| Executive Performance Consultancy Limited | Professional & scientific | 2024 |
| Exotic Gems Limited | Wholesale & retail | 2020 |
| Expansion Heating Limited | Construction | 2017 |
| Expatux Limited | Information & communication | 2020 |
| Experia Management Services Limited | Professional & scientific | 2012 |
| Experiment Design Limited | Professional & scientific | 2025 |
| Exploaded Media Group Ltd | Information & communication | 2026 |
| Exsen Limited | Transport & logistics | 2003 |
| EY Communications Limited | Other services | 2022 |
| EY Group Limited | Financial services | 2015 |
| Eye-D Ltd | Professional & scientific | 2019 |
| Eyepower Limited | Manufacturing | 2020 |
| F & F Catering Limited | Hospitality | 2020 |
| F & F Foods Ltd | Hospitality | 2015 |
| F Burgoyne Limited | Agriculture & fishing | 2025 |
| F C G Nightingale Limited | Wholesale & retail | 2014 |
| F H G Software Limited | Information & communication | 2002 |
| F Smith & SON (Croydon) Ltd | Transport & logistics | 2004 |
| F&A BSL Limited | Administrative & support | 2013 |
| F. Snowdon Limited | Professional & scientific | 2018 |
| F.I.Burgoyne Limited | Wholesale & retail | 2024 |
| F.J. Contracting Ltd | Administrative & support | 2025 |
| F.R.Gainsbury Limited | Professional & scientific | 2018 |
| FAB Architects Ltd | Professional & scientific | 2021 |
| Fable & Bloom Ltd | Wholesale & retail | 2025 |
| Fabmoto Limited | Administrative & support | 2020 |
| Fabspeed Holdings Ltd | Professional & scientific | 2021 |
| Fabspeed UK Limited | Manufacturing | 2020 |
| Facial Aesthetics Centre Limited | Other services | 2024 |
| Facilitas Recruitment Limited | Administrative & support | 2015 |
| Fair Valley Holdings Ltd | Real estate | 2023 |
| Fairfax (Reading) Limited | Real estate | 2018 |
| Fairfax (Rottingdean) LLP | | 2019 |
| Fairfax (Somerton) Limited | Real estate | 2018 |
| Fairfax Acquisitions (Haywards Heath) Limited | Construction | 2016 |
| Fairfax Acquisitions (Newick) Limited | Construction | 2024 |
| Fairfax Acquisitions Limited | Construction | 2004 |
| Fairfax Aspire Limited | Real estate | 2016 |
| Fairfax Classical Properties Limited | Construction | 2003 |
| Fairfax Group Holdings Limited | Financial services | 2017 |
| Fairfax Land Acquisitions Limited | Real estate | 2013 |
| Fairfax Land Ventures Limited | Real estate | 2021 |
| Fairfax Real Estate Limited | Real estate | 2018 |
| Fairfax Strategic Land (Hemel) Limited | Real estate | 2018 |
| Familton Construction Limited | Construction | 2018 |
| Fanel Construction Ltd | Construction | 2017 |
| Fantasy 4 Ball Ltd | Information & communication | 2025 |
| Fantasy Club Cricket Limited | Arts & recreation | 2015 |
| Fanthorp 1 Ltd | Real estate | 2005 |
| FAR Brighton Ltd | Hospitality | 2023 |
| Farleigh Investments Limited | Professional & scientific | 2018 |
| Farm, Field & Forest Ltd | Wholesale & retail | 2015 |
| Farmhealth.Com Limited | Professional & scientific | 1994 |
| FAS Capital Limited | Administrative & support | 1997 |
| Fastr Charging Limited | Professional & scientific | 2024 |
| Fathom XP Ltd | Information & communication | 2012 |
| FBC Consulting Limited | Administrative & support | 2020 |
| FBW Flight Training Limited | Professional & scientific | 2015 |
| FCP Land 3 Limited | Real estate | 2017 |
| FCP Land 4 Limited | Real estate | 2018 |
| Fdfoods Ltd | Hospitality | 2025 |
| FDI Secretaries Ltd | Professional & scientific | 2009 |
| Fear Fest Events Ltd | Administrative & support | 2026 |
| Feathers and Quills Ltd | Manufacturing | 2009 |
| Fecundity Ventures Ltd | Professional & scientific | 2012 |
| Feel Secure Limited | Extraterritorial | 2021 |
| Fehners Software 1 LLP | | 2011 |
| Fehners Software Ltd. | Information & communication | 2014 |
| Fences Limited | Administrative & support | 2004 |
| Fenton Property Consultants Limited | Professional & scientific | 2012 |
| Feraland Limited | Construction | 2020 |
| Ferguson Building Services Limited | Construction | 1995 |
| Fernando Property Holdings Limited | Hospitality | 2021 |
| Fforest Marketing Limited | Professional & scientific | 2023 |
| Fieldmark Engineering Limited | Information & communication | 2000 |
| Fill Good Ltd | Wholesale & retail | 2019 |
| Final Destination Limited | Administrative & support | 2005 |
| Finance Planning Mortgage Promise Limited | Administrative & support | 2003 |
| Finance Planning Mortgage Solutions Limited | Administrative & support | 2003 |
| Finance Planning Surveying Services Limited | Administrative & support | 2002 |
| Finance Planning Wealth Limited | Administrative & support | 2025 |
| Financial Consulting Sussex Limited | Information & communication | 2010 |
| Fine Furnishings (Sussex) Ltd | Wholesale & retail | 2013 |
| Fingerprint Compliance Holdings Ltd | Administrative & support | 2016 |
| Fingerprint Compliance Services Ltd | Administrative & support | 2016 |
| Finishing Touches Clinics Ltd | Other services | 2015 |
| Finishing Touches Portfolio Ltd | Other services | 1997 |
| Finn Technologies LLP | | 2019 |
| Fintan Projects Limited | Construction | 2016 |
| Fintexis Ltd | Professional & scientific | 2024 |
| Fiona Mcbride Consulting Ltd | Professional & scientific | 2014 |
| Fiorentini & Baker London Ltd | Wholesale & retail | 2009 |
| Fiorentini Baker Associates Limited | Professional & scientific | 1998 |
| FIR Group Ltd | Hospitality | 2026 |
| Firebox Investments Ltd | Professional & scientific | 2013 |
| Firlands Residents Association Limited | Extraterritorial | 2009 |
| Firle Watches Limited | Manufacturing | 2020 |
| Firman Property Group Limited | Administrative & support | 2013 |
| First Call Financial Solutions Limited | Financial services | 2005 |
| First Call Property Management Limited | Real estate | 2020 |