| Deepdock Limited | Holyhead | 1987 |
| Deepdock Shellfish Ltd | Belfast | 2022 |
| Deeper Green Services Ltd | Bristol | 2019 |
| Deeping Gate Trees Limited | Peterborough | 1998 |
| Deepwild Limited | Fraserburgh | 2002 |
| Deepwood Forestry Ltd | Derby | 2026 |
| Deer & FOX Ltd | Tain | 2014 |
| Deer Dynamics Limited | Kelso | 2018 |
| Deer Force 10 Limited | Buckfastleigh | 2022 |
| Deer Impact Solutions Limited | Bury St. Edmunds | 2022 |
| Deer Park Lawns Ltd | Craigavon | 1999 |
| Deer Services UK Ltd | London | 2025 |
| Deer Stalking Hub Limited | Haywards Heath | 2019 |
| Deer Valley Ltd | Ayr | 2024 |
| Deer View Fisheries Ltd | Exeter | 2025 |
| Deerbarn Livery Ltd | Warwick | 2025 |
| Deere Street Farm Ltd | Northallerton | 2022 |
| Deerfin Farm Limited | Ballymena | 2019 |
| Deerhyde Limited | London | 1981 |
| Deerland Farm Ltd | Salisbury | 2024 |
| Deerness Kennels Limited | County Durham | 2006 |
| Deerness Valley Dairy Limited | Bishop Auckland | 2020 |
| Deerpark AI Centre Limited | Ballymena | 2019 |
| Deerpark Farm Ltd | Larne | 2016 |
| Deerplay Farm Ltd | Halifax | 2026 |
| Deerwise Ltd | Huntingdon | 2026 |
| Deerwork Ltd | Eastbourne | 2012 |
| Deeside Fishing Guides Ltd | Aboyne | 2026 |
| Deeside Lavender Limited | Cardiff | 2018 |
| Deeside Park Conservation Trust | Ellesmere Port | 1996 |
| Defacto Spice and Seeds Limited | Erith | 2025 |
| Defender Falcons UK Limited | Sudbury | 2025 |
| Defender Network Solutions Ltd | London | 2025 |
| Defiance (Fraserburgh) Limited | Fraserburgh | 2008 |
| Defiance Fishing Company Limited | Peterhead | 2012 |
| Defiant Fishing (Whalsay) Company Ltd | Lerwick | 2021 |
| Defqon Frenchies Ltd | Bury | 2021 |
| Deft Limited | Barnet | 2023 |
| Degesh Group Ltd | London | 2021 |
| Deguo Berlin Biotechnology Co., Limited | West Midlands, England | 2025 |
| Dei-Han Limited | Wellingborough | 1998 |
| DEJ Mcclements Limited | Portavogie | 2013 |
| Dejex Supplies Limited | Spalding | 1981 |
| DEL Knowles Farming Ltd | Leeds | 2023 |
| DEL Mostruoso Ltd | Aldershot | 2025 |
| Delagyle Fishing Limited | Cheltenham | 1976 |
| Delamore Farms Limited | Terrington St Clement | 1961 |
| Delarki Hemp Limited | London | 2025 |
| Delfland Nurseries Limited | March | 1985 |
| Delight Salads Limited | Hull | 2016 |
| Deliverwood 1512 Ltd | Market Drayton | 2024 |
| Deliverwood Ltd | Market Drayton | 2023 |
| Dellaporta Wines Ltd | London | 2023 |
| Dellmont Enterprises Limited | Newcastle | 1998 |
| Delnabo Estate Limited | Ballindalloch | 1990 |
| Delph Farm Estates Limited | Prescot | 2020 |
| Delph House Farm Limited | Huddersfield | 1963 |
| Delphenia Maverick Ltd. | Fraserburgh | 2007 |
| Delphorge 83 Limited | Kingswinford | 1983 |
| Delphy UK Limited | Reading | 2007 |
| Delta Echo Limited | Hastingwood | 1993 |
| Delta Farming Group Ltd | London | 2024 |
| Delta Fibreglass Solutions Limited | Stockport | 2011 |
| Delta Flower & Nurseries Limited | London | 2023 |
| Delta Forest UK Limited | Bristol | 2023 |
| Delta Trees Ltd | Southampton | 2022 |
| Delta Veterinary Group Ltd | Plymouth | 2021 |
| Delta Wagyu Europe Limited | York | 2016 |
| Delta-Innovation Limited | Milton Keynes | 2005 |
| Deluxe Doggy Daycare Limited | Hull | 2025 |
| Deluxe Puppies Ltd | Oldham | 2024 |
| Deluxe Tree Surgeons Ltd | Sunderland | 2015 |
| Demalfie Livestock Limited | Aberdeen | 2024 |
| Demap Leisure Ltd | Spalding | 2023 |
| Demby Farm Ltd | Chester | 2021 |
| Demeter Agronomy Ltd | Middlesbrough | 2024 |
| Demeter Harvest Ltd | Omagh | 2014 |
| Demeter Technology Limited | Ely | 2007 |
| Demohouse Limited | Bideford | 1995 |
| Dempsey Agri Limited | Dumfries | 2023 |
| Demure Dogs Ltd | Norwich | 2025 |
| DEN Service Limited | Inverurie | 2024 |
| Denbies Wine Estate Limited | Dorking | 2015 |
| Dench Myriad Ltd | Cardiff | 2015 |
| Denchworth Limited | Devizes | 2006 |
| Dendra Systems Ltd | London | 2014 |
| Dendro Woodland Ltd | Derby | 2026 |
| Denerosharmainecare Ltd | Leeds | 2025 |
| Dengie Bark Park Ltd | Southminster | 2024 |
| Denham Vicarage Farm Limited | Cambridge | 2014 |
| Denholm Potato Growers Limited | Tranent | 1984 |
| Denis Brinicombe Group Limited | Devon | 2001 |
| Denis Cadzow and Company Limited | Tranent | 1959 |
| Denis N. Grundy Limited | Near Spalding | 1954 |
| Denizes Labradors Ltd | Preston | 2023 |
| Denman Trustees Limited | Bristol | 2013 |
| Denmark Farm Ltd | Ely | 2015 |
| Denmarkfield Limited | Kinross | 1957 |
| Denmore Fishing Limited | Arbroath | 2010 |
| Denmuir Limited | Fraserburgh | 2006 |