| Diesel-Electro Components Limited | Real estate | 1970 |
| Diesels Direct (Halesworth) Limited | Wholesale & retail | 2001 |
| Dietbeaters Ltd | Information & communication | 2023 |
| Different Foodstuffs Ltd | Hospitality | 2025 |
| Different Group Limited | Financial services | 2016 |
| Different Holdings Ltd | Extraterritorial | 2022 |
| Different Minds (Adhd-Asd Norfolk) Limited | Health & social care | 2024 |
| Different Minds East Anglia Limited Liability Partnership | | 2020 |
| Diffusion Global Limited | Other services | 2023 |
| DIG Contractors Limited | Administrative & support | 2007 |
| Digby Nash Ltd | Financial services | 2023 |
| Digdeep Consultants Ltd | Professional & scientific | 2010 |
| Digiac Limited | Manufacturing | 2003 |
| Digibee Ltd | Information & communication | 2005 |
| Digihealth Diagnostic Solutions Limited | Information & communication | 2016 |
| Digimax Marketing Management Ltd | Professional & scientific | 2025 |
| Digiqube Limited | Manufacturing | 2010 |
| Digital 165 Ltd | Information & communication | 2021 |
| Digital Access Solutions Limited | Real estate | 2006 |
| Digital Audiology Ltd | Information & communication | 2025 |
| Digital Boss Limited | Professional & scientific | 2017 |
| Digital Done Right Ltd | Professional & scientific | 2024 |
| Digital Experience Advisory Services Limited | Information & communication | 2023 |
| Digital Fuel Holdings Limited | Information & communication | 2019 |
| Digital GAP Ltd | Wholesale & retail | 2014 |
| Digital Growth Guru Limited | Wholesale & retail | 2009 |
| Digital Histopathology Services Ltd | Health & social care | 2026 |
| Digital Lads Limited | Education | 2025 |
| Digital Legacy Ltd | Manufacturing | 2026 |
| Digital Matrix (DM) Ltd | Information & communication | 2026 |
| Digital Network Solutions Ltd | Information & communication | 2001 |
| Digital North Star Limited | Professional & scientific | 2023 |
| Digital Rebellion Limited | Information & communication | 2016 |
| Digital Select Limited | Information & communication | 2008 |
| Digital Select UK Limited | Financial services | 2009 |
| Digital Signage Pro Limited | Wholesale & retail | 2025 |
| Digital Wizards Agency Ltd | Professional & scientific | 2022 |
| Digital Yeti Limited | Information & communication | 2017 |
| Digitallandsolutions Ltd | Information & communication | 2015 |
| Digitive Ltd | Information & communication | 2014 |
| Digitrade Intl Ltd | Wholesale & retail | 2010 |
| Digival Limited | Information & communication | 2016 |
| Dignetsol Group Ltd | Financial services | 2026 |
| Dijay Limited | Administrative & support | 2012 |
| DIL Professional Services Limited | Professional & scientific | 2019 |
| Dilham Marina Maintenance Ltd | Households | 2019 |
| Dilkhush Limited | Hospitality | 2017 |
| Dillon Morrall LLP | | 2008 |
| Dilruba Restaurant Limited | Hospitality | 2011 |
| Dimark Services Limited | Construction | 2003 |
| Dimascio Ice Cream Limited | Wholesale & retail | 2007 |
| Dimension Signs Limited | Manufacturing | 2014 |
| Dimler Group Limited | Transport & logistics | 2019 |
| Dingley Solutions Ltd | Information & communication | 2025 |
| Dinx Property Limited | Real estate | 2015 |
| Dion & Family Ltd | Transport & logistics | 2019 |
| Dionysus Foods Ltd | Hospitality | 2023 |
| Dionysys Limited | Information & communication | 1980 |
| DIP Print UK Limited | Manufacturing | 2014 |
| Dipple & Conway (Holdings) Limited | Financial services | 2015 |
| Dipple & Conway (Norwich) Limited | Wholesale & retail | 1962 |
| Dipublica Content Studio Ltd | Wholesale & retail | 2017 |
| Direct Cleaning Norwich Ltd | Administrative & support | 2026 |
| Direct Colour Ltd | Manufacturing | 2009 |
| Direct Country Foods Ltd | Wholesale & retail | 2019 |
| Direct Event Hire Ltd | Hospitality | 2019 |
| Direct Home Finance Advice Limited | Other services | 2015 |
| Direct Immigration Solutions Ltd. | Professional & scientific | 2016 |
| Direct Line Group Limited | Professional & scientific | 1993 |
| Direct Line Insurance Group Limited | Professional & scientific | 1988 |
| Direct Line Insurance Limited | Financial services | 1984 |
| Direct Motors London Ltd | Manufacturing | 2017 |
| Direct Purchasing Solutions Limited | Wholesale & retail | 2005 |
| Direct Route Logistics Limited | Transport & logistics | 2025 |
| Direct UK Group Limited | Financial services | 2025 |
| Direct Van Hire Limited | Administrative & support | 2025 |
| Direct Vehicle Recovery Limited | Transport & logistics | 2025 |
| Dirty Little Goblins (2018) Limited | Information & communication | 2018 |
| Disabled Motoring UK | Other services | 2005 |
| Disaster Care Limited | Administrative & support | 2005 |
| Display Protect Solutions Limited | Manufacturing | 2014 |
| Diss Business Space Ltd | Real estate | 2021 |
| Diss Car Centre Ltd | Wholesale & retail | 2026 |
| Diss Window & Conservatory Solutions Limited | Construction | 2014 |
| Distinct Building Limited | Construction | 2016 |
| Distinct Hotels Limited | Hospitality | 1992 |
| Distinct Signs & Graphics Ltd | Professional & scientific | 2018 |
| Distinctive Home Improvements Ltd | Construction | 2024 |
| Distinctive Pubs Limited | Hospitality | 2021 |
| Distorted Steel Ltd | Manufacturing | 2019 |
| Distributed Solar Energy Limited | Energy | 2011 |
| Diva Opera Limited | Professional & scientific | 2012 |
| Diversa Trading Limited | Real estate | 2018 |
| Diverse CAB Ltd | Transport & logistics | 2021 |
| Diversify ME Ltd | Education | 2023 |
| Diversity Plus PU Limited | Hospitality | 2019 |
| Divided Space Limited | Construction | 1998 |
| Divine Hands Limited | Transport & logistics | 2019 |
| Divine Self Love Ltd | Other services | 2023 |
| Divis Properties Limited | Real estate | 2015 |