | Wholesale & retail | 1976 |
| Fingenius Limited | Information & communication | 2014 |
| Finishing Perfection Services Ltd | Manufacturing | 2018 |
| Finley & Partners Limited | Real estate | 2020 |
| Finley Harrison Architectural Services Limited | Professional & scientific | 2013 |
| Finleyharrison Developments Ltd | Real estate | 2017 |
| Finnemore Consulting Limited | Professional & scientific | 2018 |
| Fintech Accountants Ltd | Information & communication | 2025 |
| Fintech Global Network Ltd | Information & communication | 2020 |
| Finxtra Technologies Ltd | Professional & scientific | 2020 |
| Firbank Estate Management Limited | Households | 2019 |
| Fire Barrier International Ltd | Construction | 2018 |
| Fire Builders Community Interest Company | Health & social care | 2024 |
| Fire Design Guardian (FDG) Ltd | Professional & scientific | 2026 |
| Fire Detection Shop Limited | Extraterritorial | 2020 |
| Fire Protection Shop Limited | Professional & scientific | 2008 |
| Fire Safety Store Limited | Extraterritorial | 2020 |
| Fire Security Systems Integrated Ltd | Administrative & support | 2026 |
| Firebird Cafe & Catering Limited | Hospitality | 2025 |
| Firecatcher LLP | | 2006 |
| Fireguard PFS Ltd | Construction | 2023 |
| Firehold Ltd | Construction | 2025 |