| D-Nmart Limited | Wholesale & retail | 2021 |
| D-Shique Boutique Ltd | Other services | 2018 |
| D-Stone Jewel UK Ltd | Wholesale & retail | 2024 |
| D. DAN Ltd | Construction | 2014 |
| D. H. Cullen Limited | Administrative & support | 2012 |
| D. Porter (Property Maintenance) Limited | | 1983 |
| D.A.T. Assembly's Limited | | 1987 |
| D.A.V. Build Ltd | Construction | 2016 |
| D.D.J's Productions Limited | Other services | 2002 |
| D.F.G Training Ltd | Education | 2020 |
| D.I.B Consulting Limited | Administrative & support | 2015 |
| D.N.Sharpe Limited | Wholesale & retail | 1961 |
| D.O Stays Ltd | Real estate | 2025 |
| D.S. Design London Ltd | Real estate | 2021 |
| D.T. Lofts Ltd | Construction | 2018 |
| D1 Housing Limited | Real estate | 2018 |
| D2R Cross Media Ltd | Extraterritorial | 2011 |
| D2YP Ltd | Wholesale & retail | 2025 |
| D3LUX Ltd | Construction | 2022 |
| D3LUXE Digital Ltd | Information & communication | 2022 |
| D3LUXE Ltd | Information & communication | 2026 |
| D81 Solutions Limited | Information & communication | 2008 |
| DA (UK) Incorporated Limited | Professional & scientific | 2014 |
| DA Enterprises Ltd | Administrative & support | 2022 |
| DA Global (UK) Ltd | Wholesale & retail | 2017 |
| DA Silva Associates Limited | Professional & scientific | 2021 |
| DA Studio Flats Ltd | Real estate | 2023 |
| DA Studio Ltd. | Extraterritorial | 2024 |
| DA Vision Build Ltd | Construction | 2019 |
| Daarasp LLP | | 2004 |
| Dabara Technologies Ltd | Information & communication | 2026 |
| Dabasia Constructors Limited | Construction | 2006 |
| Dabasia Consulting Group Limited | Information & communication | 2017 |
| Dabasia Consulting Ltd | Professional & scientific | 2020 |
| Dabasia Holdings Ltd | Real estate | 2018 |
| Dabasia Investments Ltd | Real estate | 2019 |
| Dabhi Optics Ltd | Health & social care | 2023 |
| Dabi Property Management Limited | Real estate | 2015 |
| Dabra Haulage Ltd | Transport & logistics | 2025 |
| DAC Haulage Limited | Administrative & support | 2021 |
| Dackos Construction Ltd | Construction | 2014 |
| Dacu Ltd | Construction | 2026 |
| Dada & Sons Limited | Wholesale & retail | 2022 |
| Daddyldn Ltd | Wholesale & retail | 2025 |
| Dadgarian Buy to LET Ltd. | Real estate | 2018 |
| Dados Construction Ltd | Construction | 2008 |
| Dadrian Driving Limited | Transport & logistics | 2014 |
| Daedalus Design London Limited | Professional & scientific | 2018 |
| Dagmar Developments Limited | Financial services | 2003 |
| Dags Partners Limited | Financial services | 2013 |
| Dahab Estates Ltd | Real estate | 2025 |
| Dahlia Group Limited | Real estate | 2026 |
| Dailulu Ltd | Information & communication | 2026 |
| Daily Click Ltd | Wholesale & retail | 2025 |
| Daily Deal Business Ltd | Wholesale & retail | 2022 |
| Daily Food Direct Ltd | Wholesale & retail | 2020 |
| Daily Table Harrow Ltd | Hospitality | 2025 |
| Dailycars M&S Ltd | Administrative & support | 2025 |
| Dailyuseful First UK Limited | Wholesale & retail | 2019 |
| Daiming Limited | Real estate | 2014 |
| Dainjana Ltd | Construction | 2025 |
| Daintry Lodge Management Company Limited | Households | 1983 |
| Daira Ltd | Professional & scientific | 2017 |
| Daisy Consulting Ltd | Professional & scientific | 2021 |
| Daisy Enterprise Ltd | Real estate | 2021 |
| Daivik Limited | Real estate | 2016 |
| Daivik Properties Limited | Real estate | 2020 |
| Daivum Group Limited | Administrative & support | 2008 |
| Daivum Holdings Limited | Other services | 2019 |
| Dakhs Consultants Ltd | Professional & scientific | 2013 |
| Dakic Development Ltd | Construction | 2011 |
| Daksh Construction Ltd. | Construction | 2015 |
| Daksh Consultancy Ltd | Administrative & support | 2014 |
| Dalavai Consultancy Services Limited | Information & communication | 2025 |
| Dalda Pakkiri Limited | Wholesale & retail | 2019 |
| Dalepark Limited | Real estate | 2013 |
| Dalfin Designs Limited | Manufacturing | 2009 |
| Dali & Co Accountants Ltd | Professional & scientific | 2022 |
| Dalinkasaju Ltd | Wholesale & retail | 2020 |
| Dallu Ltd | Real estate | 2025 |
| Dalph Limited | Real estate | 2022 |
| Dalsin Limited | Information & communication | 2022 |
| Dalton Care Properties Limited | Real estate | 2022 |
| Dalton Care Services Limited | Health & social care | 2017 |
| Dalton Flat Management Limited | Professional & scientific | 1991 |
| Dalton Healthcare Limited | Financial services | 2024 |
| Damas Automotive Limited | Wholesale & retail | 2025 |
| Damas Gardening Limited | Administrative & support | 2005 |
| Dame Petite Ltd | Information & communication | 2017 |
| Damirgroup Ltd | Construction | 2024 |
| Damjis Limited | Professional & scientific | 2022 |
| Damsk Limited | Information & communication | 2002 |
| DAN Aron Chauffeurs Ltd | Transport & logistics | 2005 |
| DAN Builder Ltd | Construction | 2020 |
| DAN G Building Ltd | Construction | 2025 |
| DAN J C Ltd | Health & social care | 2018 |
| DAN Jewellers Limited | Manufacturing | 1989 |
| Danaa Ltd | Information & communication | 2021 |
| Danap Ltd | Construction | 2026 |
| Danbt Holdings Ltd | Real estate | 2016 |