| DM Social Ltd | Information & communication | 2019 |
| DMC Electrical Testing Ltd | Professional & scientific | 2022 |
| DMC Property Maintenance Limited | Real estate | 2024 |
| DMW Engineering Limited | Professional & scientific | 2024 |
| DNC Tech Labs Limited | Information & communication | 2020 |
| DNF Clothing Ltd | Wholesale & retail | 2020 |
| DNR Structural Steel Ltd | Construction | 2022 |
| Doctorate Limited | Professional & scientific | 2003 |
| Dog and Crook Ltd | Hospitality | 2014 |
| Dog-E-Dog Grooming Ltd | Other services | 2023 |
| Dogs in Need | Professional & scientific | 2003 |
| Dolly Rockers Hair Limited | Other services | 2022 |
| Dolphin Drilling Limited | Mining & quarrying | 1971 |
| Dolphin Drilling Offshore Limited | Mining & quarrying | 2020 |
| Dolton Property Limited | Real estate | 2019 |
| Domilocum Ltd | Professional & scientific | 2022 |
| Don's Doors Limited | Construction | 2012 |
| Done Right Plumbing and Property Maintenance Ltd | Construction | 2023 |
| Donna Laine Ltd | Information & communication | 2024 |
| Dont Surf Limited | Information & communication | 2005 |
| Doorsandglasses Limited | Real estate | 2025 |
| Dorset Property (Blandford) Limited | Real estate | 2010 |
| Dorset Sprinkles Ltd | Hospitality | 2018 |
| Doswell Estates Limited | Real estate | 2020 |
| Doswell Projects Limited | Construction | 2005 |
| Dot's Detailing Ltd | Wholesale & retail | 2025 |
| Dotelastic Ltd | Information & communication | 2022 |
| Dotris Ltd | Information & communication | 2023 |
| Double Tide Dynamics Ltd | Transport & logistics | 2022 |
| Doubletake Motorcycles Ltd | Wholesale & retail | 2004 |
| Dove Mobility Ltd | Health & social care | 2025 |
| Dover Fluids UK Ltd | Professional & scientific | 1988 |
| Dover Intercompany Services UK Limited | Manufacturing | 2013 |
| Dover Refrigeration & Food Equipment UK Ltd | Professional & scientific | 2002 |
| Dover UK Pensions Limited | Professional & scientific | 2012 |
| Dovey and Broom Ltd | Other services | 2019 |
| Dowse Scaffolding Ltd | Construction | 2024 |
| DP Eco-Collective Ltd | Wholesale & retail | 2026 |
| DPM Consultancy (South) Limited | Construction | 2022 |
| Dpmj Management Limited | Health & social care | 2023 |
| DR Fiala Limited | Health & social care | 2024 |
| DR Nafie Ltd | Education | 2025 |
| DR Rachael Cornish Limited | Health & social care | 2024 |
| DR7 Associates Ltd | Professional & scientific | 2025 |
| Dragonflies Childcare (Hampshire) Ltd | Health & social care | 2018 |
| Dragonfly Gardens Limited | Arts & recreation | 2004 |
| Dragonfly Warriors Limited | Administrative & support | 2014 |
| Dragonfly Wills and Estate Planning Ltd | Professional & scientific | 2023 |
| Draka Cardinal Limited | Manufacturing | 1982 |
| Draka Comteq UK Limited | Manufacturing | 2004 |
| Draka U.K. Limited | Manufacturing | 1968 |
| Draper Tool Group Limited(The) | Professional & scientific | 1978 |
| Draper Tools Limited | Wholesale & retail | 1956 |
| Dreaded Fitness Limited | Arts & recreation | 2020 |
| Dream Factory 360 Limited | Professional & scientific | 2023 |
| Dreamcraft Studios Limited | Administrative & support | 2023 |
| Dress to Go Limited | Wholesale & retail | 2005 |
| Drifix Limited | Construction | 2004 |
| Driftwood Companys Limited | Hospitality | 2025 |
| Driveam Limited | Transport & logistics | 2017 |
| Driveden Ltd | Wholesale & retail | 2010 |
| Drivers DRY Berthing Limited | Transport & logistics | 2005 |
| Drivingly School of Motoring Ltd | Education | 2024 |
| DS Insulation Ltd | Construction | 2026 |
| DS Vehicles Ltd | Wholesale & retail | 2025 |
| DSC Holdings Limited | Professional & scientific | 2016 |
| DSC Surveying Services Ltd | Professional & scientific | 2017 |
| DSS Radiology Limited | Education | 2024 |
| DTS Procurement Ltd. | Wholesale & retail | 2026 |
| DUB Media Ltd | Professional & scientific | 2025 |
| Duke Developments (Ampfield) Limited | Real estate | 2006 |
| Dunfords Garage Limited | Wholesale & retail | 2024 |
| Dunwell Landscapes & Property Maintenance Limited | Administrative & support | 2018 |
| Duporth Limited | Real estate | 2003 |
| Duraflor (UK) Limited | Construction | 2002 |
| Dusty Trails Ltd | Education | 2017 |
| Dutton Gregory LLP | | 2008 |
| Dutton Gregory Trust Corporation Limited | Administrative & support | 2023 |
| Dutton Ward Limited | Financial services | 2014 |
| Dvkc Ltd | Construction | 2019 |
| Dvpt Commercial Holdings Limited | Financial services | 2025 |
| Dvpt Group (Holdings) Ltd | Financial services | 2017 |
| Dvpt Property Holdings Ltd | Real estate | 2025 |
| DW Business Limited | Professional & scientific | 2024 |
| DW Technical Solutions Ltd | Extraterritorial | 2022 |
| Dwtudor Ltd | Financial services | 2016 |
| Dyke Properties Limited | Real estate | 2018 |
| Dyke Services Limited | Wholesale & retail | 2001 |
| Dyn-Rc Services Ltd | Construction | 2019 |
| Dynami-Therapeutics Limited | Health & social care | 2022 |
| Dynamic Aerial Academy Limited | Arts & recreation | 2022 |
| Dynamic Diamond Plus Ltd | Construction | 2021 |
| E a Heib Limited | Education | 2014 |
| E C Fenning & SON Limited | Wholesale & retail | 2016 |
| E. M. Lawson & SON Holdings Limited | Real estate | 1992 |
| E2E AI Ltd | Information & communication | 2025 |
| Eaglecoms Limited | Information & communication | 2012 |
| East Africa Safaris Limited | Extraterritorial | 2013 |
| East Anton Local Centre Management Company Limited | Households | 2016 |
| East Horton Golf Centre Limited | Hospitality | 1995 |