| Dapol Model Railways Limited | Wrexham | 1999 |
| Dapplemere Nursing Home Ltd | London | 2015 |
| Daqin Industry Co., Ltd | London | 2016 |
| DAR AL Kaftan London Ltd | London | 2018 |
| DAR Construct Ltd | Dover | 2009 |
| DAR Dora Ltd | London | 2024 |
| DAR Enterprise Limited | Ashford | 2012 |
| Darads Consultancy Ltd | London | 2024 |
| Daraja Innovation Limited | Leicester | 2018 |
| Daram Limited | Glasgow | 1994 |
| Darbie Engineering Ltd | Barking | 2023 |
| Darborah Holdings Limited | Ashford | 2019 |
| Darby and Danielles Ltd | Kington | 2004 |
| Darby Okafor Ltd | London | 2025 |
| Darbyshire Care Services Ltd | Plymouth | 2018 |
| Darchini Concepts Ltd | Bedford | 2025 |
| Darco Contractors Ltd | Brighton | 2019 |
| Darcy Bolton Limited | Middleton | 2007 |
| Darcy Bolton Property Limited | Middleton | 2007 |
| Darcy Limited | Middleton | 2007 |
| Darcy Spillcare Limited | Larkfield | 2022 |
| Darcys Garage Limited | Winchester | 2012 |
| Dardan Security (Systems) Limited | Cambridge | 2007 |
| Dardan Two Limited | Coulsdon | 2016 |
| Dare 2 B Different Limited | North Yorkshire | 2003 |
| Dare Sweden Invest Limited | London | 2023 |
| Dare Sweden Limited | London | 2023 |
| Dare to Empower Limited | Turriff | 2024 |
| Daredevil Recruitment Limited | Lichfield | 2012 |
| Dareks Atelje Investment Limited | London | 2020 |
| Dareks Atelje Limited | London | 2020 |
| Daren Persson Funeral Services Limited | Nottingham | 2003 |
| Daren Whybrow Consulting Limited | Rochester | 2023 |
| Daria Global Ltd | Camberley | 2024 |
| Daria Jessica Gurchenkova Limited | London | 2024 |
| Daris Holding Group Co., Limited | Beckenham | 2016 |
| Darius Bygg Investment Limited | London | 2025 |
| Dariusz Barycki Ltd | Birmingham | 2026 |
| Dark Angel Technologies Ltd. | Gravesend | 2001 |
| Dark Blue Dream Limited | Harrow | 2017 |
| Dark Brands Limited | Midhurst | 2015 |
| Dark Horizon Limited | Faversham | 2021 |
| Dark Horse Investment Consulting Ltd | Lincoln | 2022 |
| Dark Lily Productions Limited | Holbeach | 2022 |
| Dark Ltd | Bristol | 2006 |
| Dark Prism Limited | London | 2024 |
| Darkblue Group Limited | Bourne | 2025 |
| Darke & Taylor Trustee Limited | Witney | 2025 |
| Darkerthanblue UK Limited | Wadhurst | 2001 |
| Darkley Produce Company Limited | Armagh | 1967 |
| Darkwood Group Ltd | Guildford | 2025 |
| Darlene Jayda Madden Ltd | Newry | 2025 |
| Darley Consultancy Limited | Derby | 2022 |
| Darley Stud Management Company Limited | Newmarket | 1984 |
| Darling Electronics Ltd | Dagenham | 2023 |
| Darling Management Services Limited | Wantage | 1998 |
| Darlington Assets (NO 2) Limited | Manchster | 2020 |
| Darlington Assets Limited | Manchster | 2020 |
| Darlington Inter Ltd | Birmingham | 2020 |
| Darlington Investment Planning Limited | Darlington | 1996 |
| Darlington MOT Centre Limited | Darlington | 2025 |
| Darlow Homes (Banbury) Ltd | Cardiff | 2017 |
| Darlun Home Design Studio CYF | Porthmadog | 2019 |
| Darmax Engineering Ltd | Hednesford | 2020 |
| Darnell Trading Ltd | Doncaster | 2026 |
| Darnforth Limited | Salford | 2003 |
| Darnham Limited | Enfield | 2003 |
| Darnicle Limited | Waltham Cross | 2008 |
| Darnley Close 1960 Limited | Holmfirth | 2013 |
| Daron Industrial Company Limited | London | 2012 |
| Darran Richard Brown Ltd | Didcot | 2024 |
| Darrell Vaughan Thompson Ltd | Wirral | 2025 |
| Darren Alan Ward Ltd | Taunton | 2022 |
| Darren Bruce Construction Limited | Ellon | 2020 |
| Darren Christopher Rowland Ltd | Hemel Hempstead | 2025 |
| Darren Edward Kemp Ltd | Durham | 2022 |
| Darren Howells Consultancy Limited | London | 2014 |
| Darren James Thorpe Ltd | Uxbridge | 2024 |
| Darren John Hill Ltd | Monmouth | 2025 |
| Darren ROY Hills Limited | Chatham | 2024 |
| Darren Sweeney Limited | Sleaford | 2014 |
| Darren Thomas Lynch Limited | Littleborough | 2024 |
| Darren Thomas Silver Limited | Littleborough | 2024 |
| Darren William Beale Ltd | Folkestone | 2024 |
| Darren Wrann Limited | Wimborne | 2022 |
| Darrenneilnelson Ltd | Smethwick | 2024 |
| Darron COX Business Consultancy Ltd | Abingdon | 2023 |
| Darshan Int'L Ltd | Darlington | 2014 |
| Darshan Limited | Banstead | 2000 |
| Darston Hi-Tech (UK) Holding Group Ltd. | Beckenham | 2014 |
| Dart 22 Investments Ltd | Wetherby | 2024 |
| Dart Data Systems Ltd | Brecon | 1995 |
| Dart Global Limited | Letchworth | 2025 |
| Dart Leasing & Finance (MSN 63154/63156) Limited | Leeds | 2017 |
| Dart Properties Limited | Exeter | 2001 |
| Dartford Tyres Limited | Dartford | 2011 |
| Darthaven Services Limited | Dartmouth | 2023 |
| Darthaven Services Plymouth Limited | Dartmouth | 2023 |
| Dartington Accommodation and Catering Services Limited | Totnes | 1975 |
| Dartington Pottery Limited | Hindhead | 2011 |