| D.S.M Plant Hire Services Limited | Administrative & support | 2022 |
| D.S.M. Contract Lifting Services Limited | Administrative & support | 2017 |
| D.T.R.Building Services Ltd. | Construction | 2016 |
| D.Williamson Limited | Transport & logistics | 2014 |
| D.Z.H Environmental Services Ltd | Water & waste | 2021 |
| D1 Developments (London) Limited | Construction | 2025 |
| D17 Building Services Ltd | Construction | 2021 |
| D2M Ventures Ltd | Professional & scientific | 2024 |
| D3 Services Group Limited | Wholesale & retail | 2013 |
| DAB Construction Ltd | Construction | 2026 |
| DAB Property Group Ltd | Real estate | 2022 |
| DAC and Refrigeration Ltd | Construction | 2023 |
| DAC Paving & Building Maintenance Ltd | Construction | 2016 |
| Dacos Investments Ltd | Real estate | 2020 |
| Daddy O'S Suya Spot Ltd | Hospitality | 2020 |
| Dadiji Holdings Ltd | Financial services | 2025 |
| DAE Ltd | Manufacturing | 2022 |
| Dafaaesthetics Ltd | Other services | 2025 |
| Dafchu Ltd | Professional & scientific | 2023 |
| Dailie Transport Ltd | Transport & logistics | 2017 |
| Daily Site Managing Services Limited | Construction | 2015 |
| Daisalux Limited | Wholesale & retail | 2015 |
| Daisy Churchill Limited | Extraterritorial | 2013 |
| Daisy Day Property Group Ltd | Households | 2024 |
| Dalacey-Boo Management Ltd. | Arts & recreation | 2014 |
| Dalion Limited | Transport & logistics | 2022 |
| DAM Dryliners Ltd | Construction | 2019 |
| Dam&Tud Construct Ltd | Construction | 2024 |
| Damir Shop Ltd | Wholesale & retail | 2024 |
| Damivtrans Ltd | Transport & logistics | 2025 |
| DAN ADE Consultancy Limited | Real estate | 2024 |
| DAN Chalkley Homes Limited | Professional & scientific | 2015 |
| DAN Phillips Fitness Ltd | Other services | 2018 |
| DAN Professional Ltd | Construction | 2017 |
| Danamic Heating Limited | Construction | 2020 |
| Danci Haulage Ltd | Transport & logistics | 2017 |
| Danger Services Ltd | Professional & scientific | 2024 |
| Danialscare Limited | Health & social care | 2020 |
| Daniel Claudia Construction Limited | Construction | 2022 |
| Daniel Millington Limited | Construction | 2016 |
| Daniel Performance Coaching Ltd | Arts & recreation | 2026 |
| Daniel&Marin Ltd | Transport & logistics | 2025 |
| Daniels Property Group Limited | Real estate | 2024 |
| Daniels Quality & Safety Ltd | Professional & scientific | 2018 |
| Dankee Group Ltd | Administrative & support | 2024 |
| Dankee Ltd | Professional & scientific | 2019 |
| Dann Transport Ltd | Transport & logistics | 2020 |
| Dannik Construction Ltd | Construction | 2016 |
| Danny Mold Limited | Construction | 2023 |
| Danny Wyatt Limited | Construction | 2010 |
| Danoph Limited | Construction | 2014 |
| Danoroti Limited | Real estate | 2025 |
| Dansaar Ltd | Real estate | 2018 |
| Dansk Café Limited | Hospitality | 2021 |
| Danutpopaconstruct Limited | Construction | 2025 |
| Danvic Health & Safety Services Ltd | Administrative & support | 2021 |
| Dara Group Ltd | Wholesale & retail | 2021 |
| Darcstudio Limited | Professional & scientific | 2014 |
| Dare IT Consulting Ltd | Administrative & support | 2016 |
| Darex Consulting Ltd | Professional & scientific | 2017 |
| Darfash Diamond Jewellers Limited | Wholesale & retail | 2014 |
| Daria & Alex Ltd | Administrative & support | 2015 |
| Daric's Global Services Ltd | Administrative & support | 2025 |
| Darics Cleaning Services Limited | Administrative & support | 2025 |
| Darius DRS Ltd | Construction | 2025 |
| Dark Flavours Ltd | Wholesale & retail | 2025 |
| Darkstar Consulting Limited | Information & communication | 2006 |
| Darmont Ltd | Administrative & support | 2020 |
| Darrell Williams Educational Improvements Limited | Education | 2012 |
| Darsan Groundworks Limited | Construction | 2004 |
| Darsey Ltd | Professional & scientific | 2025 |
| Daru Training Academy Limited | Education | 2025 |
| DAS CON Limited | Professional & scientific | 2011 |
| DAS Shop Ltd | Wholesale & retail | 2025 |
| Daser Ltd | Wholesale & retail | 2016 |
| Dasla Consult Ltd | Professional & scientific | 2025 |
| Dasla Limited | Transport & logistics | 2018 |
| DAT Building Solutions Ltd | Construction | 2025 |
| DAT Properties Ltd | Real estate | 2023 |
| Datastore Computing Limited | Information & communication | 1997 |
| Datop Healthcare Services Ltd | Health & social care | 2020 |
| DAV Expres Ltd | Transport & logistics | 2019 |
| Davbry Motors Limited | Wholesale & retail | 2003 |
| Dave 2 B Ltd | Transport & logistics | 2025 |
| Dave Cole Training Limited | Other services | 2012 |
| Davenham Associates Ltd | Information & communication | 2016 |
| Davenoch Ltd | Health & social care | 2025 |
| Daveyy Limited | Wholesale & retail | 2025 |
| David Alacey Management Ltd. | Arts & recreation | 2021 |
| David Apted Limited | Construction | 2011 |
| David Cooper Digital Ltd | Other services | 2021 |
| David Dean Photographic Limited | Professional & scientific | 2023 |
| David Fixing Ltd | Construction | 2016 |
| David Steel Construction Ltd | Construction | 2019 |
| David's Family Ltd | Real estate | 2026 |
| David's Woodturning Ltd | Manufacturing | 2023 |
| Davidson Utsaghan Global Ltd | Information & communication | 2022 |
| Daviglobal Ltd | Financial services | 2025 |
| Davima Ltd | Construction | 2024 |
| Davis Family Holdings Limited | Construction | 2025 |