| DA Construction Line Limited | Construction | 2016 |
| DA Monarchy Ltd | Information & communication | 2025 |
| Daao Ltd | Real estate | 2024 |
| Dacus Solutions Ltd | Transport & logistics | 2020 |
| Dacy Building Services Ltd | Construction | 2012 |
| Dacy Property Development Ltd | Real estate | 2014 |
| Dagroza Care Ltd | Health & social care | 2025 |
| Daimoraxia Ltd | Hospitality | 2024 |
| Daisy & BRO Lettings Ltd | Real estate | 2025 |
| Daleydrafting Ltd | Construction | 2026 |
| Dalott Trans Ltd | Transport & logistics | 2018 |
| Dalugun Global Holdings Limited | Transport & logistics | 2025 |
| Daly & Bradley Spirits Ltd | Wholesale & retail | 2022 |
| Damascusarts Ltd | Wholesale & retail | 2025 |
| Damd Medical Limited | Health & social care | 2023 |
| Damties Services Ltd | Transport & logistics | 2024 |
| DAN Bailey Limited | Professional & scientific | 2007 |
| Dance Teacher Training Academy Ltd | Education | 2026 |
| Dandu Ltd | Information & communication | 2015 |
| Danelena Security Ltd | Administrative & support | 2021 |
| Dani Style 22 Ltd | Wholesale & retail | 2022 |
| Dani Talmac Ltd | Construction | 2024 |
| Daniel David Projects Ltd | Construction | 2022 |
| Daniel Express Kent Ltd | Transport & logistics | 2020 |
| Daniel Service and Repair Ltd | Wholesale & retail | 2020 |
| Daniel Singh Digital Ltd | Professional & scientific | 2025 |
| Danimak Limited | Construction | 2005 |
| Dannity Limited | Administrative & support | 2019 |
| Danny and Parker Ltd | Administrative & support | 2014 |
| Dantech Business Solutions Limited | Information & communication | 2013 |
| Danuttarau Limited | Transport & logistics | 2017 |
| Dapo&Dolapo Limited | Health & social care | 2018 |
| DAR Holdings Limited | Real estate | 2020 |
| Darby Capital Limited | Administrative & support | 2017 |
| Darby Groundworks Limited | Construction | 1998 |
| Darby Holdings Limited | Professional & scientific | 2006 |
| Darby London Limited | Other services | 2018 |
| Darby Property Limited | Real estate | 2014 |
| Darconna Limited | Real estate | 2019 |
| Dardania Construction Ltd | Construction | 2012 |
| Darkling Designs 10 Limited | Manufacturing | 2017 |
| Darlin' Buds Ltd | Other services | 2009 |
| Darniftam Care Limited | Health & social care | 2014 |
| Darnik Ltd | Construction | 2020 |
| Dartemab Ltd | Information & communication | 2013 |
| Dartrac Ltd | Transport & logistics | 2024 |
| DAS Chicken Limited | Hospitality | 2026 |
| DAS Stores Limited | Wholesale & retail | 2022 |
| DAT Properties Specialist Ltd | Real estate | 2023 |
| DAT Services Ltd | Wholesale & retail | 2017 |
| Data Simples Ltd | Information & communication | 2025 |
| Datacloud IT Ltd | Information & communication | 2023 |
| Datacross Service Limited | Transport & logistics | 2023 |
| Datapro Services Ltd | Information & communication | 1997 |
| Davenport Investment Properties Ltd | Real estate | 2025 |
| David Bareham Limited | Professional & scientific | 2009 |
| David Crane Ltd | Construction | 2019 |
| Davieslina Logistics Ltd | Transport & logistics | 2025 |
| Davreu Consulting Limited | Professional & scientific | 2013 |
| Davs Construction Services Limited | Construction | 2020 |
| Dawn Motors Ltd | Wholesale & retail | 2016 |
| DAX Fintech Consulting Ltd | Information & communication | 2022 |
| Daylaw Consulting Ltd | Professional & scientific | 2014 |
| DB Elite Mortgage Solutions Ltd | Financial services | 2025 |
| DB Transport Limited | Transport & logistics | 2026 |
| Dbanks Consults Ltd | Professional & scientific | 2010 |
| DBB Catering Services Limited Ltd | Hospitality | 2020 |
| DBS Commercials Ltd | Wholesale & retail | 2006 |
| DC Innovations Ltd | Construction | 2022 |
| Dc-Services Ltd | Information & communication | 2014 |
| DCC Group Ltd | Manufacturing | 2010 |
| DCC Property Maintenance Ltd | Construction | 2023 |
| DD Decor Ltd | Administrative & support | 2026 |
| DDA Bespoke Builders Ltd | Construction | 2025 |
| DDI Solutions Ltd | Construction | 2017 |
| DDR Business Services Limited | Professional & scientific | 2025 |
| DDT Utilities Ltd | Construction | 2023 |
| DE Pasquale Investimenti Ltd | Financial services | 2014 |
| De-Phoenix Limited | Information & communication | 2021 |
| De-Solidrock Inc Ltd | Administrative & support | 2020 |
| Dead Ronin INK Limited | Professional & scientific | 2026 |
| Deals OK Limited | Wholesale & retail | 2023 |
| Dean Parrett Academy Limited | Education | 2018 |
| Debbie's Delights Ltd | Health & social care | 2024 |
| Debodies Limited | Other services | 2022 |
| Debrajosh UK Ltd | Health & social care | 2020 |
| Debutante Consulting Ltd | Professional & scientific | 2021 |
| Deccellenza Enterprises Ltd | Manufacturing | 2026 |
| Deckinguk Ltd | Construction | 2021 |
| DEE General Limited | Professional & scientific | 2018 |
| Deea & Darius Ltd | Wholesale & retail | 2016 |
| Deep Wake Limited | Professional & scientific | 2026 |
| Deepsea Group Ltd | Administrative & support | 2020 |
| Deepsea Property's Ltd | Financial services | 2020 |
| Deeptech Valley Ltd | Information & communication | 2025 |
| Deko Group Limited | Wholesale & retail | 2019 |
| Dektrans Ltd | Transport & logistics | 2020 |
| Dela Empire Ltd | Real estate | 2023 |
| Dela's Allure Limited | Manufacturing | 2021 |
| Delex Solutions Ltd | Information & communication | 2020 |