| DB Terra Limited | Construction | 2015 |
| DB Testing Services Ltd | Real estate | 2018 |
| DBB Sports Ltd | Arts & recreation | 2025 |
| Dbmg Investments Ltd | Wholesale & retail | 2023 |
| DC Drainage Company Limited | Water & waste | 2020 |
| DC Security & Electrical Services Ltd | Construction | 2002 |
| DCH Technology Services Ltd | Information & communication | 2012 |
| DCM Design Limited | Construction | 2018 |
| Dcmq Consult Ltd | Households | 2025 |
| DCS Accountancy Limited | Extraterritorial | 2026 |
| DCS Building Services (Bmth) Ltd | Construction | 2019 |
| DCS Carpentry Limited | Construction | 2019 |
| DCS Dorset Cars Sales Ltd | Wholesale & retail | 2022 |
| DCW Solutions Limited | Professional & scientific | 2016 |
| DD Allen Ltd | Arts & recreation | 2018 |
| DDD Triple Ltd | Wholesale & retail | 2021 |
| DDS Marketing Limited | Professional & scientific | 2017 |
| Ddsr Properties Ltd | Construction | 2015 |
| DDT Recruitment Limited | Administrative & support | 2016 |
| DE Castro Ltd | Professional & scientific | 2019 |
| DE Gresley Management Company Limited | Households | 1995 |
| DE Havilland Associates Limited | Administrative & support | 2007 |
| DE Havilland House (Mudeford) Ltd | Households | 2007 |
| DE Mauley Court Management Limited | Households | 2002 |
| DE Souza Dojo Limited | Real estate | 2012 |
| DE Weymarn Performance Ltd | Health & social care | 2024 |
| De-De Solutions Ltd | Wholesale & retail | 2025 |
| Dead Distribution Limited | Wholesale & retail | 2022 |
| Dead Rabbits Theatre | Arts & recreation | 2018 |
| Dead Tasty Toasties Ltd | Hospitality | 2025 |
| Deaks Trade Limited | Wholesale & retail | 2025 |
| Dealstance Property Management Limited | Households | 1995 |
| Dean Park Grange Management Company Limited | Households | 2006 |
| Dean Park Lodge Management Company Limited | Real estate | 2005 |
| Dean Park Mansions Freehold Limited | Households | 2013 |
| Deans Design Limited | Professional & scientific | 2016 |
| Deans Management Company Limited(The) | Households | 1984 |
| Deansway Court Freehold Limited | Households | 2004 |
| Dear Laura Investment Company Limited | Financial services | 2017 |
| Deardens (Winton) Limited | Wholesale & retail | 1946 |
| Deavin Consulting Limited | Professional & scientific | 2012 |
| Debbie Weston Garden Services Ltd | Administrative & support | 2019 |
| Debesis Ltd. | Administrative & support | 2015 |
| Debs & Daughters Ltd | Households | 2025 |
| DEC the Halls Limited | Wholesale & retail | 2010 |
| Decade Consultancy Ltd | Professional & scientific | 2023 |
| Decalex Digital Ltd | Information & communication | 2023 |
| Decent Digital Ltd | Information & communication | 2019 |
| Decent Dynamix Limited | Information & communication | 2020 |
| Dechocie Property Surveys Ltd | Professional & scientific | 2026 |
| Declic Textiles Ltd | Manufacturing | 2024 |
| Declutter My Space Dorset Limited | Administrative & support | 2024 |
| Deco Housing UK Ltd | Real estate | 2025 |
| Decodence Freehold Reversion Ltd | Households | 2005 |
| Decomatic (U.K) Limited | Hospitality | 1971 |
| Decoration & More Ltd | Construction | 2025 |
| Decorative Treatments Limited | Construction | 2010 |
| Decordence Ltd | Construction | 2020 |
| Decoversion Ltd | Construction | 2014 |
| Decreasing Carbon Solutions Ltd | Professional & scientific | 2022 |
| DEE One Logistics Ltd | Transport & logistics | 2026 |
| DEE Technologies Limited | Other services | 2009 |
| Deea & Sarah Ltd | Hospitality | 2021 |
| Deeagle Limited | Wholesale & retail | 2010 |
| Deeagle Tax and Accounts Limited | Professional & scientific | 2017 |
| Deep Clean With Love Ltd | Administrative & support | 2023 |
| Deepa Retails Ltd | Wholesale & retail | 2024 |
| Deepblue Aero Solutions Ltd | Manufacturing | 2021 |
| Deerleap Ltd | Real estate | 2020 |
| DEF Star Enterprises Ltd | Wholesale & retail | 2022 |
| Definitive Aerospace Solutions Ltd | Wholesale & retail | 2019 |
| Degraded.Store Ltd | Wholesale & retail | 2023 |
| Dektron Limited | Information & communication | 1989 |
| DEL Marco Coffee Limited | Hospitality | 2016 |
| DEL1 Limited | Extraterritorial | 2025 |
| Delahunty Property Management Limited | Real estate | 2020 |
| Delcaballero Limited | Financial services | 2008 |
| Delhi Group Limited | Other services | 2018 |
| Deliciously Ella Ltd. | Information & communication | 2013 |
| Delight Carpets and Home Ltd | Wholesale & retail | 2018 |
| Delirest Limited | Real estate | 2008 |
| Delirium Events Limited | Arts & recreation | 2017 |
| Delisle Beauty Clinic Limited | Other services | 2021 |
| Delivery UK TV Ltd | Wholesale & retail | 2023 |
| Dell House Home Improvements Ltd | Construction | 2026 |
| Dellmere Freehold Limited | Households | 2000 |
| Dellton Freehold Limited | Households | 2004 |
| Dellwood Property Development Limited | Real estate | 1971 |
| Delta (Southern) Ltd | Construction | 2025 |
| Delta Mortgages Limited | Financial services | 2019 |
| Deltaviate Limited | Manufacturing | 2025 |
| Deltic Services Ltd | Professional & scientific | 2009 |
| Delton House RTM Company Limited | Households | 2020 |
| Delucio Consulting Limited | Professional & scientific | 2018 |
| Demand-Centre.Com Limited | Professional & scientific | 2016 |
| Demark Lodge RTM Company Limited | Hospitality | 2012 |
| Demircan Ltd | Wholesale & retail | 2024 |
| Demob Locksmith's Limited | Construction | 2015 |
| Demonvgn Ltd | Wholesale & retail | 2023 |
| Demurtas Business Services Limited | Professional & scientific | 2023 |