| Deux Chat Pre-Schools Limited | Education | 2012 |
| Devale Consulting Limited | Professional & scientific | 2022 |
| Devenish Designs Limited | | 1983 |
| Devil Incarnate Productions Ltd | Information & communication | 2020 |
| Devine-Creative Ltd | Health & social care | 2022 |
| Devitec Ltd | Professional & scientific | 2025 |
| Devopsec Ltd | Information & communication | 2017 |
| Dewise Enterprises Ltd | Wholesale & retail | 2021 |
| Dexon Ltd | Construction | 2025 |
| DFD Products Limited | Construction | 2025 |
| DH Business Solutions Ltd | Professional & scientific | 2014 |
| DH Photography Limited | Professional & scientific | 2014 |
| Dial Square Football Club Ltd | Arts & recreation | 2020 |
| Diamond Dance Enterprises Limited | Arts & recreation | 2010 |
| Diamond Dancentre Limited | Arts & recreation | 1999 |
| Diamond Travel Limited | Administrative & support | 2000 |
| Diffusion Productions Limited | Arts & recreation | 2021 |
| Diffusion Theatrical Limited | Arts & recreation | 2026 |
| Digigurkhas Limited | Information & communication | 2022 |
| Digital Dive Marketing Limited | Professional & scientific | 2025 |
| Digital Experts Academy Ltd | Information & communication | 2015 |
| Digital Hummingbird Limited | Information & communication | 2022 |
| Digital Media Blur Limited | Information & communication | 2010 |
| Digital Road Ltd | Information & communication | 2023 |
| Digital Sage Marketing Limited | Other services | 2019 |
| Digital Tachograph Centre Limited | Wholesale & retail | 2011 |
| Digitalpc Ltd | Information & communication | 2005 |
| Directech Global Limited | Manufacturing | 2020 |
| Discount Carpets Direct Limited | Wholesale & retail | 2014 |
| Discreet Affairs Ltd | Information & communication | 2026 |
| Disruptor Events Ltd | Arts & recreation | 2020 |
| Divo Autos Limited | Wholesale & retail | 2010 |
| DJK Motorcycles Ltd | Wholesale & retail | 2021 |
| DK Household Brands Limited | Wholesale & retail | 1976 |
| Dkhd Limited | Real estate | 2020 |
| DLB Composites Ltd | Manufacturing | 2015 |
| DLP Property Services Ltd | Construction | 2019 |
| DM Electric Limited | Construction | 2009 |
| DMC Controls Limited | Professional & scientific | 2010 |
| DMM Investments Limited | Administrative & support | 2015 |
| DNM Security and Fire Limited | Construction | 2013 |
| Docucraft Collective Ltd | Administrative & support | 2026 |
| Doing Energy Ltd | Professional & scientific | 2019 |
| Dome MK Ltd | Information & communication | 2019 |
| Domestic Electrical Installations Ltd | Construction | 2010 |
| Domus Developments London Ltd | Wholesale & retail | 2004 |
| Domus Living Limited | Construction | 2010 |
| Dopson Butchers Limited | Manufacturing | 2009 |
| Doran Ventures Limited | Administrative & support | 2017 |
| Dotdot Films Ltd | Information & communication | 2024 |
| Dotwelle Ltd | Administrative & support | 2022 |
| Double Elephant Creative Limited | Arts & recreation | 2014 |
| Douglas Stewart EDU Limited | Information & communication | 2004 |
| Douthwaite Developments Ltd | Construction | 2020 |
| Douthwaite Holdings Ltd | Construction | 2022 |
| Down to the Detail Ltd | Administrative & support | 2020 |
| Downton Homes (Ewshot) Limited | Construction | 2022 |
| Downton Homes Ltd | Construction | 1993 |
| DP Evolved Ltd | Administrative & support | 2026 |
| Drainage and Maintenance UK Ltd | Water & waste | 2023 |
| Drakes Consultant Services UK Ltd | Information & communication | 2013 |
| Drakonfx Limited | Information & communication | 2019 |
| Drayton Court Residents Association (1994) Limited | Households | 1994 |
| Dream Image Limited | Information & communication | 2016 |
| Dreamscape Garden Management Ltd | Administrative & support | 2015 |
| Driftwood Cottages Ltd | Hospitality | 2025 |
| Drinix Limited | Professional & scientific | 2025 |
| Drinkin Cocktails Ltd | Administrative & support | 2020 |
| Dripcart Limited | Wholesale & retail | 2025 |
| Drws Professional Flat Pack Instalation and Removals Ltd | Transport & logistics | 2022 |
| DRY & Restore Limited | Construction | 2024 |
| DS Technical Services UK Limited | Construction | 1996 |
| DTL Legal Ltd | Professional & scientific | 2022 |
| DTU Comms Limited | Construction | 2007 |
| DTW Trade Windows Ltd | Construction | 2019 |
| DUB Juniors Ltd | Arts & recreation | 2019 |
| Duiok SR Limited | Wholesale & retail | 2026 |
| Dujra Ltd | Arts & recreation | 2022 |
| DUX Inc Ltd | Wholesale & retail | 2025 |
| DX Systems Ltd | Manufacturing | 2011 |
| DXC UK Emea Finance Limited | Professional & scientific | 1997 |
| DXC UK Holdings Limited | Financial services | 2009 |
| DXC UK International Holdings Limited | Financial services | 2009 |
| DXC UK International Limited | Information & communication | 2009 |
| DXC UK International Operations Limited | Financial services | 2009 |
| DXC UK Trustee Limited | Professional & scientific | 1993 |
| DXS Property Ltd | Real estate | 2022 |
| Dynamic Image Limited | Information & communication | 2002 |
| Dynamic Systems Agility Consulting Ltd | Information & communication | 2025 |
| Dyon Property Limited | Real estate | 2026 |
| Dyton Landscapes Limited | Administrative & support | 2025 |
| E & J Development & Investments Ltd | Construction | 2010 |
| E & P Construction Services Limited | Construction | 2021 |
| E N Properties Limited | Real estate | 2025 |
| E-Mediavision Limited | Information & communication | 2000 |
| E-Tec Innovation Limited | Professional & scientific | 2011 |
| E-Tec Power Management Limited | Manufacturing | 1999 |
| E.G.C. Interiors Ltd | Construction | 2018 |
| East to West Consulting Limited | Professional & scientific | 2024 |
| Eastenderz Ltd | Information & communication | 2018 |