| D.I.T Fish Cave Limited | Wholesale & retail | 2026 |
| D.J Edwards Limited | Information & communication | 2016 |
| D.J. Moore Limited | Wholesale & retail | 2001 |
| D.J. Scriven Roofing Contractors Ltd | Construction | 2016 |
| D.K.E Solutions Limited | Administrative & support | 2005 |
| D.K.R. Partnerships Ltd | Real estate | 2012 |
| D.K.W Motors Ltd | Wholesale & retail | 2018 |
| D.M.Jones. Holdings Limited | Financial services | 2023 |
| D.M.Pickard Construction Limited | Construction | 2016 |
| D.M.R. Inventions International Limited | Information & communication | 2025 |
| D.M.T.M. Ltd | Wholesale & retail | 2025 |
| D.Micdan Ltd | Transport & logistics | 2014 |
| D.N.A Technical Holdings Limited | Financial services | 2015 |
| D.N.A. Club Limited | Arts & recreation | 2024 |
| D.N.A. Technical Services Limited | Professional & scientific | 2001 |
| D.N.T. Company Limited | Wholesale & retail | 1993 |
| D.Nash Developments Ltd | Construction | 2020 |
| D.O.O.M Productions Ltd | Information & communication | 2026 |
| D.P. Finnimore & Co LLP | | 2002 |
| D.P. Forrest Limited | Wholesale & retail | 1977 |
| D.P. Roofing Ltd | Construction | 2019 |
| D.P.E. Limited | Professional & scientific | 1999 |
| D.P.S. (Birmingham) Limited | Real estate | 1996 |
| D.R. Freeman Limited | Construction | 2004 |
| D.R. Warehouse Limited | Construction | 1988 |
| D.R.E. Group Holdings Limited | Other services | 2024 |
| D.R.E. Solutions Ltd | Manufacturing | 2015 |
| D.R.P. Supplies Limited | Wholesale & retail | 1984 |
| D.R.S Property Developments Limited | Real estate | 2021 |
| D.S. Marks Limited | Health & social care | 1998 |
| D.U Property Ltd | Real estate | 2017 |
| D06 Studios Ltd | Professional & scientific | 2022 |
| D1 Barbers Ltd | Other services | 2019 |
| D1 Gyms Ltd | Arts & recreation | 2024 |
| D1 Stores Ltd | Arts & recreation | 2025 |
| D2 Electrical Services Limited | Construction | 2022 |
| D2C Healthcare Ltd | Health & social care | 2025 |
| D2D Distribution Midlands Ltd | Transport & logistics | 2022 |
| D2D Support Limited | Health & social care | 2025 |
| D2S Business Solutions Ltd | Information & communication | 2013 |
| D2S Utility Plus Ltd | Other services | 2026 |
| D2SQUARE Ltd | Extraterritorial | 2021 |
| D2STUDIOS Ltd | Arts & recreation | 2021 |
| D3 Express Ltd | Hospitality | 2021 |
| D365 Care Ltd | Information & communication | 2023 |
| D4 Shopfitting Ltd | Construction | 2021 |
| D57 Media Ltd | Professional & scientific | 2025 |
| D8 Executive Travel Limited | Administrative & support | 2021 |
| D821 Limited | Transport & logistics | 2015 |
| D8568 Limited | Transport & logistics | 2023 |
| DA & Co Express Ltd | Transport & logistics | 2025 |
| DA Clinical Therapies Ltd | Health & social care | 2025 |
| DA Costa and Garcia Ltd | Health & social care | 2014 |
| DA Costa Wines Ltd | Wholesale & retail | 2019 |
| DA Cruz Bussines Ltd | Wholesale & retail | 2025 |
| DA Food Service Limited | Hospitality | 2025 |
| DA Gino Streetly Limited | Hospitality | 2025 |
| DA Greenx Ltd | Professional & scientific | 2023 |
| DA Legal Ltd | Real estate | 2010 |
| DA Manager Solutions Limited | Information & communication | 2018 |
| DA Shop Ltd | Wholesale & retail | 2021 |
| DA SI XI Ltd | Hospitality | 2024 |
| DA Silva Group Holdings Ltd | Financial services | 2024 |
| DA Vinci Grab and Go Food Ltd | Agriculture & fishing | 2024 |
| DA Wholesale Limited | Wholesale & retail | 2024 |
| DA Workforce Ltd | Administrative & support | 2026 |
| DA Ziran Limited | Health & social care | 2020 |
| Da-Mart Ltd | Wholesale & retail | 2025 |
| Daabo Limited | Real estate | 2024 |
| Daacadflow Ltd | Transport & logistics | 2025 |
| Daadam Ltd | Wholesale & retail | 2026 |
| Daalijan Ltd | Transport & logistics | 2025 |
| Daani Automotive Ltd | Wholesale & retail | 2022 |
| Daans Plumbing Services Ltd | Construction | 2025 |
| Daar-Ul-Jannah Ltd | Education | 2018 |
| Daarul Arqam Education Centre Limited | Health & social care | 2014 |
| Daarul Jannah Trust Limited | Professional & scientific | 2008 |
| DAB Bookkeeping Limited | Professional & scientific | 2006 |
| DAB Capital Ltd | Real estate | 2020 |
| DAB Cloud Solutions Ltd | Information & communication | 2022 |
| DAB Pixels Ltd | Professional & scientific | 2026 |
| Daba Couriers Limited | Transport & logistics | 2022 |
| Dabbs Ltd | Financial services | 2010 |
| Dabhelix Stores Ltd | Wholesale & retail | 2025 |
| Dablesville Quality Care C.I.C. | Health & social care | 2026 |
| Dabmoo Limited | Wholesale & retail | 2014 |
| Daboo Limited | Information & communication | 2023 |
| Dabop Services Limited | Health & social care | 2025 |
| Dabserv London Limited | Administrative & support | 2023 |
| DAC Cars Ltd | Wholesale & retail | 2018 |
| DAC Lift Services Ltd | Manufacturing | 2025 |
| Dacar Trans Ltd | Transport & logistics | 2014 |
| Dacecrown Limited | Manufacturing | 2000 |
| Dacfon Ltd. | Information & communication | 2015 |
| Dacfon Technologies Ltd | Manufacturing | 2013 |
| Dachen Global Ltd | Wholesale & retail | 2024 |
| Dacian Tech Limited | Wholesale & retail | 2025 |
| DAD Studio Ltd | Manufacturing | 2022 |
| Dadda Blinds Ltd | Manufacturing | 2025 |
| Daden Limited | Information & communication | 2004 |