| DK Merchant Ltd | Other services | 2011 |
| DK Transformation Limited | Professional & scientific | 2014 |
| Dkvk Limited | Construction | 2012 |
| DKW Facade Access Design Limited | Professional & scientific | 2016 |
| DM Golf and Events Limited | Professional & scientific | 2020 |
| DM Groundwork Solutions Ltd | Construction | 2018 |
| DMB Law International Limited | Professional & scientific | 2014 |
| DMB Law Limited | Professional & scientific | 2014 |
| Dmcs (CJH) Marketing Services Ltd | Manufacturing | 2017 |
| DME Computer Services Limited | Information & communication | 1995 |
| DMF Electrics Limited | Administrative & support | 2015 |
| DMG Technology Ltd | Information & communication | 2026 |
| Dmgt Advisory LLP | | 2019 |
| DML Property Investment Limited | Construction | 2024 |
| Doan Energy Limited | Professional & scientific | 2025 |
| DOC Professional Services Limited | Administrative & support | 2010 |
| Dogtropolis Ltd | Wholesale & retail | 2021 |
| Dominic Associates Ltd | Real estate | 2012 |
| Dominic Emerald Limited | Real estate | 2026 |
| Dominic Walmsley Jewellery Ltd | Manufacturing | 2005 |
| Domus Meus Properties Ltd | Construction | 2023 |
| Donadio J Limited | Wholesale & retail | 2018 |
| Doniert Consulting Ltd | Information & communication | 2017 |
| Doorknobs Limited | Real estate | 2007 |
| Doorsteps (Kent) Ltd | Hospitality | 2006 |
| Dorado Consultancy Limited | Professional & scientific | 2015 |
| Dormer Cottage Limited | Construction | 2024 |
| Dostlr House Ltd | Financial services | 2024 |
| Dotdash Wayfinding Ltd | Professional & scientific | 2025 |
| Dotti Ltd | Information & communication | 2025 |
| Double SIX Group Ltd | Professional & scientific | 2021 |
| Dove Concepts Limited | Financial services | 2015 |
| Dovestone Estates Limited | Health & social care | 1963 |
| Down the Line Group (DTL) Properties Ltd | Real estate | 2021 |
| Down the Line Group Holdings Ltd | Financial services | 2022 |
| Down the Line Group Ltd | Administrative & support | 2017 |
| Downs House Management Company Limited | Households | 1990 |
| Downs View Consulting Limited | Administrative & support | 2025 |
| Downsview Leisure Ltd | Hospitality | 2021 |
| Downsview North Limited | Households | 2020 |
| Downsview Property Management Limited | Households | 2018 |
| Downview Homes Ltd | Construction | 2019 |
| DPC Home Consultants Ltd | Construction | 2024 |
| DR Kilbey Psychology Ltd | Health & social care | 2025 |
| DR Szychot Paediatric Oncology Limited | Health & social care | 2022 |
| Drabland Limited | Households | 1980 |
| Dragonfly Exhibition and Media Recruitment Ltd | Administrative & support | 2007 |
| Drainage Assist Ltd | Construction | 2025 |
| Dream Espana UK Limited | Health & social care | 2002 |
| Dreamers & Creators Limited | Information & communication | 2013 |
| Dreamhush Limited | Wholesale & retail | 2026 |
| Dreamspout Ltd. | Hospitality | 2016 |
| Dreamwell Investments Ltd | Real estate | 2006 |
| Drivers Direct Logistics Ltd | Transport & logistics | 2015 |
| Drivers Direct Recruitment Group Limited | Administrative & support | 2011 |
| DRM Trees Ltd | Administrative & support | 2020 |
| Dronebotica Limited | Extraterritorial | 2024 |
| Dronebotics Ltd | Extraterritorial | 2024 |
| DRR Consulting Limited | Professional & scientific | 2025 |
| DRS Bond Management Limited | Financial services | 2009 |
| Drsd Marketing Limited | Professional & scientific | 2016 |
| Drtr Ltd | Manufacturing | 2021 |
| Drunken Jester Games Ltd | Arts & recreation | 2023 |
| DRY Bank Court Residents Company Limited | Households | 1963 |
| DRY Logic Limited | Construction | 2026 |
| Dryhill Ltd | Construction | 2010 |
| DSB Building Ltd | Manufacturing | 2022 |
| Dstn Services Ltd | Water & waste | 2022 |
| DTC Services Limited | Real estate | 2025 |
| Dtcarrepairs Ltd | Wholesale & retail | 2018 |
| DU Plessis Consulting Ltd | Professional & scientific | 2012 |
| Ducteam Limited | Construction | 2005 |
| Duga Digital Ltd | Professional & scientific | 2021 |
| Dulce's Cakes & Patisserie Limited | Wholesale & retail | 2016 |
| Dumonde Limited | Professional & scientific | 1989 |
| Dunamus Enterprises Ltd | Wholesale & retail | 2025 |
| Duncan Simpson Ltd | Administrative & support | 2003 |
| Dundale Nominees Limited | Financial services | 2021 |
| Dunn and SON Couriers Ltd | Transport & logistics | 2025 |
| Dunorlan Park Management Company Limited | Real estate | 2011 |
| Dunorlan Vista Limited | Households | 2018 |
| Dunton Green Investment Limited | Financial services | 2013 |
| Durnford Capital Holdings Ltd | Financial services | 2026 |
| Dvash Rock Ltd | Information & communication | 2022 |
| Dvwg Ltd | Construction | 2015 |
| DXG Law Limited | Professional & scientific | 2022 |
| Dynasty Strategics Limited Partnership | | 2013 |
| E & D 2026 Limited | Hospitality | 2025 |
| E a Services (SE) Limited | Construction | 2001 |
| E-Sirket Ltd | Professional & scientific | 2021 |
| E-Type Spares Limited | Wholesale & retail | 2014 |
| E.D.C. International Limited | Manufacturing | 1984 |
| E.J. Cocker & SON (Holdings) Ltd | Financial services | 2017 |
| E.J. Cocker & SON Ltd | Construction | 2003 |
| E.J.Markham & SON Limited | Wholesale & retail | 1948 |
| E.L.T Southern Limited | Real estate | 2016 |
| E.P.Pinnock Upholstery Limited | Manufacturing | 1968 |
| Eagle E-Types Limited | Wholesale & retail | 2011 |
| Eagle Heights Wildlife Foundation | Arts & recreation | 2013 |
| Eagle Racing Limited | Wholesale & retail | 1988 |