| D S L Accounting Limited | Professional & scientific | 1997 |
| D&T Millward Limited | Real estate | 2022 |
| D. R. Wedgewood Limited | Wholesale & retail | 1996 |
| D.B. Chelton Limited | Real estate | 2019 |
| D2L Partners LLP | | 2012 |
| D5M Consulting Limited | Professional & scientific | 2019 |
| D:Tox Lymphatic & Wellness Studio Ltd | Other services | 2025 |
| DA & Danny Properties Ltd | Real estate | 2025 |
| Daana Paani Restaurant Limited | Manufacturing | 2020 |
| Dailycolours Ltd | Health & social care | 2026 |
| Daisy Reed Ltd | Professional & scientific | 2024 |
| Daisy Sofia Permanent Cosmetics Ltd | Other services | 2024 |
| Daisyworks Projects Ltd | Professional & scientific | 2026 |
| Dale Street Property Limited | Real estate | 2020 |
| Dalma Services Limited | Wholesale & retail | 2015 |
| Dalton Wise Consultancy Limited | Professional & scientific | 2013 |
| DAM Engineering Ltd | Manufacturing | 2014 |
| Damian Griffin Limited | Health & social care | 2018 |
| DAN Burden Carpentry & Joinery Limited | Manufacturing | 2024 |
| Dan-Tech Garage Ltd | Wholesale & retail | 2020 |
| Dan-Y-Bryn Flats Management Company Limited | Real estate | 1997 |
| Danes Construction Limited | Construction | 2014 |
| Danicsam Limited | Financial services | 2023 |
| Daniel Charles Landscapes Limited | Administrative & support | 2019 |
| Danmar Global Lean Ltd | Professional & scientific | 2026 |
| Dantronics Ltd | Manufacturing | 2025 |
| Darbotron Limited | Professional & scientific | 2014 |
| Darby(Uk) Limited | Construction | 2025 |
| Dare Productions Ltd | Administrative & support | 2023 |
| Dark Archon Studios Ltd | Wholesale & retail | 2025 |
| Dark Kitchen Coventry Ltd | Hospitality | 2025 |
| Dark Lane Holdings Limited | Real estate | 2025 |
| Dark Matters Technology Ltd | Professional & scientific | 2024 |
| Darker Limited | Wholesale & retail | 2003 |
| Darklight Consulting Limited | Professional & scientific | 2018 |
| Darling Capital Ltd | Financial services | 2024 |
| Darlow Rosettes Limited | Manufacturing | 2010 |
| Darren Varney Limited | Administrative & support | 2018 |
| Darryl Ramoutar Medical Limited | Health & social care | 2019 |
| Daruri Coffee Limited | Wholesale & retail | 2025 |
| Daryl Nicholas Consultancy Ltd | Professional & scientific | 2021 |
| Data Academy Limited | Education | 2005 |
| Databuilder Limited | Information & communication | 2024 |
| Datacentre Monkey Ltd | Information & communication | 2014 |
| Dataday IT Ltd | Information & communication | 2019 |
| Datrics Ltd | Information & communication | 2020 |
| Daughter Studio (Holdings) Limited | Financial services | 2024 |
| Daughter Studio Ltd | Professional & scientific | 2016 |
| Dave Bowcutt Limited | Professional & scientific | 2012 |
| Dave Hill Graphic Design Ltd | Professional & scientific | 2021 |
| Dave Perry Photography Limited | Professional & scientific | 2003 |
| Daventry Hygiene & Disposables Limited | Other services | 2010 |
| David Astle Consultancy Limited | Professional & scientific | 2019 |
| David C Harrison Ltd | Professional & scientific | 2015 |
| David Cain Consultancy Ltd | Professional & scientific | 2022 |
| David Clohessy Ltd | Financial services | 2015 |
| David Irving Consultancy Limited | Professional & scientific | 2015 |
| David Savery Electrical Services Ltd | Manufacturing | 2012 |
| David's Heating and Plumbing Engineers Limited | Construction | 2013 |
| Davis Techno Services Ltd | Information & communication | 2023 |
| Dawn Chorus Digital Consultancy Ltd | Professional & scientific | 2022 |
| Dawn Studios Ltd | Other services | 2025 |
| Dawson's Engineering & Surveying Ltd | Construction | 2024 |
| Day Property Holdings Ltd | Extraterritorial | 2021 |
| DB General Ltd | Construction | 2018 |
| DB Polo Ltd | Arts & recreation | 2021 |
| DB Rugby Property Management Limited | Professional & scientific | 2016 |
| DBW Homes Limited | Real estate | 2020 |
| DC Express Limited | Transport & logistics | 2001 |
| DC Legal Limited | Professional & scientific | 2018 |
| DC Tiddington Management Company Limited | Households | 2019 |
| DC Ventures Group Ltd | Wholesale & retail | 2026 |
| Dcbp Assets Limited | Professional & scientific | 2022 |
| Dcbp Holdings Ltd | Financial services | 2025 |
| DCL Discounts Ltd | Wholesale & retail | 2026 |
| DCS Catering and Delivery Ltd. | Transport & logistics | 2017 |
| DCT Project Management Ltd. | Professional & scientific | 2018 |
| DDA Auto Consultancy Limited | Professional & scientific | 2018 |
| DDG Building Limited | Construction | 2016 |
| DDR Limited | Manufacturing | 2003 |
| Ddsz Holdings Limited | Financial services | 2022 |
| DE and C Property Ltd | Real estate | 2025 |
| DE Cotta Mckenna Y Santafe Limited | Professional & scientific | 2003 |
| DE Luca Investment Property Limited | Construction | 2023 |
| DE Voyle Litho Limited | Manufacturing | 1995 |
| Deanspark Enterprises Limited | Real estate | 2016 |
| Dear SIX Ltd | Wholesale & retail | 2024 |
| Deaselec Limited | Construction | 2011 |
| Decanter Spirit Ltd | Wholesale & retail | 2016 |
| Decibel Podcasts Ltd | Information & communication | 2020 |
| Decibelle Research and Development Laboratory Ltd | Professional & scientific | 2020 |
| Decoded Reality Ltd | Health & social care | 2025 |
| Dedi Ltd | Construction | 2016 |
| Deegan Property Ltd | Real estate | 2021 |
| Deelan Ltd | Wholesale & retail | 2024 |
| Deep Arcade Ltd | Wholesale & retail | 2017 |
| Deep Search Global Ltd | Administrative & support | 2026 |
| Deepam Import and Export Ltd | Wholesale & retail | 2024 |
| Deepcall Limited | Information & communication | 2025 |
| Deesign Properties Limited | Real estate | 2022 |