| Expert Paediatrics Limited | Health & social care | 2025 |
| Expressarte Ltd | Other services | 2020 |
| Exquisite Bites Ltd | Hospitality | 2023 |
| Extempo Consulting Ltd | Professional & scientific | 2020 |
| Extrusion & Moulding Compounds Limited | Manufacturing | 1967 |
| EYE4EYE Ltd | Wholesale & retail | 2022 |
| F & R Cawley Limited | Water & waste | 2001 |
| F C Expansion Ltd | Construction | 2021 |
| F E Scenic Painting & Finishes Ltd | Construction | 2024 |
| F M Engineering International Limited | Professional & scientific | 1996 |
| F M S Facilities Management Services Ltd | Administrative & support | 1995 |
| F T E Autos Limited | Wholesale & retail | 2015 |
| F T E Investments Limited | Real estate | 2020 |
| F. Losel Catering Limited | Financial services | 1983 |
| F.& C.Electric Limited | Professional & scientific | 1963 |
| F.C. Precast Concrete Limited | Professional & scientific | 1967 |
| F.M. Insurance Company Limited | Administrative & support | 1963 |
| F.T. Ridgley (Builders) Limited | Extraterritorial | 1972 |
| FA (Ckaf) Ltd | Hospitality | 2021 |
| Fadeo'Clock Barber Shop Ltd | Other services | 2024 |
| Fado 519 Limited | Professional & scientific | 2011 |
| Fahmy Ltd | Administrative & support | 2007 |
| Fair Facility Ltd | Professional & scientific | 2012 |
| Fair Wear and Tear Limited | Administrative & support | 2007 |
| Fairstar Limited | Administrative & support | 2007 |
| Faisal Ecommers Limited | Wholesale & retail | 2024 |
| Famecake Ltd | Information & communication | 2026 |
| FAR and Away CIC | Transport & logistics | 2023 |
| Farm Drones UK Ltd | Agriculture & fishing | 2023 |
| Farmhouse Maidenhead Limited | Hospitality | 2022 |
| Farncombe Smith 1990 Ltd. | Construction | 1991 |
| Farnham Martial Arts Ltd | Arts & recreation | 2021 |
| Farrago Productions Ltd | Administrative & support | 2010 |
| Farrell Electrical Limited | Construction | 2005 |
| Fast and Classic Limited | Wholesale & retail | 2017 |
| Fastener Direct Limited | Wholesale & retail | 1999 |
| FAT Fish Caterers Limited | Hospitality | 2004 |
| Fathom Management Solutions Limited | Information & communication | 2013 |
| Fathy Muhammad Group (FMG) UK Limited | Wholesale & retail | 2026 |
| Fawsley Partners Limited | Construction | 2023 |
| Faye Wessely Limited | Information & communication | 2017 |
| FB Carpentry Build Ltd | Construction | 2023 |
| FC Pilates Ltd | Arts & recreation | 2025 |
| FCF Wellbeing Ltd | Arts & recreation | 2025 |
| FD Cleaning Services Ltd | Other services | 2009 |
| FD Experimental Kitchen Limited | Administrative & support | 2006 |
| FD Property Developers Ltd | Real estate | 2017 |
| FD4 Limited | Professional & scientific | 2012 |
| Feast Event Catering Ltd | Hospitality | 2019 |
| Feast of Fools Ltd | Information & communication | 2026 |
| Feastrove Ltd | Hospitality | 2024 |
| Fedelsoft Ltd | Information & communication | 2022 |
| Feedbaq Technologies Limited | Information & communication | 2026 |
| Feeromi Associates Ltd | Professional & scientific | 2024 |
| Felicity Cobbold Veterinary Surgeons Limited | Professional & scientific | 2025 |
| Felix & Co. Accountants Limited | Professional & scientific | 2009 |
| Femtosoft Ltd | Construction | 2023 |
| Fenchurch Estates Limited | Administrative & support | 1992 |
| Fern & Co Accountants Limited | Professional & scientific | 2006 |
| Fern and Birch Services Ltd | Professional & scientific | 2024 |
| Fern Haus Ltd | Construction | 2018 |
| Ferrersand Aggregates Limited | Professional & scientific | 1953 |
| FHQ Contract Services Limited | Professional & scientific | 2015 |
| Fibervis Ltd | Manufacturing | 2022 |
| Fiennes Healthcare Ltd | Health & social care | 2017 |
| Fightlab Limited | Wholesale & retail | 2016 |
| Fileturn Limited | Administrative & support | 1998 |
| FIN and Farm Limited | Hospitality | 2009 |
| Financial Transformations Ltd | Professional & scientific | 2017 |
| Finative Ltd | Professional & scientific | 2023 |
| Find Health Freedom Ltd | Health & social care | 2025 |
| Find YOU First Limited | Information & communication | 2011 |
| Finest Garden Solutions Ltd | Administrative & support | 2024 |
| Finforecast Ltd | Information & communication | 2025 |
| Finogen Consulting Limited | Information & communication | 2017 |
| Finpilot Advisors Ltd | Professional & scientific | 2026 |
| Fiona Walker England Limited | Wholesale & retail | 2014 |
| Fire and Rescue NW Holdings Limited | Financial services | 2010 |
| Fire and Rescue NW Intermediate Limited | Financial services | 2010 |
| Fire and Rescue NW Limited | Construction | 2010 |
| Fire Support (Ssfr) Holdings Limited | Financial services | 2009 |
| Fire Support (Ssfr) Limited | Financial services | 2009 |
| Fire Technology Limited | Construction | 2016 |
| Fireeyes Security Ltd | Administrative & support | 2024 |
| Firehorse Catering Limited | Hospitality | 2016 |
| First AID Angels Limited | Education | 2008 |
| First Artists Royalties Limited | Information & communication | 2018 |
| First Buy Motors Limited | Wholesale & retail | 2020 |
| First Choice Facilities Services Limited | Administrative & support | 1992 |
| First Choice Storage Limited | Transport & logistics | 2018 |
| First Equity Housing Limited | Real estate | 2012 |
| First Flight Ltd | Real estate | 2006 |
| First Footprint Properties Ltd | Real estate | 2018 |
| First for Vintage Limited | Wholesale & retail | 2023 |
| First Life Learning Limited | Professional & scientific | 2001 |
| First Middlegate Limited | Information & communication | 2017 |
| Firstrapid Residents Management Limited | Extraterritorial | 1987 |
| Fisher & Paykel Healthcare Limited | Health & social care | 1994 |
| Fishing 2 U Limited | Wholesale & retail | 2018 |
| Fishub Ltd | Arts & recreation | 2025 |