| Douglas Golf Co Ltd | Wholesale & retail | 2025 |
| Dove's Worldwide Ltd | Other services | 2021 |
| Dovedale Associates Limited | Real estate | 2002 |
| Dovernek Limited | Professional & scientific | 2020 |
| Dovetail Bathrooms & Kitchens Ltd | Construction | 2025 |
| DOW Harris Business Solutions Limited | Administrative & support | 2017 |
| Downswood Consulting Ltd | Information & communication | 2024 |
| DP Services 2025 Ltd | Other services | 2025 |
| DPJ Consultants Limited | Construction | 2023 |
| DPJ Electrical & Plant Services Ltd | Construction | 2015 |
| DPR Drilling Services Ltd | Construction | 2012 |
| DPT Dent Ltd | Health & social care | 2026 |
| DR Family Ltd | Wholesale & retail | 2023 |
| DR Hejab Butt Ltd | Health & social care | 2026 |
| DR Luke F Smith Acute Medicine Limited | Health & social care | 2025 |
| DR Sarah J Musgrave Ltd | Health & social care | 2024 |
| DR Steer Consulting Limited | Health & social care | 2014 |
| DR Zayn Limited | Health & social care | 2024 |
| Dragon Property Maintenance Services Ltd | Construction | 2020 |
| Drake & Fletcher,Limited | Financial services | 1926 |
| Drakefields Holdings Limited | Agriculture & fishing | 2025 |
| Drakemoor Limited | Construction | 2018 |
| Drakemoor Property Investments Limited | Construction | 2020 |
| Drapers View Management Limited | Households | 2022 |
| Draughting Services (Kent) Ltd | Administrative & support | 2007 |
| Draw the Line Productions Limited | Information & communication | 2014 |
| DRB Building Services Ltd | Construction | 2015 |
| Dream 5D Limited | Financial services | 2012 |
| Dream Barni Trans Ltd | Transport & logistics | 2026 |
| Dream Nannies Ltd | Other services | 2019 |
| Dream Star Management Ltd | Arts & recreation | 2022 |
| Dream Travel DO Ltd | Information & communication | 2019 |
| Dreamer,Maker,Taker Ltd | Wholesale & retail | 2023 |
| Dreamhaunt Ltd | Health & social care | 2022 |
| Dreamline Logistics Ltd | Transport & logistics | 2021 |
| Dreamyland Landscapes Ltd | Professional & scientific | 2024 |
| Dredge Records Limited | Information & communication | 2009 |
| Dri-Er Ltd | Administrative & support | 2015 |
| Dri-Vr Holdings Limited | Professional & scientific | 2017 |
| Drillbuddy UK Ltd | Wholesale & retail | 2020 |
| Driscoll's Genetics Limited | Professional & scientific | 2006 |
| Driscoll's UK Group Limited | Wholesale & retail | 2023 |
| Drive GG Ltd | Transport & logistics | 2016 |
| Drive Health and Fitness (Kent) Limited | Arts & recreation | 2024 |
| Drive MW Ltd | Transport & logistics | 2015 |
| Driver Lorry Limited | Transport & logistics | 2016 |
| Drla Consultancy Ltd | Professional & scientific | 2024 |
| Drme Clinix Limited | Health & social care | 2018 |
| Drozdac Engineering Ltd | Manufacturing | 2023 |
| Drream Closet UK Limited | Wholesale & retail | 2025 |
| DRS Roofing Ltd | Construction | 2021 |
| DRW Plastering & Rendering Ltd | Construction | 2025 |
| DRY Home Solutions Limited | Construction | 2015 |
| Dryer & Hoffman Limited | Wholesale & retail | 1954 |
| Dryly Twist Ltd | Wholesale & retail | 2025 |
| Drywall Aptitude Limited | Information & communication | 2014 |
| Drywall Ceiling Limited | Construction | 2024 |
| DS Delivery Services Ltd | Transport & logistics | 2026 |
| DS2 Films Limited | Information & communication | 2026 |
| DSB Accounting Limited | Professional & scientific | 2005 |
| Dsco Enterprises UK Limited | Other services | 2020 |
| DSD-211018 Ltd | Transport & logistics | 2019 |
| Dsear RA Ltd | Financial services | 2017 |
| Dsga Ltd | Transport & logistics | 2019 |
| DSK Trans Ltd | Transport & logistics | 2025 |
| DSL Group Holdings Limited | Financial services | 2016 |
| Dsls Trading Limited | Professional & scientific | 2021 |
| DSM Consulting Ltd | Real estate | 2024 |
| DSM Real Estates Ltd | Construction | 2025 |
| DSN Painting Services Ltd | Construction | 2019 |
| Dspem Ltd | Administrative & support | 2021 |
| Dsquare Property Limited | Households | 2019 |
| DT Advisory Ltd | Professional & scientific | 2024 |
| DT Design Engineering Limited | Professional & scientific | 2022 |
| DT Environmental Ltd | Administrative & support | 2018 |
| DT Technical Services Ltd. | Professional & scientific | 2004 |
| DTG & DAD Ltd | Agriculture & fishing | 1993 |
| Dtnrg Limited | Professional & scientific | 2017 |
| Dual Electric Limited | Professional & scientific | 2021 |
| Dual Security Services Limited | Administrative & support | 2002 |
| Dublin 2027 Ltd | Professional & scientific | 2026 |
| Dubster Ltd | Information & communication | 2025 |
| Duck and Blade Butchery Ltd | Wholesale & retail | 2020 |
| Duckhouse Productions Limited | Other services | 2018 |
| Dude & Arnette Property Refurbishment Ltd | Administrative & support | 1999 |
| Dulwich Boiler Care Limited | Construction | 2013 |
| Dumebi Consulting Ltd | Public administration | 2019 |
| DUMI94 Ltd | Transport & logistics | 2018 |
| Dunamis Mind Ltd | Professional & scientific | 2011 |
| Dunandusted Limited | Financial services | 2011 |
| Duncan Brothers Group Limited | Financial services | 2025 |
| Duncan Holdings Ltd | Real estate | 1919 |
| Duncans Carpentry & Construction Ltd | Construction | 2019 |
| Dunes Tranport Ltd | Transport & logistics | 2017 |
| DUNEV2022 Ltd | Transport & logistics | 2022 |
| Dunn Stone Mason Limited | Manufacturing | 2025 |
| Dunn's Artisan Bakers Limited | Manufacturing | 2017 |
| Dunne Property Group Ltd | Construction | 2024 |
| Dunns (Crouch END) Limited | Manufacturing | 1928 |
| Durlestone Limited | Professional & scientific | 2007 |