| Faron Estates Ltd | Real estate | 2023 |
| Faron.Co Ltd | Construction | 2004 |
| Farrah Madhoo Limited | Health & social care | 2014 |
| Farrell & Co Accountants Limited | Professional & scientific | 2013 |
| Farrell Property Ltd | Real estate | 2020 |
| Farriers Court (Easebourne) Management Company Limited | Households | 2023 |
| Farriers Court Management Limited | Households | 1970 |
| Farringdon AF Ltd | Financial services | 2022 |
| Fast Food Bros Trading Limited | Construction | 2022 |
| Fast Post Way Ltd | Transport & logistics | 2025 |
| FAST4EVENTS Ltd | Administrative & support | 2023 |
| Fastenersdirect Limited | Wholesale & retail | 2021 |
| Fastex Group Limited | Transport & logistics | 2023 |
| Fauna & Friends Ltd | Manufacturing | 2020 |
| Fbh-Fichet Limited | Wholesale & retail | 1969 |
| FCL Services Ltd | Administrative & support | 2021 |
| FD Ocean Ltd | Hospitality | 2023 |
| Fearless Facebook ADS Ltd | Professional & scientific | 2023 |
| Febrile Rolly Limited | Wholesale & retail | 2026 |
| Feel Electric T/A Graces Personal Training Ltd | Health & social care | 2025 |
| Feel Your Flow Apparel Limited | Wholesale & retail | 2016 |
| Felden Holdings Ltd | Financial services | 2025 |
| Felden Productions Ltd | Administrative & support | 2017 |
| Feldenhurst Limited | Households | 2004 |
| Fellows Gardens Management Limited | Construction | 2014 |
| Fellows Research Centre Ltd | Professional & scientific | 2018 |
| Felogram Management Limited | Construction | 2013 |
| Femina Wellness Limited | Health & social care | 2024 |
| Femini Management Limited | Professional & scientific | 2024 |
| FEN Meadow (Nursling) Management Company Limited | Households | 2017 |
| Fenagh Surveying Services Limited | Professional & scientific | 2007 |
| Fenning London Ltd | Professional & scientific | 2019 |
| Ferox Financial Limited | Professional & scientific | 2021 |
| Festac Property Ltd | Real estate | 2025 |
| FG Building Ltd | Construction | 2022 |
| FH LDN Limited | Professional & scientific | 2024 |
| Fiao Properties Ltd | Real estate | 2020 |
| Field Lodge (Freehold) Limited | Households | 2012 |
| Fielder Environmental Geotechnics Limited | Administrative & support | 1993 |
| Fields END Farming LLP | | 2013 |
| Fieldsend Limited | Professional & scientific | 2017 |
| Fifers Lane (Orchard Place) Management Company Limited | Households | 2012 |
| Fifth Season Limited | Professional & scientific | 2015 |
| Fifth Software Limited | Professional & scientific | 1996 |
| FIFTY-5 Hair Ltd | Other services | 2018 |
| Fighting Robots Limited | Other services | 2002 |
| Fikinghax Mobile Car Wash Limited | Administrative & support | 2021 |
| Filigrillz Ltd | Hospitality | 2019 |
| Fill & Flow Ltd | Professional & scientific | 2015 |
| Film Béduer Limited | Information & communication | 2019 |
| Filosabi Limited | Transport & logistics | 2022 |
| Financial Match Services Limited | Wholesale & retail | 2017 |
| Fincomp Services Limited | Administrative & support | 2003 |
| Fine Pruning Tree Surgery Ltd | Agriculture & fishing | 2024 |
| Fineline Inc Limited | Hospitality | 2023 |
| Finer Line Limited | Health & social care | 2014 |
| Finest for Baby Agencies Ltd | Wholesale & retail | 2016 |
| Finestay Maintenance Ltd | Administrative & support | 2022 |
| Fingerprints Education | Education | 2011 |
| Fingleton White Ltd | Professional & scientific | 2021 |
| Finks Enterprises Ltd | Information & communication | 2010 |
| Finspect Ltd | Professional & scientific | 2018 |
| Fio's Store Ltd | Wholesale & retail | 2023 |
| FIR Grove (Burnley) Management Company Limited | Households | 2005 |
| Fircon Ltd | Construction | 2022 |
| Fircroft Court (Woking) Limited | Households | 1968 |
| Fire Protection Technologies Ltd | Public administration | 2023 |
| Firebird Coaching & Consultancy Ltd | Professional & scientific | 2012 |
| Fireburst Fireworks Limited | Wholesale & retail | 2009 |
| Firecrest Business Solutions Limited | Professional & scientific | 2011 |
| Firs Residents Society Limited(The) | Households | 1985 |
| First Central Residents Management Company Limited | Households | 2006 |
| First Coders Ltd | Information & communication | 2009 |
| First Commercial Consultancy Limited | Information & communication | 1997 |
| First Construct Ltd | Administrative & support | 2016 |
| First Investment Property Ltd | Real estate | 2025 |
| First Line IT Limited | Information & communication | 2001 |
| First Line Telecoms Ltd | Information & communication | 2002 |
| First Link Management Services Ltd | Professional & scientific | 2006 |
| First Responders Ltd. | Education | 1989 |
| First Stop Hemel Hempstead Limited | Wholesale & retail | 2025 |
| First Stop Hemel Limited | Wholesale & retail | 2025 |
| First Strata Limited | Real estate | 2004 |
| Firstcall Maintenance Ltd | Construction | 2025 |
| Firstlight Tutors Limited | Education | 2011 |
| Firstline Pharma Ltd | Wholesale & retail | 2012 |
| Fit Team Limited | Health & social care | 2017 |
| Fitsolutions Ltd | Wholesale & retail | 2003 |
| Five Nevern Square Limited | Households | 1994 |
| Fiveola (Manchester) Limited | Professional & scientific | 2017 |
| Fixnow Mechanics Ltd | Professional & scientific | 2026 |
| Fixra Limited | Wholesale & retail | 2022 |
| FJS Solutions Limited | Professional & scientific | 2024 |
| Flagstone Consulting Ltd | Information & communication | 2025 |
| Flair Stairs Limited | Construction | 2014 |
| Flamborough Holidays Limited | Hospitality | 1965 |
| Flame Fighter Limited | Wholesale & retail | 2024 |
| Flame Public Relations Limited | Professional & scientific | 2004 |
| Flame Red Technology Limited | Administrative & support | 2016 |
| Flame Wood Fired Catering Limited | Hospitality | 2015 |