| EYE Xcel Limited | Health & social care | 2006 |
| Eyekon Consultants Limited | Administrative & support | 2005 |
| Eyeparts Ltd | Health & social care | 2012 |
| Ezypzy Limited | Professional & scientific | 2000 |
| F. & F. E. Harvey | | 1997 |
| F. Bentley & Co. (Heating and Plumbing) Limited | Construction | 1971 |
| F.4.K. Ltd | Health & social care | 2000 |
| F.H.Brothers & SON Limited | | 1964 |
| F.Ludicke Limited | Real estate | 1948 |
| F.R.B. Strategic Software Limited | Information & communication | 1998 |
| Fairhaven Wholefoods Limited | Wholesale & retail | 1981 |
| Fairmill Properties Limited | Real estate | 2001 |
| Fairmont Management Services Limited | Extraterritorial | 2010 |
| Fairmont Residential Limited | Professional & scientific | 2006 |
| Fairway Apartments Ltd | Real estate | 2016 |
| Falcon Trading Limited | Wholesale & retail | 2004 |
| Family Productions Limited | Professional & scientific | 2003 |
| FAR Grange Park and Golf Club Limited | Hospitality | 1975 |
| Farriers Close Residents Association Limited | Households | 1986 |
| Farsight Media Ltd | Arts & recreation | 2002 |
| Fast Delight Ltd | Hospitality | 2017 |
| FB Tech Ltd | Information & communication | 2023 |
| FBM Online Connections Limited | Professional & scientific | 2013 |
| Felgold Trading Co. Limited | Real estate | 1948 |
| Fembos Group Limited | Hospitality | 2024 |
| Fenabiz Limited | Professional & scientific | 2007 |
| Fencing & Decking Company Ltd | Construction | 2007 |
| Feng Shui Ltd | Other services | 2008 |
| Fernwisp Crafts Ltd | Wholesale & retail | 2025 |
| FFE Limited | Manufacturing | 1974 |
| Fidar Limited | Real estate | 2025 |
| Field & Co Roofing Limited | Construction | 2003 |
| Fieldvale Limited | Hospitality | 1975 |
| Filsons Limited | Administrative & support | 2002 |
| Finchley Lane Car Sales Limited | Administrative & support | 1997 |
| Finesse Associates Limited | Professional & scientific | 2000 |
| Finest Accounts Limited | Professional & scientific | 2004 |
| Finglow Consultants Limited | Professional & scientific | 1986 |
| Finn Marshall Ltd | Information & communication | 2019 |
| Firelight Films Limited | Information & communication | 1999 |
| Fireside Estates Ltd | Real estate | 2016 |
| First Call Media Limited | Information & communication | 2007 |
| First Call Training Ltd | Information & communication | 2001 |
| First National Associates Limited | Construction | 2000 |
| First Unit Caterers Limited | Hospitality | 2006 |
| Firswood Consultancy Services Limited | Administrative & support | 1997 |
| Fisher NG Limited | Professional & scientific | 2002 |
| Fishpools Holdings Limited | Professional & scientific | 2005 |
| Fitnatix Revolution Limited | Arts & recreation | 2019 |
| Flexonics Limited | Professional & scientific | 1993 |
| Fling Promotions Ltd | Wholesale & retail | 1978 |
| Floorworks Limited | Wholesale & retail | 1996 |
| FMJ Investments Ltd | Real estate | 2022 |
| Food Business Development Company Ltd | Professional & scientific | 2003 |
| Foray 989 Limited | Professional & scientific | 1996 |
| Fore Street (Hertford) Management Limited | Households | 1989 |
| Forefront Financial Consultancy Ltd | Professional & scientific | 2014 |
| Forest School Day | Administrative & support | 2018 |
| Forest View (Totton) Management Company Limited | Households | 2026 |
| Forever Clean Ltd. | Administrative & support | 2003 |
| Formbeam Limited | Information & communication | 2004 |
| Formplay Ltd | Administrative & support | 2002 |
| Formula Enterprises Limited | Administrative & support | 1983 |
| Fortune 23 Limited | Transport & logistics | 2022 |
| Forward Design Consultants Limited | Information & communication | 1990 |
| Four Theobald Ltd | Real estate | 2026 |
| Fourcees Investments Limited | Information & communication | 1992 |
| Fourways 4 Business Limited | Professional & scientific | 2007 |
| Fourways Sales and Marketing Limited | Information & communication | 1988 |
| FOURWAYS4PROPERTY Ltd | Real estate | 2007 |
| Fowler Fencing Limited | Other services | 2005 |
| Frampton-Martin Sage Ltd | Professional & scientific | 1993 |
| France One Limited | Real estate | 2003 |
| Frank Taylor & Associates Limited | Real estate | 2000 |
| Franklyn House Management Company Limited | Real estate | 1983 |
| Frattempo Limited | Professional & scientific | 1998 |
| Freedom Weekends Limited | Arts & recreation | 1998 |
| Freespirit Event Management Limited | Administrative & support | 2004 |
| Freeway Construction Limited | Construction | 2005 |
| Friary Lodge Limited | Hospitality | 2006 |
| Friendly Pressure Massage Ltd | Health & social care | 2019 |
| Friends OUT There | Education | 2008 |
| Front Foot Development Limited | Professional & scientific | 2003 |
| Frontier Enterprises Ltd | Real estate | 2003 |
| Frontline States Limited | Information & communication | 1990 |
| Frontline Vehicle Security Limited | Administrative & support | 2002 |
| Fuel Contaminations Limited | Wholesale & retail | 2008 |
| Fuel Stop (UK) Ltd | Extraterritorial | 2002 |
| Full FAT Audio Limited | Manufacturing | 2004 |
| Fundamental Entertainment & TV Limited | Information & communication | 1995 |
| Furlong Bros. (Chingford) Limited | Wholesale & retail | 1973 |
| Fusion Restaurant Limited | Hospitality | 1999 |
| G & D Groundworks Limited | Construction | 1998 |
| G & D Plant Hire Limited | Construction | 1991 |
| G & E Properties Limited | Hospitality | 2002 |
| G a Architectural Limited | Real estate | 1991 |
| G B Electrical Limited | Construction | 2002 |
| G C M a London Ltd | Wholesale & retail | 2024 |
| G Carini Limited | Professional & scientific | 2002 |
| G Morris Developments Limited | Construction | 2003 |