| Dobeco Limited | Leicester | 2025 |
| Dobies (Carlisle) Limited | Gateshead | 1998 |
| Dobson and Hodge Holdings Limited | Doncaster | 2013 |
| Dobson Farms Limited | Usk | 2012 |
| Dobton Ltd | Cambridge | 2019 |
| DOC Line World Limited | Kings Lynn | 2006 |
| Docara Limited | Wakefield | 2017 |
| Docbooking Ltd. | London | 2019 |
| Dock & Roll Ltd | Liverpool | 2009 |
| Dock View NO1 Ltd | Rosyth | 2026 |
| Dock View NO2 Ltd | Rosyth | 2026 |
| Docker's GIN Company Ltd | Ballyclare | 2019 |
| Docking Management Company Limited | Biggleswade | 2014 |
| Docklands Accountancy Limited | London | 2014 |
| Docklands Funeral Services Limited | Sutton Coldfield | 1995 |
| Dockrell Ltd | Rochester | 2023 |
| Dockside (Bristol) Limited | Bristol | 2011 |
| Doclo Ltd | London | 2025 |
| Docmail Ltd | Bath | 1987 |
| Docmarkus Ltd | Manchester | 2024 |
| Docnafiakaan Property Ltd | Birmingham | 2024 |
| Docr Management Limited | Grays | 2021 |
| Doctor Anna Olszewska Ltd | London | 2025 |
| Doctor Frog's Observatory Ltd | London | 2022 |
| Doctor Iuris Ltd | London | 2015 |
| Doctor KSA Limited | London | 2020 |
| Doctor YOU Limited | Leeds | 2009 |
| Doctors and Dentists Bank Limited | London | 1998 |
| Doctors' Close Sandy Limited | Milton Keynes | 2020 |
| Doctus 2001 Limited | Wirral | 2001 |
| Docucentric Holdings Limited | Uxbridge | 2011 |
| Docufile Limited | Sheffield | 1988 |
| Document Scanning Centre Limited | Haslemere | 2010 |
| Dodd Wealthcare Limited | Carlisle | 2022 |
| Doddington Park Farm (Nantwich) Limited | Cheshire | 2000 |
| Dodds Farm Management Company Limited | Gosforth | 2001 |
| Doden Ltd | Retford | 2018 |
| Dodford Manor Limited | Uttoxeter | 2016 |
| Dodnash Estates Limited | Royston | 1990 |
| Dodo Yachting Limited | Blackpool | 2019 |
| Dodollar Products Limited | Cambridge | 2023 |
| Dodwell Builders Limited | Birmingham | 2024 |
| DOE Capital Group Limited | Grays | 2021 |
| DOE Finance Limited | Essex | 1995 |
| DOE HEY Reservoir Co.Limited | Bolton | 1971 |
| DOE Management Limited | Maldon | 1983 |
| DOE Plant Hire Limited | Essex | 1956 |
| DOE Royd 1960 Limited | Sheffield | 2014 |
| Doff Technologies Limited | Nottingham | 1999 |
| Dofine Group Limited | London | 2010 |
| Dog Academy Pro Ltd | Manchester | 2025 |
| Dog Accessories Ltd | Manchester | 2025 |
| Dog Close Limited | Banbury | 2021 |
| Dog Expert Witness Limited | Bewdley | 2014 |
| Dog MUG Limited | Tetbury | 2019 |
| Doga (UK) Limited | Shipley | 2012 |
| Doge Marine Ltd | Cardiff | 2025 |
| DOGECO1N Ltd | Harrogate | 2021 |
| Dogecoin Limited | London | 2022 |
| Doggery Limited | Northampton | 2023 |
| Doggiversium Limited | London | 2021 |
| Doghouse Filmproductions Limited | London | 2008 |
| Dogprotect Invest Limited | London | 2024 |
| Dogprotect Limited | London | 2024 |
| Dogs of WAR Ltd. | Edinburgh | 2001 |
| Dogs Trust Trustee Limited | London | 2014 |
| Dogs Yard Ltd | Saxmundham | 2025 |
| Dogukan Limited | London | 2025 |
| Dogwarts Daycare Ltd | Middlesbrough | 2024 |
| Dogzilla Limited | Harrogate | 2026 |
| Doherty Aggregates Limited | Newton-Le-Willows | 2010 |
| Doherty Earthmovers Limited | West Midlands | 2001 |
| Doherty Medical Limited | Halifax | 1989 |
| Doherty's Group Ltd | Leeds | 2020 |
| DOI Chaang Coffee Company UK Limited | Weymouth | 2011 |
| Doing Enterprise Ltd | London | 2011 |
| Dokie Garments Ltd | Beckenham | 2019 |
| Doktor JAN Falldalen Limited | London | 2020 |
| Dokuz London Ltd | London | 2024 |
| Dolan John Mackenzie Ltd | Insch | 2024 |
| Dolayride Ltd | Dagenham | 2024 |
| Dolce Vita Events Ltd | Solihull | 2010 |
| Dolcemente Limited | Hove | 2018 |
| Dolemore Limited | Bedford | 2013 |
| Dollar RAE Limited | Glasgow | 2011 |
| Dollar Sourcing Ltd. | Stafford | 2014 |
| Dollar Stirling Limited | Glasgow | 2011 |
| Dollardigital Limited | Basildon | 2013 |
| Dollond & Aitchison Limited | Nottingham | 2012 |
| Dollond & Aitchison Pension Trustees Limited | Blackpool | 1995 |
| Dolly and HAT Limited | Wells | 2023 |
| Dolly Blue Centre Limited | Bowness On Windermere | 1994 |
| Dolphin Adventurers Ltd | London | 2022 |
| Dolphin Aerospace Limited | Manchester | 2025 |
| Dolphin Bathrooms Limited | Harrogate | 2011 |
| Dolphin Care Homes Group Limited | Leeds | 2008 |
| Dolphin Care Stairlifts Limited | Calne | 2024 |
| Dolphin Coast Concept Limited | Fishguard | 2007 |
| Dolphin Court Management Limited | Carrickfergus | 1998 |
| Dolphin Gaming Limited | Manchester | 1944 |