| Dawson Services Limited | Professional & scientific | 2016 |
| DB Carpentry and Installations Limited | Construction | 2022 |
| DC Ophthalmic Services Ltd | Health & social care | 2023 |
| DCH Subco Ltd | Wholesale & retail | 2017 |
| DDB Innovations Limited | Information & communication | 2015 |
| DE Boer & Taylor Equine Veterinary Practice LLP | | 2019 |
| DE LA Hunty Property Maintenance Limited | Real estate | 2018 |
| Dean Agriculture Ltd | Agriculture & fishing | 2026 |
| Dean Roper Architectural Services Ltd | Professional & scientific | 2021 |
| Deane Computer Solutions Limited | Information & communication | 2007 |
| Delta Events Ltd | Hospitality | 2022 |
| Delta FOX Ltd | Professional & scientific | 2020 |
| Delta Golf Business Solutions Ltd | Professional & scientific | 2026 |
| Dencher Limited | Professional & scientific | 2013 |
| Denotes Digital Ltd | Information & communication | 2013 |
| Depa H2O Services Limited | Construction | 2008 |
| Derek Salkeld Ltd | Professional & scientific | 2023 |
| Design Solutions Dorset Ltd | Real estate | 2013 |
| Destinations Unlimited Ltd | Other services | 2015 |
| Destiny Healthcare Private Ltd | Health & social care | 2013 |
| Destiny Investment Group Ltd | Hospitality | 2025 |
| Devenish House Freehold Limited | Households | 2022 |
| Devi PVT Limited | Hospitality | 2024 |
| Devon Hampers Limited | Wholesale & retail | 2014 |
| Dewey Brothers LLP | | 2023 |
| DFC Electrical Services Ltd | Manufacturing | 2016 |
| DFC Plus Ltd | Real estate | 2021 |
| DH Decorators Limited | Construction | 2003 |
| DH Heritage Flights Limited | Arts & recreation | 2012 |
| DH Surveyors Ltd | Professional & scientific | 2021 |
| Dialog Consulting Ltd | Health & social care | 2025 |
| Diamond Metals Limited | Water & waste | 2013 |
| Different Drum Consulting Limited | Professional & scientific | 2023 |
| Digby & Grae Ltd | Construction | 2020 |
| Digital Clinical Safety Consulting Limited | Information & communication | 2022 |
| Digital Marketing Enterprises Ltd | Information & communication | 2012 |
| Dilston Press Limited | Information & communication | 1997 |
| Dimbleby Partners Limited | Information & communication | 1981 |
| Diverse Supplies Limited | Wholesale & retail | 2017 |
| Dixon Enterprises Limited | Other services | 2011 |
| DJ Plant Dorset Limited | Wholesale & retail | 2017 |
| DJC Welding Limited | Manufacturing | 2023 |
| DJL Portfolio Limited | Professional & scientific | 2010 |
| DK Financial Solutions Ltd | Financial services | 2020 |
| Dksf Ltd | Real estate | 2021 |
| DLB Property Maintenance Limited | Real estate | 2023 |
| DLW Developments Ltd | Construction | 2021 |
| DMB Tour Management Ltd. | Information & communication | 2018 |
| DMC Publishing Limited | Arts & recreation | 1996 |
| Dmgaillard Building Services Ltd | Construction | 2023 |
| DML Management Limited | Professional & scientific | 2002 |
| DNA Cleaning and Door Solutions Ltd | Administrative & support | 2017 |
| DNA Commercial Cleaning and Valeting Ltd | Administrative & support | 2023 |
| DNA Holdings Collective Limited | Financial services | 2025 |
| DNA Property Innovations Limited | Construction | 2025 |
| DOD Lane Productions Limited | Information & communication | 2008 |
| Doggie Wash Limited | Other services | 2026 |
| Dolce Vita Lyndhurst Ltd | Financial services | 2018 |
| Dollyhouse Holdings Ltd | Real estate | 2017 |
| Domestic Appliance Maintenance (Dorset) Limited | Wholesale & retail | 1964 |
| Domestic Home Solutions Limited | Administrative & support | 2024 |
| Dominey's Yard Limited | Real estate | 2009 |
| Domvs (Dorchester) Limited | Real estate | 2004 |
| Domvs Holdings Limited | Financial services | 2022 |
| Domvs Holidays Limited | Hospitality | 2023 |
| Domvs Lettings Limited | Real estate | 2008 |
| Dorcastle Property Services Ltd | Real estate | 2025 |
| Dorchester Arts | Arts & recreation | 1992 |
| Dorchester Arts Trading Limited | Hospitality | 2015 |
| Dorchester Auto Body Ltd | Wholesale & retail | 2022 |
| Dorchester Barbell Casc Ltd | Arts & recreation | 2014 |
| Dorchester BID Limited | Administrative & support | 2006 |
| Dorchester Cafe & Restaurant Limited | Hospitality | 2026 |
| Dorchester Carpets Limited | Wholesale & retail | 2023 |
| Dorchester Cars Limited | Wholesale & retail | 2025 |
| Dorchester Collection Exclusive Ltd | Wholesale & retail | 2026 |
| Dorchester Collection International Ltd | Wholesale & retail | 2026 |
| Dorchester Collection Limited | Extraterritorial | 2003 |
| Dorchester Estate Agents Ltd | Real estate | 2017 |
| Dorchester Finest Foods Limited | Wholesale & retail | 2014 |
| Dorchester Foot Clinic Ltd | Health & social care | 2022 |
| Dorchester Healthcare Limited | Wholesale & retail | 2009 |
| Dorchester Lettings Limited | Real estate | 2017 |
| Dorchester Mini Centre Limited | Wholesale & retail | 2019 |
| Dorchester Opportunity Preschool Group Ltd. | Education | 2011 |
| Dorchester Print Limited | Manufacturing | 2007 |
| Dorchester Property Lettings Limited | Real estate | 2013 |
| Dorchester Property Limited | Real estate | 2021 |
| Dorchester Scaffolding Limited | Construction | 2008 |
| Dorchester Shipping Containers Limited | Transport & logistics | 2014 |
| Dorchester Show Limited | Arts & recreation | 2017 |
| Dorchester Steam Engine Preservation Society Limited | Manufacturing | 2012 |
| Dorchester Storage Limited | Transport & logistics | 2025 |
| Dorchester Surplus Limited | Wholesale & retail | 2013 |
| Dorchester Tackle and Guns Ltd | Wholesale & retail | 2015 |
| Dorchester Taxis Limited | Transport & logistics | 2020 |
| Dorchester Trustees Limited | Administrative & support | 2008 |
| Dorchester Waste Paper Limited | Water & waste | 2007 |
| Dorchester Workshop Ltd | Transport & logistics | 2025 |
| Dorchpaws Ltd | Other services | 2023 |