| Discobolus Analytics Ltd | Information & communication | 2024 |
| Discovery Fine Chemicals Limited | Wholesale & retail | 2006 |
| Discovery Life Sciences Estates Ltd | Real estate | 2026 |
| Discovery Life Sciences International Limited | Financial services | 2025 |
| Discworld Emporium Limited | Wholesale & retail | 2015 |
| Disseminate Consulting Limited | Information & communication | 2017 |
| DIT Legal Limited | Information & communication | 2024 |
| Dival Investments Ltd | Real estate | 2025 |
| Diversity DEN Sensory Play CIC | Hospitality | 2026 |
| Dixon Scaffolding & Security Limited | Construction | 2018 |
| DJA Contracting Ltd | Information & communication | 2024 |
| DJR Consultants Ltd | Professional & scientific | 2015 |
| DJR Finance Limited | Financial services | 2017 |
| DJR Performance Limited | Professional & scientific | 2024 |
| DK Procurement Services Limited | Information & communication | 2023 |
| DK2E Inc Ltd | Administrative & support | 2013 |
| DKE Consulting Services Limited | Professional & scientific | 2024 |
| DLC Global Limited | Real estate | 2021 |
| DM Management Consulting Ltd | Professional & scientific | 2025 |
| DM P3M Limited | Professional & scientific | 2020 |
| DMA Property Solutions Ltd | Construction | 2011 |
| DMA Strategy Consulting Ltd | Information & communication | 2015 |
| Dmark Concepts Ltd | Manufacturing | 2021 |
| DMC Limited | Professional & scientific | 1984 |
| DMR Horseboxes Ltd | Manufacturing | 2025 |
| Dmsautomotive (Europe) Limited | Wholesale & retail | 2008 |
| Dmwa Limited | Professional & scientific | 2013 |
| DMY Investments Ltd | Real estate | 2019 |
| DNA Glazing Ltd | Construction | 2025 |
| DNA Treasury Limited | Administrative & support | 2014 |
| Docendo Discimus Finance Limited | Professional & scientific | 2020 |
| Doddy Design Ltd | Professional & scientific | 2024 |
| Dog Director Limited | Wholesale & retail | 2018 |
| Dognetik Limited | Manufacturing | 2019 |
| Dolan Talukdar Limited | Professional & scientific | 2025 |
| Domenico M Basiletti Ltd | Administrative & support | 2007 |
| Domestec Home Appliance Ltd | Wholesale & retail | 2024 |
| Dominey Contractors Limited | Construction | 2006 |
| Donlon Strategies Ltd | Information & communication | 2018 |
| Donsimply Limited | Information & communication | 2024 |
| Doolittle Software Limited | Information & communication | 2025 |
| Door 2 PAW Southbourne Ltd | Wholesale & retail | 2024 |
| Door 2 PAW Winton Ltd | Wholesale & retail | 2024 |
| Door Safety Solutions Ltd | Manufacturing | 2025 |
| Doors Direct (SW) Ltd | Wholesale & retail | 2023 |
| Doors of Distinction Ltd | Wholesale & retail | 1998 |
| Doortech Safety Solutions Ltd | Wholesale & retail | 2017 |
| Dorset Aggregates Limited | Extraterritorial | 2016 |
| Dorset Architects Ltd | Professional & scientific | 2022 |
| Dorset Blends Limited | Wholesale & retail | 2022 |
| Dorset Carports Ltd | Construction | 2021 |
| Dorset Cleaning Solutions (DCS) Limited | Administrative & support | 2016 |
| Dorset Consulting Ltd | Information & communication | 2023 |
| Dorset Development Company J and R Ltd | Construction | 2021 |
| Dorset Digital Print Limited | Manufacturing | 2013 |
| Dorset Doors Limited | Manufacturing | 2003 |
| Dorset Drainage Services (UK) Ltd | Water & waste | 2008 |
| Dorset Driveways Ltd | Construction | 2017 |
| Dorset Equality Group Limited | Education | 2024 |
| Dorset Farm Butchers Limited | Wholesale & retail | 2025 |
| Dorset Forge & Fabrication Ltd | Manufacturing | 2013 |
| Dorset GAS and Heating Limited | Construction | 2017 |
| Dorset Gundogs Ltd | Education | 2023 |
| Dorset Herbs & Essences Farm Limited | Agriculture & fishing | 2017 |
| Dorset Holdings Ltd | Professional & scientific | 2018 |
| Dorset Home Innovations Limited | Construction | 2022 |
| Dorset House FIX Ltd | Construction | 2026 |
| Dorset LEV Ltd | Professional & scientific | 2026 |
| Dorset Master Thatchers Ltd | Construction | 2020 |
| Dorset Organics Ltd | Administrative & support | 2019 |
| Dorset Pain Clinic Ltd | Health & social care | 2012 |
| Dorset Plant Co. Limited | Agriculture & fishing | 2008 |
| Dorset Plastics Limited | Financial services | 2012 |
| Dorset PUB Company Limited | Hospitality | 2006 |
| Dorset Sheds Limited | Manufacturing | 2010 |
| Dorset Sheet Metal Products Limited | Manufacturing | 1984 |
| Dorset Skips Limited | Extraterritorial | 2009 |
| Dorset Snails Limited | Agriculture & fishing | 2012 |
| Dorset Soils & Aggregates Limited | Wholesale & retail | 2002 |
| Dorset Soils Limited | Extraterritorial | 2016 |
| Dorset Solar Solutions Ltd | Construction | 2022 |
| Dorset Sports Cars Group Ltd | Financial services | 2006 |
| Dorset Sports Cars Ltd | Wholesale & retail | 2017 |
| Dorset Street (Blandford Forum) Management Company Limited | Extraterritorial | 1999 |
| Dorset Tea Limited | Manufacturing | 2010 |
| Dorset Tyre Services Limited | Wholesale & retail | 2013 |
| Dorset Windows Limited | Construction | 2006 |
| Dorsetborn Ltd | Arts & recreation | 2024 |
| Dots Training and Consultancy Ltd | Professional & scientific | 2026 |
| Double 11 Property Holding Ltd | Financial services | 2019 |
| Double Click Development Ltd | Information & communication | 2023 |
| Double Dragon Consulting Limited | Information & communication | 2022 |
| Double Helix Property Limited | Households | 2017 |
| Double JD Investments Ltd | Professional & scientific | 2024 |
| Double JD Properties Ltd | Real estate | 2025 |
| Douch Family Holdings Limited | Financial services | 2021 |
| Douglas Court Parkstone Limited | Administrative & support | 1989 |
| Dove Developments (Southern) Limited | Construction | 2002 |
| Doverow Solutions Limited | Information & communication | 2018 |
| Dovetail Solutions Ltd | Wholesale & retail | 2025 |