| DC Kitchens Limited | Wholesale & retail | 2011 |
| Ddbi Sprint Design Limited | Manufacturing | 2019 |
| Ddfl Solutions Ltd | Professional & scientific | 2015 |
| Debussie Limited | Wholesale & retail | 2014 |
| Deca Hub Ltd | Wholesale & retail | 2019 |
| Deepest Darkest Limited | Information & communication | 2025 |
| Deeplogic Consulting Ltd | Information & communication | 2025 |
| Deepsearesin Ltd | Wholesale & retail | 2024 |
| Deheers Warehouse Limited | Households | 2020 |
| Dekoda Arts Ltd | Arts & recreation | 2024 |
| Deliciae Property Ltd | Real estate | 2024 |
| Delicious Trading Ltd | Wholesale & retail | 2015 |
| Demolition Capital Ltd | Construction | 2021 |
| Denbigh 1236 Ltd | Professional & scientific | 2017 |
| Denham Group Ltd | Financial services | 2024 |
| Denham Holdings LLP | | 2024 |
| Denmark Street Wakefield Freehold 57 Ltd | Real estate | 2026 |
| Denmark Street Wakefield Leasehold 57 Ltd | Real estate | 2026 |
| Denovo by Sadaf Limited | Health & social care | 2025 |
| Dentacris Limited | Health & social care | 2013 |
| Dentis Limited | Health & social care | 2010 |
| Design Engineer Productions Ltd | Professional & scientific | 2009 |
| Design for Life Systems Limited | Professional & scientific | 2005 |
| Designa KBB Limited | Wholesale & retail | 2024 |
| Designa of Weymouth Limited | Wholesale & retail | 2017 |
| Designstack Ltd | Professional & scientific | 2021 |
| Developing Space Limited | Construction | 2015 |
| Devine Coaching Limited | Health & social care | 2014 |
| DG 57 Properties Hull Ltd | Real estate | 2022 |
| DG ILS Solutions Ltd | Professional & scientific | 2017 |
| DH Ropes & Rigging Ltd | Arts & recreation | 2025 |
| Dhesi Express Limited | Wholesale & retail | 2008 |
| Diagnosing Solutions Ltd | Professional & scientific | 2019 |
| Diamond LAB 2021 Limited | Manufacturing | 2026 |
| Digitax Ltd | Professional & scientific | 2016 |
| Dingoes (UK) Limited | Wholesale & retail | 2011 |
| Dingoes South Limited | Wholesale & retail | 2016 |
| Dionic Energy Ltd | Wholesale & retail | 2014 |
| Direct Maintenance Dorset Ltd | Administrative & support | 2015 |
| Direct Marketing Solutions Limited | Real estate | 1996 |
| Direct Moves Estate Agents Dorset Ltd | Extraterritorial | 2017 |
| Direct Moves Estate Agents LLP | | 2001 |
| Direct Moves Estate Agents Ltd | Real estate | 1997 |
| Direct Removals & Storage of Weymouth Ltd | Transport & logistics | 2003 |
| Direct Ride Ltd | Transport & logistics | 2026 |
| Discountscooters.Co.Uk Limited | Wholesale & retail | 2000 |
| Discover Your Pulse Ltd | Information & communication | 2026 |
| Discovery Building and Landscaping (Southern) Limited | Construction | 2025 |
| Discovery Building and Landscaping Limited | Construction | 2024 |
| Disgraceful Magazine Limited | Information & communication | 2021 |
| Divine INK Tattoos Limited | Other services | 2022 |
| Divona Limited | Real estate | 2015 |
| DJA Dorset Limited | Wholesale & retail | 2016 |
| DJL Motors Ltd | Wholesale & retail | 2019 |
| DK Practice & LAB Limited | Health & social care | 2023 |
| Dkbautomotive Limited | Wholesale & retail | 2024 |
| Dkea Ltd | Real estate | 2025 |
| DLO Best CUT Ltd | Other services | 2025 |
| DMC (WEY) Limited | Construction | 2026 |
| DMR Networks Ltd | Wholesale & retail | 2012 |
| DNO Maintenance Ltd | Administrative & support | 2024 |
| DOI Chaang Coffee Company UK Limited | Extraterritorial | 2011 |
| Dolphin Walk Limited | Households | 1964 |
| Dolphin-Design 2012 Limited | Manufacturing | 2012 |
| Dolway Limited | Extraterritorial | 2013 |
| Domestic Appliance Repair Ltd | Other services | 2015 |
| Domestic Sprinklers Hampshire Limited | Public administration | 2013 |
| Domestic Sprinklers Oxfordshire Limited | Construction | 2013 |
| Domestic Sprinklers West Sussex Limited | Public administration | 2013 |
| Dominie Limited | Real estate | 1991 |
| Dooritalia Limited | Wholesale & retail | 2021 |
| Doran Pubs (London) Ltd | Hospitality | 2019 |
| Dorchester Aesthetic Centre Limited | Other services | 2015 |
| Dorchester Barbers Limited | Other services | 2013 |
| Dorchester Build & Maintenance Company Limited | Extraterritorial | 2005 |
| Dorchester Curiosity Centre Limited | Wholesale & retail | 2011 |
| Dorchester Curiosity Centre Trading Limited | Wholesale & retail | 2015 |
| Dorchester Framing Limited | Other services | 2022 |
| Dorchester Plumbing Supplies Limited | Wholesale & retail | 2004 |
| Dorchester Scaffolding Services Limited | Construction | 2017 |
| Dorchester Travel Agency Limited | Real estate | 1972 |
| Dorchester Vineyard Limited | Manufacturing | 2012 |
| Dormanco Limited | Households | 1991 |
| Dorset & Devon Fire Solutions South West Ltd | Public administration | 2015 |
| Dorset & Hampshire Properties Limited | Real estate | 2020 |
| Dorset Accountancy Ltd | Professional & scientific | 2009 |
| Dorset Auto Restore Ltd | Wholesale & retail | 2021 |
| Dorset Barbers Ltd | Other services | 2019 |
| Dorset Build & Maintenance Company Limited | Construction | 1998 |
| Dorset Build and Pave Limited | Construction | 2008 |
| Dorset Build Team Limited | Construction | 2019 |
| Dorset Building & Renovation Services Limited | Construction | 2020 |
| Dorset Child and Educational Psychology Limited | Education | 2024 |
| Dorset Cleaning Services Limited | Administrative & support | 2012 |
| Dorset Coastal Estates Limited | Real estate | 2016 |
| Dorset Coastal Properties Limited | Real estate | 2005 |
| Dorset Communications & Taxi Meters Limited | Transport & logistics | 2007 |
| Dorset Composites Ltd | Manufacturing | 2025 |
| Dorset Cottage Holiday (UK) Limited | Real estate | 2014 |
| Dorset Craft Construction Limited | Construction | 2004 |