| Dufinkle Limited | Ipswich | 2019 |
| Dugarah Ltd | Inverurie | 2016 |
| Dugdale Nutrition International Limited | Clitheroe | 2014 |
| Duggan Forestry Ltd. | Manchester | 2008 |
| Dugstar Ltd | Reading | 2017 |
| Duja Elite Ltd | Penzance | 2025 |
| Dukes & Sons Forestry Ltd | N Yorks | 2004 |
| Dukeswood Nursery Limited | Forfar | 2014 |
| Dulce and Flor Ltd | London | 2018 |
| Dulford Copse Limited | Exeter | 2015 |
| Dullam & Co (Farmers) Ltd | South Molton | 2003 |
| Dullingham Estate Farms Limited | Newmarket | 1960 |
| Dullingham Park Limited | Leeds | 2022 |
| Dulverton Farmers Fallen Stock Company Limited | Dulverton | 2010 |
| Dulwich Storage Company Limited | London | 1982 |
| Dumbles Poultry Limited | Knighton | 2013 |
| Dumela Four Limited | London | 2006 |
| Dumfries Farms Limited | Edinburgh | 1986 |
| Dumfries House Home Farm Limited | Cumnock | 2004 |
| Dumfriesshire and Stewartry Hunt Club Limited | | 2007 |
| Dummer Farms Limited | Basingstoke | 1980 |
| DUN Canna Shellfish Ltd | Inverness | 2018 |
| DUN Dearg Ltd | Roy Bridge | 2021 |
| Dunalastair Estate Ltd | Pitlochry | 2023 |
| Dunard Garden Ltd | Glasgow | 2025 |
| Dunbeag Farm Ltd | Bangor | 2025 |
| Dunbeath Farms Limited | Salisbury | 1997 |
| Duncan Dawes Farms Limited | Banbury | 1994 |
| Duncan Farms Limited | Turriff | 2014 |
| Duncan G Grant Ltd | By Kingussie | 2006 |
| Duncan Macgregor Limited | Kilsyth | 1957 |
| Duncan Mackenzie (Gairloch) Limited | Tain | 2003 |
| Duncan Mackerlich Limited | Inverness | 2011 |
| Duncan Spencer Limited | Conwy | 2024 |
| Duncan Wemyss Limited | Tain | 2011 |
| Duncan's Doggie Dig's Limited | Stockport | 2024 |
| Duncans Wood Limited | East Sussex | 2014 |
| Dunchideock Barton Limited | Exeter | 2022 |
| Duncombe Agricultural Limited | Huntingdon | 2010 |
| Duncrun Farms Ltd | Limavady | 2010 |
| Duncrun Fishing Lakes Ltd | Limavady | 2015 |
| Duncton Mill Trout Fishery Ltd | Petworth | 2023 |
| Dundarave Estates Limited | Coleraine | 1954 |
| Dundas Livery Ltd. | South Queensferry | 2017 |
| Dundas Park Stud Limited | Canterbury | 2023 |
| Dundas Shellfish Limited | Westhill | 2013 |
| Dundee Farm Livery & Cattery Ltd | Halifax | 2023 |
| Dundee Farming Company Limited | Cupar | 1953 |
| Dundonald Angling Club Limited | Belfast | 1999 |
| Dundraw Farm | Cumbria | 2007 |
| Dundry Lane Vineyard Ltd | Bristol | 2020 |
| Dunearl Fishing Ltd | Fraserburgh | 2025 |
| Dunelm Farming Limited | York | 2000 |
| Dunfane Farms Limited | Ballymena | 2017 |
| Dunford Farms Limited | Wellington | 2025 |
| Dunford House Fish Farm Ltd | Leeds | 2025 |
| Dunford-Leece Woodland Services Ltd | Corwen | 2024 |
| Dungates Farms Limited | Surrey | 1978 |
| Dungates Sporting Limited | Betchworth | 2015 |
| Dunhill Farm Limited | Diss | 2015 |
| Dunhill Farm Pigs Limited | Diss | 2021 |
| Dunholme Grange Limited | York | 2017 |
| Dunjarg Farm Limited | Kirkcudbrightshire | 2023 |
| Dunkeld House Salmon Fishings Limited | London | 2017 |
| Dunleath Estates Limited | Newtownards | 1965 |
| Dunleavy Vineyards Limited | Bristol | 2008 |
| Dunley Estate Limited | Fareham | 1949 |
| Dunlossit (Farming) Limited | London | 1997 |
| Dunmail Raise Limited | Ambleside | 2021 |
| Dunmoyle Poultry Limited | Omagh | 2017 |
| Dunnanelly Ltd | Crossgar | 2025 |
| Dunne Livestock Ltd | Enniskillen | 2021 |
| Dunnet Forestry Trust | Castletown | 2002 |
| Dunnet Holdings Limited | Glasgow | 1996 |
| Dunnimere Poultry Limited | Tamworth | 2020 |
| Dunninald Farming Ltd | Montrose | 1990 |
| Dunning Farms Limited | Andover | 1989 |
| Dunnow Plant Limited | Lancaster | 2002 |
| Dunnydeer Farms Limited | Aberdeenshire | 1942 |
| Dunreyth Alpacas (Chichester) Limited | Chichester | 2011 |
| Dunscroft Canine Fertility Services Ltd | Doncaster | 2024 |
| Dunsop Bridge Trout Farm Ltd | Clitheroe | 2011 |
| Dunstall Agri Services Ltd | Morriston | 2013 |
| Dunstanburgh Farm Limited | Alnwick | 1997 |
| Duntaynish Woods Limited | Lochgilphead | 2017 |
| Dunthrop Farms Limited | Henley-On-Thames | 1990 |
| Dunton Hall Farming Company Limited | Fakenham | 1964 |
| Dunton Lodge Farm Limited | Baldock | 2008 |
| Dunwalke Limited | London | 2011 |
| Dunwich Equestrian Limited | Saxmundham | 2025 |
| Dunworth Hundred Ltd | Shaftesbury | 2026 |
| DUO Trees Limited | Rochford | 2024 |
| Dupplin Farms (Upper Cairnie) Limited | By Perth | 1986 |
| Durabo Rarebreeds Ltd | Newark | 2024 |
| Duramen Consulting Ltd | Ashford | 2003 |
| Durdle Contracting Ltd. | Conon Bridge | 2021 |
| Durham Hens Limited | Bishop Auckland | 2011 |
| Durhams Farm Limited | Horsted Keynes | 2025 |
| Durie Farms Limited | Leven | 2007 |
| Durkan Equestrian Limited | Horsham | 2014 |