| Daniel Sheppard Farriery Limited | Bradford On Avon | 2013 |
| Daniel Squire Limited | Hereford | 2012 |
| Daniel Steele Racing Ltd | Henfield | 2024 |
| Daniel Turner Marine and Forestry Ltd | Peterborough | 2013 |
| Daniel&Co. Limited | Wisbech | 2023 |
| Daniel's Produce Limited | Coventry | 2013 |
| Daniell and Hole Limited | Chippenham | 2017 |
| Danirit Fishing Ltd | Peterhead | 2019 |
| Daniru Ltd | Neston | 2023 |
| Danish Forestry Company Limited | Perth | 1997 |
| Danley Marshes Riding Centre Ltd | Sheerness | 2026 |
| Danny Mcshane Ltd | Newry | 2020 |
| Danny Smith Farrier Ltd | Launceston | 2023 |
| Danous Limited | Maidstone | 2010 |
| Dansolam Ltd | London | 2024 |
| Danson Tree Care Limited | Battle | 2013 |
| Danum Farming Limited | Doncaster | 2006 |
| Danworth Farm Limited | Brighton | 1972 |
| Danyel & Co Limited | London | 2020 |
| Danzey Farm Ltd | Tanworth - In - Arden | 2019 |
| DAO Farms Ltd | Glasgow | 2019 |
| DAO Yuan Limited | Barnet | 2019 |
| DAP Haworth Limited | York | 2013 |
| Dapdune Trading Limited | Liverpool | 2014 |
| Daphne's Welsh Lamb Limited | Denbigh | 2019 |
| Dapper Dobbins Ltd | Nuneaton | 2011 |
| Dapper Dogs Limited | Wolverhampton | 2007 |
| Dapper Dogz K9 and Fertility Ltd | Winsford | 2021 |
| Dapple IT Services Ltd | Bishop Auckland | 2021 |
| Dapple Plants Ltd | Chessington | 2025 |
| Dapple Steed Limited | Essex | 2005 |
| Darbee Management Services Ltd | Larne | 1997 |
| Darby Brothers (Burrow Hill) Limited | Wells | 1997 |
| Darby Nursery Stock Limited | Thetford, | 1963 |
| Darby Plants Limited | Norfolk | 2001 |
| Dardani & Large Limited | Wimborne | 1964 |
| Dardarroch Farm Limited | Dumfries | 2026 |
| Dare Farms Limited | Axminster | 2010 |
| Dare Valley Trout Fishery Ltd | Aberdare | 2020 |
| Daren Farm Ltd. | Monmouthshire | 1989 |
| Daresbury Dairy Farm Limited | Warrington | 1991 |
| Daresbury Equestrian Ltd | Daresbury | 2017 |
| Daresbury Estates Limited | Malpas | 2013 |
| Daresbury Properties Limited | Warrington | 1963 |
| Dargues Hope Limited | London | 2020 |
| Dariqus Limited | Knottingley | 2018 |
| Dark Forest Workshops Limited | Penrith | 2016 |
| Dark Sky Alpacas Ltd | Bodmin | 2016 |
| Dark Star Training Ltd | Ilkley | 2025 |
| Darkstone Property Limited | Southampton | 2002 |
| Darkwater Aquatics Ltd | Pontefract | 2016 |
| Darley Global Limited | Essex | 2025 |
| Darlingtons UK Limited | Stoke-On-Trent | 2007 |
| Darlow Contract Services Ltd | Ely | 1999 |
| Darlow Farriers Limited | Sandbach | 2008 |
| Darlton Laurels Limited | Retford | 2019 |
| Darmon B and J Dance Ltd | Reading | 2024 |
| Darnchester Farming Limited | Berwickshire | 2023 |
| Darnchester Poultry Unit Limited | Kelso | 2023 |
| Darnicle Hill Nursery Ltd | Ongar | 2012 |
| Darr House M.I. Limited | Woking | 2022 |
| Darrach Shellfish Ltd | Lairg | 2018 |
| Darragh Agricultural Contracting Limited | Randalstown | 2012 |
| Darrahill Farms Limited | Forfar | 2026 |
| Darren Davies Foot Trimming Ltd | Carmarthen | 2010 |
| Darren Farming | Omagh | 2017 |
| Darren M Benson Crop Spraying Ltd. | Welton | 2005 |
| Darren Radley Contracting Ltd | London | 2026 |
| Darroch Nurseries Ltd | Edinburgh | 2023 |
| Darrow Farm Fishery Ltd | Diss | 2016 |
| Darsham Old Hall Limited | Saxmundham | 2023 |
| Dart Bloodstock Polo Ltd | Gainsborough | 2020 |
| Dart Fisheries Limited | Brixham | 2025 |
| Dart Livery Ltd | Gainsborough | 2023 |
| Dart Valley Fungi Ltd. | Dartington | 2020 |
| Dartan Hall Holdings Ltd | Armagh | 2018 |
| Darthead Limited | Hildenborough | 1976 |
| Dartington Mill CIC | Totnes | 2019 |
| Dartmoor Christmas Tree Farm Ltd | Paignton | 2002 |
| Dartmoor Dairy Limited | Tavistock | 2017 |
| Dartmoor Farming Ltd | Salisbury | 2025 |
| Dartmoor Orchard Ltd | Newton Abbot | 2020 |
| Dartmoor Pony Heritage Trust | Ottery St. Mary | 2005 |
| Dartmoor Pony Society | Newcastle Upon Tyne | 1996 |
| Dartmoor Reach Limited | Newton Abbot | 2020 |
| Dartmoor Roots Ltd | Crediton | 2024 |
| Dartmoor Tree Care and Garden Services Ltd | Yelverton | 2025 |
| Dartmoor Tree Surgeons Ltd | Exeter | 2003 |
| Dartmouth Vineyard Ltd | Exeter | 2026 |
| Darts Farm Limited | Exeter | 2001 |
| Darwn Mrad Ltd | London | 2025 |
| DAS Construction Limited | Llandovery | 2003 |
| Dash Grange Stud Limited | Chipping Norton | 2021 |
| Dashells Holdings Limited | Exeter | 2022 |
| Dashelmere Ltd | Barnstaple | 2026 |
| Dashwood & Twist Limited | Cardiff | 2009 |
| Dassett Farms Limited | Southam | 1954 |
| Dassett Forge Farriery Practice Ltd | Banbury | 2014 |
| Datojem Limited | Bristol | 2010 |
| Datona Limited | Nr Kettering | 1989 |