| Dark and Dissolved Ltd | Wholesale & retail | 2024 |
| Dark Horse Concepts Ltd | Professional & scientific | 2025 |
| Darwin Builders Ltd | Construction | 2026 |
| Daryan Grill Ltd | Hospitality | 2023 |
| Daryanani Properties Ltd | Real estate | 2018 |
| Data Link Five Ltd | Information & communication | 2023 |
| Data Link Four Ltd | Information & communication | 2023 |
| Data Link Operations Four Ltd | Information & communication | 2024 |
| Data Link Operations Nine Ltd | Information & communication | 2025 |
| Data Link Operations One Ltd | Information & communication | 2024 |
| Data Link Operations SIX Ltd | Information & communication | 2024 |
| Data Link Operations TEN Ltd | Information & communication | 2025 |
| Data Link Operations Two Ltd | Information & communication | 2024 |
| Datacore Computing Ltd | Information & communication | 1998 |
| David Court Limited | Households | 2004 |
| David Horner Investments Limited | Real estate | 1981 |
| David James Motor Company Limited | Wholesale & retail | 2008 |
| David John Palmer Ltd | Manufacturing | 2019 |
| David Smith Financial Services (2004) Limited | Extraterritorial | 2004 |
| Dayswork Ltd | Administrative & support | 2023 |
| DBM Express Crate Hire Ltd | Transport & logistics | 2017 |
| DBM Express Ltd | Transport & logistics | 2013 |
| DC Drainage Plumbing Ltd | Construction | 2024 |
| DCG Engineering Services Limited | Construction | 2021 |
| DCM Installations Ltd | Construction | 2011 |
| DDC Ltd | Professional & scientific | 2009 |
| Ddkm Properties Limited | Construction | 1988 |
| Dean Webb Creative Ltd | Professional & scientific | 2019 |
| Deanrest Limited | Wholesale & retail | 2025 |
| Decorella Limited | Construction | 2017 |
| Deedigitalmarketing Ltd | Professional & scientific | 2025 |
| Deelu's Vehicle Body Repairs Limited | Wholesale & retail | 2022 |
| Deenedify Limited | Professional & scientific | 2024 |
| Deep Sea Fish & Chips Ltd | Hospitality | 2026 |
| DEF Wealth Solutions Limited | Financial services | 2012 |
| Degaspare Web Services Limited | Information & communication | 2014 |
| Dele Adedeji Associates Ltd | Health & social care | 2006 |
| Deliprime Ltd | Wholesale & retail | 2025 |
| Delizon Arbitrage Limited | Wholesale & retail | 2025 |
| Delta Homes (Group) Limited | Real estate | 2025 |
| Demirkiran Ltd | Wholesale & retail | 2016 |
| Dems Builders Ltd | Construction | 2025 |
| Dennehy Group Limited | Real estate | 2024 |
| Deno Ltd | Hospitality | 2025 |
| Dens Investments Limited | Real estate | 2023 |
| Deogele Limited | Information & communication | 2025 |
| Deran Properties Limited | Real estate | 2022 |
| Derman 24 Limited | Hospitality | 2024 |
| Dermot Flanagan Limited | Construction | 2007 |
| DES Iles Studio Ltd | Professional & scientific | 2025 |
| Design Paint Limited | Construction | 2021 |
| DESTINY62 Limited | Hospitality | 2023 |
| Devran Hot Food Limited | Hospitality | 2018 |
| Dewdrop Florist Ltd | Wholesale & retail | 2024 |
| DFB Electrical & Building Services Limited | Construction | 2019 |
| DFL Property Services Ltd | Households | 2025 |
| DG 12 Services Ltd | Information & communication | 2024 |
| DG 13 Services Ltd | Administrative & support | 2022 |
| DG 7 Services Ltd | Administrative & support | 2021 |
| DG 8 Services Ltd | Administrative & support | 2021 |
| DG Management Services Ltd | Administrative & support | 2021 |
| DG Operations Five Ltd | Information & communication | 2024 |
| DG Operations Three Ltd | Information & communication | 2024 |
| DG Services Four Ltd | Information & communication | 2023 |
| DG Services One Ltd | Information & communication | 2022 |
| DG Solutions Three Ltd | Information & communication | 2022 |
| DG Technology One Ltd | Information & communication | 2022 |
| DGK Engineering Ltd | Construction | 2025 |
| DHE Building Services Limited | Construction | 2024 |
| Digital Home Solutions Ltd | Information & communication | 2019 |
| Dignity Rose Therapeutic Pathway Ltd | Education | 2026 |
| Digswell House Management Limited | Real estate | 1988 |
| Dilly Canteen Ltd | Hospitality | 2023 |
| Dilly Grill Ltd | Hospitality | 2025 |
| Dilly Vending Service Ltd | Hospitality | 2025 |
| Dinner Bell Ltd | Hospitality | 2024 |
| Dinos Famous Events Limited | Hospitality | 2024 |
| Direct Heating London Ltd | Construction | 2023 |
| Disco Donuts Limited | Hospitality | 2025 |
| Dismansys Limited | Professional & scientific | 2017 |
| Distribution Global Ltd | Wholesale & retail | 2026 |
| Diva Angels Limited | Other services | 2014 |
| Divan Group Limited | Real estate | 2020 |
| Divine ZEN Ltd | Other services | 2025 |
| Divtec Limited | Professional & scientific | 2018 |
| Diwan Capital Ltd | Real estate | 2025 |
| Diwan Legal Limited | Other services | 2026 |
| Diya Aromas Limited | Wholesale & retail | 2025 |
| DJ Solutions Consultancy Limited | Health & social care | 2016 |
| DJB Property Services Ltd. | Construction | 2016 |
| DJB Telecoms Ltd | Professional & scientific | 2020 |
| DJP Surveyors Limited | Professional & scientific | 2023 |
| DJW Hospitality Ltd | Hospitality | 2018 |
| Dk&Ik Holdings Ltd | Wholesale & retail | 2024 |
| DLC Accountancy Ltd | Professional & scientific | 2015 |
| DLD Global TR 1 Ltd | Administrative & support | 2021 |
| DLD Technology One Ltd | Information & communication | 2022 |
| DLD Technology Two Ltd | Information & communication | 2022 |
| DLD TR4 Ltd | Administrative & support | 2021 |
| DM London Services Ltd | Wholesale & retail | 2018 |