| E11VEN Ltd | Real estate | 2015 |
| Eadye Investments Limited | | 1972 |
| Eaglestone Construction Limited | | 1988 |
| EBA Limited | Professional & scientific | 2002 |
| Eco UK Merchant Ltd | Wholesale & retail | 2017 |
| ECR Global Limited | Administrative & support | 1999 |
| Edgware & Kingsbury FC Ltd | Arts & recreation | 2014 |
| EGO Property LLP | | 2026 |
| EIG & Co | | 2001 |
| El-Shaddai Healthcare Limited | Health & social care | 2025 |
| ELM Green Training Limited | Administrative & support | 2000 |
| Elmbank Coaching Ltd | Professional & scientific | 2014 |
| Embassy Machinery Limited | Manufacturing | 1967 |
| Emerald Beauty & Health Ltd | Other services | 2023 |
| Emery Computing Services Limited | Information & communication | 1991 |
| Eminent Networks Limited | Information & communication | 2020 |
| England Properties Limited | Professional & scientific | 2004 |
| Enhance Beauty & Skin Limited | Other services | 2025 |
| Enis Borehamwood Ltd | Hospitality | 2015 |
| Entitled Productions Ltd | Information & communication | 2008 |
| Equilibrium Business Ltd | Real estate | 2022 |
| Essendon Property Ventures Limited | Real estate | 2011 |
| Essk Media Ltd | Professional & scientific | 2017 |
| Estuary Electrical Limited | Construction | 2003 |
| Etheralis Bioai Ltd | Information & communication | 2025 |
| Etritech Ltd | Professional & scientific | 2007 |
| European Alternatives Transnational Ukeig | | 2011 |
| European Channel Development Limited | Administrative & support | 2003 |
| Evans Sharp Productions Limited | Arts & recreation | 2024 |
| Event Power Limited | Other services | 1997 |
| Eyre Properties Limited | Real estate | 2008 |
| F. Dobson & Sons Limited | Construction | 1948 |
| F. M. Suckling Limited | Construction | 1977 |
| F. T. Gearing Landscape Services Limited | Administrative & support | 1976 |
| F.L. Dickins Limited | Wholesale & retail | 1949 |
| F.T. Taylor (Watford) Limited | Wholesale & retail | 1979 |
| Facilities Design Limited | Real estate | 1993 |
| Family Clinic Limited | Health & social care | 2026 |
| Fanz Property Investments Limited | Real estate | 2005 |
| Farchase Limited | Real estate | 2006 |
| Father Sons Properties Ltd | Real estate | 2021 |
| Feanor Limited | Extraterritorial | 2003 |
| FH Luxury Chauffeurs Ltd | Transport & logistics | 2025 |
| Fibre Network Group Ltd | Information & communication | 2018 |
| Fiery Digital Imaging Ltd | Information & communication | 1992 |
| Film SET Productions Ltd | Construction | 2021 |
| Firdane Limited | | 1975 |
| Firevent Limited | | 1984 |
| First Action Drainage Services Ltd | Water & waste | 2016 |
| First London Entertainment Limited | | 1992 |
| First XI Limited | Extraterritorial | 2006 |
| Fishpools (Finance) Limited | Real estate | 1965 |
| Fishpools Limited | Wholesale & retail | 1935 |
| Flamborough Limited | Real estate | 2006 |
| Forebury Estates Limited | Construction | 1947 |
| Forever Clean TOO Limited | Households | 2006 |
| Fork Truck Tyres Ltd | Wholesale & retail | 2011 |
| Format Computer Services Limited | Information & communication | 1990 |
| Forming Solutions (UK) Limited | Wholesale & retail | 2005 |
| Fowlmere Investments Ltd | Administrative & support | 2007 |
| Foxholes Nursing Home Limited | Health & social care | 1993 |
| Frampton Plants Limited | | 1962 |
| Freelance Catering Supplies Limited | Transport & logistics | 2003 |
| Fresh BIN Limited | Professional & scientific | 2006 |
| Frow Limited | | 1973 |
| Fullerton Engineering Limited | Professional & scientific | 2001 |
| Fullhouse Pubs Ltd | Hospitality | 2022 |
| FVC Cleaning Ltd | Administrative & support | 2024 |
| FVC Properties Ltd | Real estate | 2025 |
| G & G Architectural Powder Coatings LLP | | 2006 |
| G. & M. Reed Motors Limited | Wholesale & retail | 1986 |
| G.B. Christie Limited | Professional & scientific | 1934 |
| G.T. Towing Limited | Wholesale & retail | 1991 |
| Gaia Interiors Ltd | Professional & scientific | 2022 |
| Galemorn Ltd | Wholesale & retail | 2007 |
| Garston Contractors (Joyce) Limited | | 1971 |
| GB Motor Consulting Ltd | Professional & scientific | 2022 |
| GDB Business Services Limited | Professional & scientific | 2005 |
| Gelyse Properties Ltd | Real estate | 2023 |
| Geoffrey Parker Games Limited | Manufacturing | 2007 |
| Getonmusicmedia Limited | Arts & recreation | 2017 |
| GKG Retail Ltd | Wholesale & retail | 2024 |
| Gladelane Limited | | 1986 |
| Globe Universal Limited | Real estate | 2000 |
| Glowshadow Limited | Information & communication | 1986 |
| Goat Gummies Ltd | Manufacturing | 2025 |
| Goliath Reservation Systems Limited | Information & communication | 2009 |
| Goodkind Estates Limited | Real estate | 1998 |
| Gourmet Industries Limited | | 1980 |
| Grafton Developments Limited | Construction | 1985 |
| Grangeland Court Limited | | 1984 |
| Grangemoor Estates Limited | Construction | 2007 |
| GRC Resourcing Limited | Administrative & support | 2015 |
| Greedy Lemon Corporation Ltd | Professional & scientific | 2018 |
| Green Accountancy Services Limited | Professional & scientific | 2000 |
| Greentimber Forest Products Limited | Agriculture & fishing | 2006 |
| Greyhound Racing Veterinary Services Limited | Professional & scientific | 2007 |
| Grosvenor Bridging Loans Limited | Financial services | 2012 |
| Guilt Free Creative Ltd | Professional & scientific | 2014 |
| GV Engineering Services Ltd | Construction | 2023 |