| D'Azur Ltd | Information & communication | 2021 |
| D.J.C. Garage Equipment Services Limited | Manufacturing | 2008 |
| D.S. Green & SON Limited | Construction | 2011 |
| D3XR Ltd | Professional & scientific | 2024 |
| DAB Infra Ltd | Professional & scientific | 2025 |
| Dabros Floor Surveys Limited | Professional & scientific | 2018 |
| Dachit Limited | Information & communication | 2016 |
| Daedalus Security Services Ltd. | Information & communication | 2023 |
| Dair Design and Consulting Limited | Professional & scientific | 2011 |
| Dale Building Limited | Construction | 1986 |
| Dale Property & Design Limited | Construction | 2004 |
| Dambury Ltd | Professional & scientific | 2026 |
| Damilah Healthtec Ltd | Information & communication | 2023 |
| Damilah Holdings Limited | Financial services | 2021 |
| Damilah Technology Limited | Information & communication | 2021 |
| Damiline Ltd | Financial services | 2022 |
| DAN Bailey Building Limited | Construction | 2012 |
| DAN Bailey Properties Limited | Real estate | 2023 |
| Dancers Delights Limited | Extraterritorial | 2010 |
| Danisco Consulting Ltd | Real estate | 2015 |
| Dark Knight Ltd | Information & communication | 2023 |
| Darna House Limited | Hospitality | 1965 |
| DAS Home Improvements Limited | Construction | 2025 |
| Data Fusionary Ltd | Information & communication | 2025 |
| Data Interface Solutions Ltd | Information & communication | 2021 |
| Datadq Ltd | Information & communication | 2023 |
| Datago Ltd | Information & communication | 2023 |
| Datanamics Limited | Information & communication | 2025 |
| Datareed Limited | Financial services | 2022 |
| Dataris Ltd | Professional & scientific | 2025 |
| Datirocha Limited | Hospitality | 2025 |
| Datumai Ltd | Information & communication | 2023 |
| Daval House Management Limited | Households | 1984 |
| Dave Fulton Holdings Limited | Financial services | 2022 |
| Davico Ties & Terminals Limited | Extraterritorial | 2016 |
| David Bailey Enterprises Limited | Professional & scientific | 1988 |
| David Graham Landscapes Ltd | Administrative & support | 2020 |
| David M Seward Ltd | Professional & scientific | 2022 |
| David Taylor Associates (Hungerford) Ltd | Other services | 2016 |
| Davies Electrical Services (Whitchurch) Limited | Construction | 2018 |
| DBF Events Ltd | Administrative & support | 2013 |
| DBM Amarone Limited | Hospitality | 2025 |
| DC Sports and Coaching Ltd | Health & social care | 2025 |
| DC Tech Insights Ltd | Information & communication | 2021 |
| Deal Varney | | 1989 |
| Deal Varney (Newbury) Limited | Real estate | 2006 |
| Dean Ling Plastering Limited | Construction | 2003 |
| Deanos Smoothies Ltd | Hospitality | 2025 |
| Deanwood Farm Residents Limited | Professional & scientific | 2005 |
| Deanwood Park Golf Club Limited | Arts & recreation | 2001 |
| Deanwood Park Limited | Arts & recreation | 1990 |
| Deanwood Residents Limited | Households | 1979 |
| Dear Henry Ltd. | Wholesale & retail | 2010 |
| Dec's Electrical Company Limited | Construction | 2016 |
| Decco Construction Supplies Ltd | Extraterritorial | 2007 |
| Decco Limited | Wholesale & retail | 1946 |
| Decco Pension Trustees Limited | Professional & scientific | 1989 |
| Decoded.Legal Limited | Professional & scientific | 2015 |
| Decran Ltd. | Real estate | 2019 |
| DEE Rose Limited | Real estate | 2019 |
| DEE Wireless Limited | Professional & scientific | 2015 |
| Deeland Trustees Limited | Professional & scientific | 2019 |
| Deepchill Limited | Administrative & support | 2016 |
| Deepen Ltd | Professional & scientific | 2023 |
| Deerpath Ltd | Real estate | 2022 |
| Define Space Ltd | Professional & scientific | 2015 |
| Definitely Wood Ltd | Manufacturing | 2026 |
| Deftli Ltd | Wholesale & retail | 2017 |
| Delagua Water Testing Limited | Manufacturing | 2006 |
| Delaney Grey Ltd | Arts & recreation | 2023 |
| Delphic Brewing Company Ltd | Manufacturing | 2018 |
| Deltawest Housing Partners Limited | Real estate | 2026 |
| Demand Generation Consulting Ltd | Information & communication | 2023 |
| Dendrobium Advanced Technologies Limited | Other services | 2018 |
| Denenberg Veterinary Medicine UK Limited | Professional & scientific | 2026 |
| Denford Park Holding Company Limited | Extraterritorial | 2017 |
| Denford Park Services Limited | Households | 2019 |
| Denford Stud Limited | Administrative & support | 1993 |
| Denman PUB Co Limited | Hospitality | 2015 |
| Dennington AR Limited | Administrative & support | 2016 |
| Derrar Consulting Limited | Financial services | 2015 |
| Design Interior Contracts Ltd | Construction | 2009 |
| Designfield Creative Ltd | Administrative & support | 2017 |
| Deta Electrical Company Limited | Wholesale & retail | 1958 |
| DEV Sharma Consulting Ltd | Professional & scientific | 2022 |
| Devihill Limited | Real estate | 2001 |
| Devon News Media Limited | Information & communication | 1985 |
| Devopster IT Consultants Ltd | Wholesale & retail | 2016 |
| DGC Plumbing Services Limited | Construction | 2026 |
| DGM Landscape & Ground Maintenance Services Limited | Administrative & support | 2025 |
| DGP Express Ltd | Transport & logistics | 2019 |
| Diallo Private Ltd | Transport & logistics | 2023 |
| Diamond Catering and Events Ltd | Hospitality | 2025 |
| Diamond Counsellor International Ltd | Professional & scientific | 2017 |
| Diamond Spark Ltd | Administrative & support | 2025 |
| Different Snow Limited | Administrative & support | 2013 |
| Digital Dividend Limited | Information & communication | 2009 |
| Digital Hints Ltd | Professional & scientific | 2019 |
| Digital Oryx Limited | Information & communication | 2026 |
| Digital Sport 12 Ltd | Arts & recreation | 2023 |