| Devops Technologies Ltd | Information & communication | 2016 |
| Dexterton Limited | Professional & scientific | 2007 |
| DFM Property Limited | Real estate | 2007 |
| DG System Improvement Limited | Administrative & support | 2007 |
| Dgabby Consulting Limited | Professional & scientific | 2017 |
| DGM Property Investments (SW) LLP | | 2023 |
| DHA Land Limited | Real estate | 2019 |
| Dhami Investments Limited | Real estate | 2022 |
| Dharti AB Limited | Health & social care | 2024 |
| Dhillon Jewellers Ltd | Wholesale & retail | 1999 |
| DHP Financial Limited | Wholesale & retail | 1995 |
| DHW Enterprises Ltd | Wholesale & retail | 2016 |
| Dial Glass Limited | Construction | 2006 |
| Diamond Analysis Limited | Information & communication | 1994 |
| Diamond Glazing Ltd | Construction | 2015 |
| Diamond Letting & Property Management Services Limited | Financial services | 1995 |
| Diamond Life Consultancy Limited | Health & social care | 2008 |
| Diamondgates Diverse Services Limited | Real estate | 2007 |
| Dickens' House Wine Emporium Limited | Wholesale & retail | 2005 |
| Dicksons Heating Limited | | 1985 |
| Diesels Direct Limited | Administrative & support | 1998 |
| Digital Media Publishers Limited | Information & communication | 2015 |
| Digital Photo Solutions Limited | Information & communication | 2005 |
| Digital Thought Limited | Information & communication | 2006 |
| Diknow Limited | Information & communication | 2000 |
| Dimmbizz Holding Limited | Information & communication | 2005 |
| Dimmbizz Limited | Information & communication | 2005 |
| Dimond Electrical Building Services Ltd | Energy | 2004 |
| Dinatech Services Limited | Administrative & support | 2010 |
| Dion Cafe Bar & Lounge Ltd | Hospitality | 2024 |
| Direct Care (Kent) Limited | Extraterritorial | 2008 |
| Direct Ceilings Limited | Construction | 1996 |
| Direct Cleaning Supplies Limited | Professional & scientific | 2006 |
| Direct Pump Services Limited | Other services | 2015 |
| Disbotherm Limited | | 1978 |
| Discover Handicrafts Limited | Wholesale & retail | 2020 |
| Discovery Electronics Limited | Manufacturing | 1979 |
| Dishurst Limited | Wholesale & retail | 1982 |
| Dissa Express Ltd | Wholesale & retail | 2026 |
| Diverse Management Limited | Professional & scientific | 2005 |
| DJ & M Facilities Ltd. | Professional & scientific | 2005 |
| DJ & M Secretarial Services Ltd. | Professional & scientific | 2002 |
| DJM Electrical Services Limited | Construction | 2006 |
| DJT Building and Refurbishment Limited | Construction | 2000 |
| DK Bags Ltd | Wholesale & retail | 2014 |
| DLS Howald Ltd | Information & communication | 2021 |
| Dmbm Developments Ltd | Construction | 2020 |
| DMX Cleaning Services Ltd | Real estate | 2015 |
| Dobson and Herring | | 1994 |
| Dockgrange Limited | Water & waste | 1988 |
| Dogan Bros. Limited | Other services | 2004 |
| Dolafun Ltd | Professional & scientific | 1999 |
| Dominion Homes Limited | Real estate | 2003 |
| Domsec Ltd | Information & communication | 2000 |
| Doodles Property Co Ltd | Real estate | 2024 |
| Dortripat - Care Ltd | Administrative & support | 2022 |
| Doubleshaw Productions Ltd | Information & communication | 2025 |
| Doulton Holdings Ltd | Administrative & support | 2022 |
| Dover College Service Company Limited | Professional & scientific | 1995 |
| Dover Demolition and Erection Company Limited | | 1956 |
| Dover Football Club Limited(The) | | 1947 |
| Dover Scaffolding Company Limited | Wholesale & retail | 1960 |
| Downham Nutrition Partnership Limited | Health & social care | 2003 |
| DP Financial Services Limited | Financial services | 2006 |
| DPL EOT Limited | Financial services | 2025 |
| Draco Solutions Limited | Information & communication | 1998 |
| Drain Control 2011 Limited | Arts & recreation | 1989 |
| Drakereed (Contracts) Limited | Wholesale & retail | 1984 |
| Draper Electrical Services Limited | Construction | 1997 |
| Draughting Solutions Limited | Professional & scientific | 2007 |
| Drayton Castle Limited | Manufacturing | 1981 |
| Dream Catcher Moods Limited | Real estate | 2003 |
| Dream Tailoring Limited | Households | 2003 |
| Driftcrown Limited | | 1981 |
| Drivestream Developments Limited | | 1996 |
| Driveways Patios & Fencing Limited | Construction | 2003 |
| DT Rail Construction Management Limited | Professional & scientific | 2014 |
| Dudbrooke House Management Company Limited | Administrative & support | 1979 |
| Dudley Road Nominees Limited | Financial services | 1994 |
| Dumpton Park Garage Limited | Wholesale & retail | 2000 |
| Dunes Flats (Sandwich Bay) Limited(The) | Households | 1970 |
| Durey Castings Limited | Wholesale & retail | 1975 |
| Durham Estates UK Limited | Extraterritorial | 2005 |
| Dutch Sandwall Ltd. | Professional & scientific | 1997 |
| DYE Tabrett Architects Limited | Professional & scientific | 2004 |
| Dyett Warner Investment Limited | Real estate | 2007 |
| Dynamic Accounting Solutions Limited | Real estate | 2007 |
| Dynamic Business Resources Ltd | Professional & scientific | 2016 |
| Dynamic Restaurant Marketing Ltd | Professional & scientific | 2019 |
| Dynamic Webs Limited | Information & communication | 1997 |
| E - Plane Limited | Administrative & support | 2000 |
| E C Bate Limited | Wholesale & retail | 2003 |
| E Goody Properties Limited | Construction | 1976 |
| E K S Digital Solutions Ltd. | Manufacturing | 1999 |
| E Lecaj Construction Ltd | Construction | 2017 |
| E M Electrical Services Limited | Construction | 1997 |
| E P a Services Limited | Construction | 2003 |
| E Street Music Ltd | Wholesale & retail | 2002 |
| E T Ledger & SON Limited | Agriculture & fishing | 1951 |
| E-Ssured Limited | Wholesale & retail | 2003 |