| Dmkx Ltd | Health & social care | 2022 |
| DML Capital Ltd | Financial services | 2025 |
| DML Investments Holding Ltd | Financial services | 2024 |
| DMN Good Limited | Hospitality | 2023 |
| Dmoon Urol Ltd | Health & social care | 2026 |
| DMR Cladding and Facades Ltd | Construction | 2016 |
| DMR Consultancy Limited | Professional & scientific | 2012 |
| Dmrn Ltd | Construction | 2025 |
| DMS Auto Ltd | Wholesale & retail | 2025 |
| DMS Building Developments Limited | Construction | 2022 |
| DMS Commercial Services Ltd | Transport & logistics | 2023 |
| DMS Electrical Installations Limited | Construction | 2016 |
| DMS Electrical Limited | Administrative & support | 2002 |
| DMS Estates MCR Ltd | Real estate | 2026 |
| DMS Medical Legal Services Ltd | Health & social care | 2023 |
| DMS Mortgage & Protection Ltd | Financial services | 2025 |
| DMS Promotions Limited | Wholesale & retail | 2012 |
| DMS Property Build Ltd | Construction | 2025 |
| DMS Transport Solutions Ltd | Transport & logistics | 2023 |
| DMS1 Group Ltd | Administrative & support | 2023 |
| DMT Cargo & Logistics Ltd | Transport & logistics | 2025 |
| DMT Developers Ltd | Real estate | 2025 |
| DMT Installations Ltd | Professional & scientific | 2024 |
| DMT International Ltd | Administrative & support | 2023 |
| DN Construction Management Ltd | Construction | 2017 |
| DN Consultancy Limited | Administrative & support | 2019 |
| DN Fitness Supplies Limited | Wholesale & retail | 2021 |
| DN Photo Ltd | Professional & scientific | 2021 |
| DNA Clinics & Care Ltd | Health & social care | 2023 |
| DNA Clothing Limited | Wholesale & retail | 2024 |
| DNA Empire Ltd | Manufacturing | 2024 |
| DNA Events Belfast Ltd | Other services | 2024 |
| DNA Gaming Ltd | Arts & recreation | 2013 |
| DNA Integrated Services Ltd | Wholesale & retail | 2026 |
| DNA Properties and Services Ltd | Real estate | 2025 |
| DNA Property Solutions Limited | Construction | 2018 |
| DNA Publishing Limited | Wholesale & retail | 2006 |
| DNA Services Ltd | Professional & scientific | 2001 |
| Dnata Catering Services Limited | Professional & scientific | 2010 |
| Dnata Catering UK Limited | Wholesale & retail | 2012 |
| DNB Archdesign Ltd | Professional & scientific | 2024 |
| DNB Building Services Ltd | Construction | 2013 |
| DNB Construction Ltd | Construction | 2025 |
| DNB Homes Limited | Real estate | 2023 |
| DND Daily UK Ltd | Administrative & support | 2021 |
| DND Developments Ltd | Real estate | 2016 |
| DND Investments (NW) Ltd | Real estate | 2024 |
| DND Management Services Ltd | Professional & scientific | 2023 |
| DNE Properties Ltd | Real estate | 2018 |
| DNG Production & Event Crew Limited | Arts & recreation | 2013 |
| Dngpec Ltd | Arts & recreation | 2020 |
| DNH Travel Limited | Transport & logistics | 2019 |
| Dnjss Property Ltd | Real estate | 2021 |
| DNM Health Care Services Ltd | Administrative & support | 2011 |
| DNO Prime Estates Ltd | Real estate | 2024 |
| DNP Food Limited | Hospitality | 2019 |
| DNP Stores Ltd | Wholesale & retail | 2016 |
| DNP Wholesale Ltd | Wholesale & retail | 2024 |
| DNR Management Company Limited | Households | 2019 |
| DNS Systems Ltd | Administrative & support | 2020 |
| DNT Holdings Limited | Financial services | 2021 |
| DNW Limited | Health & social care | 2015 |
| DNY Creative Ltd | Wholesale & retail | 2018 |
| DNZ Properties Ltd | Real estate | 2022 |
| DO Bhai Worldwide Ltd | Wholesale & retail | 2026 |
| DO EAT Manchester Ltd | Hospitality | 2026 |
| DO Group Creative Limited | Professional & scientific | 2025 |
| DO IT (Maintenance & Management) Ltd | Administrative & support | 2017 |
| DO IT Ourselves Recordings Ltd | Information & communication | 2023 |
| DO What YOU Love Limited | Education | 2009 |
| DO Your Best Records Ltd | Information & communication | 2021 |
| Doan Ventures Limited | Wholesale & retail | 2020 |
| Doaura Ltd | Information & communication | 2026 |
| DOB Pharma Ltd | Professional & scientific | 2025 |
| Dobac Limited | Information & communication | 2024 |
| Dobcross PUB Company Ltd | Hospitality | 2020 |
| Dobest Ltd | Wholesale & retail | 2023 |
| Dobray Ltd | Information & communication | 2023 |
| Dobrev DRY Lining Limited | Construction | 2015 |
| Dobry Limited | Wholesale & retail | 1994 |
| Dobry Sklep Eccles Ltd | Wholesale & retail | 2022 |
| DOC Funk Productions Limited | Arts & recreation | 2024 |
| Docblocks Ltd | Wholesale & retail | 2025 |
| Docelarstays Ltd | Hospitality | 2025 |
| Dockerty & Sons Scaffolding Ltd | Construction | 2026 |
| Docket Limited | Administrative & support | 2014 |
| Docklands Logistics (Europe) Limited | Transport & logistics | 2004 |
| Dockside Capital Ltd | Real estate | 2025 |
| Dockstone Ltd | Hospitality | 2026 |
| Dockyard Trading Limited | Water & waste | 2025 |
| Dockydock Marine International Ltd | Manufacturing | 2020 |
| Docmarkus Ltd | Extraterritorial | 2024 |
| Doctazzy Limited | Health & social care | 2016 |
| Doctengo Limited | Wholesale & retail | 2024 |
| Doctor Bewell Health Assistance and Advisor Ltd | Professional & scientific | 2021 |
| Doctor Body Care Ltd | Wholesale & retail | 2021 |
| Doctor Brown's Bar Limited | Hospitality | 2025 |
| Doctor Certified Ltd | Health & social care | 2025 |
| Doctor Cost Limited | Administrative & support | 2010 |
| Doctor Medico-Legal Services Ltd | Administrative & support | 2019 |