| D&D Concept Services Limited | Real estate | 2017 |
| D&D Trading Ltd | Wholesale & retail | 2020 |
| D&F Medicare Ltd | Health & social care | 2025 |
| D&G Varsani Ltd | Real estate | 2018 |
| D&J Aero Ltd | Manufacturing | 2016 |
| D&J Roofing & Building Solutions Ltd | Construction | 2026 |
| D&K CMS Limited | Construction | 2024 |
| D&K Property Services Ltd | Construction | 2019 |
| D&K Ventures Ltd | Real estate | 2016 |
| D&M Consultancy Ltd | Professional & scientific | 2015 |
| D&M Transport Services Ltd | Transport & logistics | 2019 |
| D&M United Ltd | Construction | 2021 |
| D&S Collaboration Ltd | Wholesale & retail | 2025 |
| D&S Event Catering Warwickshire Limited | Hospitality | 2020 |
| D&S Medical Consultancy Limited | Health & social care | 2022 |
| D&T Bradford Ltd | Wholesale & retail | 2024 |
| D'Canted Property Cellars Limited | Real estate | 2024 |
| D'Dee's Delight Ltd | Hospitality | 2025 |
| D'Lux Properties & Corporate Relocation Ltd | Hospitality | 2024 |
| D-Clink Limited | Professional & scientific | 2017 |
| D-Code Entertainment Ltd | Hospitality | 2019 |
| D. Design and Build Ltd | Construction | 2024 |
| D. FIX Bridgend Limited | Wholesale & retail | 1977 |
| D. Herbert (Builders) Limited | Construction | 1956 |
| D. Lowy & SON (Butchers) Limited | Extraterritorial | 1975 |
| D.& J.Ranken,Limited | Wholesale & retail | 1925 |
| D.A. Building Maintenance Ltd | Construction | 2025 |
| D.A.N.S. Global Holdings Limited | Financial services | 2023 |
| D.B. Cleaners & Launderers Limited | Other services | 1989 |
| D.B.R. Investments Limited | | 1973 |
| D.C Transportation Limited | Transport & logistics | 2019 |
| D.C. Basturea Construction Limited | Professional & scientific | 2015 |
| D.C. Daylight Ltd. | Professional & scientific | 1995 |
| D.G. Decorators Limited | Wholesale & retail | 2000 |
| D.I.V. Removals and Delivery Ltd | Wholesale & retail | 2019 |
| D.J. Barrington (Properties) Limited | Real estate | 1983 |
| D.J. Mackay & SON Roofing Contractors Ltd | Construction | 2022 |
| D.Lynas Ltd | Administrative & support | 2012 |
| D.M. Delivery Services Ltd | Transport & logistics | 2026 |
| D.Morgan & Sons(The Parade)Limited | Real estate | 1949 |
| D.N.D.M. Limited | Administrative & support | 2010 |
| D.Nicholls & Sons Limited | | 1968 |
| D.P. Tarmacadam Limited | Construction | 2019 |
| D.R. Cecil Jones & SON Limited | Wholesale & retail | 1964 |
| D.S Bristol Motors Ltd | Wholesale & retail | 2024 |
| D.S. (Poole) Ltd | Construction | 2014 |
| D.S. Howell Financial Services Limited | Financial services | 2004 |
| D.S. Howell Holdings Ltd | Financial services | 2022 |
| D.T.R.Clinic Limited | Health & social care | 1999 |
| D.Thomas Productions Ltd | Information & communication | 2022 |
| D1 Trade Ltd | Construction | 2016 |
| D1MGY Media & Promotions CYF | Arts & recreation | 2024 |
| D2 Mastery Ltd | Health & social care | 2024 |
| D2 Propco (Holdings) Limited | Financial services | 2024 |
| D2 Propco Ltd | Hospitality | 2017 |
| D2 Propco Maintenance Limited | Construction | 2023 |
| D2D Trans Ltd | Transport & logistics | 2019 |
| D2EAK Solutions Ltd | Information & communication | 2015 |
| D2P Limited | Manufacturing | 2025 |
| D2R Fitness CIC | Health & social care | 2024 |
| D2ZIGN Exhibitions & Interiors Ltd | Professional & scientific | 2017 |
| D3003TEC Ltd | Information & communication | 2025 |
| D4DETAIL Ltd | Wholesale & retail | 2021 |
| D4U Property Ltd | Real estate | 2024 |
| D8 Building Contractors Limited | Construction | 2017 |
| DA Estates Limited | Real estate | 2019 |
| DA Lian MAO Trading Limited | Wholesale & retail | 2021 |
| DA Mobile Ltd | Wholesale & retail | 2018 |
| DA Rose Electrics Limited | Construction | 2014 |
| DA Selection Store Co Ltd | Wholesale & retail | 2025 |
| DA YU Ying Limited | Information & communication | 2021 |
| DA1 Construction Ltd | Construction | 2018 |
| Daamseh Group Ltd | Wholesale & retail | 2025 |
| Dabasiya Builders Ltd | Construction | 2022 |
| Dabrio Recruitment Ltd | Public administration | 2020 |
| Dabrow Ltd | Wholesale & retail | 2016 |
| Dabrowa-Klotz Ltd | Transport & logistics | 2019 |
| DAC Catering Limited | Hospitality | 2014 |
| DAC SW Limited | Wholesale & retail | 2019 |
| Daca Holding Ltd | Professional & scientific | 2025 |
| Daccs Limited | Wholesale & retail | 2006 |
| Dace Limited | Professional & scientific | 2023 |
| Dacey Homes Limited | Real estate | 2024 |
| Dacey Ltd | Manufacturing | 1987 |
| Dachol Services Limited | Professional & scientific | 2014 |
| Dacorum Tring Road Ltd | Real estate | 2022 |
| Dacos Trans Ltd | Transport & logistics | 2018 |
| Dacs Enterprises Ltd | Real estate | 2017 |
| Dada Motors Limited | Other services | 2018 |
| Dadadom Ltd | Real estate | 2023 |
| Dadam Properties Ltd | Real estate | 2020 |
| Dadashov Ltd | Wholesale & retail | 2025 |
| Daddy's Tea POT Ltd | Information & communication | 2013 |
| Dadnam Medical Ltd | Extraterritorial | 2023 |
| Dadri Ltd | Wholesale & retail | 2022 |
| DAE TAE Tech Ltd | Information & communication | 2018 |
| Daedalus Aviation and Survival Services Ltd | Education | 2018 |
| DAF Cleaning Limited | Other services | 2019 |
| DAF Stationery Limited | Manufacturing | 2025 |
| Dafea Limited | Information & communication | 2014 |