| DUHI11 Promotions Ltd | London | 2020 |
| Duif & Sprinkaan Limited | London | 2026 |
| Dujra Ltd | Farnborough | 2022 |
| Duke Fitness and Wellbeing Ltd | Edinburgh | 2023 |
| Duke of Coco Ltd | London | 2026 |
| Duke of York's Theatre Limited(The) | Woking | 1957 |
| Duke Rigging Limited | Brighton | 2021 |
| Dukebox Limited | Caversham | 2023 |
| Dukeries Motor Club Limited | Nottinghamshire | 1975 |
| Dukes Lodge (F.M.) Limited | Clevedon | 1964 |
| Dukes Norton Leisure Limited | Bath | 2000 |
| Dukes Play House Limited (the) | Lancaster | 1972 |
| Dulcie's Dance Closet Ltd | Telford | 2022 |
| Dully BOY Productions Limited | Bromsgrove | 2022 |
| Duluth Holdings Limited | London | 2017 |
| Dulwich & Sydenham Hill Golf Club Limited | London | 1957 |
| Dulwich Hamlet Football Club Limited | London | 1993 |
| Dulwich Opera Company Limited | Mildenhall | 2018 |
| Dulwich Orchestral Productions Ltd | London | 2018 |
| Dulwich Picture Gallery | London | 2016 |
| Dulwich Sports Club Limited | Burbage Road | 1971 |
| Dumark Garden Services Ltd | Cardiff | 2020 |
| Dumb Blood Limited | London | 2015 |
| Dumb Drum Limited | Bradwell, Braintree | 2008 |
| Dumbarnie Golf Links Limited | St. Andrews | 2016 |
| Dumbarton Fitness Ltd | Airdrie | 2023 |
| Dumbarton Football Club 1872 Limited | Dumbarton | 2025 |
| Dumbarton Limited | London | 2006 |
| Dumbworld Ltd | Belfast | 2007 |
| Dumbworld Productions Ltd | Holywood | 2009 |
| Dumfries & Galloway Aviation Museum | Dumfries | 2003 |
| Dumfries Knitwear Limited | Midlothian | 1920 |
| Dumfries Music Collective CIC | Dumfries | 2016 |
| Dumfries Saints C.I.C. | Dumfries | 2016 |
| Dumi Siwo Limited | Lincoln | 2021 |
| DUN Production Limited | London | 2016 |
| DUN Uladh Limited | Omagh | 1992 |
| Dunamis Productions Ltd | Watford | 2025 |
| Dunara Limited | Canterbury | 2026 |
| Dunbar Brown Limited | Horsham | 2025 |
| Dunbar Community Development and Heritage Trust | Dunbar | 1998 |
| Dunbar Golf Club Limited | Dunbar | 2014 |
| Dunbar United Football Club CIC | Dunbar | 2021 |
| Dunbar West Limited | Manchester | 2021 |
| Dunblane Digital Makerspace CIC | Dunblane | 2022 |
| Dunblane New Golf Club Ltd. (the) | Dunblane | 1923 |
| Dunblane Youth and Sports Centre Trust | Dunblane | 2002 |
| Duncan Edwards United Limited | Stourbridge | 2026 |
| Duncan Grieve Ltd | Southend-On-Sea | 2022 |
| Duncan Mackinnon Music and Arts Trust Limited | Galashiels | 2011 |
| Duncan Mccarthy Ltd | Ripon | 2022 |
| Duncan Mclean Projection Ltd | London | 2014 |
| Duncan Riley Live Ltd | Birmingham | 2026 |
| Duncan Woolger Golf Limited | Yateley | 2008 |
| Duncan Wylie Studio Ltd | London | 2026 |
| Duncombe Street Community House Limited | Milton Keynes | 2010 |
| Duncrag Ltd | Dumbarton | 2022 |
| Dundas Entertainment Limited | Oban | 2017 |
| Dundee Arena Limited | North Lanarkshire | 2021 |
| Dundee Art Company Limited | London | 2014 |
| Dundee Contemporary Arts Limited | | 1997 |
| Dundee Fives Ltd | Glasgow | 2010 |
| Dundee Gymnastics Club 2K | Dundee | 2003 |
| Dundee Makerspace Limited | Dundee | 2014 |
| Dundee Mixed Martial Arts Youth and Community Sports Association | Dundee | 2008 |
| Dundee Museum of Transport Ltd | Dundee | 2015 |
| Dundee REP and Scottish Dance Theatre Limited | Dundee | 1939 |
| Dundee Roller Derby Ltd | Dundee | 2015 |
| Dundee Rugby Club Ltd. | Dundee | 2017 |
| Dundee Soft Play & Bounce Hire Ltd | Dundee | 2025 |
| Dundee Strength Unit Ltd | Dundee | 2017 |
| Dundee Symphony Orchestra Production Ltd. | Dundee | 2025 |
| Dundee United Community Trust | Dundee | 2008 |
| Dundonald United Football Club Ltd | Woking | 2019 |
| Dundonnell Enterprises Limited | By Garve | 2022 |
| Dundrod and District Motorcycle Club Limited | Lisburn | 1989 |
| Dune Music Publishing Limited | Greenford | 1997 |
| Dunedin Concerts Trust Limited | Edinburgh | 2009 |
| Dunelmia Leisure Ltd | Durham | 2016 |
| Dunes Competitions Ltd | Fraserburgh | 2021 |
| Dunes Fitness Ltd | Grange-Over-Sands | 2026 |
| Dunfermline Athletic Football Club Limited | Dunfermline | 1921 |
| Dunfermline Carnegie Hockey Club | Dunfermline | 2023 |
| Dunfermline Golf Club Limited | Dunfermline | 2023 |
| Dunfermline Tennis and Bridge Club Limited | Dunfermline | 1966 |
| Dunfly Trustee NO 2 Ltd | Rickmansworth | 2020 |
| Dung Beetle Limited | Woodside Park | 2014 |
| Dungannon (Oaks Park) Stadium Greyhound Racing Limited | Dungannon | 1995 |
| Dungannon Cookstown Camera Club Limited | Dungannon | 2025 |
| Dungannon Motor Club, Limited | Cookstown | 1961 |
| Dungannon United Youth C.I.C. | Dungannon | 2010 |
| Dunham Forest Golf and Country Club Limited | Cheshire | 1958 |
| Dunham Greyhound Centre Ltd | Bingham | 2007 |
| Dunham on the Hill & Hapsford Community Project Ltd | Frodsham | 2007 |
| Duniaworld Active Ltd | London | 2024 |
| Dunk the Biscuit Ltd | London | 2018 |
| DUNK1 Ltd | Reigate | 2015 |
| Dunkeld Records Limited | Dunkeld | 1986 |
| Dunkeswell Kart Club Ltd | Honiton | 2023 |
| Dunlop & District Community Company | Kilmarnock | 2002 |