| First Central Insurance Management Limited | Financial services | 2008 |
| First Central Services (UK) Limited | Administrative & support | 2006 |
| First Steps Run Club Ltd | Arts & recreation | 2025 |
| Firth (UK) Investments Limited | Real estate | 1994 |
| Fisher Brown Groundworks Limited | Construction | 2016 |
| Fitness Marketing Agency Ltd | Administrative & support | 2015 |
| Fitz Gym Ltd | Arts & recreation | 2021 |
| Fitzgerald Electrical Limited | Administrative & support | 1999 |
| Fitzroy Court (WG) RTM Company Limited | Real estate | 2023 |
| Five Eights Films Ltd | Information & communication | 2022 |
| Five Hearts Events Limited | Arts & recreation | 2025 |
| Fiveways IT Services Limited | Information & communication | 2012 |
| FIX2 Ltd | Construction | 2020 |
| Fizzby Ltd | Professional & scientific | 2026 |
| FJN Growth Solutions Ltd | Professional & scientific | 2023 |
| FJN Limited | Professional & scientific | 2019 |
| FJN Solutions Ltd | Administrative & support | 2014 |
| Flair GC Ltd | Arts & recreation | 2024 |
| Flair Gym Clubs LLP | | 2025 |
| Flat Roofing Tools Limited | Wholesale & retail | 2020 |
| Fletcher Simulator Services Limited | Professional & scientific | 2024 |
| Flexbale Limited | Financial services | 1983 |
| Flight of the Dragonfly Limited | Information & communication | 2025 |
| Flight Profile Limited | Professional & scientific | 2007 |
| Flint Oak Estates Limited | Real estate | 2021 |
| Float Glass Design Limited | Manufacturing | 2007 |
| Float Shoreham Limited | Construction | 2020 |
| Flourish Place Marketing Ltd | Professional & scientific | 2025 |
| Flower & Earth Grows Limited | Agriculture & fishing | 2025 |
| Flower City Limited | Wholesale & retail | 1997 |
| Flowstar Plumbing & Heating Ltd | Construction | 2024 |
| Fluid Physio Ltd. | Health & social care | 2013 |
| Flying Trestles Catering LLP | | 2021 |
| Foeco Limited | Professional & scientific | 2019 |
| Folde Life Limited | Arts & recreation | 2026 |
| Fontomfrom Ltd | Health & social care | 2017 |
| Fore.Sight Golf Ltd | Extraterritorial | 2025 |
| Foreign Natives MC Ltd | Construction | 2004 |
| Forensic Property Finance Limited | Financial services | 2019 |
| Forensic Wills Ltd | Professional & scientific | 2024 |
| Forevanescence Ltd | Arts & recreation | 2025 |
| Forix Property Ltd | Real estate | 2014 |
| Formation Investments Ltd. | Other services | 2012 |
| Forster Consulting Limited | Professional & scientific | 2004 |
| Fortified Business Consulting Limited | Professional & scientific | 2025 |
| Fortuna MT Ltd | Construction | 2017 |
| Foss Initiatives Limited | Professional & scientific | 2005 |
| Fosse Road South Management Co. Limited | Households | 2017 |
| Foster and Allen Property Limited | Construction | 2010 |
| Fountain Woods Ltd | Professional & scientific | 2025 |
| Four Door Properties Ltd | Real estate | 2023 |
| Fourteen Talent Group Ltd | Arts & recreation | 2021 |
| FOX & Setford Ltd | Construction | 2021 |
| FOX Construction South East Ltd | Construction | 2018 |
| FOX Hill Christmas Trees Ltd | Agriculture & fishing | 2012 |
| Foxes & Bears Sports Limited | Arts & recreation | 2025 |
| Foxleigh Holdings Ltd | Information & communication | 2026 |
| Fractal Image Limited | Information & communication | 2019 |
| Frame & Frame LLP | | 2011 |
| Framework Consulting Ltd | Professional & scientific | 2023 |
| Framptons Café Bars (Tunbridge Wells) Limited | Hospitality | 2016 |
| Framptons Café Bars Limited | Hospitality | 2016 |
| Franks Plumbing and Heating Limited | Construction | 2015 |
| Fraserwood Construction Limited | Construction | 2023 |
| Fraybarne Ltd | Real estate | 2011 |
| Freddie Strickland Gardens Limited | Professional & scientific | 2025 |
| Freelance Design & Graphics Ltd | Professional & scientific | 2003 |
| Freelancepod Ltd | Administrative & support | 2021 |
| Freeman Mortgages and Protection Limited | Financial services | 2018 |
| Freemanpage Property Group Ltd | Real estate | 2025 |
| Fremel Construction Ltd | Construction | 2014 |
| Freshfield Lane Brickworks Limited | Manufacturing | 1964 |
| Freshmill Limited | Construction | 2014 |
| Fresno Consulting Ltd | Information & communication | 2014 |
| Friary Meux Limited | Real estate | 2020 |
| Friary, Holroyd & Healy's Breweries Limited | Hospitality | 2021 |
| Frontline Value Creation Limited | Professional & scientific | 2024 |
| Frosty Production Lighting Services Ltd | Construction | 2015 |
| Fruitful Path Learning Ltd | Education | 2026 |
| FRY Facilities Management Limited | Construction | 2022 |
| FRY Maintenance Limited | Real estate | 2008 |
| FSP Homes Ltd | Construction | 2016 |
| FT Carpentry Ltd | Construction | 2012 |
| FT Haywards Ltd | Wholesale & retail | 2021 |
| Fuchsia Promotions Limited | Information & communication | 2024 |
| Fuego Gymnastics Ltd | Education | 2025 |
| Full Circle Farms Sussex Ltd | Agriculture & fishing | 2019 |
| Fuller Timber Limited | Extraterritorial | 1997 |
| Fulucai Solutions Ltd | Administrative & support | 2012 |
| Funmi Limited | Professional & scientific | 2014 |
| Funplex Limited | Arts & recreation | 2005 |
| Fupf Limited | Real estate | 2022 |
| Furnihelp MID Sussex | Water & waste | 2011 |
| Fuse Soccer Limited | Arts & recreation | 2023 |
| Fuse Sports Tours Limited | Arts & recreation | 2023 |
| Fusion Manufacturing Limited | Manufacturing | 2007 |
| Future Fit Leadership Academy Ltd | Professional & scientific | 2012 |
| Futureaccelerated Ltd | Information & communication | 2024 |
| G & G Law Limited | Professional & scientific | 2025 |
| G & W Estates Limited | Real estate | 2016 |