| Dnml Media & Tech Solutions Ltd | Information & communication | 2016 |
| DNS Benefits Ltd | Administrative & support | 2020 |
| DNS Fire Protection Limited | Other services | 2018 |
| DNS9 Limited | Professional & scientific | 2011 |
| DO Roofing Ltd | Construction | 2016 |
| DO Surveying Ltd | Professional & scientific | 2026 |
| Dobell Property (Hendon) Ltd | Construction | 2023 |
| Doctor Robert Limited | Health & social care | 2011 |
| DOCTOR4LEGAL Ltd | Professional & scientific | 2024 |
| Doctors in Distress Limited | Health & social care | 2019 |
| Docx Limited | Wholesale & retail | 2025 |
| Dodhia Traders Limited | Wholesale & retail | 2001 |
| Dogs Almighty Ltd | Other services | 2023 |
| Dogs CAN Surf Ltd | Administrative & support | 2014 |
| Dohas Design Ltd | Professional & scientific | 2020 |
| Dolfry Limited | Information & communication | 2015 |
| Dolfry Property Limited | Real estate | 2025 |
| Dolphin Court (Woodlands) Limited | Households | 1968 |
| Dolphina Gymnastic Centre Ltd | Arts & recreation | 2013 |
| Domcat LP | | 2017 |
| Domduro Ltd | Hospitality | 2025 |
| Dome Property Investments Ltd | Real estate | 2020 |
| Domestic & Commercial Electrics Ltd | Other services | 2025 |
| Domestic Abuse Alliance Ltd | Information & communication | 2020 |
| Domestic Air Conditioning Limited | Professional & scientific | 2004 |
| Domestic Staffing & Services Ltd | Other services | 2025 |
| Domi's Barber Ltd | Other services | 2025 |
| Dominik Hold LP | | 2017 |
| Doms on the Go Ltd | Hospitality | 2026 |
| Domustoga Limited | Real estate | 2021 |
| Domy Logistic Ltd | Transport & logistics | 2018 |
| Domycv Limited | Other services | 2015 |
| DON REN Ltd | Real estate | 2022 |
| Don'T Travel Empty Limited | Transport & logistics | 2008 |
| Doncaster School Solutions (Holdings) Limited | Professional & scientific | 2006 |
| Doncaster School Solutions Limited | Construction | 2006 |
| Donn&Gail Property Ltd | Construction | 2023 |
| Donna's Cleaning Services Ltd | Administrative & support | 2019 |
| Donut Cafe Limited | Hospitality | 2017 |
| Donya Property Holdings Ltd | Real estate | 2025 |
| Donya Solutions Limited | Real estate | 2006 |
| Doodlecuddles Limited | Wholesale & retail | 2025 |
| Door Avenues Limited | Real estate | 2024 |
| Door Step Easy Limited | Wholesale & retail | 2026 |
| Doormates Ltd | Construction | 2019 |
| Dopam Limited | Wholesale & retail | 2021 |
| DOR Legal Services Ltd | Professional & scientific | 2022 |
| Dorawood Ltd | Real estate | 2023 |
| Dorianar Designs Limited | Professional & scientific | 2024 |
| Dormant Riverside Limited | Other services | 2012 |
| Dorset Mews (Finchley) Management Company Limited | Real estate | 1994 |
| Dorset Mews Freeholders Limited | Real estate | 1997 |
| Dorset Rail & Property Consultants Ltd | Real estate | 2015 |
| Dosa Express Limited | Hospitality | 2019 |
| Dosanjh Holdings Limited | Financial services | 2022 |
| Dosbros Ltd | Information & communication | 2020 |
| Dosev & SON Ltd | Other services | 2018 |
| Doshaheen Solutions UK Limited | Information & communication | 2021 |
| Doshi Limited | Real estate | 2021 |
| Dososito Ltd | Financial services | 2023 |
| Dotcomsourcing Limited | Information & communication | 2024 |
| Dotted Note School of Music Ltd | Arts & recreation | 2020 |
| Double Air Cooling Ltd | Manufacturing | 2008 |
| Double Investments Ltd | Real estate | 2023 |
| Double Noire Limited | Professional & scientific | 2016 |
| Double Trouble K'S Ltd | Transport & logistics | 2020 |
| Dovercourt House Ltd | Real estate | 2021 |
| Doves Support Services Limited | Households | 2023 |
| Downas Limited | Professional & scientific | 2008 |
| Downesbury (Management) Limited | Real estate | 2002 |
| Downinthestreet Limited | Arts & recreation | 2020 |
| Downside and Lancaster Management Limited | Real estate | 2006 |
| DP and LJ Properties Ltd | Construction | 2018 |
| DP Property Holdings Limited | Real estate | 2017 |
| DPA Support Services Limited | Professional & scientific | 1996 |
| Dpass Holdings Limited | Professional & scientific | 2004 |
| Dpbeautyacademy Ltd | Other services | 2022 |
| DPC Construction Services Limited | Professional & scientific | 2016 |
| DPG Advisory Ltd | Professional & scientific | 2024 |
| DPH Mechanical Ltd | Construction | 2016 |
| DPJ Assets Ltd | Real estate | 2021 |
| Dpjv Holdings Limited | Real estate | 2025 |
| DPR Housing Limited | Real estate | 2019 |
| Dprefect Limited | Wholesale & retail | 2025 |
| DPS Consulting Limited | Professional & scientific | 2007 |
| DPS Realisations Limited | Wholesale & retail | 1983 |
| DR Amin Limited | Health & social care | 2023 |
| DR AWO Limited | Real estate | 2020 |
| DR Bali Dermatology Limited | Health & social care | 2026 |
| DR Commercial Developments Ltd | Real estate | 2026 |
| DR Fatima London Ltd | Health & social care | 2024 |
| DR Hamakarim Ltd | Health & social care | 2021 |
| DR Hooo Ltd | Administrative & support | 2024 |
| DR Mangla Limited | Health & social care | 2016 |
| DR R-Meen Limited | Health & social care | 2023 |
| DR Rowett Neuropsychiatry Expert Witness Ltd | Health & social care | 2025 |
| DR S London Limited | Wholesale & retail | 2026 |
| DR Tparanjape Ltd | Health & social care | 2023 |
| DR. Deutsch Ltd | Wholesale & retail | 2025 |
| DR. IT NK Ltd | Information & communication | 2014 |