| Dave Bradford Limited | Arts & recreation | 2006 |
| Davenport House (Freehold) Limited | Households | 2013 |
| Davey, Paxman & Co Ltd | Professional & scientific | 2021 |
| David J. Powell Surveys Limited | Professional & scientific | 1992 |
| David Mouland Haulage Limited | Transport & logistics | 2004 |
| David Mouland Ltd | Transport & logistics | 2020 |
| Davidson Country Park Homes | | 2001 |
| Davidson Gray Ltd | Real estate | 2020 |
| Davidson Homes Ltd | Construction | 2007 |
| Dawn Spencer Ltd | Professional & scientific | 2023 |
| Dawson Engineering (Burley) Limited | Wholesale & retail | 1947 |
| DE Burgh Limited | | 1988 |
| Dealbuyer (UK) Ltd | Wholesale & retail | 2014 |
| Dean Plasterers Limited | Extraterritorial | 2014 |
| Deanwood House (Branksome Park) Freehold Limited | Households | 2025 |
| Deanwood House Management Company Limited | Households | 2000 |
| Debbie Barker Property Consultancy Ltd | Real estate | 2014 |
| Decibel International Ltd | Professional & scientific | 2022 |
| Decruz Urology Limited | Health & social care | 2020 |
| Deernala Limited | Professional & scientific | 2005 |
| Dega Broadcast Systems Limited | Administrative & support | 2005 |
| Dene Construction Limited | Construction | 1993 |
| Denhayn Limited | Administrative & support | 2015 |
| Denigma Ltd | Information & communication | 2018 |
| Denmark Wharf Residents Management Company Limited | Households | 2003 |
| Densome Developments Ltd | Construction | 2013 |
| Depot Dynamic Limited | Wholesale & retail | 2022 |
| Design Work Studios Ltd | Professional & scientific | 2015 |
| Designed in Oak Limited | Construction | 2020 |
| Devon Bramble Ltd | Real estate | 2021 |
| DG Drainage Services Ltd | Other services | 2022 |
| DGH Sport Limited | Professional & scientific | 2014 |
| DGS Secure Ltd | Administrative & support | 2018 |
| DH Data Ltd | Information & communication | 2026 |
| Dharmasiri Medical Services Ltd | Health & social care | 2025 |
| Diamond Flash Limited | Administrative & support | 2022 |
| Digipack Ltd | Professional & scientific | 2025 |
| Digitally Baffled Ltd | Information & communication | 2026 |
| Digitize Marketing Ltd | Professional & scientific | 2021 |
| Dinosaur Digital Ltd | Information & communication | 2021 |
| Discus Management Limited | Professional & scientific | 2002 |
| Displayer (City of London and Wessex) Limited | Professional & scientific | 2002 |
| Diverse Educators Ltd | Education | 2020 |
| Divine Doggies Ltd | Other services | 2024 |
| Djado Gold PLC | Financial services | 2021 |
| Dlbs Estates Ltd | Real estate | 2025 |
| DLC Lighting Limited | Other services | 2014 |
| DLX Consulting Limited | Professional & scientific | 2022 |
| DLX Europe Ltd | Wholesale & retail | 2016 |
| DMC Industrial Doors Ltd | Construction | 2026 |
| DMG & SON LLP | | 2023 |
| DO IT Services Ltd | Information & communication | 2017 |
| Dolloways Hardware Limited | Real estate | 1986 |
| Domera Developments Ltd | Real estate | 2026 |
| Donaldson Ross Limited | Extraterritorial | 2004 |
| Dora Green Educational Trust Ltd | Education | 1966 |
| Dorset Accounting Solutions Ltd | Professional & scientific | 2017 |
| Dorset Auto Diagnostics Limited | Wholesale & retail | 2020 |
| Dorset Auto Spares Holdings Limited | Professional & scientific | 2006 |
| Dorset Orthopaedic Company Limited | Health & social care | 1989 |
| Dosdos Design Ltd | Professional & scientific | 2022 |
| Double B Properties Limited | Construction | 2024 |
| Doughty Engineering Limited | Manufacturing | 1970 |
| Douglas Mews Management Company Limited | Households | 1992 |
| Dovetail Recruitment Limited | Administrative & support | 2008 |
| Downer Corporation Ltd | Financial services | 2023 |
| Downton Village Homes Limited | Construction | 1991 |
| Dpfin Limited | Financial services | 2024 |
| DR Healy Limited | Health & social care | 2013 |
| DR Helen and DR Lexi Medical Services Ltd | Health & social care | 2025 |
| DR Helen EVE Evans-Howells Limited | Health & social care | 2017 |
| DR Hugh Cummin Limited | Health & social care | 2017 |
| DR Julie Smith Ltd | Health & social care | 2020 |
| Drain Division Ltd | Other services | 2018 |
| Drainline Services Limited | Construction | 2010 |
| Drew Grange Management Limited | Households | 2001 |
| Drifters Elizabeth Ltd | Manufacturing | 2018 |
| Drrajchahal Ltd | Health & social care | 2026 |
| DRW Carpentry Ltd | Manufacturing | 2026 |
| DS Corp Limited | Wholesale & retail | 2004 |
| Dsfx Metal Work Ltd | Manufacturing | 2016 |
| DSR Media Ltd | Information & communication | 2023 |
| Dudsway Court (Ferndown) Management Company Limited | Households | 1988 |
| DWM Solutions Limited | Administrative & support | 2022 |
| DWM Technical Solutions Limited | Information & communication | 2000 |
| Dynevor Properties Limited | Real estate | 2012 |
| E J H Logistics Limited | Other services | 2021 |
| E Mccarthy Construction Limited | Construction | 2023 |
| E S Clifford Ltd | Professional & scientific | 2018 |
| E Wallis Partnership LLP | | 2022 |
| E&H Cleaning Ltd | Administrative & support | 2015 |
| Eagle Access Platforms Ltd. | Construction | 2003 |
| Eagles Crest (Poole) Limited | Households | 2004 |
| Ealco Limited | Real estate | 2020 |
| Earl Hopper Limited | Health & social care | 1978 |
| Earlsgate Properties Limited | Construction | 2015 |
| Earth Mobile Ltd | Wholesale & retail | 2025 |
| Earth Photography Ltd | Professional & scientific | 2019 |
| Earth Reforestation Ltd | Information & communication | 2025 |
| Earth Telecom Group Ltd | Information & communication | 2025 |