| Dalton Court RTM Company Limited | Households | 2024 |
| DAM (Brighton) Ltd | Administrative & support | 2023 |
| Dama Ventures Limited | Wholesale & retail | 2021 |
| Damian 2020 Ltd | Transport & logistics | 2020 |
| Damstar Properties Ltd | Real estate | 2025 |
| DAN and LOR Property Limited | Professional & scientific | 2004 |
| DAN Baker Contracting Ltd | Construction | 2025 |
| DAN Jackson Image Creation Ltd | Manufacturing | 2026 |
| Dancin Devotion Event Solutions Ltd | Arts & recreation | 2021 |
| Dancing White BEE Limited | Professional & scientific | 2021 |
| Dandelion Time | Education | 2003 |
| Dandy Designers Ltd | Wholesale & retail | 2023 |
| Danegate Media Limited | Professional & scientific | 2021 |
| Danegate Property Limited | Real estate | 2021 |
| Danehurst Properties Limited | Extraterritorial | 2010 |
| Dani 20-18 Ltd | Transport & logistics | 2019 |
| Danias Resources LLP | | 2013 |
| Daniel 89 Limited | Transport & logistics | 2019 |
| Daniel Benn Services Limited | Mining & quarrying | 2025 |
| Daniel Hogan Limited | Construction | 2015 |
| Daniel Johns Liverpool Ltd | Real estate | 2016 |
| Daniel Parker Ltd | Wholesale & retail | 2018 |
| Daniel Pullen Photography Limited | Professional & scientific | 2007 |
| Danielle Metz Ltd | Professional & scientific | 2019 |
| Danienell Limited | Professional & scientific | 2026 |
| Danil Solutions Ltd | Administrative & support | 2018 |
| DANIMIRA1 Trans Ltd | Transport & logistics | 2018 |
| Danny Pope Decorating Services Ltd | Construction | 2023 |
| Danny's Decorating Ltd | Construction | 2014 |
| Danola Holdings Limited | Real estate | 2025 |
| Danos Ltd | Transport & logistics | 2023 |
| Danous Limited | Agriculture & fishing | 2010 |
| Dansan Fire Protection Ltd | Construction | 2025 |
| Dansway Limited | Transport & logistics | 2007 |
| Dantry Utilities Ltd | Administrative & support | 2022 |
| Danube Business Consulting Ltd. | Financial services | 2015 |
| Dapper Wrapper Ltd | Wholesale & retail | 2020 |
| Darabase Limited | Information & communication | 2019 |
| Darcelle LUX Cleaning Limited | Administrative & support | 2026 |
| Darchan Ltd | Professional & scientific | 2024 |
| Daren Seal Associates Limited | Construction | 2008 |
| Darenth River Ballast Company Limited(The) | Real estate | 1932 |
| Darinovtmt Ltd | Transport & logistics | 2019 |
| Dark Index Ltd | Wholesale & retail | 2024 |
| Darkas Ltd | Administrative & support | 2022 |
| Darley Meads Limited | Households | 2002 |
| Darren Stone Ltd | Administrative & support | 2012 |
| Dartnell Creative Limited | Other services | 2021 |
| Darwin Court "a" Management Company Limited | Households | 1994 |
| Darwoods Trading Limited | Wholesale & retail | 2018 |
| DAS Heating & Plumbing Supplies Ltd | Wholesale & retail | 2008 |
| Dasaro Limited | Administrative & support | 2013 |
| Dashwood Estates Limited | Construction | 2007 |
| Data and Wireless Ltd | Construction | 2015 |
| Data GAP Solutions Limited | Administrative & support | 2017 |
| Datadoc Ltd | Information & communication | 2023 |
| Datateam Business Media Limited | Information & communication | 1983 |
| Datateam Media and Communications Group Limited | Professional & scientific | 1990 |
| Datatron Document Image Archiving Limited | Information & communication | 1996 |
| Datingnightmares.Com Limited | Extraterritorial | 2018 |
| Dattani and Dattani Limited | Information & communication | 2023 |
| Dave Barnett Motors Ltd | Wholesale & retail | 2007 |
| Dave Hewett Technical Services Ltd | Construction | 2009 |
| Dave Whiffing Consultancy Ltd | Education | 2011 |
| David a Limited | Information & communication | 2015 |
| David Catt (Spitalfields) Holdings Limited | Financial services | 2009 |
| David Clark Farms Limited | Agriculture & fishing | 1954 |
| David Corcoran Limited | Information & communication | 2013 |
| David Dexter International Limited | Construction | 2017 |
| David Hicken Associates Limited | Professional & scientific | 2006 |
| David J Whitlock Building Contractors Ltd | Construction | 2017 |
| David John Developments Limited | Construction | 2014 |
| David Motors Kent Limited | Wholesale & retail | 2018 |
| David Parfitt Landscape Consultancy Ltd | Professional & scientific | 2014 |
| David Pateman Limited | Professional & scientific | 2010 |
| David Veevers Limited | Agriculture & fishing | 2010 |
| David Williamson Construction Limited | Construction | 2024 |
| Davies Design Co Ltd | Professional & scientific | 2025 |
| Davy & Sons Consultancy Ltd | Professional & scientific | 2026 |
| Dawatem Global Sourcing Ltd | Real estate | 2025 |
| Dawatem Ltd | Wholesale & retail | 2015 |
| Dawlin Property Management Limited | Real estate | 2003 |
| Dawlin RTM Limited | Real estate | 2004 |
| Dawson's Workshop Ltd | Manufacturing | 2022 |
| Day Late Dollar Short Ltd | Hospitality | 2024 |
| Day Tree Fellers Ltd | Agriculture & fishing | 2023 |
| Dayrise Studios Ltd | Arts & recreation | 2023 |
| Dayson Physio & Sports Rehab Ltd | Health & social care | 2013 |
| Daystars Home Ltd | Health & social care | 2024 |
| DAZA1912 Ltd | Transport & logistics | 2019 |
| Dazfab Limited | Manufacturing | 2019 |
| Dazoom Ltd | Professional & scientific | 2010 |
| Dazzle Developments Ltd | Financial services | 2020 |
| DB Carpenter Ltd | Construction | 2015 |
| DB Cleaners Limited | Administrative & support | 2025 |
| DB Hifi Limited | Wholesale & retail | 2014 |
| DB Rail Infrastructure Ltd | Construction | 2025 |
| DB Ring Hire Limited | Administrative & support | 2022 |
| Dbkb Holdings Ltd | Real estate | 2024 |
| DBL Brickwork Ltd | Construction | 2022 |