| Dong HE MEI Technology Co., Limited | Cardiff | 2019 |
| Dong Peng Marine Co. Limited | Beckenham | 2017 |
| Dong Rong Trade Co., Ltd | Beckenham | 2022 |
| Dongda Shipping Co., Ltd | Beckenham | 2025 |
| Dongfang Celain Co., Ltd | Cambridge | 2014 |
| Dongguan DDC Apparel Co., Ltd | Beckenham | 2020 |
| Dongguan Edisoneden Gift Co., Ltd | Cambridge | 2014 |
| Dongguan Jhoping Industry Ltd | London | 2013 |
| Dongguan SYX DIE Casting Tech Co., Ltd | Cambridge | 2021 |
| Dongguan Yatto Industrial Limited | Beckenham | 2021 |
| Dongguan Yonghui Leather Machinery Co., Ltd | London | 2020 |
| Dongkuan Import and Export Co., Ltd | Cambridge | 2018 |
| Dongola Road RTM Company Limited | London | 2009 |
| Dongsue Industry Co., Ltd | London | 2018 |
| Dongyang Tongsheng Import and Export Co., Ltd | Beckenham | 2020 |
| Dongyue Industrial Co., Ltd | Cardiff | 2021 |
| Doni Group Ltd | Beckenham | 2021 |
| Donington Museums Limited | Loughborough | 1989 |
| Donkeys Rule the World Ltd | Henfield | 2017 |
| Donkity Yachting Ltd | London | 2026 |
| Donks Ltd | London | 2023 |
| Donmack Homes Ltd | Strathaven | 2023 |
| Donna Branson Consulting Ltd | Rangemore | 2012 |
| Donna D'Acqua Invest Limited | London | 2025 |
| Donna D'Acqua Limited | London | 2025 |
| Donna Louise Mcmullan Ltd | Newtownabbey | 2022 |
| Donna Marie Andrews Limited | Burnley | 2022 |
| Donna Marie Roberts Limited | Woodford Green | 2025 |
| Donnan Financial Services Ltd | Newry | 2009 |
| Donne Investments Limited | London | 2019 |
| Donnerberg Consultancy Limited | London | 2014 |
| Donnie Brown Solutions Limited | Kilmacolm | 2023 |
| Donnington Freehold Company Limited | Worcester Park | 2019 |
| Donnington House Limited | Redhill | 2017 |
| Donnybrook Court Management Company Limited | Belfast | 2002 |
| Dono Venator Limited | Witney | 2024 |
| Donruth Limited | Fivemiletown | 2015 |
| Dont Hump IT Pump IT Concrete Limited | Poole | 2012 |
| Dont Mess With Yorkshire Ltd | Harrogate | 2012 |
| Dontonn New Hold Co. Limited | London | 2015 |
| Donum Holdings Ltd | Ashbourne | 2020 |
| Donut (H.R.) Limited | St. Asaph | 2010 |
| Doodah Productions Ltd | Bexley | 2009 |
| Doolittle Trustees Limited | Hitchin | 2019 |
| Doonaree Holdings Limited | Sale | 2007 |
| Door & Maintenance Limited | Nottingham | 2010 |
| Door Banner Ltd | Aylesford | 2012 |
| Door Distribution Ltd | Glenrothes | 2017 |
| Door Finger Guards Limited | Rayleigh | 2017 |
| Door Finger Protection Limited | Rayleigh | 2017 |
| Door Finger Protector Ltd | Aylesford | 2015 |
| Door Furniture Direct Limited | Sheffield | 2021 |
| Door Handle Superstore Ltd | Blackpool | 2021 |
| Door Handles Limited | Belfast | 2009 |
| Door Repair Services Ltd | Manningtree | 2011 |
| Door Safety Products Limited | Rayleigh | 2017 |
| Door Services Holdings Ltd | Bristol | 2019 |
| Door Trader Ltd | Loughton | 2014 |
| DOOR2DOOR Finance & Sales Ltd | Cardiff | 2024 |
| Doornbos Equipment Limited | Billingham | 2017 |
| Doors and Doors Limited | Spalding | 2023 |
| Doors Direct Limited | Carlisle | 2015 |
| Doors Outlet Limited | London | 2024 |
| Doors With Design Limited | Leicester | 1992 |
| Doorstep Dreams Limited | Carshalton | 2021 |
| Doortech Limited | Leeds | 2011 |
| Doortechnique Garage Doors Limited | Salisbury | 2018 |
| Doorway Property Ltd | Edinburgh | 2019 |
| Doorway Services Limited | Northampton | 2016 |
| Doorway to Value Limited | Merseyside | 2005 |
| Doorworks Limited | Dundee | 1997 |
| Dooyoo UK Limited | London | 2000 |
| Doozi Investment Company Ltd | York | 2006 |
| Doozy Beauty Limited | Beckenham | 2023 |
| Dopadel Norway Limited | London | 2023 |
| Dope Black Women CIC | London | 2021 |
| Doppel:Punkt Ltd | Haverfordwest | 2021 |
| DOR001BUK2 Limited | London | 1988 |
| Dora Accessories Co., Limited | Kenilworth | 2018 |
| Dorak Limited | London | 2008 |
| Dorch Ventures Ltd | Glasgow | 2024 |
| Dorchester and Grosvenor Developments Ltd | Worcester | 2000 |
| Dorchester Build & Maintenance Company Limited | Weymouth | 2005 |
| Dorchester Collection Limited | Dorchester | 2003 |
| Dorchester Concrete and Screed Limited | Broadstone | 2014 |
| Dorchester Homes Limited | Norwich | 2014 |
| Dordan Limited | Taunton | 2015 |
| Dordtech UK Limited | Redditch | 2015 |
| Doreenward Limited | Doncaster | 2013 |
| Dorehouse Business Management Limited | Sheffield | 2006 |
| Dorel (Europe) Ltd. | Leicester | 1996 |
| Dorelbury Holdings Limited | Fareham | 2020 |
| Dorenell Battery Limited | London | 1975 |
| Doreta-Mae Belle Ltd | Sutton Vesey | 2025 |
| Dorhout Mees Limited | East Sussex | 2007 |
| Dorian Consulting Limited | London | 2018 |
| Dorian Jones & Sons Ltd | Llandysul | 2016 |
| Doric Developments Ltd | Bolton | 2011 |
| Doric Precast Concrete Limited | Elgin | 1996 |
| Dorigo (UK) Limited | London | 2012 |