| Dudley DW Operations Ltd | Hospitality | 2024 |
| Dudley Foods Ltd | Hospitality | 2025 |
| Dudley James Group Limited | Construction | 2021 |
| Dudley Park Flats Management Limited | Households | 2000 |
| Dudley Port DIY Ltd | Wholesale & retail | 2024 |
| Dudley Property Development Ltd | Construction | 2022 |
| Dudley Road Express Ltd | Wholesale & retail | 2025 |
| Dudley Road Halal Meat Ltd | Wholesale & retail | 2014 |
| Dudley Road Vapes Ltd | Wholesale & retail | 2023 |
| Dudley Store Ltd | Wholesale & retail | 2025 |
| Dudley Williams Properties Ltd | Real estate | 2021 |
| Dudleyroadbarber Ltd | Other services | 2011 |
| Dudus Truck/Driver Ltd | Transport & logistics | 2025 |
| Duffields Design and Build Limited | Construction | 2025 |
| Duffy & Co Creative Limited | Information & communication | 2021 |
| Duffy Design Limited | Professional & scientific | 2015 |
| Duffy's Roofing Contractors Ltd | Construction | 2023 |
| Duffy's Roofing Services Ltd | Construction | 2019 |
| Duggal (Properties) Limited | Real estate | 1987 |
| Duggal Logistics Ltd | Transport & logistics | 2019 |
| Duggan Retail & Leisure Group Limited | Wholesale & retail | 2016 |
| Duha Enterprise Ltd | Construction | 2020 |
| Duhaney Limited | Professional & scientific | 2018 |
| Duhok Super Hand Car Wash Limited | Administrative & support | 2026 |
| Duhra Brothers Limited | Financial services | 2024 |
| DUJ Advice Centre Ltd | Hospitality | 2022 |
| Dukan Ltd | Other services | 2017 |
| Duke Brothers Ltd | Wholesale & retail | 2008 |
| Duke Grove Apartments Ltd | Real estate | 2019 |
| Dukequart Limited | | 1985 |
| Dula International C.I.C. | Health & social care | 2020 |
| Dulay & Sons Ltd | Hospitality | 2018 |
| Dulce-Lux Realty Limited | Health & social care | 2023 |
| Dulcie Rose Support Ltd | Hospitality | 2019 |
| Dulhan Boutique Ltd | Manufacturing | 2020 |
| Dulview Limited | Real estate | 1993 |
| Dulwich House Holding Limited | Real estate | 2023 |
| Dumbo Digital Limited | Professional & scientific | 2020 |
| Dumfries Property Management Limited | Real estate | 2016 |
| Dumis Travel 2020 Limited | Transport & logistics | 2020 |
| Dumitran Sorin Ltd | Transport & logistics | 2016 |
| Dump Daddy Recycling Ltd | Water & waste | 2024 |
| Dunamis Development Limited | Construction | 2008 |
| Dunamis Holding Group Limited | Financial services | 2025 |
| Dunamis Web Services Limited | Information & communication | 2018 |
| Dunbar 7 Property Services Ltd | Financial services | 2023 |
| Dunbavin Rail Ltd | Construction | 2010 |
| Dunca Magneton Ltd | Transport & logistics | 2020 |
| Duncan Elliott Photography Ltd | Professional & scientific | 2016 |
| Duncan House Residents Company Limited | Real estate | 2002 |
| Duncan Riley Live Ltd | Arts & recreation | 2026 |
| Dunchurch Pharma Ltd | Health & social care | 2024 |
| Dundee Medics Limited | Health & social care | 2012 |
| Dune Holdings Limited | Professional & scientific | 2001 |
| Dunglaide Limited | Extraterritorial | 1992 |
| Dunham Swan Ltd | Hospitality | 2024 |
| Dunhill Property Ltd | Real estate | 2014 |
| Duniya Beautyy Ltd | Wholesale & retail | 2025 |
| Duniya International Limited | Wholesale & retail | 2025 |
| Dunk Rigging Ltd | Other services | 2018 |
| Dunleavy Dale Ltd | Professional & scientific | 2014 |
| Dunload Haulage Limited | Transport & logistics | 2025 |
| Dunlop Aircraft Tyres Limited | Manufacturing | 1996 |
| Dunn Apparel Ltd | Wholesale & retail | 2026 |
| Dunn Cleaning Ltd | Administrative & support | 2025 |
| Dunnes Plastic Fabrication Ltd | Manufacturing | 2021 |
| Dunns Produce Limited | Wholesale & retail | 1998 |
| Dunrose Optical Limited | Wholesale & retail | 2015 |
| Dunya Fashion House Ltd | Wholesale & retail | 2026 |
| Dunya Food Store Ltd | Wholesale & retail | 2025 |
| Dunya Global Ltd | Extraterritorial | 2013 |
| Dunya Interiors Ltd | Manufacturing | 2024 |
| Dunya Print Ltd | Manufacturing | 2016 |
| DUO Beds Ltd | Wholesale & retail | 2026 |
| DUO Education (International) Limited | Education | 2026 |
| DUO Productions Ltd | Information & communication | 2007 |
| DUO Signs and Print Ltd | Professional & scientific | 2011 |
| DUO WEI Limited | Hospitality | 2019 |
| Duobridge Properties Limited | Hospitality | 2026 |
| Duoform Precision Limited | Manufacturing | 1985 |
| Dupam Ltd | Health & social care | 2023 |
| Duper Mart Ltd | Wholesale & retail | 2026 |
| Duplex Gadgets Ltd | Manufacturing | 2016 |
| Duplicity 3D Ltd | Professional & scientific | 2022 |
| Duplikey Ltd | Administrative & support | 2016 |
| Dura Automotive Body & Glass Systems UK Limited | Manufacturing | 1990 |
| Dura Automotive Holdings U.K., Ltd | Financial services | 2016 |
| Dura Enterprises Ltd | Construction | 2015 |
| Durable Housewares Limited | | 1986 |
| Durac Repairs and Renovations Ltd | Construction | 2026 |
| Duraclean Ltd | Wholesale & retail | 2023 |
| Duraflor Flooring Ltd | Wholesale & retail | 2026 |
| Duranta Ltd | Construction | 2023 |
| Duraplast (UK ) Ltd | Manufacturing | 2019 |
| Duratek Solutions Ltd | Manufacturing | 2014 |
| Durdur Limited | Wholesale & retail | 2005 |
| Durga Jewellers Limited | Wholesale & retail | 1991 |
| Durgahans Ltd | Health & social care | 2015 |
| Durham ROW Partners Limited | Professional & scientific | 2016 |
| Durja Properties Ltd | Real estate | 2023 |