| Dnawellbeing Ltd | Health & social care | 2019 |
| DNK Preloved Ltd | Wholesale & retail | 2011 |
| DNU Connect Ltd | Construction | 2024 |
| Dockside Drinks Co Ltd | Wholesale & retail | 2021 |
| Docmandu Limited | Health & social care | 2014 |
| Docs Solutions Limited | Administrative & support | 2018 |
| Doctor Nadia Soliman Limited | Health & social care | 2014 |
| Doctor PC Limited | Information & communication | 2004 |
| Dodgsons of Dorchester Limited | Wholesale & retail | 2002 |
| Dodhill Green Limited | Hospitality | 2022 |
| Dog Rose Diaries Ltd | Education | 2020 |
| Dogalyir Ltd | Information & communication | 2022 |
| Dogsmartgroup Ltd | Wholesale & retail | 2026 |
| Doing IT for the Kids Ltd | Information & communication | 2019 |
| Dollars Savings Ltd | Administrative & support | 2020 |
| Dolphin Carpentry Limited | Construction | 2020 |
| Dolphin Couriers Limited | Transport & logistics | 2015 |
| Dolphin Dental Equipment Services Ltd | Manufacturing | 2012 |
| Dolphin Developments (Poole) Limited | Real estate | 1994 |
| Dolphin Fences & Gardens Ltd | Administrative & support | 2026 |
| Dolphin Homes(Poole) Limited | Construction | 2004 |
| Dolphin Marine Holdings Ltd | Financial services | 2025 |
| Dolphin Marine UK Limited | Manufacturing | 2004 |
| Dolphin Nails Limited | Other services | 2024 |
| Dolphin Quays (2009) Limited | Real estate | 2008 |
| Dolphin Towbars and Trailers Limited | Wholesale & retail | 2013 |
| Dolphin Trailers Limited | Wholesale & retail | 2012 |
| Dolphin Valeting Ltd | Transport & logistics | 2014 |
| Dolphin Wealth Management Limited | Financial services | 2007 |
| Domapol Ltd | Other services | 2021 |
| Dominikacare Limited | Health & social care | 2019 |
| Domlark Ltd | Construction | 2022 |
| Domp Marine Limited | Manufacturing | 2025 |
| Domunica Ltd | Real estate | 2025 |
| DON Fabio Cigars UK Limited | Wholesale & retail | 2026 |
| DON Shead Limited | Extraterritorial | 1982 |
| Dont Hump IT Pump IT Concrete Limited | Extraterritorial | 2012 |
| Dooply Technologies Limited | Information & communication | 2020 |
| Doorstopper Ltd | Professional & scientific | 2016 |
| Dopson Developments Ltd | Manufacturing | 2024 |
| Dorchester Brewery Management Company Limited | Households | 2025 |
| Dorchester Bricklaying Guild Limited | Construction | 2007 |
| Doriston Court Management Company Limited | Households | 1973 |
| Dorms & Digs Ltd | Manufacturing | 2024 |
| Doros BS Properties Limited | Real estate | 2022 |
| Doros DOC Properties Limited | Real estate | 2022 |
| Doros Holdings UK Limited | Professional & scientific | 2021 |
| Doros Marine Limited | Transport & logistics | 2022 |
| Dorsal FIN Books Ltd | Information & communication | 2026 |
| Dorset & Hampshire Cat Flap Installers Limited | Extraterritorial | 2021 |
| Dorset Airport Cabs Limited | Transport & logistics | 2025 |
| Dorset ALL Walls Ltd | Construction | 2024 |
| Dorset and Wight Ltd | Professional & scientific | 2023 |
| Dorset Artificial Grass Ltd | Construction | 2019 |
| Dorset Autocentre Limited | Wholesale & retail | 2018 |
| Dorset Blasting and Hot Zinc Coating Limited | Manufacturing | 2023 |
| Dorset Blind Association | Administrative & support | 2010 |
| Dorset Boat Recycling CIC | Manufacturing | 2026 |
| Dorset Booze Limited | Wholesale & retail | 2012 |
| Dorset Building & Landscaping Ltd | Construction | 2021 |
| Dorset Business Awards Limited | Other services | 2006 |
| Dorset Car Leasing Limited | Financial services | 2006 |
| Dorset Cardiologist Limited | Health & social care | 2015 |
| Dorset Care Association Ltd | Other services | 2023 |
| Dorset Care Homes Association Limited | Other services | 2012 |
| Dorset Carpet and Flooring Ltd | Wholesale & retail | 2026 |
| Dorset Chamber of Commerce and Industry | Other services | 1952 |
| Dorset Co-Hosting Services Ltd | Hospitality | 2023 |
| Dorset Coastal Holidays Ltd | Hospitality | 2023 |
| Dorset Coastal Property Management Ltd | Hospitality | 2026 |
| Dorset Coin Company Limited(The) | Wholesale & retail | 1980 |
| Dorset Community Foundation | Administrative & support | 2006 |
| Dorset Community Radio Ltd | Information & communication | 2006 |
| Dorset Companions Limited | Health & social care | 2019 |
| Dorset Concrete Pumping Ltd | Extraterritorial | 2018 |
| Dorset County Football Association Limited | Arts & recreation | 1999 |
| Dorset Creative Ltd | Information & communication | 2025 |
| Dorset Crew Limited | Administrative & support | 2008 |
| Dorset Cuts Limited | Other services | 2026 |
| Dorset D and J Ltd | Manufacturing | 2025 |
| Dorset Dance Centre Ltd | Education | 2022 |
| Dorset Dental Implants Limited | Health & social care | 2017 |
| Dorset Dinners Ltd | Hospitality | 2025 |
| Dorset Diving Services Ltd | Arts & recreation | 2020 |
| Dorset DPC Ltd | Construction | 2023 |
| Dorset Drainage and Plumbing Emergency Service Ltd | Construction | 2025 |
| Dorset DRY Lining Limited | Construction | 2015 |
| Dorset Drylining Holdings Limited | Financial services | 2021 |
| Dorset Eco Lettings Limited | Real estate | 2023 |
| Dorset Electrical Contractors Limited | Construction | 2007 |
| Dorset EMC Ltd | Administrative & support | 2025 |
| Dorset EV Chargers Ltd | Construction | 2021 |
| Dorset EYE Care Ltd | Health & social care | 2019 |
| Dorset Fertility Ltd | Health & social care | 2012 |
| Dorset Flowscapes CIC | Other services | 2026 |
| Dorset Forces Community Network C.I.C. | Information & communication | 2026 |
| Dorset Framers Limited | Wholesale & retail | 2014 |
| Dorset Fryer Limited | Hospitality | 2017 |
| Dorset Garden Rooms Limited | Construction | 2018 |
| Dorset Ginger Company Limited | Manufacturing | 2017 |