| Cyril Alexander Property Limited | Real estate | 2023 |
| D & L Stanton Ltd | Wholesale & retail | 2017 |
| D & M Plastering Contractors Limited | Construction | 2021 |
| D & M Property Solutions Limited | Real estate | 2024 |
| D & R Build Ltd | Construction | 2022 |
| D Allison Transport Limited | Transport & logistics | 2025 |
| D and B Distributors Limited | Wholesale & retail | 2014 |
| D and T Jennings Ltd | Hospitality | 2022 |
| D C Modular Construction Ltd | Construction | 2025 |
| D Drage Contractors Ltd | Construction | 2025 |
| D E Shipp Limited | Real estate | 2020 |
| D G Building Construction Ltd | Construction | 2017 |
| D J Davison and Sons Ltd | Agriculture & fishing | 2015 |
| D J Last Builders Ltd | Construction | 2024 |
| D Lane Engineering Limited | Professional & scientific | 2021 |
| D Legacy Group Ltd | Real estate | 2026 |
| D M a Health & Safety Limited | Professional & scientific | 2007 |
| D M Coulson Limited | Construction | 2016 |
| D Marriott Electrical Services Ltd | Construction | 2021 |
| D Milton Ltd | Wholesale & retail | 2025 |
| D Normandale Limited | Agriculture & fishing | 2016 |
| D S Property Maintenance Ltd | Construction | 2022 |
| D T Bettoney Plumbing & Heating Ltd | Construction | 2012 |
| D Taylor Property Limited | Real estate | 2018 |
| D&G Mechanical Solutions Limited | Manufacturing | 2011 |
| D&L Property Management Ltd | Real estate | 2026 |
| D&Y Tutoring Services Ltd | Education | 2019 |
| D-Bukah Integrated Services Ltd | Wholesale & retail | 2026 |
| D-Infiniti Ltd. | Information & communication | 2016 |
| D.C Futures Ltd | Professional & scientific | 2023 |
| D.Hudson Properties Limited | Real estate | 2025 |
| D.J. Haill Ltd | Construction | 2011 |
| D.Poynter Fuel Engineering Ltd | Professional & scientific | 2022 |
| D.W.P.Gough & Co Limited | Agriculture & fishing | 1956 |
| D.W.T Mechanical Services Ltd | Wholesale & retail | 2026 |
| D2 Creative Design Limited | Manufacturing | 2005 |
| D2E Talent Solutions Limited | Professional & scientific | 2025 |
| D5 Systems Ltd | Information & communication | 2019 |
| DA Global Services Ltd | Information & communication | 2025 |
| DA Training Ltd | Education | 2025 |
| DAB Pharma Innovations Limited | Professional & scientific | 2020 |
| DAC IT Ltd | Information & communication | 2026 |
| DAD and Daughters Pizza Ltd | Hospitality | 2023 |
| Daedalus (Holdings) Limited | Professional & scientific | 2014 |
| Daffarn Consulting Ltd | Professional & scientific | 2026 |
| Daffodil PPE Ltd | Wholesale & retail | 2021 |
| Daheca Holdings Ltd | Financial services | 2020 |
| Daijin Holdings Limited | Administrative & support | 2023 |
| Daily Deposits Limited | Information & communication | 2026 |
| Daily Mart DOT UK Ltd | Wholesale & retail | 2024 |
| Daintree Properties Ltd | Real estate | 2023 |
| Daisy Stores Ltd | Wholesale & retail | 2017 |
| Daivy Investments Ltd. | Real estate | 2015 |
| Dakgb Onafeko International Ltd | Arts & recreation | 2026 |
| Dala Group Ltd | Wholesale & retail | 2025 |
| Dala-Accountants Limited | Professional & scientific | 2024 |
| Daly Connect Ltd | Transport & logistics | 2017 |
| DAM Core Limited | Administrative & support | 2024 |
| Damianna Limited | Hospitality | 2023 |
| Damilare Media Ltd | Information & communication | 2025 |
| Damon Hilliard Architecture Ltd | Professional & scientific | 2019 |
| Damree Properties Company Ltd | Real estate | 2026 |
| Damtos Limited | Health & social care | 2022 |
| DAN Alexander Ltd | Wholesale & retail | 2024 |
| DAN Christian Limited | Professional & scientific | 2011 |
| Dance Camp North Ltd | Arts & recreation | 1998 |
| Dance Dynamite Academy Ltd | Arts & recreation | 2018 |
| Dandelion Catering Limited | Hospitality | 2014 |
| Dandelion Education Limited | Education | 2014 |
| Dandelion Farm CIC | Agriculture & fishing | 2026 |
| Dandelion Hire LLP | | 2016 |
| Dandling Ltd | Real estate | 2021 |
| Dangoormendel Ltd | Professional & scientific | 2019 |
| Dani Pro Services Ltd | Construction | 2025 |
| Daniel Gosling Limited | Education | 2025 |
| Daniel Latto Digital Marketing Agency Limited | Administrative & support | 2012 |
| Daniel's Kitchen Community Interest Company | Hospitality | 2023 |
| Danielz Ltd | Information & communication | 2024 |
| DANISDELIGHTS7 Ltd | Wholesale & retail | 2026 |
| Dankslapz Ltd | Manufacturing | 2026 |
| Danok Investment Limited | Financial services | 2024 |
| Danso Produced Limited | Information & communication | 2021 |
| Danson Property Limited | Real estate | 2024 |
| Dansonpropertysolutions Ltd | Real estate | 2025 |
| Dapa Coffee Formby Ltd | Hospitality | 2021 |
| Daphne Palace Limited | Households | 2025 |
| Daqian Studio Ltd | Wholesale & retail | 2025 |
| Dardav Ltd | Hospitality | 2020 |
| Darey Asset Management Ltd | Real estate | 2020 |
| Darey Consulting Ltd | Professional & scientific | 2019 |
| Daria Hobbycraft Ltd | Wholesale & retail | 2025 |
| Dark Horse Mots Ltd | Wholesale & retail | 2025 |
| Darkshift Interactive Ltd | Information & communication | 2022 |
| Darmus Ltd | Wholesale & retail | 2024 |
| Darnley Properties Limited | Real estate | 1993 |
| Darrasindex Ltd | Professional & scientific | 2025 |
| Darren Tester Building Contractor Ltd | Construction | 2016 |
| Darwin Data Ltd | Administrative & support | 2011 |
| Darwin Drive Limited | Real estate | 2024 |
| DAS Marketing Solutions Ltd | Information & communication | 2025 |