| Dumgo Ltd | Real estate | 2024 |
| Dunamis Infrastructure Services Limited | Construction | 2007 |
| Dunas Cleaning (Commercial) Limited | Administrative & support | 2025 |
| Dunas Cleaning (Residential) Limited | Administrative & support | 2025 |
| Dunas Cleaning Limited | Administrative & support | 2025 |
| Duncan Probate Services Ltd | Professional & scientific | 2022 |
| Duncan R Macleod Limited | Administrative & support | 2002 |
| Dunedin Services Limited | Construction | 2015 |
| Dunes Homes Ltd | Real estate | 2024 |
| Dungeoncrawler Ltd | Wholesale & retail | 2023 |
| Dungworth Accommodation Limited | Hospitality | 2003 |
| Dunhamj Ltd | Hospitality | 2026 |
| Dunk Distribution Ltd | Transport & logistics | 2020 |
| Dunleavy Property Services Ltd | Construction | 2024 |
| Dunroamin Consulting Limited | Information & communication | 2006 |
| Dunstan Developments Ltd | Construction | 2022 |
| Dunstan Steads Management Limited | Households | 2000 |
| Dunworthy Consultancy Limited | Professional & scientific | 2025 |
| Duobao Limited | Hospitality | 2024 |
| Duplexia Ltd | Construction | 2009 |
| Duraku Limited | Hospitality | 2026 |
| Durax Ltd | Administrative & support | 2017 |
| Durham Duplex Limited | Manufacturing | 1910 |
| Durham OX Sheffield Ltd | Construction | 2026 |
| Durio Zibethinus Holding Limited | Construction | 2023 |
| Durlstone Property Services Ltd | Financial services | 2021 |
| Duro Holdings Limited | Financial services | 2023 |
| Duro Limited | Professional & scientific | 2025 |
| Duro Yokota Limited | Wholesale & retail | 1992 |
| Duroc Film Ltd | Information & communication | 2022 |
| Durrans-Kimwan Power Materials Limited | Manufacturing | 2019 |
| Durridge UK Ltd. | Manufacturing | 2014 |
| Duski & Mizori Limited | Hospitality | 2024 |
| Duskweave Entertainment Limited | Information & communication | 2025 |
| Dusty Cat Consultancy Ltd | Information & communication | 2016 |
| Dutton and Redfern Ltd | Manufacturing | 2017 |
| Dutton Recruitment Limited | Administrative & support | 1985 |
| Duzgo Ltd | Wholesale & retail | 2021 |
| DV Logistics & Transport Ltd | Transport & logistics | 2015 |
| DVA Group Limited | Administrative & support | 2007 |
| DVA Private Limited | Wholesale & retail | 2025 |
| DVD Inc Limited | Information & communication | 2024 |
| DVD Inc Publishing Limited | Information & communication | 2026 |
| DVO Holdings Limited | Financial services | 2018 |
| DW Films Ltd | Wholesale & retail | 2024 |
| DW Graphics Ltd | Professional & scientific | 2024 |
| DW Joinery Solutions Ltd | Construction | 2011 |
| DW Property Ltd | Hospitality | 2022 |
| DW Pubs Ltd | Hospitality | 2022 |
| DWA Haulage Limited | Transport & logistics | 2001 |
| Dwarwickinns Ltd | Hospitality | 2025 |
| Dwight Ltd | Hospitality | 2025 |
| Dwilco Limited | Hospitality | 2023 |
| DWR Rail Consulting Ltd | Professional & scientific | 2010 |
| DWS Designer Woodwork Services Limited | Manufacturing | 2005 |
| DWS Fabrications Limited | Manufacturing | 2009 |
| DWT Global Services Ltd | Manufacturing | 2021 |
| DWV Technologies Ltd | Information & communication | 2024 |
| DWW Electrical Ltd | Construction | 2023 |
| Dwwd Ltd | Hospitality | 2023 |
| Dyam Food Ltd | Wholesale & retail | 2022 |
| DYD Global Limited | Wholesale & retail | 2025 |
| Dykes Hall Ltd | Wholesale & retail | 2017 |
| Dylan Services Limited | Construction | 2025 |
| Dylan Wilson-Wright Limited | Information & communication | 2022 |
| Dylas Property Ltd | Real estate | 2025 |
| Dymatt Ltd | Real estate | 2022 |
| Dyna-Lec Limited | Construction | 2007 |
| Dynamic (RSG) Holdings Limited | Financial services | 2022 |
| Dynamic (RSG) Investments Limited | Real estate | 2022 |
| Dynamic Broadcast and Production Ltd | Information & communication | 2023 |
| Dynamic Business Engineering Limited | Professional & scientific | 2020 |
| Dynamic Commercial Ltd | Professional & scientific | 2023 |
| Dynamic Dance CIC | Arts & recreation | 2024 |
| Dynamic Engrave & Print Ltd | Manufacturing | 2019 |
| Dynamic Glazing Systems Ltd | Construction | 2024 |
| Dynamic Improvements Limited | Other services | 2012 |
| Dynamic Industrial Heating Limited | Construction | 2024 |
| Dynamic Industrial Limited | Professional & scientific | 2022 |
| Dynamic Locum (SY) Limited | Health & social care | 2016 |
| Dynamic Performance Racing Ltd | Wholesale & retail | 2016 |
| Dynamic Performance Specialists Ltd | Real estate | 2020 |
| Dynamic Retail (SY) Limited | Transport & logistics | 2017 |
| Dynamol Engineering Limited | Professional & scientific | 2012 |
| Dynasty Spice Ltd | Hospitality | 2019 |
| Dynex Tech Limited | Manufacturing | 2017 |
| Dyslexia Accommodations Ltd | Real estate | 2023 |
| Dyson IT Ltd | Information & communication | 2008 |
| Dyson Place Limited | Construction | 1988 |
| Dyson Signs & Graphics Limited | Administrative & support | 2011 |
| Dyson TPM Ltd | Professional & scientific | 1997 |
| DZ Chicken Limited | Hospitality | 2026 |
| DZY Ltd | Real estate | 2023 |
| Díptico Ltd | Professional & scientific | 2021 |
| D’Ibrahims Ltd | Health & social care | 2022 |
| D’S Kitchen Sheff Ltd | Hospitality | 2026 |
| E & a Cladding Services Ltd | Construction | 2005 |
| E & L Hair Limited | Other services | 2016 |
| E & R Irving Fishmongers Ltd | Wholesale & retail | 2025 |
| E & S Restoration Ltd T/A Rainbow Restoration Ltd | Administrative & support | 2020 |