| Fast UK Parcel Ltd | Transport & logistics | 2011 |
| Faster Transport Service Limited | Transport & logistics | 2015 |
| Fastmoov Limited | Real estate | 2020 |
| Fastrack Resources Limited | Administrative & support | 2022 |
| FASTVIEW360 (SE) Limited | Manufacturing | 2023 |
| FAT Twins Distribution Limited | Manufacturing | 2019 |
| FAT Twins Franchise Limited | Professional & scientific | 2019 |
| Fatboys 95 Limited | Wholesale & retail | 2004 |
| Father's Financial AID CIC | Health & social care | 2025 |
| Fatimoju Ltd | Information & communication | 2019 |
| Fattehdeux Racing Limited | Construction | 2008 |
| Faustino Constructions Ltd | Construction | 2015 |
| Favela International Ltd | Professional & scientific | 2025 |
| Favor Care Limited | Health & social care | 2016 |
| Favor Company Ltd | Education | 2013 |
| Favour Healthcare Ltd | Health & social care | 2015 |
| Favoureo Ltd. | Health & social care | 2015 |
| Fawcett Shared Area Limited | Real estate | 2025 |
| Fawountants Limited | Professional & scientific | 2024 |
| Fawqah Ltd | Professional & scientific | 2025 |
| Faxxx Only ENT Limited | Information & communication | 2025 |
| Fazed Media Ltd | Professional & scientific | 2024 |
| Fazerz Ltd | Real estate | 2014 |
| Fazh Limited | Professional & scientific | 2004 |
| FAZZ88 Limited | Manufacturing | 2019 |
| FBR Dominion LLP | | 2021 |
| FBT Audio (UK) Limited | Wholesale & retail | 2011 |
| FC Football KIT UK Ltd | Wholesale & retail | 2022 |
| FC Stores Limited | Wholesale & retail | 2023 |
| Fdenterprise Ltd | Wholesale & retail | 2026 |
| FDS Construction Limited | Construction | 2026 |
| Feedback Group Ltd. | Information & communication | 2018 |
| Feeling Good Rbsb Limited | Construction | 2018 |
| Feifan Life International Ltd | Manufacturing | 2025 |
| Felbridge (Caterers) Limited | Hospitality | 2010 |
| Felcos Consultants Limited | Information & communication | 2023 |
| Felix Sun Limited | Wholesale & retail | 2025 |
| Felixstowe Healthcare LLP | | 2012 |
| Femaconstruction Limited | Construction | 2024 |
| Femme Fatale Academy C.I.C. | Manufacturing | 2023 |
| Femme Fatale TV Ltd | Information & communication | 2023 |
| Femz Global Limited | Other services | 2014 |
| FEN Healthcare Limited | Administrative & support | 2022 |
| Fenad Ltd | Administrative & support | 2010 |
| Fence Avenue Management Company Limited | Households | 2003 |
| Fenchurch Group Holding Company Limited | Financial services | 2024 |
| Fenchurch London Market Limited | Financial services | 2024 |
| Fenchurch Star Limited | Administrative & support | 2012 |
| Fening Family Company Ltd | Administrative & support | 2022 |
| Fenmen Place Management Company Limited | Real estate | 2019 |
| Fentecc Ltd | Information & communication | 2022 |
| Fern (George Street) Ltd | Hospitality | 2021 |
| Fern Advisors Limited | Professional & scientific | 2008 |
| Fern Care Services Limited | Other services | 2007 |
| Fern LEA (Badshot LEA) Limited | Households | 2004 |
| Fernbank (Little Lever) Management Company Limited | Households | 2008 |
| Ferndale House (ST Neots) Management Company Limited | Households | 1991 |
| Ferndale House Management Limited | Households | 1977 |
| Fernhill Place (Management) Limited | Households | 1997 |
| Ferosh Limited | Hospitality | 2004 |
| Ferro Polymers UK Ltd | Wholesale & retail | 2021 |
| Fertility in Community Limited | Education | 2013 |
| Fesc Limited | Extraterritorial | 2015 |
| Festick Ltd | Manufacturing | 2025 |
| Fetta DI Pizza Worcester Ltd | Hospitality | 2020 |
| FF Publishing Limited | Information & communication | 2024 |
| FF64 Consulting Ltd | Professional & scientific | 2021 |
| FFF Catering Limited | Hospitality | 2009 |
| FFF Coastal Limited | Hospitality | 2022 |
| FFF South Limited | Hospitality | 2022 |
| Fflow Tech Ltd | Wholesale & retail | 2024 |
| Ffmc Ltd | Wholesale & retail | 2020 |
| Ffml Limited | Financial services | 2025 |
| Ffwd Consultancy Limited | Information & communication | 2012 |
| FGB Consulting Ltd | Information & communication | 2018 |
| Fgcafe Ltd | Hospitality | 2015 |
| FGD Croydon Ltd | Health & social care | 2023 |
| FGH Management Ltd | Households | 2012 |
| FH 102 OA Ltd | Real estate | 2023 |
| FHR Plumbing and Heating Limited | Construction | 2020 |
| Fiat Ltd | Real estate | 2011 |
| Fibre Vision Ltd | Information & communication | 2023 |
| Fiddington Management Company Limited | Households | 2023 |
| Fidelity Residential Ltd | Health & social care | 2014 |
| Fidetrust Investments Limited | Financial services | 2000 |
| Fiduciary Settlements Ltd | Other services | 2012 |
| Field View Whaplode (Management Company) Limited | Households | 2018 |
| Field Way Homes Ltd | Transport & logistics | 2022 |
| Fieldbase Solutions Ltd | Manufacturing | 2025 |
| Fielden Court (Chorlton) Management Limited | Households | 2002 |
| Fieldgate Property Holdings Limited | Real estate | 2021 |
| Fieldsway and Wilmington Residents Management Limited | Households | 1990 |
| Fiesta (UK) Ltd | Hospitality | 2012 |
| Fifth Quadrant Ltd | Financial services | 2010 |
| Fifty 5 Management Company Limited | Households | 2000 |
| Figurative Arts Limited | Wholesale & retail | 2015 |
| Filament Publishing Limited | Information & communication | 1999 |
| Filamu Africa Ltd | Information & communication | 2024 |
| Fildan Ltd | Construction | 2013 |
| Filey Lawn Management Company Limited | Households | 2004 |