| DTJ Property Maintenance Limited | Bristol | 2026 |
| DTJ Renewables Limited | Newtownards | 2015 |
| Dtopvet Ltd | Warminster | 2020 |
| DTP Glassworks Limited | Farningham Road | 2018 |
| DTP Supplies Limited | Salford | 1998 |
| DTP Xtreme Ltd | Llandrindod Wells | 2014 |
| DTS Media and Marketing Ltd | Colchester | 2011 |
| Dtsys Co. Ltd | London | 2018 |
| DU Healing Point Ltd. | Haverfordwest | 2023 |
| DU Pont (U.K.) Trustees Limited | Stevenage | 1994 |
| Du-Hope International Co., Ltd | Beckenham | 2011 |
| Dualgroupsystem SLP Limited | London | 2015 |
| Duality Journals Ltd | Rugeley | 2025 |
| Dualpin Limited | Bromsgrove | 1994 |
| Dualtech Flood Doors Limited | Mansfield | 2010 |
| Duarte & Duarte Ltd | Earlsfield | 2022 |
| Duarti Ltd | Bristol | 2022 |
| Dubai Fashion & Perfume London Ltd | Southall | 2026 |
| Dubai Gold Ltd | Leeds | 2016 |
| Dubai Homes Ltd | Sheffield | 2025 |
| Dubai Limited | Bradford | 2004 |
| Dubia Limited | Harrogate | 2025 |
| Dubilea Ltd | London | 2012 |
| Dubkation Campers Ltd | Peterborough | 2019 |
| DUBL1N Ltd | Harrogate | 2021 |
| Dublcheck (Chester) Limited | Chester | 2000 |
| Dublin Murders Productions Limited | Belfast | 2018 |
| Dubrek Studios Limited | Matlock | 2021 |
| Dubstix Enterprises Ltd | Bradford On Avon | 2011 |
| Dubworks LDN Ltd | Belvedere | 2023 |
| Ducales Trading NO.10 Limited | Belfast | 2013 |
| Ducales Trading NO.11 Limited | Belfast | 2013 |
| Ducales Trading NO.12 Limited | Belfast | 2013 |
| Ducales Trading NO.13 Limited | Belfast | 2015 |
| Ducales Trading NO.14 Limited | Belfast | 2015 |
| Ducales Trading NO.15 Limited | Belfast | 2015 |
| Ducales Trading NO.16 Limited | Belfast | 2015 |
| Ducales Trading NO.17 Limited | Belfast | 2015 |
| Ducales Trading NO.18 Limited | Belfast | 2015 |
| Ducales Trading NO.19 Limited | Belfast | 2015 |
| Ducales Trading NO.20 Limited | Belfast | 2015 |
| Duchess Court Limited | London | 2004 |
| Duchy Banqueting Limited | St Austell | 2013 |
| Duchy Investment Partners Limited | Harrogate | 2023 |
| Duchy Nominees Limited | Harrogate | 2023 |
| Ducie Holdings Ltd | Dewsbury | 2025 |
| Ducie Wharf Management Company Limited | Manchester | 2002 |
| Ducis International Limited | Coventry | 2024 |
| Duck Eggs Limited | London | 2011 |
| Duckpin Limited | Hove | 2019 |
| Ducktail Creative Ltd | Colchester | 2023 |
| Duckworth Hall Properties Ltd | Blackburn | 2021 |
| Duco Developments 16 Ltd | Doncaster | 2016 |
| Duct Warehouse Limited | Billericay | 2013 |
| Ducthub Limited | Cambridge | 2018 |
| Dudd Ltd | Grantham | 2024 |
| Duddon Homefix Ltd | Askam In Furness | 2016 |
| Duddy Godlonton Limited | Lancashire | 1999 |
| Dudley Bentry Limited | Hounslow | 2024 |
| Dudley Bros Limited | Wymondham | 2017 |
| Dudley Coles Limited | Salford | 1945 |
| Dudley Factory Doors Limited | West Bromwich | 1998 |
| Dudman (Minsted) Limited | Brighton | 1998 |
| Dudman Equipment Limited | Brighton | 1998 |
| Dudman Haulage (Properties) Limited | Brighton | 1998 |
| Dudman Rail (Properties) Limited | Brighton | 1998 |
| Dudman Waste & Environmental Limited | Brighton | 1998 |
| Dudman Wharf Properties Limited | Brighton | 1989 |
| Dudrich Developments (Holdings) Limited | London | 2003 |
| Dudrich Investment (Holdings) Limited | London | 2003 |
| Due-Andresen LIV & Helse Limited | London | 2023 |
| Duel Limited | Bradford | 1984 |
| Duex Industrial Co., Ltd | Beckenham | 2016 |
| Dufex Craft Products Limited | Hitchin | 2010 |
| Duff Beer Limited | Harrogate | 2011 |
| Duffel Import and Export Trading Co., Ltd. | Beckenham | 2019 |
| Duffield Fish & Chips Limited | Hull | 2020 |
| Duffield Road Management Limited | Derby | 2016 |
| Duffin Developments Ltd | Toomebridge | 2023 |
| Duffle Fashion Co., Ltd | Cambridge | 2020 |
| Duffree Ltd | Totland Bay | 2001 |
| Duffy Management & Investments Limited | Woking | 2011 |
| Duffy Mitchell & Wells Ltd | Bellshill | 2015 |
| Duggleby's Limited | Nottingham | 2008 |
| Dugless Ltd | Redditch | 2023 |
| DUK Lothar Limited | London | 2025 |
| Duke and Honour Limited | Morley | 2010 |
| Duke Johnson Property Development Ltd | London | 2018 |
| Duke Maintenance Limited | London | 2022 |
| Duke Software Ltd | Walton-On-Thames | 2024 |
| Dukefield Investments Limited | Swansea | 1994 |
| Dukemount Capital Ltd | Godalming | 2025 |
| Duker Chemical Company Limited | Beckenham | 2018 |
| Dukes Education Group (Hong Kong) Ltd | London | 2017 |
| Dukes Medical Ltd | London | 2015 |
| Dukes Pathways Ltd | London | 2018 |
| Dukes Publishing Ltd | London | 2016 |
| Dukes Schools (Twickenham) Ltd | London | 2019 |
| Dukes Transport (Craigavon) Limited | Co Antrim | 1971 |
| Dukevale Limited | Leeds | 1995 |