| Danilo Properties LLP | | 2009 |
| Dash & Go Ltd | Administrative & support | 2020 |
| Dasto Limited | Professional & scientific | 2020 |
| Dattrax Software Ltd | Information & communication | 2020 |
| Dave Casey & Co. Limited | Construction | 1976 |
| Dave I'Anson Brickworks Ltd | Construction | 2017 |
| Dave Moses Transport Ltd | Transport & logistics | 2019 |
| David Rafferty & Co Ltd | Financial services | 2017 |
| DAVIDCOOPER1989 Limited | Construction | 2025 |
| Dawson Development Group Ltd | Real estate | 2026 |
| Dawson Landscapes Limited | Administrative & support | 2003 |
| Dawson Property Group Limited | Real estate | 2026 |
| Dawson Render Ltd | Construction | 2025 |
| Dawson Rendering Systems Limited | Construction | 2018 |
| Day&Sons Transport Ltd | Transport & logistics | 2024 |
| Dazze Ltd | Professional & scientific | 2019 |
| DB Commercial Decorators Ltd | Professional & scientific | 2017 |
| DB Drylining Limited | Construction | 2007 |
| DB Mechanical Engineering Ltd | Professional & scientific | 2026 |
| DC Presidents | Arts & recreation | 2020 |
| DC Web Development Ltd | Information & communication | 2019 |
| Dcwd Group Limited | Information & communication | 2026 |
| Dealcop Ltd | Construction | 2024 |
| Dean Henzell Joinery Limited | Administrative & support | 2020 |
| Deepdale Holdings Limited | Manufacturing | 2012 |
| Deer Run Advisory Limited | Professional & scientific | 2024 |
| Deld Services Ltd | Construction | 2024 |
| DELI-CIOUS1 Ltd | Hospitality | 2021 |
| Delta Fabs Limited | Construction | 2015 |
| Delta Tutoring Ltd | Education | 2022 |
| Dembright Cleaning Limited | Administrative & support | 2020 |
| Deneaim Limited | Real estate | 1989 |
| Deneside Accounting Limited | Professional & scientific | 2022 |
| Deniz 2 Ltd | Hospitality | 2019 |
| Dennis Bartram Consultancy Limited | Professional & scientific | 2025 |
| Denon Construction & Site Services Limited | Construction | 2003 |
| Dent Gear Ltd | Manufacturing | 2025 |
| Dent X Health Services Limited | Manufacturing | 2021 |
| Denton Management Company Ltd | Real estate | 2010 |
| DER Services ( North East ) Ltd | Construction | 2014 |
| Derma Guys Ltd | Other services | 2024 |
| Design and Engineering Reticular Response Enterprise Limited | Professional & scientific | 2006 |
| Detegi Consulting Limited | Extraterritorial | 2023 |
| Develop & Discover Ltd | Education | 2026 |
| Devere Global Solutions Limited | Administrative & support | 2005 |
| Devil Dog Distribution Limited | Wholesale & retail | 2024 |
| DG Coxon Logistics Ltd | Transport & logistics | 2025 |
| DGB Renovations Ltd | Construction | 2016 |
| DGS Scaffolding NE Ltd | Construction | 2023 |
| DH Dowen Limited | Real estate | 2014 |
| Dharma Consultancy Limited | Professional & scientific | 2010 |
| Diamond Home Support (Teesside) Ltd | Other services | 2018 |
| DID YOU SEE That CIC | Information & communication | 2025 |
| Didos Stockton Limited | Wholesale & retail | 2023 |
| Digital Remastering UK Limited | Information & communication | 2026 |
| Digital Sense Technologies Ltd | Information & communication | 2025 |
| Digital Twin Solutions Limited | Manufacturing | 2024 |
| Dilshad Balti & Tandoori Ltd | Hospitality | 2017 |
| Dimensional Control Services Limited | Professional & scientific | 2025 |
| Dinga Inspections Limited | Construction | 2019 |
| Direct Project Services Ltd | Professional & scientific | 2025 |
| Direct Safety NE Ltd | Other services | 2021 |
| DIS Construction Ltd | Construction | 2019 |
| Discount Equestrian UK Limited | Wholesale & retail | 2013 |
| Diva Nails 166 Ltd | Other services | 2025 |
| Diversity Network Community CIC | Education | 2026 |
| Divine Serendipity Ltd | Wholesale & retail | 2025 |
| Dixon RS (NE) Ltd | Professional & scientific | 2024 |
| DJ BAS Electrical Testing Ltd | Professional & scientific | 2026 |
| DJ Dowson Limited | Construction | 2016 |
| DJ Kitching Logistics Ltd | Transport & logistics | 2025 |
| DJ Spears Ltd | Professional & scientific | 2026 |
| DJM RA Tech Limited | Construction | 2013 |
| DJO Logistics Limited | Construction | 2014 |
| DJR GAS and Plumbing Ltd | Construction | 2021 |
| DJT Legal Consultancy Limited | Professional & scientific | 2026 |
| Dkaa IT Solutions Ltd | Information & communication | 2019 |
| DKG Housing Ltd | Construction | 2026 |
| Dlamb Ltd | Professional & scientific | 2014 |
| DLK Group International Limited | Financial services | 2024 |
| DLK Homes Limited | Real estate | 2019 |
| DLK Solutions Limited | Professional & scientific | 2011 |
| DM EHS Ltd | Professional & scientific | 2024 |
| DM NDT Inspections Limited | Construction | 2013 |
| DM Technical GAS Services Ltd | Mining & quarrying | 2023 |
| DMB Wealth Management Ltd | Financial services | 2015 |
| Dmge Rail Ltd | Construction | 2026 |
| DMH Mechanical Limited | Construction | 2016 |
| DMK Fitness Limited | Arts & recreation | 2017 |
| Dmpr Limited | Wholesale & retail | 2014 |
| DMS Elevator Ltd | Administrative & support | 2013 |
| DN Holdings Limited | Professional & scientific | 2008 |
| DNS Design Ltd | Professional & scientific | 2025 |
| DO Marinos Ltd | Hospitality | 2025 |
| Doc-U-Ment Lifecycle Ltd | Professional & scientific | 2025 |
| Doc-U-Ment Ltd | Information & communication | 2024 |
| Dodgeball World Ltd | Manufacturing | 2018 |
| Doggy Locks by L Limited | Other services | 2024 |
| Dolan & White Family Immigration Ltd | Professional & scientific | 2017 |
| Dolan Quality Solutions Limited | Professional & scientific | 2024 |