| Dannalysis Limited | Information & communication | 2005 |
| Danny Properties Ltd | Hospitality | 2024 |
| Danofiel Ltd | Information & communication | 2022 |
| DAO Business Solutions Limited | Hospitality | 2006 |
| Dapt Agrochemicals Limited | Manufacturing | 1990 |
| DAR Business Services Limited | Real estate | 2002 |
| Dara Builders Ltd | Construction | 2015 |
| Darius Development Limited | Manufacturing | 2006 |
| Darlington House (Surbiton) Residents Association Limited | Hospitality | 1977 |
| Darmisha Retail Limited | Wholesale & retail | 2014 |
| DARTSEVENTS4U Ltd | Arts & recreation | 2013 |
| Dashboard Consulting Limited | Manufacturing | 2007 |
| Data & Analytics Ltd | Other services | 2017 |
| Data Medical Communications Limited | Administrative & support | 2024 |
| Data Simplexity Limited | Information & communication | 2008 |
| Data Xform Limited | Professional & scientific | 2023 |
| Datacave Limited | Real estate | 1977 |
| Datagraphia Limited | | 1986 |
| Dataset Electrical Limited | Construction | 2001 |
| Datatech Solutions Ltd | Information & communication | 2005 |
| Datazone Systems Limited | Information & communication | 2000 |
| Datta Power Technologies Ltd | Information & communication | 2019 |
| Dave Glass Productions Limited | Information & communication | 1998 |
| David Akera Engineers Limited | Professional & scientific | 2016 |
| David Atkinson Lighting Design Limited | Administrative & support | 2001 |
| David Attenborough (Productions) Limited | Information & communication | 1958 |
| David Barron Limited | Professional & scientific | 2015 |
| David Guthrie & Co. Limited | | 1983 |
| David I H Wright Ltd | Professional & scientific | 2001 |
| David Ledesma Limited | Professional & scientific | 2005 |
| David Muncer Associates Limited | Professional & scientific | 2002 |
| David Osborne Associates Limited | Professional & scientific | 2003 |
| Davies-Elise Consulting Limited | Professional & scientific | 2002 |
| Davtee Construction Limited | Construction | 1973 |
| Davtee Holdings Limited | Construction | 1978 |
| Davuka GRP Limited | Wholesale & retail | 2003 |
| DB Allbuilding Services Limited | Construction | 2007 |
| DB Amplification Limited | Professional & scientific | 2006 |
| DC Financial Consulting Ltd | Financial services | 2005 |
| DCC Precision Ltd | Administrative & support | 2021 |
| Dd's Meals Catering Services Ltd | Hospitality | 2022 |
| DE Lord & Company Limited | Extraterritorial | 2003 |
| Dealmutual Property Management Limited | Households | 1994 |
| Debbie Holdings Limited | Financial services | 2005 |
| Deboco Ltd | Professional & scientific | 2007 |
| Decatur Management Group Limited | Professional & scientific | 2021 |
| Decorbar Limited | Real estate | 1993 |
| DEE Mark and General Properties Limited | Real estate | 1982 |
| Deep Residence Ltd | Real estate | 2021 |
| Deergate Limited | Construction | 2002 |
| Del.Engineering Services Ltd | Construction | 2016 |
| Delaney Browne Limited | Administrative & support | 1999 |
| Delen Tooling Limited | Manufacturing | 2006 |
| Dellam Corporate Information Limited | Information & communication | 1999 |
| Dellam Publishing Limited | Information & communication | 2005 |
| Delta 9 Ltd | Construction | 2009 |
| Delta Industrial Limited | Wholesale & retail | 1997 |
| Delta Line Luxury Mini Buses Limited | Transport & logistics | 2001 |
| Delta Training Limited | | 1986 |
| Deltrak Services Ltd | Administrative & support | 1997 |
| Denefield Drive Management Company Limited | Households | 1986 |
| Denelm Limited | Real estate | 2000 |
| Denny Tools Limited | Extraterritorial | 1976 |
| Derivatives and Capital Markets Education Limited | Education | 2004 |
| Derma Clinic Limited | Health & social care | 2012 |
| Dermalogica (UK) Limited | Wholesale & retail | 1988 |
| Derwent Property Developments Limited | Construction | 1994 |
| DES Media Group Limited | Professional & scientific | 1996 |
| Descomp Ltd | Information & communication | 1990 |
| Desert Wolf Limited | Wholesale & retail | 2002 |
| Deshi Liqueur Ltd | Manufacturing | 2005 |
| Design and Art Direction Company Limited(The) | Arts & recreation | 1977 |
| Design Forensics Limited | Professional & scientific | 2006 |
| Design Gallery 98 Ltd | Other services | 2015 |
| Design IT Consulting Limited | Professional & scientific | 1996 |
| Designcourse Limited | Information & communication | 1993 |
| Designer Print (West London) Limited | | 1987 |
| Designs for ALL Occasions Limited | Other services | 1997 |
| Desres Properties Limited | Construction | 2003 |
| Destiny Network Solutions Limited | Information & communication | 1998 |
| Detailed Inventories Limited | Real estate | 2005 |
| Detracourt Limited | Construction | 1987 |
| Develop by Design Limited | Construction | 2006 |
| Developlan Limited | Professional & scientific | 2005 |
| Devine Holdings Limited | Professional & scientific | 2000 |
| Devine Homes PLC | Construction | 1985 |
| Devolli Constructions Ltd | Construction | 2019 |
| Devono Installations Ltd | Construction | 2003 |
| Dewgard Window Co. Limited(The) | Construction | 1985 |
| Dewsbury Court (Management) Limited | Households | 1982 |
| DF Motors Ltd | Manufacturing | 2021 |
| DF20 Limited | Wholesale & retail | 2004 |
| DFB Limited | Transport & logistics | 2006 |
| DG Change Consulting Limited | Administrative & support | 2022 |
| Dhaawin Holdings Ltd | Real estate | 2022 |
| Dharam Paul & Sons Investments Ltd | Real estate | 2017 |
| Dhilan Trading Ltd | Wholesale & retail | 2018 |
| Dhvani Consulting Limited | Information & communication | 2014 |
| Dhysham Enterprises Ltd | Wholesale & retail | 2016 |
| Diana Impex Limited | Wholesale & retail | 2012 |