| DMW Construction Ltd | Construction | 2018 |
| DMW Industrial Painting Ltd | Construction | 2021 |
| DMX Productions Limited | Manufacturing | 2006 |
| DMZ Internet Security Limited | Information & communication | 2011 |
| DN Autogas Parts Ltd | Wholesale & retail | 2016 |
| DN Dhillon Property Ltd | Real estate | 2024 |
| DN Financial Limited | Financial services | 2015 |
| DN Property Developments Limited | Real estate | 2020 |
| DN Property Group Limited | Real estate | 2019 |
| DN Property Rentals Limited | Real estate | 2020 |
| DNA Charters Limited | Administrative & support | 2024 |
| DNA Corporate Finance Limited | Administrative & support | 2010 |
| DNA Data Ltd | Information & communication | 2011 |
| DNA Global Medical Ltd | Health & social care | 2024 |
| DNA Plus Analysis Ltd | Health & social care | 2019 |
| DNA Pro Ltd | Households | 2021 |
| DNA Security Integrations Ltd | Administrative & support | 2024 |
| DNA Sweets Ltd | Manufacturing | 2019 |
| Dnascriptrx Ltd | Health & social care | 2026 |
| DNC Desserts Ltd | Hospitality | 2026 |
| Dnds Estates Ltd | Real estate | 2020 |
| Dnds Medical Services Ltd | Other services | 2015 |
| Dnduk Ltd | Hospitality | 2021 |
| DNG Domaene NEU Gaarz Limited | Hospitality | 2017 |
| DNK Management Ltd | Households | 2019 |
| DNL Facilities Ltd | Construction | 2025 |
| Dnmuk Ltd | Information & communication | 2021 |
| Dnmws Ltd | Transport & logistics | 2018 |
| DNR Transport Ltd | Transport & logistics | 2023 |
| DNS Capital Group Ltd | Construction | 2021 |
| DNS Developers Ltd | Real estate | 2025 |
| DNS Garage Ltd | Wholesale & retail | 2025 |
| DNS Global Trades Limited | Wholesale & retail | 2025 |
| DNT Sales Ltd | Wholesale & retail | 2019 |
| Dntalyze Limited | Health & social care | 2022 |
| DO R Motors Ltd | Wholesale & retail | 2019 |
| DO Technology Ltd | Information & communication | 2013 |
| DO While (Innovative) Ltd | Information & communication | 2014 |
| DO Your Best Service Ltd. | Manufacturing | 2017 |
| Doaba Pizza Limited | Hospitality | 2023 |
| Doal and Sons Limited | Construction | 2025 |
| Doal Property Limited | Real estate | 2002 |
| DOB Trade Support Services Limited | Administrative & support | 2015 |
| Dobbs Mill Properties Limited | Real estate | 2023 |
| Dobbsons Properties Ltd | Real estate | 2025 |
| Dobhai (Holdings) Ltd | Professional & scientific | 2000 |
| Dobhai Foods Acocks Green Ltd | Hospitality | 2016 |
| Dobtho Limited | Professional & scientific | 2022 |
| DOC & Bakes Ltd | Transport & logistics | 2020 |
| DOC ARO Ltd | Health & social care | 2011 |
| DOC Property Limited | Real estate | 2023 |
| DOC. SJ Ltd | Wholesale & retail | 2023 |
| DOC31 Limited | Health & social care | 2023 |
| Dock House Park Limited | Hospitality | 2021 |
| Dockazza Locum GP Services Ltd | Health & social care | 2023 |
| Dockdale (Holdings) Limited | Financial services | 1999 |
| Dockdale Limited | Manufacturing | 1975 |
| Dockside Fresh Limited | Wholesale & retail | 2025 |
| Dockside Ventures Ltd | Hospitality | 2026 |
| Docnafiakaan Holdings Ltd | Financial services | 2024 |
| Docnafiakaan Ltd | Professional & scientific | 2024 |
| Docnafiakaan Property Ltd | Extraterritorial | 2024 |
| Docra Property Limited | Real estate | 2021 |
| Doctah Ltd | Health & social care | 2021 |
| Doctor Ahmed Ltd | Health & social care | 2023 |
| Doctor Diana Medical Centre Company Limited | Health & social care | 2004 |
| Doctor Drive Ltd | Transport & logistics | 2016 |
| Doctor Oculus Limited | Wholesale & retail | 2021 |
| Doctor P Music Ltd | Arts & recreation | 2011 |
| Doctor Skin Ltd | Administrative & support | 2018 |
| Doctor Sparx Ltd | Construction | 2023 |
| Doctors Evidence Limited | Information & communication | 2004 |
| Doctors Group Ltd | Health & social care | 2021 |
| Doctors' Direct Pharma Ltd | Administrative & support | 1998 |
| Doctraine Limited | Information & communication | 2026 |
| Docuware Ltd | Information & communication | 2005 |
| Docweb Limited | Health & social care | 2015 |
| Docwise Medics Ltd | Administrative & support | 2025 |
| Dodat Limited | Information & communication | 2016 |
| Dodds Legacy Collectives CIC | Administrative & support | 2025 |
| Dode Logistics Ltd | Transport & logistics | 2019 |
| Dodhy's Childrens Residential Home Ltd | Health & social care | 2022 |
| Dodwell Builders Limited | Extraterritorial | 2024 |
| Doel Services (Handsworth) Limited | Transport & logistics | 2024 |
| Doerbase Limited | Wholesale & retail | 2020 |
| Dofmanski Ltd | Wholesale & retail | 2019 |
| Dog House Cider Press Ltd | Manufacturing | 2017 |
| Dog Ranch Limited | Information & communication | 2019 |
| Dogeanu Celestie Ltd | Wholesale & retail | 2025 |
| Dogeanu Ltd | Wholesale & retail | 2022 |
| Doggara Limited | Health & social care | 2019 |
| Doglyness UK Limited | Other services | 2021 |
| Dogmaels Holdings Ltd | Financial services | 2026 |
| Dogra Property Ltd | Real estate | 2025 |
| Dohco Wulfrun Limited | Wholesale & retail | 2025 |
| Doherty & LEE Co Limited | Wholesale & retail | 1980 |
| Doherty and Relek Services Limited | Transport & logistics | 2018 |
| Doitnow Ltd | Administrative & support | 2023 |
| DOJ Management Ltd | Real estate | 2025 |
| Dojo's Hands Ltd | Administrative & support | 2024 |