| Deery Funeral Services Limited | Glasgow | 2013 |
| Deeside Blinds Limited | Banchory | 2009 |
| Deeside Estates Limited | Manchester | 2000 |
| Deez Property Ltd | Leicester | 2025 |
| Defa International Trade Co., Ltd | Kenilworth | 2018 |
| Default Dawn Ltd | Doncaster | 2026 |
| Defence Fasteners Limited | Oswestry | 2007 |
| Defence Power Systems Limited | Basingstoke | 2017 |
| Defence Technologies Limited | London | 2004 |
| Defender Securities Limited | Harrogate | 2025 |
| Defendnet Technology Limited | Belfast | 2025 |
| Defendsphere Networks Ltd | London | 2025 |
| Defensor Life Safety Systems Limited | Leicester | 2017 |
| Defensor Limited | Leicester | 2021 |
| Defensys Group Ltd | London | 2015 |
| Defiant Technology Ltd | Burton-On-Trent | 2023 |
| Defib Supplies Ltd | Rochester | 2013 |
| Define Real Estate Limited | St. Albans | 2015 |
| Defining Design Limited | Leicester | 2009 |
| Defining IT Ltd | York | 2006 |
| Definitely Cake Limited | Welwyn Garden City | 2016 |
| Definition Films Limited | London | 2000 |
| Definitions Limited | Brighouse | 1957 |
| Defnelia Yachting Ltd | London | 2023 |
| Defreitas Legacy Properties Ltd | Northfleet | 2018 |
| Defuyuan Trading Co., Limited | Beckenham | 2022 |
| DEG Club Ltd | London | 2022 |
| Degitech Limited | Coventry | 2010 |
| Degode Ltd | London | 2023 |
| Degono Limited | Ripon | 2014 |
| Degree Abroad Limited | Cheltenham | 2020 |
| Degusa International Co., Ltd | Beckenham | 2019 |
| Degw Limited | Dunkeld | 2014 |
| Degya Limited | Blackburn | 2010 |
| Dehns Limited | London | 2009 |
| Dehum Limited | Glossop | 2013 |
| DEI Gratia 24/7 Ltd | London | 2023 |
| Deicors Ltd | Cardiff | 2016 |
| Deighton Champney Services Limited | London | 2023 |
| Deimos Investment Ltd | Beckenham | 2023 |
| Deitek Limited | Lincoln | 2008 |
| Deith Leisure Limited | Broadstairs | 1996 |
| Deka Yachting Corporation Ltd | London | 2024 |
| Dekany Design Limited | Southam | 2015 |
| Deker Trailers Limited | Staffordshire | 1997 |
| Dekoda Limited | Ashbourne | 2007 |
| Dekoreya Ltd | Huddersfield | 2024 |
| Dekru Ltd | Manchester | 2023 |
| Dekton Surfaces Limited | Leicester | 2020 |
| DEL REY UK Limited | Romsey | 2020 |
| DEL1 Limited | Bournemouth | 2025 |
| Delaceys Limited | Elland | 2003 |
| Delacon Sweden Limited | London | 2024 |
| Delage & Haughton Limited | Lewes | 2018 |
| Delage ET CIE Limited | Preston | 2000 |
| Delaine Coaches Ltd | Bourne | 2021 |
| Delamere Partnership Limited | Cuddington | 2001 |
| Delamont Properties Limited | London | 1991 |
| Delancey Debt Capital Limited | London | 2008 |
| Delancey Estates Limited | London | 2008 |
| Delancey Real Estate Asset Management Group Limited | London | 2003 |
| Delany Brothers (House Builders) Limited | York | 1977 |
| Delassus UK Limited | Spalding | 1994 |
| Delaunay Freres Limited | Porz Avenue, Dunstable | 1901 |
| Delaware Blue Limited | West Malling | 2022 |
| Delaware Communications Limited | Romford | 1985 |
| Delegateuk Limited | Purley | 2012 |
| Delens 1 Ltd | Kingswood | 2020 |
| Deles Industrial Limited | Beckenham | 2020 |
| Deleycon Ltd | Stockport | 2021 |
| Deleyon Patrick Smith Ltd | Birmingham | 2025 |
| Delfin Crane Service Company Ltd | London | 2025 |
| Delft Industries Limited | Kenilworth | 2018 |
| Delgado Limited | Bradford | 1904 |
| Delgoosh Ltd | London | 2025 |
| Delgreco Homes Limited | Darwen | 2003 |
| Delhi BOY Ltd | Wellingborough | 2009 |
| Deli City Limited | Barnsley | 2008 |
| Deli Fresh Chilled Foods Limited | Nottingham | 1998 |
| Deli Passion Ltd | Bradford | 2024 |
| Deli-Energy Company Limited | London | 2019 |
| Delibritaly Ltd | Southport | 2016 |
| Delicious Catering Limited | Park Royal | 2002 |
| Delight Metal Co., Limited | London | 2023 |
| Delights Beauty Company Limited | Kirk Lane, Yeadon, Leeds | 1997 |
| Delisa Miller (NW) Ltd | Bury | 2014 |
| Delishdrive Ltd | London | 2025 |
| Deliver IT Ltd | London | 2024 |
| Delivered FM Ltd | Leeds | 2017 |
| Deliveries UN Limited | Swansea | 2013 |
| Delivery Hub (UK) Ltd | London | 2016 |
| Delivery Hub London Limited | London | 2015 |
| Deliveryou Limited | London | 2016 |
| Dell Baler Limited | Mitcham | 1946 |
| Dell OIL Ltd | Manchester | 2012 |
| Dellcraft Ltd | London | 2001 |
| Dellenty Consultancy Ltd | London | 2016 |
| Deller Industry Co., Ltd. | London | 2014 |
| Dellingr Limited | Worthing | 2014 |
| Dellow Limited | Westcliff-On-Sea | 1999 |