| Davok Limited | Real estate | 2025 |
| Day & Dunn Ltd | Professional & scientific | 2020 |
| Day Property Investments Limited | Real estate | 2017 |
| Dayco UK Limited | Wholesale & retail | 2024 |
| Dayspring Healthcare Services Limited | Health & social care | 2019 |
| DB ARK Group Ltd | Professional & scientific | 2025 |
| DB ARK Ltd | Construction | 2024 |
| DB Recruit Limited | Administrative & support | 2026 |
| DBD Communications and Management Consultancy Limited | Professional & scientific | 2002 |
| DBD Services (UK) Limited | Construction | 2005 |
| Dbfirstflooring Limited | Construction | 2016 |
| DBP Capital Limited | Financial services | 2022 |
| DBS Developments Ltd | Construction | 2008 |
| DBS Maintenance Services Ltd | Administrative & support | 2022 |
| DC & FAM Construction Ltd | Construction | 2025 |
| DC & FC Properties Limited | Real estate | 2024 |
| DC Plus Utility Ltd | Construction | 2024 |
| DC Pro Solutions Ltd | Administrative & support | 2025 |
| Dcbuilds Ltd | Construction | 2014 |
| DCH Distribution Limited | Wholesale & retail | 2017 |
| DCI Construction Services Ltd | Construction | 2018 |
| Dcjm Advisors Ltd | Other services | 2023 |
| Dclr Limited | Wholesale & retail | 2018 |
| Dcmk Planning Ltd. | Professional & scientific | 2016 |
| DCN Transport Ltd | Transport & logistics | 2024 |
| Dcup Ltd | Transport & logistics | 2018 |
| DDH Consulting (Kent) Limited | Other services | 2016 |
| DDM Building Services Ltd | Construction | 2026 |
| DDM Futures Limited | Professional & scientific | 2018 |
| DDN Property Investments Limited | Real estate | 2026 |
| DDR Agencies Limited | Wholesale & retail | 1972 |
| DE LA Sole Limited | Other services | 2010 |
| Deal Merchants Limited | Wholesale & retail | 2025 |
| Dean Anthony Limited | Professional & scientific | 2023 |
| Deanog Ltd | Transport & logistics | 2026 |
| Debospat Ltd | Wholesale & retail | 2024 |
| Deck Heads Ltd | Arts & recreation | 2021 |
| Declutter Masters Ltd | Health & social care | 2015 |
| Decol Compay Ltd | Health & social care | 2022 |
| Decoline Limited | Construction | 2005 |
| Decontaminate (UK) Ltd | Other services | 2013 |
| Decorative Glass Interiors Ltd | Manufacturing | 2022 |
| Dedin's Ltd | Construction | 2019 |
| DEE Sterling Limited | Wholesale & retail | 2018 |
| Deekom Properties Ltd | Real estate | 2019 |
| Deeks & Associates Limited | Professional & scientific | 2015 |
| Deen Trading Ltd | Wholesale & retail | 2026 |
| Deep and Co Properties Limited | Real estate | 2024 |
| Deep Patel Ltd | Health & social care | 2020 |
| Deerbrook Place Management Ltd | Households | 2020 |
| Deere Rail Signalling Limited | Professional & scientific | 2023 |
| Deetee Services Ltd | Administrative & support | 2026 |
| Definitely Services Limited | Health & social care | 2021 |
| Degon Utilities Ltd | Construction | 2026 |
| Degree Plus UK Ltd | Education | 2022 |
| Dehub Ltd | Health & social care | 2019 |
| Deimante Limited | Health & social care | 2016 |
| Deirdre Mundembe Ltd | Education | 2025 |
| Dekohome Ltd | Real estate | 2026 |
| DEL Bell Services Limited | Construction | 2005 |
| Delangus Limited | Health & social care | 2022 |
| Delectus Partners Ltd | Administrative & support | 2014 |
| Delhi Delight Limited | Wholesale & retail | 2022 |
| Delhi Pizza Naan Limited | Hospitality | 2021 |
| Delice DE Dieu Ltd | Wholesale & retail | 2016 |
| Delicious Webdesign Ltd | Information & communication | 2024 |
| Delivereats Group Ltd | Wholesale & retail | 2023 |
| Delivery Today Ltd | Transport & logistics | 2026 |
| Delri Management Limited | Real estate | 2022 |
| Dels Accessories Ltd | Wholesale & retail | 2023 |
| Delta Commercial Flooring Limited | Wholesale & retail | 1983 |
| Delta Pelio Limited | Manufacturing | 2025 |
| Delta Trans Ltd | Transport & logistics | 2015 |
| Delta Web Express Ltd | Transport & logistics | 2025 |
| Deltatek Software Limited | Information & communication | 1994 |
| Dema Plus Ltd | Professional & scientific | 2021 |
| Demilade Homes Ltd | Real estate | 2023 |
| Demmac Ltd | Health & social care | 2019 |
| Dempster Pipework Fabrication Ltd | Construction | 2020 |
| Demuch Limited | Wholesale & retail | 2017 |
| Dench Developments UK Limited | Real estate | 2021 |
| Denfit Limited | Construction | 2022 |
| Dengale Management (UK) Limited | Professional & scientific | 2011 |
| Dengie Drywall Limited | Other services | 2020 |
| Dennis Automotive Services Ltd | Wholesale & retail | 2012 |
| Denya Archer Ltd | Other services | 2018 |
| Denzel Ventures Ltd | Health & social care | 2025 |
| Deonary Limited | Wholesale & retail | 2026 |
| Derata Ltd | Professional & scientific | 2016 |
| Derbyshire Engineering Ltd. | Manufacturing | 2012 |
| Dernier Empire Properties Ltd | Real estate | 2025 |
| Desibela UK Limited | Wholesale & retail | 2024 |
| Design Ceiling Systems Limited | Manufacturing | 1990 |
| Design to Print Solutions Ltd | Information & communication | 2004 |
| Designbcreative Limited | Administrative & support | 2015 |
| Designed Recruitment Ltd | Professional & scientific | 2020 |
| Designedbydayna Ltd | Arts & recreation | 2021 |
| Desiman (Clarence) Limited | Real estate | 2025 |
| Desiman 2 Limited | Real estate | 2008 |
| Desiman Limited | Real estate | 1997 |