| Douglas Cameron (Scotland) Limited | Perth | 2001 |
| Douglas Campbell Limited | Industrial Estate Musselburgh | 1962 |
| Douglas Industrial Estates Limited | Lanark | 2007 |
| Douglas Mackenzie Limited | Edinburgh | 2003 |
| Douglas Paul Limited | Rotherham | 1999 |
| Douglas Property Solutions Ltd | Norwich | 2020 |
| Douglas Storrie Assets Limited | Lancs | 2005 |
| Douglas Turner Limited | Edgware | 2004 |
| Douglas-Fir GP Limited | London | 2013 |
| Doullally Properties Ltd | London | 2022 |
| Doune Healthcare Limited | Halesworth | 2009 |
| Dounreay Site Restoration Limited | Caithness | 2006 |
| Douro House Management Company Limited | Manchester | 2016 |
| Dova Chemical Ltd | Beckenham | 2024 |
| Dove (Traffic) Services Limited | Croydon | 2006 |
| Dove Associates Limited | Alton | 1985 |
| Dove Care Homes Limited | Surrey | 1986 |
| Dove Dune Limited | Poole | 2016 |
| Dove Group Systems Ltd | Rushden | 2017 |
| Dove Holes 1972 Limited | Buxton | 2015 |
| Dove House Properties Ltd | Northampton | 2010 |
| Dove Management Services Limited | Sheffield | 2001 |
| Dove Recycling Ltd | Fareham | 2005 |
| Dove Valley (Ashbourne) Ltd. | Scunthorpe | 1961 |
| Dovebury Developments Limited | Ashby-De-La-Zouch | 2015 |
| Dovec Global Limited | Waltham Cross | 2024 |
| Dovecot Properties Limited | Edinburgh | 2006 |
| Dovecote Enterprises Ltd | Twickenham | 2022 |
| Doveguard Group Limited | London | 2015 |
| Dover Elevators Ltd | London | 2020 |
| Dover Port Services Limited | Chatham | 2011 |
| Dover Self Storage Limited | Dover | 2000 |
| Dover Ships Stores Limited | Sittingbourne | 2004 |
| Dover Street Holdings Limited | London | 2002 |
| Dovercourt Motor Company Limited(The) | Stoke-On-Trent | 1959 |
| Doveridge Ltd | Long Eaton | 2019 |
| Doves Limited | Nottingham | 1985 |
| Dovestar Trading Limited | Manchester | 2017 |
| Dovestence Limited | London | 1986 |
| Dovetail 3D CAD Solutions Limited | Wellingborough | 2009 |
| Dovetail Antiques and Restorations Limited | Sheffield | 2004 |
| Dovey Cottages Limited | Bideford | 2008 |
| Dowan Limited | Doncaster | 2015 |
| Dowding & Mills (Nominees) Limited | Leeds | 1946 |
| Dowding & Mills Luxembourg Limited | Leeds | 2003 |
| Dowding & Mills(Uk) Limited | Leeds | 1967 |
| Dowell International Trading Co., Ltd | Kenilworth | 2018 |
| Dowid Construction Ltd | Bristol | 2022 |
| Dowise Construction Technology UK Limited | London | 2010 |
| Dowlais Automotive Limited | London | 1981 |
| Dowling Magnets Europe Ltd | Clitheroe | 2002 |
| Dowman Holdings Ltd | Chorley | 2016 |
| Down 2 Earth Garden Services & Maintenance Limited | Hornchurch | 2005 |
| Down Construction Company Limited | Holywood | 1994 |
| Down Garage Equipment Service Limited | Moneyreagh | 2014 |
| Down Place Holdings Limited | London | 2016 |
| Down the Hatch Productions Ltd | London | 2023 |
| Down to Earth Aromatherapy Products Ltd | Bolton | 2017 |
| Down to Earth Direct Limited | Hexham | 2020 |
| Down to Earth Gardens Limited | Oxfordshire | 1996 |
| Down to Earth Retreats Ltd | Royston | 2016 |
| Down to Earth Tree Services Ltd | Hitchin | 2024 |
| Down to the Wire Ltd | Halstead | 2025 |
| Downe NIB Limited | Belfast | 2021 |
| Downend Aggregates and Restoration Limited | Newport | 2009 |
| Downer & White Limited | Sutton Coldfield | 1959 |
| Downfast Limited | Ashford | 2009 |
| Downham Cider Company Limited | Downham Market | 2004 |
| Downham Door Services Limited | King'S Lynn | 1981 |
| Downham Rose Nominees Limited | Bury | 1988 |
| Downham Train Epstein Limited | Bury | 1992 |
| Downhill Management Company Limited | Belfast | 2005 |
| Downhole Performance Products Limited | Salisbury | 2015 |
| Downin One Limited | Hove | 2004 |
| Downing & Sons Limited | Taunton | 2019 |
| Downing (Barwell) Limited | Surrey | 1999 |
| Downing Members Limited | London | 2014 |
| Downing Nominees Limited | London | 2013 |
| Downing Rudman & Bent Limited | | 1952 |
| Downland Leisure Limited | South Molton | 2004 |
| Downlights Direct Limited | Rochdale | 2011 |
| Downloadz Daddy Limited | Bourton On The Water | 2015 |
| Downmill Limited | Coventry | 2021 |
| Downs Crematorium Limited | Sutton Coldfield | 1885 |
| Downs Surgical Limited | Chapeltown, Sheffield | 1988 |
| Downshire House Ltd | Belfast | 2025 |
| Downshire Property Developers Ltd | Belfast | 2000 |
| Downstairs Upstairs Limited | London | 2014 |
| Downsview Road Wantage Limited | Newbury | 2016 |
| Downtown Marine Construction Limited | Sittingbourne | 2004 |
| Downview Manor Management Company Limited | Belfast | 2004 |
| Dowsett & Jenkins Limited | Sutton Coldfield | 1914 |
| Dowsett Mayhew Ltd | Brighton | 2014 |
| Doxbond (NI) Ltd | Belfast | 2013 |
| Doyat Limited | London | 2024 |
| Doyle Land & Property Limited | London | 2023 |
| Doyouknowgeorge Ltd | London | 2025 |
| DP & LW Services (North East) Limited | Newcastle Upon Tyne | 2024 |
| DP Field Services Ltd | Great Yarmouth | 2018 |
| DP Masters Group Co., Ltd. | London | 2016 |