| Dawn Health Ltd | Health & social care | 2025 |
| Dawson Healy Construction Limited | Administrative & support | 2013 |
| Day 2 Day Building Contractors Limited | Construction | 2013 |
| Dayo&G Multiservices Ltd | Administrative & support | 2023 |
| Days Consulting Ltd | Transport & logistics | 2016 |
| Dayton Transport Ltd | Transport & logistics | 2022 |
| Dbconnect Services Limited | Information & communication | 2010 |
| Dbdp Developments Ltd | Construction | 2017 |
| Dcabling Communications Ltd | Construction | 2011 |
| DCC Homes Ltd | Real estate | 2024 |
| DCP Commercial Limited | Construction | 2016 |
| DCP Fontenoy Limited | Construction | 2015 |
| DCP London Ltd. | Construction | 2013 |
| DCP Management Ltd | Real estate | 2018 |
| DCP Residential 2 Limited | Real estate | 2017 |
| DCP Residential Limited | Real estate | 2016 |
| DD Autofix Ltd | Wholesale & retail | 2017 |
| DD Waste Management Limited | Water & waste | 2025 |
| Ddats Ltd | Information & communication | 2025 |
| DDD 4ME Ltd | Transport & logistics | 2017 |
| Ddlf Consult Limited | Professional & scientific | 2025 |
| DDP Invest Ltd | Real estate | 2016 |
| DDP Investments Ltd | Real estate | 2016 |
| DDS - ACP Projects Limited | Professional & scientific | 2016 |
| DE Sousa Holdings Ltd. | Extraterritorial | 2022 |
| DE Winter Touring Limited | Transport & logistics | 2019 |
| De-Tales Limited | Other services | 2006 |
| Deadline Creative Limited | Information & communication | 2008 |
| Deadlock Motorcycles Limited | Wholesale & retail | 2024 |
| Dealynx Ltd | Wholesale & retail | 2020 |
| Debtbridge Ltd | Financial services | 2025 |
| Deccan Soft Technologies Ltd | Wholesale & retail | 2026 |
| Decent Building Solutions Limited | Construction | 2018 |
| Decimus Developments HA Limited | Construction | 2016 |
| Deco & Ware Ltd | Wholesale & retail | 2020 |
| Decorative Ltd | Construction | 2019 |
| Decorr Limited | Construction | 1997 |
| Decus Railway Engineering UK Ltd | Manufacturing | 2025 |
| Decxterity Limited | Real estate | 2025 |
| Dedim 2019 Limited | Transport & logistics | 2019 |
| Deedee's Thai Kitchen Ltd | Hospitality | 2025 |
| Deepsearch Analytics Ltd | Information & communication | 2020 |
| Deepsu Limited | Professional & scientific | 2025 |
| Definition Skin Aesthetics Ltd | Other services | 2017 |
| Defj Ltd | Professional & scientific | 2018 |
| Defn Limited | Manufacturing | 2021 |
| Defoe Interiors Limited | Manufacturing | 2004 |
| Deliberate Limited | Professional & scientific | 2020 |
| Delight Pizza Base Ltd | Hospitality | 2022 |
| Deliver Your Parcel Limited | Transport & logistics | 2022 |
| Della Properties Limited | Real estate | 2025 |
| Delostar Management Company Limited | Households | 1986 |
| Delta Healthcare UK Limited | Real estate | 2007 |
| Delta Properties (Kent) Limited | Real estate | 2002 |
| Demac Investments Limited | Real estate | 1998 |
| Deneb Properties Ltd | Real estate | 2019 |
| Denebrook Freehold Limited | Households | 2008 |
| Denebrook Management Company Limited | Households | 1975 |
| Deniz Selin Limited | Hospitality | 2019 |
| Denkemp Ltd | Arts & recreation | 2018 |
| Denney Place Management Limited | Professional & scientific | 2001 |
| Dennison & Co Limited | Professional & scientific | 1996 |
| Denova K Limited | Professional & scientific | 2014 |
| Dent Eraser Ltd | Wholesale & retail | 2025 |
| Denteeth Ltd | Health & social care | 2025 |
| Denver Commercial LLP | | 2021 |
| Derek Stores Limited | Wholesale & retail | 1945 |
| Dermishaj Limited | Manufacturing | 2020 |
| DESFACT1 Ltd | Hospitality | 2020 |
| Design Dance Ltd | Arts & recreation | 2022 |
| Design Driveways & Landscaping Ltd | Construction | 2017 |
| Design JD Limited | Professional & scientific | 2015 |
| Designer Desserts Ltd | Hospitality | 2026 |
| Designer Marble Limited | Wholesale & retail | 2018 |
| Designers Forever Limited | Information & communication | 2011 |
| Designplan Lighting Limited | Manufacturing | 1963 |
| Desirabullz Group Ltd | Extraterritorial | 2021 |
| Desire (UK) Limited | Other services | 2013 |
| Desmier Consulting and Coaching Limited | Professional & scientific | 2018 |
| Detact Limited | Hospitality | 1977 |
| Detail Construction Ltd | Construction | 2013 |
| Detail Consulting Ltd | Real estate | 2019 |
| Development Intelligence Limited | Professional & scientific | 2009 |
| Devine Civil Engineering Ltd | Construction | 2017 |
| Devine Homes Land Ltd | Real estate | 2005 |
| Devine Properties Ltd | Real estate | 2017 |
| Devonport Restaurant Ltd | Hospitality | 2019 |
| Devonshire House (Sutton) Residents Company Limited | Households | 1964 |
| Devonshire Technology Ltd | Administrative & support | 2020 |
| Devsuccess Limited | Information & communication | 2012 |
| Dezzbuild Ltd | Construction | 2019 |
| DFG Media Ltd | Information & communication | 2021 |
| DG Accountancy Services Limited | Professional & scientific | 2011 |
| DG Dent Ltd | Health & social care | 2025 |
| DG Management Consultancy Limited | Administrative & support | 2014 |
| DGD Electrical Services Ltd | Construction | 2010 |
| Dgoode Limited | Construction | 2018 |
| DGP Time Scenery Ltd | Administrative & support | 2020 |
| Dground Limited | Real estate | 2017 |
| DGS Scaffold Ltd | Construction | 2025 |