| D&A Plumbing and Heating Services Limited | Construction | 2026 |
| D&A-Painting&Decorating Ltd | Construction | 2021 |
| D&C Lanka Limited | Information & communication | 2011 |
| D&C Plant Ltd | Administrative & support | 2026 |
| D&D M.T. Ltd. | Transport & logistics | 2022 |
| D&D Precision Ductwork Ltd | Construction | 2025 |
| D&I Colour Ltd | Construction | 2022 |
| D&J Foods Ltd | Hospitality | 2025 |
| D&M Carpentry Ltd | Construction | 2020 |
| D&M Mission Critical Services Ltd | Construction | 2025 |
| D&N Real Estate Limited | Real estate | 2022 |
| D&R Building Contractors Ltd | Construction | 2023 |
| D&R Decorating Ltd | Construction | 2022 |
| D&T Advanced Glazing Ltd | Construction | 2018 |
| D&Tola Construction Ltd | Construction | 2018 |
| D&V Real Estate Ltd | Real estate | 2026 |
| D'Anconia Ltd | Other services | 2007 |
| D. Leader Limited | Information & communication | 2000 |
| D.B.M.C. Ltd | Information & communication | 1996 |
| D.I.L. Management Limited | Extraterritorial | 2013 |
| D.I.T Build Ltd | Construction | 2023 |
| D.L.O. Rail Ltd | Construction | 2017 |
| D.N.G Roofing Limited | Construction | 2026 |
| D.Poenaru Ltd | Construction | 2016 |
| D.R.S General Builder Limited | Construction | 2019 |
| D20 Board Game Cafe Ltd | Wholesale & retail | 2016 |
| D2D Enterprise Ltd | Transport & logistics | 2025 |
| D2D Express Limited | Transport & logistics | 2022 |
| D2H Enterprise Ltd | Wholesale & retail | 2025 |
| D2K Ventures Limited | Real estate | 2025 |
| D3T Capital Ltd | Professional & scientific | 2022 |
| D3T Holdings Ltd | Financial services | 2022 |
| DA Hub Ltd | Wholesale & retail | 2025 |
| DA Moreno Ltd | Hospitality | 2017 |
| DA Propco Ltd | Real estate | 2025 |
| DA Silva Building and Construction Limited | Construction | 2013 |
| DAA Electrical Ltd | Construction | 2011 |
| Daarf Solutions Limited | Wholesale & retail | 2015 |
| DAB Carpentry & Joinery Limited | Construction | 2012 |
| DAC Construction Services Ltd | Construction | 2016 |
| Dacag Limited | Construction | 2025 |
| Dach Properties ( PVT) Ltd | Real estate | 2022 |
| Dacia Distribution Ltd | Transport & logistics | 2022 |
| Dad's Garage Accident Repairs Ltd | Wholesale & retail | 2024 |
| Dad’S Garden Ltd | Professional & scientific | 2021 |
| Daily Factory Limited | Wholesale & retail | 2023 |
| Daily Finds Ltd | Wholesale & retail | 2023 |
| Daily Ritual POD Limited | Arts & recreation | 2022 |
| Dailyies Ltd | Information & communication | 2025 |
| Dairy Maid (Aylesbury) Ltd | Hospitality | 2020 |
| Dairy Mews (Management) 1994 Limited | Professional & scientific | 1994 |
| Dairyman Close Investment Co. Limited | Administrative & support | 2000 |
| Daiso Limited | Real estate | 2025 |
| Daisy SC Limited | Professional & scientific | 2019 |
| Dajaroo Limited | Administrative & support | 2010 |
| Daksh IT Consulting Ltd | Information & communication | 2014 |
| Dakshara Infotech Ltd | Information & communication | 2022 |
| Daku Solutions Ltd | Construction | 2025 |
| Dalator Ltd | Professional & scientific | 2023 |
| Dalberg Integro LLP | | 2012 |
| Dale and Warren Limited | Administrative & support | 2017 |
| Daley Design Ltd | Professional & scientific | 2024 |
| Daley Transport Limited | Transport & logistics | 2017 |
| Dalkri Ltd | Professional & scientific | 2019 |
| Dalonia Limited | Information & communication | 2023 |
| Dalston DEN B Ltd | Hospitality | 2021 |
| Daltec AI Limited | Manufacturing | 2007 |
| Daly Business Solutions Limited | Professional & scientific | 2014 |
| Damasen Limited | Wholesale & retail | 2012 |
| Damiar UK Ltd | Hospitality | 2025 |
| Damilot Services Limited | Administrative & support | 2012 |
| Dampcure Woodcure /30 Limited | Construction | 1967 |
| Damyanti Enterprise Ltd | Wholesale & retail | 2025 |
| DAN & Co Builders Limited | Construction | 2015 |
| Dana's Oven Ltd | Hospitality | 2025 |
| Dandavcare Ltd | Health & social care | 2023 |
| Danes Court Residents Association (Northwood) Limited | Real estate | 1984 |
| Dani Rajan Photography Ltd | Information & communication | 2024 |
| Daniel Austin Ltd | Administrative & support | 2022 |
| Daniel Vasilescu Haulage Ltd | Transport & logistics | 2021 |
| Daniella Campbell Ltd | Extraterritorial | 2019 |
| Daniels & Joinery Ltd | Construction | 2025 |
| Danihib Limited | Real estate | 2025 |
| Danimax Property Investment Ltd | Real estate | 2025 |
| Danslow Installations Limited | Construction | 2017 |
| Danton Management Limited | Professional & scientific | 2013 |
| Daoflowers Limited | Wholesale & retail | 2014 |
| DAP Accounting Ltd | Professional & scientific | 2018 |
| Dapapod Ltd | Manufacturing | 2019 |
| Dapper Trading Ltd | Administrative & support | 2013 |
| Dappled Apple Ltd. | Financial services | 2019 |
| Dappros Ltd | Information & communication | 2018 |
| Dara Associates Ltd | Professional & scientific | 2011 |
| Darcoron Consulting Limited | Professional & scientific | 2020 |
| Dare to Dream Academy CIC | Education | 2023 |
| Dare to Dream Coaching Limited | Professional & scientific | 2025 |
| Daribi Asset Management Ltd | Wholesale & retail | 2026 |
| Dario Hand Car Wash Ltd | Other services | 2023 |
| Dariottiart Limited | Arts & recreation | 2021 |
| Dark Notion Ltd | Wholesale & retail | 2024 |