| Fingerprint Estate Planning LLP | | 2016 |
| Fingerprint Financial Planning Ltd | Financial services | 2013 |
| Fingerprint Group Limited | Financial services | 2024 |
| Finnlines UK Limited | Transport & logistics | 1993 |
| Fins Legal Ltd | Professional & scientific | 2025 |
| Fintechgen Limited | Information & communication | 2017 |
| Fioreoluwa Limited | Health & social care | 2018 |
| Fire Global Media Productions Limited | Arts & recreation | 2010 |
| Fireaway Chatham Limited | Hospitality | 2019 |
| Fireaway Wouldham Limited | Hospitality | 2022 |
| Firebelly Media Ltd | Professional & scientific | 2018 |
| Firexpo Ltd | Public administration | 2025 |
| First Call Accommodation Services Limited | Professional & scientific | 2012 |
| First Call Decorating Services Ltd | Construction | 2018 |
| First Call Finance Limited | Financial services | 2000 |
| First Call Mortgage Services Limited | Financial services | 2002 |
| First Choice Print Embroidery Ltd | Manufacturing | 2019 |
| First Citizen Global Project Limited | Real estate | 2024 |
| First Class Healthcare Ltd | Public administration | 2009 |
| First Class Letters Limited | Administrative & support | 2013 |
| First GEN Doctors CIC | Professional & scientific | 2026 |
| First Glaze Ltd | Construction | 2015 |
| First Light Property Group Ltd | Real estate | 2024 |
| First Month Limited | Real estate | 2024 |
| Fish & Coffee Co Ltd | Hospitality | 2011 |
| Fisher Carpentry South East Limited | Construction | 2026 |
| Fitability Limited | Arts & recreation | 2025 |
| Fitzdan UK | Health & social care | 2015 |
| Fitzpatrick Strategy Limited | Professional & scientific | 2024 |
| Fitzs Services UK Ltd | Health & social care | 2025 |
| Fitzwilliam Margot Limited | Real estate | 2025 |
| Five Grace Church | Other services | 2015 |
| Five Longleys Properties Limited | Real estate | 2025 |
| Five Star Trading Ltd | Wholesale & retail | 2025 |
| FIX My Windscreen Ltd | Wholesale & retail | 2024 |
| Fkry Limited | Professional & scientific | 2021 |
| FKS Consultancy Limited | Professional & scientific | 2026 |
| Flair Chef Catering Ltd | Hospitality | 2022 |
| Flame and Frame Limited | Extraterritorial | 2025 |
| Flame Lily Caring Ltd | Health & social care | 2021 |
| Flash BUG Intelligence Ltd | Professional & scientific | 2020 |
| Flavour Hub Foods Ltd | Hospitality | 2025 |
| Flavoursome Trading Ltd | Hospitality | 2023 |
| Flightline Avionics Services Limited | Manufacturing | 2013 |
| Flint Hire and Supply Limited | Other services | 1981 |
| Flints Theatrical Chandlers Limited | Other services | 2018 |
| FLJ Holdings Ltd | Real estate | 2023 |
| FLO & FLO Limited | Arts & recreation | 2025 |
| Flo-Gro Systems Limited | Administrative & support | 2011 |
| Flordeck Industrial Flooring Limited | Construction | 1997 |
| Florencetouch Hair & Beauty Limited | Other services | 2025 |
| Fluent GAS Ltd | Construction | 2022 |
| Flush and Go Drainage Ltd | Construction | 2023 |
| Flux Retail Design Ltd | Professional & scientific | 2024 |
| Fluxifly Ltd | Wholesale & retail | 2025 |
| FLY (FU LAI) Group Ltd | Financial services | 2019 |
| FLY2DIGITAL Ltd | Administrative & support | 2017 |
| FM Investment Properties Limited | Real estate | 2003 |
| FMC Engineering UK Limited | Professional & scientific | 2015 |
| Fndacar Ltd | Administrative & support | 2026 |
| Foam's 4 U Limited | Manufacturing | 2015 |
| Focus Control Systems Ltd | Construction | 2022 |
| Focus Marine Consulting UK Limited | Professional & scientific | 2003 |
| Fogah's Ltd | Hospitality | 2019 |
| Folakemi Ltd | Health & social care | 2022 |
| Foneberry Sterling Group Ltd | Wholesale & retail | 2025 |
| Football '4' ALL Coaching Scheme Ltd | Education | 2018 |
| Footy Autographs Limited | Wholesale & retail | 2018 |
| FOR Great Vocals Limited | Arts & recreation | 2018 |
| Forces Family Finance Ltd. | Financial services | 2015 |
| Ford Centre Limited | Wholesale & retail | 2013 |
| Ford Financial Services Ltd | Financial services | 2024 |
| Fordham SIG Limited | Other services | 2013 |
| Forelake Limited | Arts & recreation | 1963 |
| Forest Rose Tree Surgery Ltd | Agriculture & fishing | 2020 |
| Forestdale Business Services Limited | Wholesale & retail | 1975 |
| Forever in Stones Ltd | Manufacturing | 2024 |
| Forgatti UK Ltd | Wholesale & retail | 2019 |
| Forge Fire & Security Ltd | Public administration | 2023 |
| Forge House Accommodation Solutions CIC | Health & social care | 2025 |
| Forge House Care Ltd | Health & social care | 1998 |
| Forge House Supported Accommodation CIC | Health & social care | 2026 |
| Forlaphem Hope Limited | Other services | 2025 |
| Formation Archaeology Ltd | Professional & scientific | 2012 |
| Formidable Youth Programme Ltd | Education | 2025 |
| Fort Amherst Events & Weddings Limited | Other services | 2012 |
| Fort Amherst Halloween Limited | Arts & recreation | 2013 |
| Fort Amherst Heritage Trust | Arts & recreation | 2002 |
| Fort Horsted Properties Limited | Real estate | 2001 |
| Fort Luton C.I.C. | Education | 2015 |
| Fortified Fronts Limited | Other services | 2011 |
| Fortified Services Limited | Hospitality | 2019 |
| Fortis Masonry Limited | Manufacturing | 2025 |
| Fortis Trust | Education | 2014 |
| Fortitude Construction Limited | Construction | 2019 |
| Fortrise Homes Limited | Administrative & support | 2024 |
| Fortuna SW Consultancy Limited | Hospitality | 2014 |
| Fortunate Homes & Properties Limited | Real estate | 2017 |
| Foulds Brant Developments Limited | Real estate | 2023 |
| Found Properties Ltd | Real estate | 2023 |