| DB Planning and Property Services Limited | Administrative & support | 2016 |
| DB65 Limited | Professional & scientific | 2025 |
| Dbaz Ltd | Information & communication | 2018 |
| DBD Beatrice Ltd | Financial services | 2023 |
| Dbksa Consulting Ltd | Professional & scientific | 2021 |
| Dboy Security Limited Limited | Administrative & support | 2025 |
| DBR Engineering Services Ltd | Professional & scientific | 2007 |
| DBX Limited | Education | 2025 |
| DC & Co Property Services Ltd | Construction | 2008 |
| DC Master Fencing Ltd | Construction | 2020 |
| DCB Consulting Limited | Information & communication | 2024 |
| DCL Plumbing and GAS Limited | Construction | 2017 |
| DCN Saab Limited | Administrative & support | 2004 |
| DCS Property Group Limited | Construction | 2025 |
| Dd&Sunrise Coast Ltd | Real estate | 2025 |
| Dd's Childcare Ltd | Education | 2024 |
| DDH Talent & Coaching Group Ltd | Administrative & support | 2017 |
| DDS Contracts Ltd | Construction | 2026 |
| DE Hong Ltd | Education | 2019 |
| DE Montfort Lodge Limited | Real estate | 1981 |
| DE Sousa Nexus UK Limited | Professional & scientific | 2024 |
| DE VOS Consultancy Limited | Professional & scientific | 2007 |
| Deaf Buildings Contractors Ltd | Construction | 2020 |
| Deaf Property Holdings Limited | Real estate | 2024 |
| Deaf Prosperity Limited | Administrative & support | 2019 |
| Deafland UK Ltd | Health & social care | 2023 |
| Dealogy Ltd | Administrative & support | 2024 |
| Dealpro Ltd | Professional & scientific | 2018 |
| Debbie's Accounts Consultancy Ltd | Professional & scientific | 2016 |
| Debbiebartlett Limited | Administrative & support | 2008 |
| Deborah Collier Holdings Ltd | Financial services | 2022 |
| Debra Power Limited | Administrative & support | 2011 |
| Deckmist Limited | Households | 1997 |
| Deco (Long Lane) Limited | Construction | 2011 |
| Deco Design and Build Co. Limited | Construction | 1999 |
| Deco Investments Limited | Real estate | 2008 |
| Decorators DEN (Swanley) Ltd | Construction | 2022 |
| Decorators DEN Contractors Ltd. | Extraterritorial | 2018 |
| Decorby Ltd | Wholesale & retail | 2025 |
| Decordon Limited | Households | 1983 |
| Decoreno Ltd | Construction | 2024 |
| DEE Tasty Limited | Hospitality | 2022 |
| Deedlify Limited | Transport & logistics | 2025 |
| Deen Party Hires Ltd | Administrative & support | 2024 |
| Deep Blue London Ltd | Extraterritorial | 2025 |
| Deep Support Limited | Real estate | 2024 |
| Deep-C Vision Limited | Information & communication | 2017 |
| DEEP6 UK Ltd | Manufacturing | 2018 |
| Deepalert Limited | Information & communication | 2019 |
| Deepdale Residents Association Limited | Households | 1979 |
| Deepdene (Shortlands) Limited | Households | 1965 |
| Deepdene House Management Limited | Households | 1995 |
| Deeside Projects Limited | Real estate | 1992 |
| Degchi Ltd | Wholesale & retail | 2022 |
| Delamaine Limited | Professional & scientific | 2014 |
| Delaney Bell Hutchings Limited | Construction | 2006 |
| Delaney Mansions (London) RTM Company Limited | Real estate | 2026 |
| Delanin Cleaning Ltd | Administrative & support | 2025 |
| Delano Wheatley Consulting Limited | Professional & scientific | 2021 |
| Delano's Night Club Limited | Hospitality | 2006 |
| Delden Limited | Transport & logistics | 2022 |
| Deliberation Limited | Information & communication | 2009 |
| Delicatess Limited | Wholesale & retail | 2009 |
| Delta Brooke Limited | Construction | 2021 |
| Delucan Limited | Real estate | 2021 |
| Demaer Ltd | Wholesale & retail | 2023 |
| Demiri Builder Ltd | Construction | 2019 |
| Demm Limited | Information & communication | 2011 |
| Demolition Games Limited | Extraterritorial | 2007 |
| DEMON2 Ltd | Professional & scientific | 2015 |
| Demorgan Medical Limited | Health & social care | 2016 |
| Demsal Grill Limited | Hospitality | 2024 |
| Demureest Limited | Information & communication | 2020 |
| DEN 32 Limited | Health & social care | 2025 |
| Dene Terrace Management Limited | Real estate | 2008 |
| Denex Electrics Ltd | Manufacturing | 2016 |
| Denis Stefanov Ltd | Administrative & support | 2026 |
| Deniselianedigital Limited | Wholesale & retail | 2025 |
| Deniz Trucks Ltd | Transport & logistics | 2026 |
| Denmark Lodge RTM Company Limited | Households | 2016 |
| Dennis Lewin Consulting Services Limited | Professional & scientific | 2010 |
| Denny Garden Limited | Households | 1983 |
| Denpro Limited | Real estate | 2020 |
| Dentec Consultancy Ltd | Professional & scientific | 2018 |
| Dentech Services Ltd | Health & social care | 2019 |
| Denton Court (Isleworth) RTM Company Limited | Real estate | 2021 |
| Denton Court Management Co. Limited | Households | 1986 |
| Deodar House Residents Association Limited | Households | 1980 |
| Deoruns Fitness Adventures Ltd | Arts & recreation | 2020 |
| DEP Masi Limited | Hospitality | 2024 |
| Derena Ltd. | Professional & scientific | 2012 |
| Deroco Ltd | Real estate | 2020 |
| Derradda Properties Limited | Real estate | 2017 |
| Dervish & Dervish LLP | | 2019 |
| Derwent Capital Limited | Financial services | 2019 |
| Derwent Court Property Limited | Real estate | 2006 |
| Derwent Investment a Limited | Real estate | 2025 |
| Desert Star Ltd | Real estate | 2019 |
| Desi Eats Ltd | Hospitality | 2025 |
| Design Animal Limited | Professional & scientific | 2005 |