| Dolphin Nominees (UK) Limited | Manchester | 2004 |
| Dolphin Software Systems Limited | Edinburgh | 2000 |
| Dolphin Square Charitable Trustee | London | 2005 |
| Dolsis Properties Management Ltd | Co Londonderry | 2008 |
| Dolton 1962 Limited | Winkleigh | 2014 |
| Dolu Toys UK Limited | Romford | 2013 |
| Dolway Limited | Weymouth | 2013 |
| DOM Dick and Harry Limited | Shipley | 2008 |
| Domabo Marketing Limited | Fleet | 2016 |
| Domain Catch Limited | London | 2022 |
| Domain Check Limited | Peterlee | 1999 |
| Domain Corp Ltd | London | 2024 |
| Domain Privacy Protector Limited | Worcester | 2008 |
| Domain Rental Limited | Hoddesdon | 1999 |
| Domain Robot Limited | London | 2010 |
| Domainate Ltd | Manchester | 2023 |
| Doman Media Ltd | Wembley | 2014 |
| Domanira Ltd | London | 2026 |
| Dome Restaurants Limited | Porz Avenue, Dunstable | 1908 |
| Domedge Group Ltd | London | 2009 |
| Domegulf Limited | London | 2021 |
| Domel & Lake House Residents Association Limited | Surrey | 2003 |
| Domell Ltd | Oldbury | 2019 |
| Domenico D'Avanzo Limited | Blackpool | 2023 |
| Domeplus Developments Limited | Nottingham | 1990 |
| Domeshaw (MR) Limited | Bexley | 2009 |
| Domestek Ltd | Bagshot | 2025 |
| Domestic Cleaners Ltd | London | 2025 |
| Domestic Cleaning Scotland Limited | Glasgow | 2015 |
| Domestic Diamond Cleaners Ltd | Paisley | 2022 |
| Domestic Diamond Group Ltd | Paisley | 2023 |
| Domestic Divas Holdings Limited | York | 2015 |
| Domestic Electrical Fit Outs Ltd | Bristol | 2026 |
| Dometir Limited | Chorley | 1988 |
| Domi Trading Co., Ltd | London | 2024 |
| DOMIK21 Ltd | Haverfordwest | 2023 |
| Dominant Jeans Ltd | Cheadle | 2021 |
| Dominex Stratixy Solutions Ltd | Manchester | 2026 |
| Domingo Stone 1 Limited | London | 2013 |
| Domingo Stone 2 Limited | London | 2013 |
| Dominic Hill Ltd | Eastbourne | 2017 |
| Dominic James Powers Limited | Lymington | 2025 |
| Dominic Margiotta Limited | Manchester | 2024 |
| Dominic Winter Book Auctions Ltd | Nr Cirencester | 2012 |
| Dominica Court Freehold Limited | Windsor | 2005 |
| Dominican Council(The) | Oxford | 1944 |
| Dominidesign Ltd | Doncaster | 2013 |
| Dominique Colette Zanotto Ltd | London | 2023 |
| Dominique Lara Delaney Ltd | Halling | 2025 |
| Domino Analytics Limited | Reading | 2018 |
| Domino Interiors Limited | Sheffield | 2018 |
| Domitian Limited | Bristol | 2012 |
| Domizil 2 Ltd | Manchester | 2023 |
| Domizil 4 Ltd | Manchester | 2023 |
| Domizil 5 Ltd | Manchester | 2023 |
| Domonic Ltd | Harrogate | 2013 |
| Domovoi Ltd. | London | 2015 |
| Domus Group Limited | York | 1946 |
| Domus Property Group Limited | Kendal | 2024 |
| Domus Property Management Limited | Devizes | 2011 |
| Domus-Nostra Ltd | London | 2021 |
| Domuslaudis Limited | Edgware | 2024 |
| Domyway Co., Ltd | Milton Keynes | 2019 |
| DON & Co. Property Limited | Colchester | 2019 |
| DON Construction Limited | Haverhill | 2017 |
| DON Hotels Limited | Omagh | 2016 |
| DON JJ Limited | London | 2019 |
| DON JJL Limited | Mill Hill | 2023 |
| DON Luigi Limited | Tarporley | 2018 |
| DON Quichotte Holding Ltd | London | 2019 |
| DON Shead Limited | Poole | 1982 |
| DON Valley Precision Engineers Limited | Sheffield | 1999 |
| Don-Bur Service Limited | Staffordshire | 1987 |
| Donal Lucey Lawlor Limited | Dartford | 2008 |
| Donald Brown (Brownall) Limited | Stockport | 2020 |
| Donald Marshall Ltd | Macclesfield | 2013 |
| Donald Pattison & Co Limited | West Yorkshire | 1953 |
| Donald Wilson Investments Limited | Edinburgh | 2013 |
| Donaldson Ross Limited | Ringwood | 2004 |
| Donann Consultancy Limited | Dungannon | 2023 |
| Donard Apartments Limited | Bangor | 1979 |
| Donate Clothes Ltd | West Bromwich | 2021 |
| Donatella Limited | Manchester | 2022 |
| Doncaster Bioresonance and Alternative Therapies Limited | Rotherham | 2022 |
| Doncaster Industrial Doors Limited | Doncaster | 2011 |
| Doncaster Metals Ltd | Barnsley | 2010 |
| Doncaster Modelworks Ltd | Doncaster | 2021 |
| Doncaster Rigging Solutions Ltd | Doncaster | 2020 |
| Doncaster School of Motoring Limited | S. Yorks | 2006 |
| Doncaster Telecom Limited | Sheffield | 2009 |
| Donchurch Limited | London | 1988 |
| Dondan Ltd | Birmingham | 2019 |
| Done Developments Limited | Warrington | 2005 |
| Done Management Limited | Warrington | 2003 |
| Done Right Driveways Ltd | Saltash | 2026 |
| Donedealni Limited | Belfast | 2021 |
| Donegall Assets (NO 2) Limited | Manchester | 2012 |
| Donegall Assets Limited | Msnchester | 2012 |
| Donegall Holdco Limited | Manchester | 2014 |
| Donegall Mews Management Company Limited | Belfast | 2001 |