| Fauna Veterinary Ltd | Professional & scientific | 2021 |
| Fazco Limited | Professional & scientific | 2010 |
| FC Obrien Ltd | Construction | 2021 |
| FDS4SMES Ltd | Professional & scientific | 2018 |
| Feathers Lifestyle Ltd | Administrative & support | 2016 |
| Feathers Motor Sport Ltd | Arts & recreation | 2013 |
| Feature Consultancy Limited | Professional & scientific | 2013 |
| Ferndown Holdings Ltd | Real estate | 2024 |
| Ferry Inn (Isle of Oxney) Limited | Construction | 1999 |
| Fetlock & Saddle Limited | Real estate | 2023 |
| Fifty Avenue Management Ltd | Households | 2016 |
| Filipe Pinheiro Ltd | Administrative & support | 2018 |
| Finaacom International Limited | Administrative & support | 2009 |
| Finaacom Limited | Administrative & support | 2021 |
| Final Image Limited | Information & communication | 2009 |
| Finance Transformations Ltd | Professional & scientific | 2016 |
| Financial Freedom FX Ltd | Information & communication | 2023 |
| Finawis Consultants Limited | Professional & scientific | 2025 |
| Finawis Limited | Professional & scientific | 2021 |
| Fine Plot Limited | Real estate | 2026 |
| Finemott Limited | Real estate | 1979 |
| Fingrow Ltd | Financial services | 2026 |
| Finserva Ltd | Information & communication | 2024 |
| Fintelligenx Ltd | Information & communication | 2023 |
| First Security Training Limited | Education | 2023 |
| Fiscalc Limited | Professional & scientific | 2024 |
| Fisheries Inn Angling Society Limited | Arts & recreation | 2020 |
| Fit.Stream Limited | Other services | 2021 |
| Fitbymo Limited | Arts & recreation | 2024 |
| Fitness Pledge Ltd | Health & social care | 2023 |
| Fits Consultancy Limited | Professional & scientific | 2009 |
| Fitter for Purpose Ltd | Professional & scientific | 2022 |
| Five Care Ltd | Extraterritorial | 2023 |
| FIX UP Construction Ltd | Administrative & support | 2025 |
| Flairtown Limited | Real estate | 1984 |
| Flannery Business Services Limited | Professional & scientific | 2026 |
| Flannery Ennis House (Irlam) Limited | Real estate | 2026 |
| Flannery Hire Limited | Construction | 2012 |
| Flannery Holdings Limited | Financial services | 2023 |
| Flannery Plant Hire Limited | Construction | 2012 |
| Flannery Properties (Aylesbury) Limited | Real estate | 2026 |
| Flannery Properties (Darlington) Limited | Real estate | 2025 |
| Flannery Properties (Fifth Way) Limited | Real estate | 2026 |
| Flannery Properties (Gerrards Cross) Limited | Real estate | 2026 |
| Flannery Properties (High Wycombe) Limited | Real estate | 2026 |
| Flannery Properties (Inverness) Limited | Real estate | 2025 |
| Flannery Properties (Ipswich) Limited | Real estate | 2024 |
| Flannery Properties (Nottingham) Limited | Real estate | 2025 |
| Flannery Properties (Ruislip) Limited | Real estate | 2024 |
| Flannery Properties (Speke) Limited | Real estate | 2025 |
| Flannery Properties (Warrington) Limited | Real estate | 2024 |
| Flannery Properties Limited | Real estate | 2021 |
| Flats 1-5 135 Pinner Road Management Company Limited | Real estate | 2004 |
| Flatsatprestonroad Limited | Real estate | 2017 |
| FLB1 Limited | Construction | 2025 |
| FLB2 Limited | Transport & logistics | 2025 |
| FLEX2FLY Ltd | Information & communication | 2017 |
| Floralmarcela Limited | Wholesale & retail | 2023 |
| Florence Court (Northwood) Residents Association Limited | Households | 1989 |
| Flourish HR Limited | Administrative & support | 2015 |
| Flowstone Estates Ltd | Real estate | 2025 |
| FMB Live Ltd | Real estate | 2019 |
| FMS Mobility Limited | Administrative & support | 2019 |
| FMV Mechanical Ltd | Construction | 2025 |
| Foam & Bubbles Ltd | Wholesale & retail | 2015 |
| Fog-Wash Limited | Water & waste | 2022 |
| Food for the Seasons Limited | Hospitality | 2023 |
| Forest Care Holdings Limited | Real estate | 2025 |
| Forest Court Care Limited | Health & social care | 2018 |
| Forever Entertainment Limited | Wholesale & retail | 2018 |
| Foria Limited | Health & social care | 2010 |
| FORTUNA4ME Ltd | Financial services | 2024 |
| Forty Hillside Consulting Tech Limited | Information & communication | 2026 |
| Forum for Mind Limited | Health & social care | 2023 |
| Forum Insurance Services Limited | Financial services | 2008 |
| Four Turtles Limited | Real estate | 2022 |
| Foxhill Northwood Ltd | Real estate | 2019 |
| Foxridge Homes Limited | Real estate | 2017 |
| Franklin Percival Ltd | Professional & scientific | 2025 |
| Franks Way Management Limited | Households | 2007 |
| Free Soul Books Ltd | Professional & scientific | 2020 |
| Freecloud Development Ltd | Construction | 2021 |
| Freecloud Limited | Real estate | 1984 |
| Freehold of 13&13A Grainger Road Ltd | Extraterritorial | 2014 |
| Fresh Tech Recruitment Ltd | Administrative & support | 2023 |
| Fresnel Evergreen Limited | Information & communication | 2013 |
| Friends Estate Agents Limited | Real estate | 2000 |
| Friends of LEO Baeck Haifa | Other services | 2010 |
| Frith Grange Residents Association Limited | Real estate | 1984 |
| Fuggire Ltd | Professional & scientific | 2016 |
| Fulham Meats Limited | Wholesale & retail | 2012 |
| Full of Enfys Productions Limited | Information & communication | 2022 |
| Funtastik Studios Limited | Information & communication | 2022 |
| Fusion Sensations Limited | Hospitality | 2022 |
| Fusioncloud Consulting Ltd | Information & communication | 2012 |
| Fusiontint Limited | Real estate | 2003 |
| Future Car Credit Ltd | Financial services | 2021 |
| Future Stars Coaching Bucks Ltd | Arts & recreation | 2025 |
| Fuzzbox Design Ltd | Professional & scientific | 2011 |
| Fvture Ltd | Professional & scientific | 2026 |