| Dover Specsavers Limited | Wholesale & retail | 1994 |
| Dover Visionplus Limited | Wholesale & retail | 1994 |
| Doves Developments Ltd | Construction | 2015 |
| Dowling Carpentry and Construction Limited | Construction | 2018 |
| Dowling Homes Limited | Real estate | 2020 |
| Down Park Surveys Ltd | Professional & scientific | 2024 |
| Downend Properties Limited | Real estate | 2021 |
| Downham Court (Reading) Limited | Real estate | 1973 |
| DP Aircraft UK Limited | Administrative & support | 2015 |
| DPB Estates Ltd | Real estate | 2026 |
| DPB Homes Ltd | Construction | 2011 |
| DPM Lettings Ltd | Hospitality | 2025 |
| DR Ambroze Dorina Limited | Health & social care | 2018 |
| DR Computing Limited | Education | 2016 |
| DR Diaz Ltd | Health & social care | 2025 |
| DR Giovanni Antonio Cocco Neurology Consulting Ltd | Health & social care | 2024 |
| DR J D Richards Medical Services Ltd | Health & social care | 2014 |
| DR MIN Medical Services Ltd | Health & social care | 2025 |
| DR S Tang Ltd | Health & social care | 2026 |
| DR Sanjay Gupta Limited | Health & social care | 2010 |
| Draco GAS & Heating Limited | Construction | 2021 |
| Dragon 95 Limited | Hospitality | 2019 |
| Dragon Computer Remarketing Limited | Information & communication | 1996 |
| Dragon Cycles Limited | Wholesale & retail | 2019 |
| Dragonic Limited | Information & communication | 2000 |
| Drawing Board Services Ltd | Professional & scientific | 2019 |
| Drayton MOT Centre Limited | Wholesale & retail | 2013 |
| Drbo Limited | Professional & scientific | 2022 |
| Dream Celebrations Ltd | Hospitality | 2026 |
| Dream Drop Competitions Ltd | Wholesale & retail | 2026 |
| Dream Rooms Limited | Wholesale & retail | 2002 |
| Dreamwork Consulting Ltd | Information & communication | 2019 |
| Drew Furniture Limited | Manufacturing | 2019 |
| Drews Engraving and Signs Limited | Manufacturing | 2025 |
| DRG Caledonian Ltd | Financial services | 2025 |
| DRH Construction Solutions Ltd | Construction | 2019 |
| Driffield Specsavers Limited | Wholesale & retail | 2003 |
| Drifted Records Ltd | Arts & recreation | 2021 |
| Drillmate Ltd | Manufacturing | 2026 |
| Drivers Limited | Administrative & support | 1983 |
| Droitwich Specsavers Limited | Wholesale & retail | 2006 |
| Droitwich Visionplus Limited | Wholesale & retail | 2006 |
| Drone FX Ltd | Transport & logistics | 2020 |
| Drove LEA Farm Limited | Hospitality | 2011 |
| Drums the Word Limited | Education | 2019 |
| Drury Design & Development Limited | Professional & scientific | 2023 |
| Dryv-Ai Ltd | Information & communication | 2024 |
| DS Airport Taxi Ltd. | Transport & logistics | 2019 |
| DS Double Glazing Ltd | Construction | 2022 |
| DS Mechanical (Hampshire) Ltd | Construction | 2019 |
| Dsb's Limited | Construction | 2001 |
| DSC Fabrication and Welding Ltd | Manufacturing | 2019 |
| Dsecsoft Ltd | Information & communication | 2008 |
| Dsmtrading Ltd | Financial services | 2026 |
| Dsrmd Education Ltd | Professional & scientific | 2019 |
| DST 2016 Ltd | Transport & logistics | 2025 |
| DTC Engineering & Plant Services Limited | Manufacturing | 2026 |
| DTL Decorating Services Ltd | Construction | 2023 |
| DTL Multi Services Ltd | Construction | 2022 |
| DTM Building Surveys Ltd | Professional & scientific | 2024 |
| Duco Technology Holding Limited | Financial services | 2021 |
| Duco Technology Midco Limited | Financial services | 2021 |
| Duco Technology Topco Limited | Financial services | 2021 |
| Dudley Specsavers Hearcare Limited | Wholesale & retail | 2018 |
| Dujon Exotic Plants Limited | Wholesale & retail | 2025 |
| Dumbarton Specsavers Limited | Wholesale & retail | 2003 |
| Dumfries Specsavers Hearcare Limited | Wholesale & retail | 2024 |
| Dumfries Specsavers Limited | Wholesale & retail | 1995 |
| Dumfries Visionplus Limited | Wholesale & retail | 1995 |
| Duncan Hamilton & Co Limited | Wholesale & retail | 1960 |
| Dundee Domiciliary Specsavers Limited | Wholesale & retail | 2015 |
| Dundee Specsavers Hearcare Limited | Wholesale & retail | 2013 |
| Dundee Specsavers Limited | Wholesale & retail | 1991 |
| Dundee Visionplus Limited | Wholesale & retail | 1995 |
| Dunfermline Specsavers Hearcare Limited | Wholesale & retail | 2017 |
| Dunfermline Specsavers Limited | Wholesale & retail | 1990 |
| Dunfermline Visionplus Limited | Wholesale & retail | 1993 |
| Dunley Estate Limited | Agriculture & fishing | 1949 |
| Dunlop Aviation Ltd | Professional & scientific | 2017 |
| Dunlop Plumbing, Heating & GAS Services Ltd. | Construction | 2007 |
| Dunstable Specsavers Hearcare Limited | Wholesale & retail | 2025 |
| Dunstable Visionplus Limited | Wholesale & retail | 1990 |
| Dunstable White Lion Specsavers Limited | Wholesale & retail | 2017 |
| Dunwind Property Ltd | Real estate | 2020 |
| Duracoat Roofing and Waterproofing Limited | Construction | 2022 |
| Durford Wood Landowners Limited | Households | 1933 |
| Dutch Flower Parade Ltd | Wholesale & retail | 2024 |
| Duviner Limited | Real estate | 1986 |
| Duwel UK Ltd | Wholesale & retail | 2014 |
| DV8 IT Limited | Administrative & support | 2008 |
| DVM Services Limited | Professional & scientific | 1999 |
| DW Carpets and Flooring Limited | Construction | 2026 |
| DW I.T Services Ltd | Information & communication | 2025 |
| DW Wheels and Tyres Limited | Other services | 2019 |
| DWC1956 Ltd | Professional & scientific | 2018 |
| Dwojtas Limited | Transport & logistics | 2016 |
| Dwrf Limited | Information & communication | 2019 |
| Dylan's Ice Cream Limited | Administrative & support | 2014 |
| Dynamic Aircraft Maintenance Ltd | Manufacturing | 2018 |
| Dynamic Manufacturing Solutions Limited | Professional & scientific | 2004 |