| Diamond Offshore Enterprises Limited | Administrative & support | 2008 |
| Diamond Offshore Limited | Mining & quarrying | 1968 |
| Diamond RIG Investments Limited | Administrative & support | 2008 |
| Diamond Star Halo Ltd | Information & communication | 2021 |
| Diana a Marini Limited | Professional & scientific | 2014 |
| Dide Properties Ltd | Real estate | 2023 |
| Different Homes Limited | Real estate | 2017 |
| Digit Enterprise Analytics Tech Limited | Administrative & support | 2018 |
| Digital Analytics Experts Limited | Information & communication | 2025 |
| Digital First Holdings UK Limited | Information & communication | 2024 |
| Digital Health Consultancy Limited | Administrative & support | 2022 |
| Digital Innovative Strategies Consultancy Ltd | Professional & scientific | 2023 |
| Digital Land & Development Limited | Real estate | 2023 |
| Digital Lifeline Ltd | Information & communication | 2025 |
| Digital Magic Limited | Information & communication | 1995 |
| Digital Rewards Group Limited | Arts & recreation | 2014 |
| Digital Software and Services Ltd | Information & communication | 2026 |
| Digital SS Limited | Information & communication | 2018 |
| Digital Workroom Ltd | Information & communication | 2012 |
| DIGITAL4ALL Limited | Information & communication | 2022 |
| Dilax Systems UK Limited | Transport & logistics | 2007 |
| Dileep Adapala Limited | Administrative & support | 2012 |
| Diligens Consulting Limited | Administrative & support | 2024 |
| Dilla Academy Limited | Education | 2023 |
| Dilla Barbershop Limited | Other services | 2022 |
| Dilla Group Limited | Financial services | 2025 |
| Dilworth's (Fishmongers) Limited | Wholesale & retail | 2010 |
| Dimension Group Ltd | Financial services | 2026 |
| Dingle Bank Management Company Limited | Households | 1986 |
| Dingle Court (Chorlton) Management Company Ltd | Administrative & support | 2014 |
| Dingle Lodge Management Company Limited | Real estate | 2005 |
| Dinise Limited | Real estate | 2024 |
| Dinwoodie Engineering Services Limited | Professional & scientific | 2019 |
| Dippie & Bain Limited | Wholesale & retail | 2024 |
| Direct Accident Claim Assistance Limited | Administrative & support | 2008 |
| Direct Carpets and Flooring (Northwest) Limited | Wholesale & retail | 2014 |
| Direct Cooling Limited | Manufacturing | 2000 |
| Direct Fish Limited | Wholesale & retail | 2003 |
| Direct Locums Limited | Health & social care | 2010 |
| Direct Residence Limited | Real estate | 2021 |
| DIRECT2CONSUMER Ltd | Professional & scientific | 2013 |
| Dirigent BIO UK Limited | Professional & scientific | 2025 |
| Disa Global Solutions Ltd | Administrative & support | 2025 |
| Discount Sheds Limited | Manufacturing | 2014 |
| Discretionplus Ltd | Professional & scientific | 2023 |
| Display Lighting Limited | Manufacturing | 1999 |
| Dissolve Debt Limited | Financial services | 2004 |
| Distinguished Programs (UK) Limited | Financial services | 2026 |
| Distinguished UK Holdco Limited | Financial services | 2026 |
| Distractive Media UK Limited | Information & communication | 2026 |
| Distributed Creation UK Limited | Professional & scientific | 2018 |
| District Capital Ltd | Real estate | 2022 |
| Divergence Labs Ltd. | Professional & scientific | 2025 |
| Diverse Horizons Limited | Other services | 2025 |
| Diverse Pursuits Limited | Other services | 2025 |
| Divya Divine Enterprise Ltd | Information & communication | 2024 |
| Dixon Court (Chelford) Management Company Limited | Households | 2004 |
| Diya Connect Limited | Professional & scientific | 2024 |
| DJ Roofing Manchester Ltd | Construction | 2026 |
| DJA IT Solutions Limited | Information & communication | 2012 |
| DJB Accounting (Altrincham) Ltd | Professional & scientific | 2023 |
| Djbrooks Construction Limited | Construction | 2010 |
| DJF Projects Ltd | Construction | 2025 |
| Djptek Limited | Professional & scientific | 2026 |
| DJS Construction (Timperley) Limited | Construction | 2021 |
| DJT Marketing Ltd | Financial services | 2021 |
| DJW Technical Consultancy Services Limited | Professional & scientific | 2023 |
| DK 8 Investments Limited | Financial services | 2023 |
| DK Cloud Solutions Limited | Information & communication | 2017 |
| DKF Group Ltd | Professional & scientific | 2022 |
| DKF Recruitment Ltd | Administrative & support | 2014 |
| DKR Electrical Ltd | Extraterritorial | 2021 |
| DKS05 Limited | Real estate | 2019 |
| DLD (Manchester) Limited | Real estate | 2024 |
| DLD (Merry) Limited | Real estate | 2024 |
| DLD (Salford) Limited | Real estate | 2024 |
| DLL Finance (UK) Limited | Financial services | 2020 |
| DM Biopharm Consultancy Ltd | Professional & scientific | 2021 |
| DM Cheshire Limited | Hospitality | 2026 |
| DM Techcon Limited | Administrative & support | 2008 |
| DMC Mining Services (UK) Ltd | Mining & quarrying | 2017 |
| Dmci Limited | Professional & scientific | 2025 |
| Dmlb Limited | Hospitality | 2019 |
| DMR Investco Limited | Other services | 2026 |
| Dmstats Limited | Information & communication | 2022 |
| DNL & Associates Limited | Professional & scientific | 2011 |
| DNL Engineering Solutions Ltd | Professional & scientific | 2017 |
| DNS Consultants Limited | Professional & scientific | 2025 |
| DO Something NOW | Health & social care | 2018 |
| Do'C Wealth Management Limited | Financial services | 2016 |
| Do-Re-Mi Singing Ltd | Administrative & support | 2016 |
| Doctolib UK Holdco Limited | Financial services | 2026 |
| Doctor Alexander James Limited | Health & social care | 2024 |
| Doctorash Ltd | Health & social care | 2015 |
| Doctors Care Ltd | Real estate | 2016 |
| Docuchat AI 1 Ltd | Information & communication | 2025 |
| Docuchat AI Limited | Information & communication | 2025 |
| Docxplains Ltd | Health & social care | 2014 |
| Doddys UK Limited | Administrative & support | 2010 |
| Dog Meats Bone Ltd | Wholesale & retail | 2021 |