| Dasio Limited | Construction | 1985 |
| Data Mill (DP) Limited | Professional & scientific | 2000 |
| Data Technics IT Limited | Information & communication | 2002 |
| Data to Information Limited | Information & communication | 1996 |
| Database Management Solutions Limited | Information & communication | 1998 |
| Datarun Solutions Limited | Information & communication | 1996 |
| Dattani & Co Ltd | Professional & scientific | 2004 |
| Dave Wright Services Limited | Wholesale & retail | 1998 |
| David Allan Computing Limited | Information & communication | 2004 |
| David Allen Holdings Limited | Professional & scientific | 1966 |
| David Conway & Co Limited | Real estate | 2005 |
| David Greenall and Associates Ltd | Professional & scientific | 2024 |
| David Olsen Joinery Limited | Construction | 2002 |
| David Smith Products and Systems Limited | Manufacturing | 2003 |
| David Warren & Co. Limited | Professional & scientific | 2007 |
| Davidsons Garden Maintenance Limited | Administrative & support | 2002 |
| Davis Estates (Anglia) Limited | Administrative & support | 1972 |
| Dawnlight Limited | Manufacturing | 1987 |
| Day Equestrian Limited | Extraterritorial | 2005 |
| Day Waste Management Limited | Extraterritorial | 1998 |
| Day's Recycling Limited | Extraterritorial | 1997 |
| Dayan P. Toledano Charitable Trust Limited | Education | 1982 |
| Daymar Estates (Paul ST) Limited | Real estate | 1963 |
| Daysha Investment Management Limited | Professional & scientific | 2008 |
| DBS Consultancy Limited | Administrative & support | 2002 |
| DC Vehicle Maintenance Ltd | Wholesale & retail | 2015 |
| DDD & Sons Limited | Real estate | 2017 |
| DDD Enterprises Limited | Real estate | 2010 |
| DDK Systems Limited | Other services | 2006 |
| DE Rigeur Limited | Financial services | 1998 |
| DE Veres Trade Finance Limited | Financial services | 1997 |
| DE Villiers Surveyors Limited | Professional & scientific | 2003 |
| DE Voil Consulting Limited | Information & communication | 1990 |
| Deansbrooks Care Centre Limited | Health & social care | 2007 |
| Deanwilliams Services Ltd | Health & social care | 2012 |
| Dearne Properties Limited(The) | Real estate | 1954 |
| Deborah Management Limited | Households | 1985 |
| Debra Stevens Training Coaching Ltd | Professional & scientific | 2015 |
| Debt Advisory Limited | Professional & scientific | 2002 |
| Decadent Properties Limited | Construction | 1999 |
| Declan. Flynn | | 1998 |
| Decor Kitchens (UK) Limited | Wholesale & retail | 2002 |
| Dedoc Software Limited | Information & communication | 1999 |
| Defunkt Century Limited | Information & communication | 2002 |
| Deheer Empire Ltd | Wholesale & retail | 2021 |
| Dekay Management Limited | Real estate | 1996 |
| Delacey Professional Services Limited | Professional & scientific | 2004 |
| Delaney Design & Build Limited | Construction | 2002 |
| Delegate Select Ltd | Information & communication | 2006 |
| Deli Itali Enfield Ltd | Wholesale & retail | 2020 |
| Delta Invest Ltd | Professional & scientific | 2012 |
| Delta Study Ltd | Education | 2013 |
| Demea Limited | Other services | 2008 |
| Dene Road Residents Limited | Households | 1995 |
| Denthouse Limited | Administrative & support | 2005 |
| Departure Limited | Extraterritorial | 2000 |
| Dependable Homes Limited | Construction | 1949 |
| Dermot Power Concept Design Limited | Information & communication | 2012 |
| Desai Medical Services Limited | Real estate | 2002 |
| Design Photography Illustration Limited | Other services | 2007 |
| Designed Environmental Engineering Limited | Wholesale & retail | 1978 |
| Designvital Limited | Hospitality | 1991 |
| Destiny House Ltd | Health & social care | 2008 |
| Deureka Limited | Professional & scientific | 2000 |
| Devani Limited | Information & communication | 2005 |
| Devdan Limited | Real estate | 2025 |
| Deviate Creative Limited | Professional & scientific | 2015 |
| Devine Care Ltd | Administrative & support | 2007 |
| Devprem Investments Limited | Real estate | 2017 |
| DEY Medical Services Ltd | Health & social care | 2010 |
| Dezi Limited | Wholesale & retail | 2001 |
| DFB Heating Services Ltd | Other services | 2023 |
| Dfcl Properties Limited | Real estate | 2017 |
| Dhaliwal Enterprises Limited | Hospitality | 2018 |
| Dhamecha Foods Limited | Wholesale & retail | 1974 |
| Dhani Ltd | Construction | 2020 |
| Dharsi & Co Limited | Professional & scientific | 2004 |
| Dhatt Property Limited | Real estate | 2020 |
| Dhilan Properties Ltd | Real estate | 2001 |
| Dhiman Real Estate Ltd | Real estate | 2017 |
| DHL Property Services Ltd | Real estate | 2000 |
| Di-Mot Limited | Construction | 2010 |
| Dial a Digger Limited | Extraterritorial | 2003 |
| Diamber Limited | Extraterritorial | 2007 |
| Diamond Contractors Limited | Construction | 2005 |
| Diana Silver Consultancy Ltd | Administrative & support | 2004 |
| Dibs Distribution Limited | Wholesale & retail | 1987 |
| Differentia Design and Management Limited | Administrative & support | 2003 |
| Digiprints Pro Limited | Wholesale & retail | 2005 |
| Digisphere Capital Ltd | Real estate | 2002 |
| Digitech Consultancy Limited | Information & communication | 2016 |
| Dilip Patel Associates Limited | Administrative & support | 1995 |
| Dilson Management Services Limited | Real estate | 2001 |
| Dilsons Properties Ltd | Real estate | 2019 |
| Dinecross Limited | Wholesale & retail | 2002 |
| Disability Resource Team Limited | Other services | 2004 |
| Dish Creative Ltd | Information & communication | 2020 |
| Diskberry Limited | Information & communication | 1987 |
| Divinity 9 Ltd | Professional & scientific | 2015 |
| DJW (Europe) Limited | Financial services | 2017 |