| Daynight Accessories Limited | Wholesale & retail | 2021 |
| Daynite Care Service Limited | Health & social care | 2016 |
| Dayyan Y MNA Distribuidores Ltd | Wholesale & retail | 2013 |
| Dazzle Nails Limited | Other services | 2015 |
| DB & JAY Limited | Real estate | 2024 |
| DB Brands Limited | Wholesale & retail | 2002 |
| DB Care Ltd | Health & social care | 2026 |
| DB Traders Ltd | Administrative & support | 2016 |
| DBK Ltd | Construction | 2025 |
| DBM Medical Services Ltd | Health & social care | 2026 |
| DBM Medicals Limited | Wholesale & retail | 2011 |
| Dbphair Ltd | Other services | 2021 |
| Dbro Enterprises Ltd | Wholesale & retail | 2019 |
| DBW Construction Businesses Ltd | Construction | 2026 |
| DC Advisory Limited | Professional & scientific | 2019 |
| DC Dampcure British Bond Ltd | Other services | 2022 |
| DC Electrical Contracts Limited | Construction | 2015 |
| DC Estates & Letting Limited | Real estate | 2013 |
| DC London Ltd | Administrative & support | 2018 |
| DC Maintenance & Construction Limited | Construction | 2017 |
| DCG Care Consultancy Ltd | Professional & scientific | 2024 |
| DCI Transport Ltd | Wholesale & retail | 2026 |
| DCM Hindu Religious Services Ltd | Other services | 2024 |
| DCZ Prints Ltd | Wholesale & retail | 2025 |
| DD Auto Solutions Limited | Other services | 2018 |
| DD Consultancy Limited | Professional & scientific | 2021 |
| DD Driving Services Ltd | Transport & logistics | 2015 |
| DD Maintenance Ltd | Administrative & support | 2018 |
| DD33 Ltd | Real estate | 2022 |
| DDB EL Ltd | Construction | 2024 |
| DDK Properties Limited | Real estate | 2019 |
| DDK Services Ltd | Administrative & support | 2022 |
| DDM Management Limited | Real estate | 2018 |
| DDS Casting Agency Ltd | Professional & scientific | 2025 |
| DDS Development Limited | Construction | 2009 |
| DE Brilliance Ltd | Wholesale & retail | 2020 |
| DE Campi Consultancy Ltd | Other services | 2024 |
| DE Digitizers Ltd | Information & communication | 2022 |
| DE Facto Infotech UK Ltd | Information & communication | 2020 |
| DE Taxi Ltd | Transport & logistics | 2015 |
| DE Vere Care (Home Service) Limited | Health & social care | 2019 |
| DE Vere Estates Ltd | Real estate | 2024 |
| De'Xandra UK Limited | Wholesale & retail | 2024 |
| De-Vize Architecture Ltd | Professional & scientific | 2017 |
| DEA Cleaners Ltd | Administrative & support | 2024 |
| Deal Ecome Star Limited | Wholesale & retail | 2025 |
| Deal Hunt Automotives Ltd | Wholesale & retail | 2024 |
| Dealcartuk Ltd | Wholesale & retail | 2023 |
| Dealers Portal UK Limited | Wholesale & retail | 2026 |
| Deals in Wheels Gloucester Limited | Wholesale & retail | 2020 |
| DEALS4BUSINESS Ltd | Administrative & support | 2014 |
| Dealsbykathy Ltd | Wholesale & retail | 2023 |
| Dealscout Digital Ltd | Wholesale & retail | 2024 |
| Dealvex Ltd | Wholesale & retail | 2025 |
| Dean Coopers LLP | | 2011 |
| Deancoopers Tax Advisors Ltd | Professional & scientific | 2019 |
| Deane and Brothers Ltd | Real estate | 2011 |
| Debaytol Worldwide Limited | Health & social care | 2025 |
| Debden Lift Services Ltd | Manufacturing | 2024 |
| Debell Global Solutions Ltd | Real estate | 2021 |
| Deborah Battsek PR Ltd | Administrative & support | 2007 |
| Deborah Court Residents Association Limited | Households | 1973 |
| Debrachigwell (2023) Ltd | Wholesale & retail | 2023 |
| Debt Doctor Ltd | Administrative & support | 2007 |
| Debts Solution UK Ltd | Administrative & support | 2024 |
| Decaj Homes Limited | Real estate | 2021 |
| Decamerone Trading Limited | Wholesale & retail | 2017 |
| Decbuild Commercial Limited | Real estate | 1992 |
| Deccan Darbar Ltd | Hospitality | 2024 |
| Deccan Flavours Limited | Hospitality | 2025 |
| Deccan Hyderabad Limited | Wholesale & retail | 2023 |
| Deccan Stars Ltd | Information & communication | 2023 |
| Decco London Ltd | Hospitality | 2010 |
| Decent Consultancy Limited | Professional & scientific | 2024 |
| Decent Goodfellow Architects Ltd | Professional & scientific | 2016 |
| Decent Price Removal Ltd | Transport & logistics | 2022 |
| Decimal Accountancy Limited | Professional & scientific | 2017 |
| Declan Colgan Music Ltd | Information & communication | 2003 |
| Deco Craft Ltd | Construction | 2020 |
| Decoart 3D Tiles Ltd | Construction | 2023 |
| Decor Homeware Ltd | Wholesale & retail | 2024 |
| Decor on Decor Ltd | Wholesale & retail | 2021 |
| Decor Services Limited | Construction | 2025 |
| Decoriana Ltd | Wholesale & retail | 2025 |
| Decorum Image and Etiquette Ltd | Other services | 2016 |
| Decot Services Ltd | Information & communication | 2025 |
| Dedaa Construction Ltd | Construction | 2023 |
| Dedea Construction Ltd | Construction | 2023 |
| Dedul Ltd | Construction | 2016 |
| Deedside Limited | Hospitality | 2025 |
| Deemso Commercial Services Ltd | Professional & scientific | 2017 |
| Deen Capital Ltd | Professional & scientific | 2024 |
| Deen Investments Ltd | Real estate | 2023 |
| Deenyaa Limited | Wholesale & retail | 2026 |
| Deep Brickwork Limited | Construction | 2026 |
| Deep Horizon Ltd | Wholesale & retail | 2024 |
| Deep Staircase Ltd | Construction | 2024 |
| Deepa Consultancy Ltd | Information & communication | 2005 |
| Deepdrill Limited | Construction | 2025 |
| Deepearth Glow Ltd | Information & communication | 2024 |