| Daroin Limited | Construction | 2025 |
| Darryl Sartain Limited | Financial services | 2017 |
| Dars NW3 Ltd | Hospitality | 2026 |
| Darvashkay Ltd | Wholesale & retail | 2026 |
| Dash Wardrobes Ltd | Wholesale & retail | 2021 |
| Dashwood House Residents Association Limited | Real estate | 1996 |
| Dasilva Travel Consultancy Limited | Professional & scientific | 2023 |
| DAT Electrical Ltd | Construction | 2007 |
| Datapeace Ltd | Information & communication | 2019 |
| Dataslice Ltd | Information & communication | 2018 |
| Datchworth Court Limited | Real estate | 1989 |
| Dattasoft Limited | Information & communication | 2014 |
| Dave Burn Ltd | Information & communication | 2005 |
| David Carr Management Services Limited | Professional & scientific | 2015 |
| David Hobdell Building Limited | Construction | 1974 |
| David James Williams Ltd | Professional & scientific | 2026 |
| David John Freeth Ltd | Extraterritorial | 2023 |
| David Parfitt Limited | Administrative & support | 2008 |
| David Wright Interior Design Consultants Ltd. | Administrative & support | 2017 |
| Davidsons Investments Ltd | Real estate | 2022 |
| Davies & King Limited | Construction | 2020 |
| Davmar Co Estates Ltd | Real estate | 2017 |
| Dawn H Construction Ltd | Real estate | 2019 |
| Dawn Heritage Ltd | Real estate | 2014 |
| Day Investments Limited | Real estate | 2007 |
| Dayi Investments Limited | Real estate | 2025 |
| Dayi Plumbing Services Ltd | Construction | 2020 |
| Dayi's Pizza Limited | Hospitality | 2017 |
| Dayline Limited | Wholesale & retail | 2002 |
| DB Interiors London Limited | Construction | 2016 |
| DB Parts Ltd | Wholesale & retail | 2019 |
| Dbar & Coffee Ltd | Hospitality | 2025 |
| DBELL96 Limited | Professional & scientific | 2021 |
| DBG Consultancy Ltd | Professional & scientific | 2016 |
| DBP Support Limited | Administrative & support | 2023 |
| Dbsm Consulting Limited | Information & communication | 2017 |
| DC Dairies Ltd | Wholesale & retail | 2024 |
| DC DRY Fish Ltd | Wholesale & retail | 2024 |
| DC Legal Education Ltd | Education | 2022 |
| DC Legal Services Limited | Professional & scientific | 2011 |
| DC Legal Wealth Management Ltd | Real estate | 2021 |
| DC Management Services Limited | Real estate | 1986 |
| DC10 Logistics Ltd | Transport & logistics | 2024 |
| DCF Building Consultancy Limited | Professional & scientific | 2025 |
| DCL Sets Ltd | Information & communication | 2023 |
| DCL Traffic Management Ltd | Construction | 2020 |
| DCV Trading Ltd | Wholesale & retail | 2025 |
| DD Autos Ltd | Wholesale & retail | 2019 |
| DD Construction Group Ltd | Construction | 2021 |
| Ddba Property Ltd | Real estate | 2025 |
| DDD Studio Ltd | Professional & scientific | 2025 |
| Ddsy Building Ltd | Construction | 2021 |
| DE Bruyne Limited | Professional & scientific | 2011 |
| DE Building Limited | Construction | 2018 |
| DE Facto Engineering Limited | Construction | 2005 |
| DE Kara Properties Ltd | Real estate | 2022 |
| DE Mama's African and Intercontinental Restaurant Ltd | Hospitality | 2020 |
| DE Willis Limited | Construction | 2013 |
| De&Ha Construction Ltd | Construction | 2023 |
| Deaf Frog Consultants Ltd | Professional & scientific | 2018 |
| Deals and Reviews Limited | Information & communication | 2017 |
| Deals to Go Limited | Wholesale & retail | 2012 |
| Deans Building & Maintenance Limited | Construction | 2015 |
| Deblo Capital Limited | Financial services | 2020 |
| Deborah Investments Ltd | Real estate | 2020 |
| Deborah Lindley Limited | Health & social care | 2017 |
| Deca-Fold Consulting Limited | Professional & scientific | 2025 |
| Decency Care Limited | Health & social care | 2025 |
| Decent Property Management Ltd | Real estate | 2023 |
| Decker's Legal Services Ltd | Professional & scientific | 2019 |
| Decoflex Limited | Construction | 2021 |
| Decorating Dynamics Ltd | Construction | 2025 |
| Decorating for Renters Limited | Construction | 2010 |
| Decores Ltd. | Manufacturing | 2016 |
| Deda Electrical Services Ltd | Construction | 2022 |
| Dede & Co Limited | Professional & scientific | 2014 |
| Dedicate Sports Ltd | Education | 2022 |
| DEDONS09 Care UK Limited | Health & social care | 2017 |
| DEE Kara Properties Ltd | Real estate | 2019 |
| DEE Sleek Ltd | Other services | 2023 |
| Deelectric Limited | Construction | 2025 |
| Deely Sport Science UK Ltd | Education | 2021 |
| Deenside Management Limited | Real estate | 2003 |
| Deep Blue Technology Services Ltd | Information & communication | 2017 |
| Deeper Contracting Ltd | Construction | 2025 |
| Dee’S Maintenance Ltd | Construction | 2026 |
| Defne Consultancy Ltd | Professional & scientific | 2017 |
| Defne Elisa Limited | Hospitality | 2026 |
| Defne Selen Ltd | Transport & logistics | 2026 |
| Deima Direct Ltd | Wholesale & retail | 2025 |
| Dekk Limited | Professional & scientific | 2017 |
| Deks Convenience Store Limited | Wholesale & retail | 2020 |
| Deku Estate Ltd | Real estate | 2024 |
| Deku Ventures Ltd | Information & communication | 2023 |
| DEL Collado Ltd | Wholesale & retail | 2015 |
| Delbrueckii Ltd | Wholesale & retail | 2024 |
| Delecta Limited | Wholesale & retail | 2010 |
| Delene Ltd | Wholesale & retail | 2023 |
| Delicasil Limited | Wholesale & retail | 2014 |
| Delicii DE LUX Ltd | Manufacturing | 2025 |