| D-Tag Services Ltd | Construction | 2024 |
| D. Oakley Limited | Construction | 2017 |
| D.A.L Coatings Ltd | Construction | 2025 |
| D.A.S. Solutlons Ltd | Administrative & support | 2018 |
| D.Eales Electrical Services Ltd | Construction | 2021 |
| D.F Industrial Services Ltd | Manufacturing | 2025 |
| D.H Comunications Ltd | Information & communication | 2020 |
| D.K. Jones Limited | Wholesale & retail | 1983 |
| D.M. Peel Joiners & Builders Limited | Construction | 2003 |
| D.Nevison Ltd | Construction | 2019 |
| D.O Bathroom Fitting Ltd | Construction | 2025 |
| D.O Joinery Ltd | Manufacturing | 2021 |
| D.O Kitchen Fitting Ltd | Manufacturing | 2023 |
| D365 Solutions (NE) Ltd | Information & communication | 2023 |
| DA Lettings Ltd | Real estate | 2024 |
| DA Offshore Services Ltd | Professional & scientific | 2022 |
| Daac Fabrications Limited | Manufacturing | 2017 |
| Dabi Homes Ltd | Real estate | 2025 |
| DAC Engineering Services Ltd | Professional & scientific | 2018 |
| Daflavourz Ltd | Manufacturing | 2023 |
| Daggett Inspection & Integrity Services Ltd | Professional & scientific | 2026 |
| Dainty Grace Ltd | Wholesale & retail | 2024 |
| Daizey Chain Daycare Ltd | Other services | 2015 |
| DAJ Access & Coatings Limited | Professional & scientific | 2015 |
| DAJ Mechanical Site Services Ltd. | Professional & scientific | 2021 |
| Dallas Ventures Ltd | Transport & logistics | 2026 |
| Dalton & Carne Properties Limited | Real estate | 2023 |
| Daltonphilipjarvis Limited | Administrative & support | 2014 |
| Dalīl Group Limited | Information & communication | 2026 |
| DAM Doors Ltd | Construction | 2024 |
| Damada Fashion Limited | Wholesale & retail | 2024 |
| Damienharrison Ltd. | Professional & scientific | 2015 |
| Damir Painters Ltd | Construction | 2025 |
| DAN Cleaning Ltd | Administrative & support | 2025 |
| Dance for Your School Ltd | Education | 2023 |
| Dancharl Limited | Professional & scientific | 2010 |
| Dandy Cichlids Ltd | Wholesale & retail | 2012 |
| Dangerous Penguin Limited | Professional & scientific | 2012 |
| Dani Rentals Ltd | Transport & logistics | 2026 |
| Dani Star Cleaning Limited | Administrative & support | 2025 |
| Daniel GRF Delivery Ltd | Transport & logistics | 2025 |
| Daniel Henry Barbershop Limited | Other services | 2020 |
| Daniella Johnson Property & Co Ltd | Financial services | 2026 |
| Daniiiii Limited | Wholesale & retail | 2025 |
| Danmullen Services Ltd | Construction | 2025 |
| Danny Buoy Limited | Construction | 2018 |
| Danny G Ltd | Construction | 2025 |
| Danq & Co Ltd | Hospitality | 2026 |
| Danyal D M Property Ltd | Real estate | 2024 |
| Danyela Trans Ltd | Transport & logistics | 2025 |
| DAR Properties (N/E) Ltd | Real estate | 2013 |
| Darbist Limited | Wholesale & retail | 2015 |
| Dark Atomic Limited | Arts & recreation | 2015 |
| Darley J Limited | Wholesale & retail | 2021 |
| Darling Weddings Ltd | Administrative & support | 2025 |
| Darmansaz & ASO Limited | Wholesale & retail | 2018 |
| Darraa Ltd | Wholesale & retail | 2024 |
| Darren Hood Limited | Information & communication | 2017 |
| Darren Kelly Transport Limited | Transport & logistics | 2008 |
| Dartsanvil Ltd | Information & communication | 2026 |
| DAS SOLUT1ONS Limited | Information & communication | 2016 |
| Dasc Services Limited | Other services | 2018 |
| Daseys Limited | Hospitality | 2023 |
| Datacom-Net Limited | Information & communication | 2009 |
| Daughter and DAD Cleaning Ltd | Administrative & support | 2025 |
| Dave Brown Services Limited | Professional & scientific | 2007 |
| Dave Clark Technical Solutions Limited | Wholesale & retail | 2019 |
| Dave Noble Services Limited | Professional & scientific | 2026 |
| Dave Smiley Limited | Construction | 2015 |
| David Duffield Limited | Professional & scientific | 2007 |
| David Gray Electrical Ltd | Construction | 2023 |
| David Gray Properties Limited | Hospitality | 2016 |
| David Murray Safety Consultants Limited | Professional & scientific | 2017 |
| David Price (Whitby) Limited | Agriculture & fishing | 2008 |
| David Sefora Ltd | Transport & logistics | 2026 |
| David Silk Solutions Limited | Professional & scientific | 2022 |
| David Turner Mechanical Engineering Ltd | Professional & scientific | 2025 |
| David&Arjana Marine Limited | Manufacturing | 2025 |
| David’S Painting and Decorating Services Limited | Construction | 2024 |
| Davito Musicals Ltd | Education | 2025 |
| Dawkinsltd Ltd | Construction | 2026 |
| Dawson (Tees Wharf) Limited | Extraterritorial | 1993 |
| Dazzle ME Fashion Ltd | Wholesale & retail | 2025 |
| DB Offshore Renewables Ltd | Manufacturing | 2023 |
| Dbndt Inspection Services Ltd | Professional & scientific | 2025 |
| Dbsp Commercials Limited | Wholesale & retail | 2024 |
| Dbsp Properties Limited | Real estate | 2025 |
| Dbspace Property Limited | Real estate | 2025 |
| DC Daniels Dental Limited | Health & social care | 2025 |
| DC Dumitru Logistics Limited | Transport & logistics | 2025 |
| DC Flooring NE Ltd | Wholesale & retail | 2023 |
| DC Industrial Services Ltd | Construction | 2026 |
| DC Property Solutions Limited | Construction | 2024 |
| DC22 Consultancy Ltd | Construction | 2016 |
| Dccscaffolding Ltd | Construction | 2019 |
| DCE Fabrications Limited | Professional & scientific | 2014 |
| DCF Developments Ltd | Construction | 2023 |
| DCH Property Maintenance Ltd | Construction | 2024 |
| DDS Safety Ltd | Construction | 2025 |
| DE Alpha Fashion Empire Ltd | Manufacturing | 2025 |