| Dhawavin Capital Estates Ltd | Real estate | 2026 |
| Dheyanshi Catering Limited | Hospitality | 2023 |
| Dhiraj BEN Limited | Real estate | 1987 |
| Digital Electrical Services Limited | Other services | 2007 |
| Doha Financial Services Limited | | 1985 |
| Dominic Francis Limited | Wholesale & retail | 2025 |
| Dowling & Fransen (Engineers) Limited | Manufacturing | 1945 |
| DR Jack Kreindler Consulting Limited | Information & communication | 2003 |
| Drayton Road Residents Association Limited | Households | 1989 |
| E.M.A. (FAR East) Limited | Professional & scientific | 1992 |
| E.M.A. Group Limited | Information & communication | 1992 |
| EARTH8 Limited | Professional & scientific | 2014 |
| Ecofibres Limited | Professional & scientific | 2014 |
| Eisossy Global Limited Limited | Arts & recreation | 2017 |
| Elife Limited | Information & communication | 2005 |
| Embex Limited | Real estate | 1996 |
| Emerson Fortune Ltd | Information & communication | 2007 |
| Enfield Golf Club Limited | Arts & recreation | 1902 |
| Ergon Properties Limited | Real estate | 2019 |
| Estate Acquisition & Development Limited | Construction | 1963 |
| Excelsus Capital Ltd | Real estate | 2005 |
| Exousia Ltd | Information & communication | 1999 |
| Fairview New Homes (Management Company) Limited | Professional & scientific | 1995 |
| Fairview New Homes (Westminster Drive) Limited | Extraterritorial | 1997 |
| Farville Travel Limited | | 1985 |
| Felstead Properties Ltd | Real estate | 2005 |
| Financial Accountants Limited | Professional & scientific | 2005 |
| Five Crescent Ltd | Real estate | 2023 |
| Flash Flooring & Construction Ltd | Wholesale & retail | 2002 |
| Four Forks Investment Limited | Wholesale & retail | 2025 |
| FP Building & Property Management Ltd | Construction | 2026 |
| G & V Haulage Ltd | Transport & logistics | 2014 |
| G-Jets (UK) Limited | Professional & scientific | 2011 |
| Galower Builders Limited | Construction | 1978 |
| Gateway Estate Investments Limited | Real estate | 2003 |
| GEM Heating Limited | Construction | 2006 |
| Gemgate Ltd | Real estate | 1997 |
| Genesis Properties London Limited | Real estate | 2018 |
| GHK Consultancy Limited | Professional & scientific | 2003 |
| GHW Partnership Ltd | Extraterritorial | 2005 |
| Glacier Foods Limited | Manufacturing | 1957 |
| Global Advertising & Trading Limited | Information & communication | 2006 |
| Global Gold International Limited | Information & communication | 1989 |
| Goldform Enterprises Limited | Wholesale & retail | 1996 |
| Grand Union Wines Ltd | Wholesale & retail | 2025 |
| Grangecrest Properties Limited | Construction | 2003 |
| Greendyke Property Co. Limited | Construction | 1978 |
| GRG & Cornices Design Ltd | Manufacturing | 2015 |
| Grove Electrical Limited | Wholesale & retail | 1983 |
| Gurdaan Estate Ltd | Real estate | 2026 |
| H&S Media Limited | Information & communication | 2003 |
| H.G.B. Motor Cycles (Ruislip) Limited | Wholesale & retail | 1976 |
| Hadleigh (International) Limited | Wholesale & retail | 1993 |
| Hafu Limited | Health & social care | 2023 |
| Hamilton Corporation Limited | Real estate | 1995 |
| Harwood Press (Holdings) Limited | Real estate | 1974 |
| Harwood Press Advertising Limited | Administrative & support | 1946 |
| Hatch END Lawn Tennis Company Limited(The) | Arts & recreation | 1925 |
| Headsprung Limited | Manufacturing | 2005 |
| Helen David Training Limited | Education | 2010 |
| Hemburymill Limited | Professional & scientific | 1990 |
| Henderson Inniss Limited | Extraterritorial | 2015 |
| Hestbrow Limited | | 1973 |
| HI NET Linx Limited | Wholesale & retail | 2005 |
| High Voltage Power Resources Limited | Construction | 2007 |
| Hillingdon Law Centre | Professional & scientific | 1982 |
| Hillingdon Women's Centre | Health & social care | 1986 |
| Hindodev Limited | Information & communication | 2026 |
| Honeycroft Hill Ltd | Real estate | 1972 |
| Hounslow Shopfitters Limited | Construction | 1986 |
| HPH Developments Ltd | Administrative & support | 2003 |
| IGP Plastering Specialist Limited | Construction | 2014 |
| Indian Gymkhana Club Limited(The) | Arts & recreation | 1937 |
| Infomarshall Limited | Information & communication | 2007 |
| Intentus Consulting (UK) Limited | Information & communication | 2005 |
| Itemform Limited | | 1983 |
| J. Smith Coats (Shoreditch) Limited | | 1966 |
| J.E.T. Properties Limited | Extraterritorial | 2008 |
| J.P. Radia & Co. Limited | Information & communication | 1973 |
| J.R.Motors Limited | Professional & scientific | 1960 |
| Jadebridge Limited | | 1983 |
| Jagz Construction Ltd | Construction | 2007 |
| Jamin Properties (London) Limited | | 1949 |
| JAY Drinks Limited | | 1989 |
| Jigsaw Content Limited | Professional & scientific | 2016 |
| Jivesense Limited | | 1985 |
| Jiveskill Limited | | 1985 |
| Joah UK Co. Limited | Education | 2005 |
| John Daly (Plant Hire) Limited | | 1974 |
| John Gibbons Limited | Construction | 2007 |
| John Mullins & Company Limited | | 1981 |
| JS Freight Ltd | Transport & logistics | 2011 |
| Jutt Ltd | Extraterritorial | 2006 |
| K2LONG Ltd | Administrative & support | 2022 |
| Kadfire Limited | Information & communication | 1995 |
| Kaminique International Limited | | 1988 |
| Karltech Ltd | Information & communication | 2002 |
| King Edward's Grove Property Co. Limited | Households | 1986 |
| Klestro 2000 Limited | Manufacturing | 1999 |
| Kohli Properties Ltd | Real estate | 2020 |