| Dukhan Investments Limited | Banstead | 2011 |
| Dulater Hill Wind Park Limited | Stroud | 2007 |
| Dulce Grace Ltd | Aylesbury | 2023 |
| Dulcote Limited | Shepton Mallet | 2011 |
| Dulevo UK Limited | Wakefield | 2018 |
| Dullahan Developments Ltd | London | 2024 |
| Dulverton Developments Ltd | London | 2014 |
| Dulverton Rise 1973 Limited | Pontefract | 2013 |
| Dulwich Gardens Ltd | Bromley | 2023 |
| DUM (UK) Chymistry Engineering Group Ltd | Beckenham | 2022 |
| Dumbarton Road Management Company Limited | London | 2009 |
| Dumfries Assets Limited | Manchester | 2017 |
| Dumfries Caravan Centre Limited | Dumfries | 1988 |
| Dumpaskips Limited | Dinas Powys | 2014 |
| DUN Mill Group Limited | Swindon | 2023 |
| Dunasfern Auriga Limited | Newbury | 2016 |
| Dunasfern Limited | Newbury | 1983 |
| Dunbar Investment Management Ltd | Coventry | 2013 |
| Dunbar Management Services Limited | Liversedge | 1994 |
| Duncan & Sons Electrical Ltd | Bristol | 2025 |
| Duncan Cabs Ltd. | Edinburgh | 2000 |
| Duncan Investment Properties Limited | Warrington | 2008 |
| Duncan Street 1956 Limited | Harrogate | 2014 |
| Duncan’S Tradesmen & Decorators Ltd | Bristol | 2026 |
| Duncraggan Cabin Limited | Glasgow | 2023 |
| Duncrub Holidays Limited | | 1985 |
| Dundarave Estate Holdings Limited | Crumlin | 2018 |
| Dundee & Dundee Limited | Manchester | 2021 |
| Dundee Arcadia Limited | North Lanarkshire | 2023 |
| Dundee Cake Company Ltd | Dundee | 1900 |
| Dundee Chemicals Limited | Manchester | 2004 |
| Dundee City Football Club Ltd | Dundee | 2016 |
| Dundee Crematorium Limited | Glasgow | 1975 |
| Dundrinquin Limited | Banbury | 2015 |
| Dune and Union Limited | Solihull | 2025 |
| Dunedin Autos Ltd | Coatbridge | 2014 |
| Duneight Limited | Portstewart | 2007 |
| Dunelm Estates Limited | Leicester | 2003 |
| Dunfermline Autocentre Limited | Dunfermline | 1985 |
| Dunfly Trustee Limited | Rickmansworth | 1995 |
| Dung Beetles Direct Limited | St Davids | 2013 |
| Dung HO Ltd | Birchington | 2020 |
| Dungait Investment Management Ltd | Coventry | 2014 |
| Dunglaide Limited | Birmingham | 1992 |
| Dunhams Accountants Ltd | Manchester | 2008 |
| Dunhams Audit Ltd | Manchester | 2008 |
| Dunhams Consultants Limited | Manchester | 2015 |
| Dunhams Financial Services Limited | Manchester | 2016 |
| Dunhill Classics Limited | Harrogate | 2011 |
| Dunk Property Services Limited | Attleborough | 2016 |
| Dunkertons Cider Holdings Limited | Cheltenham | 2016 |
| Dunkeswick Homes Limited | Leeds | 2004 |
| Dunkin Rushton (Ashby DE LA Zouch) Ltd | Ashby De La Zouch | 2023 |
| Dunkin Rushton (Hood House) Limited | Ashby-De-La-Zouch | 2023 |
| Dunlop Aerospace Limited | Hemel Hempstead | 1960 |
| Dunlop Aerospace Overseas Investments Limited | Hemel Hempstead | 1998 |
| Dunlop Extrusions Limited | Manchester | 2001 |
| Dunlop Heywood Limited | Camberley | 2008 |
| Dunn and Cowe Limited | Cradley Heath | 1981 |
| Dunn Enterprises Limited | Jarrow | 2021 |
| Dunn Metals Ltd | Bromsgrove | 2017 |
| Dunn Street Developments Limited | Coventry | 2013 |
| Dunning (Undertaking) Limited | Sutton Coldfield | 1989 |
| Dunning Brothers (III) Limited | Chelmsford | 2011 |
| Dunningham Decorators (Yorkshire) Limited | Sunderland | 1982 |
| Dunns (Exeter) Limited | Taunton | 1959 |
| Dunotta Limited | Stockton-On-Tees | 2006 |
| Dunrich Green Ltd | Dungannon | 2022 |
| Duns Road Developments 2022 Ltd | Edinburgh | 2022 |
| Dunsandel Services Limited | Portstewart | 1988 |
| Dunselma Country Estate Limited | Dunoon | 2008 |
| Dunsfold Heritage Group Ltd | Cranleigh | 2017 |
| Dunsfold Research Group Limited | Cranleigh | 2017 |
| Dunsford Storage Ltd | Bath | 2013 |
| Dunsinane Consultants Limited | Dundee | 2016 |
| Dunsley Holdings Limited | Huddersfield | 2002 |
| Dunsmore Motor Traction Ltd | Rugby | 2018 |
| Dunstan Builders Ltd | Chipping Norton | 2010 |
| Dunstan Meadows 1958 Limited | Redruth | 2014 |
| Dunster Limited | St Albans | 2018 |
| Dunston (Electrical Services) Limited | Kingston Upon Hull | 2009 |
| Duntherm Ltd | Salford | 2013 |
| Dunton Green Management Company (NO.1) Limited | High Wycombe | 2005 |
| Dunton Green Management Company (NO.2) Limited | High Wycombe | 2005 |
| Dunton House Management Limited | Worcester | 1997 |
| Dunton Manor Properties Limited | London | 2004 |
| Dunvale Limited | Dungannon | 2011 |
| Dunvegan Promotions Limited | Helensburgh | 2014 |
| Dunwell Holding Limited | London | 2021 |
| Dunya Global Ltd | Birmingham | 2013 |
| Dunya International Limited | Mitcham | 2010 |
| Dunya TV Limited | Mitcham | 2010 |
| DUO Delivers Limited | Crawley | 2016 |
| DUO Homes (Scotland) Limited | Gatehouse Of Fleet | 2008 |
| Duodu London Ltd | Crewkerne | 2022 |
| Duofarm Limited | Kidlington | 1979 |
| Duomi Trade Co., Ltd. | Beckenham | 2023 |
| DUP Holdings Limited | Chichester | 2011 |
| Duplex Communications Ltd | High Wycombe | 2025 |
| Duplica Limited | Aberdeen | 2024 |