| Disauthority Ltd | Information & communication | 2023 |
| Disauthority Originals Ltd | Information & communication | 2024 |
| Discount Displays Limited | Manufacturing | 2000 |
| Dissco IT Services Limited | Information & communication | 2015 |
| District 6 Productions Limited | Manufacturing | 1994 |
| Ditton Walk Property Management Company Ltd | Hospitality | 2014 |
| Dittoncroft Close LLP | | 2017 |
| Dittoncroft Ltd | Real estate | 2017 |
| Diva Enterprises Global Ltd | Health & social care | 2009 |
| Diva Hair & Cosmetics Ltd | Other services | 2015 |
| Diverge Records Limited | Information & communication | 2015 |
| Diverse Construction Services Ltd | Construction | 2023 |
| Divine Acquisitions Ltd | Real estate | 2020 |
| Divine Grace Genius Limited | Health & social care | 2025 |
| Divine Pathway Limited | Professional & scientific | 2022 |
| Divine Super Cleaning and Support Services Limited | Administrative & support | 2014 |
| Divinus Gratia Mega BIZ Ltd | Administrative & support | 2022 |
| Dixon Glass Limited | Manufacturing | 2002 |
| Diya Sallu Limited | Construction | 2020 |
| DJ Kane Mechanical Management Ltd | Construction | 2012 |
| DJ Renewable Services CIC | Construction | 2022 |
| Dj's Kitchen Ltd | Hospitality | 2018 |
| DJ9M Health Care Limited | Health & social care | 2014 |
| DJB OG Solutions Limited | Information & communication | 2024 |
| DJC Boutique Limited | Extraterritorial | 2022 |
| Djcl Investments Ltd | Real estate | 2021 |
| Djcl Properties Ltd | Real estate | 2022 |
| DJG Singhaley Ltd | Real estate | 2021 |
| DJM Hair and Beauty Salon Ltd | Other services | 2022 |
| DJR Ltd | Professional & scientific | 2025 |
| DK Creative Studio Ltd | Wholesale & retail | 2022 |
| DK Estates London Limited | Real estate | 2021 |
| DKD Business&Co Ltd | Wholesale & retail | 2024 |
| DKK9 Ltd | Wholesale & retail | 2021 |
| Dkobs Care Limited | Health & social care | 2014 |
| DKR Accessories Ltd | Wholesale & retail | 2025 |
| Dkstudios Ltd. | Information & communication | 2018 |
| DL Fullerton Limited | Real estate | 2019 |
| Dlgnt Industries Ltd | Information & communication | 2021 |
| DLM Removals Limited | Transport & logistics | 2013 |
| DM Artistry Ltd | Professional & scientific | 2024 |
| DM Functionals Ltd | Public administration | 2022 |
| DM Harley Property Limited | Real estate | 2022 |
| DM Infinity Limited | Hospitality | 2023 |
| DM Prox Ltd | Arts & recreation | 2024 |
| DM Smith DRY Lining Limited | Construction | 2014 |
| DM Transport Ltd | Transport & logistics | 2006 |
| Dmah Deli Limited | Hospitality | 2023 |
| Dmda Ltd | Construction | 2016 |
| DMG Painting and Decorating Ltd | Construction | 2022 |
| Dmondom Limited | Real estate | 2025 |
| DMP Contractors Ltd | Wholesale & retail | 2016 |
| DMR Vehicle Care Ltd | Wholesale & retail | 2026 |
| DMT Training & HR Ltd. | Professional & scientific | 2011 |
| DMV Man&Van Ltd | Water & waste | 2023 |
| DNA Eco Limited | Administrative & support | 2010 |
| DNA Elite Sports Events Ltd | Arts & recreation | 2022 |
| DNA Infra Limited | Information & communication | 2016 |
| DNA Infra Properties Ltd | Real estate | 2021 |
| DNJ Motors Ltd | Wholesale & retail | 2020 |
| DNM Estates LLP | | 2026 |
| Dnumvi Couriers Ltd | Transport & logistics | 2019 |
| DNV Construction Ltd | Construction | 2018 |
| DO IT Generation Limited | Real estate | 2015 |
| Dobeman Limited | Information & communication | 2025 |
| Doberthein Ltd | Information & communication | 2019 |
| Dobsons Building Services Ltd | Construction | 2023 |
| Dock Limited | Wholesale & retail | 2018 |
| Dockhaven Limited | Households | 1988 |
| Dockland International Limited | Real estate | 1997 |
| Docklands Security Systems Limited | Administrative & support | 2010 |
| Doctor Simba Unisex Salon UK Ltd | Other services | 2020 |
| Docusort-Pro Limited | Information & communication | 2026 |
| Doddle Consulting Ltd | Professional & scientific | 2024 |
| Dodhia Investments Co Ltd | Financial services | 2017 |
| Dodotech Ltd | Information & communication | 2024 |
| DOE Brow Management (Clifton) Limited | Households | 1977 |
| Dog London Ltd | Administrative & support | 2025 |
| Doggart & Squash Limited | Hospitality | 2015 |
| Dogorman Ltd | Hospitality | 2026 |
| Doherty & Co. Accountancy Ltd | Professional & scientific | 2016 |
| DOK Ltd | Arts & recreation | 2021 |
| DOK Tanks Limited | Manufacturing | 2016 |
| Doku Construction Ltd | Construction | 2018 |
| DOL Home Improvements Ltd | Wholesale & retail | 2024 |
| Dola Buildings Group Ltd | Construction | 2015 |
| Dolcia Ltd | Administrative & support | 2024 |
| Dolemand Property Ltd | Real estate | 2024 |
| Dollar Chicken Express Ltd | Hospitality | 2017 |
| Dolman Court Management Company Limited | Households | 2004 |
| Dolomite Services Ltd. | Construction | 2017 |
| Dolphin Swim Academy Limited | Education | 2020 |
| Dolphin Swim School Ltd | Arts & recreation | 2000 |
| Dolphin's FIN Ltd | Hospitality | 2024 |
| Dolphinage Ltd | Wholesale & retail | 2025 |
| DOM Accounting Limited | Professional & scientific | 2015 |
| Domadi Ltd | Wholesale & retail | 2021 |
| Domestic & Commercial Electrical Installations Limited | | 1985 |
| Dominion Mandate Ltd | Education | 2024 |
| Dommind Ltd | Real estate | 2019 |