| Didcot Farming Company Limited | Abingdon | 1997 |
| Diddy Paws Limited | Chester | 2020 |
| Didling Farms Limited | Midhurst | 1997 |
| Didlington Fisheries Limited | Northwood | 1950 |
| Didlington Nurseries Limited | Dereham | 2010 |
| Diego Velazquez Limited | Marlborough | 2026 |
| Dienstleistung Arnold Ltd | Manchester | 2023 |
| Diepenbroek Farms Ltd | Taunton | 2014 |
| Different Angle Fishing Limited | Waterlooville | 2024 |
| Difuria Farming (Properties) Limited | Doncaster | 2016 |
| DIG & Dredge Ltd | Plymouth | 2023 |
| Diggle Services Ltd | Derbyshire | 2006 |
| Diggory Harvesting Ltd | Glasgow | 2007 |
| Digital Dolphin Limited | Pontypridd | 2017 |
| Digital Eskills Hub Ltd. | Chelmsford | 2016 |
| Digital Orchard Group Ltd | Chalfont St. Giles | 2011 |
| Digital-Field Ltd | Bedford | 2018 |
| Digittop Limited | Horsham | 1997 |
| Dilham Hall Ltd | North Walsham | 2019 |
| Diligent in the Faith Electrics Ltd | Bristol | 2026 |
| Dillan Wright Limited | Hull | 2003 |
| Dillay PIG Unit Limited | Armagh | 2023 |
| Dillington Park Farm Limited | Ilminster | 1956 |
| Dillons Strawberry Farm Ltd | Bolton | 2026 |
| Dilly's Livery Yard Ltd | Preston | 2017 |
| Dilman Norfolk Ltd | North Walsham | 1990 |
| Dimond Farming Limited | Yeovil | 2013 |
| Dinar Estate Management Limited | Dundee | 1980 |
| Dinas Trees Ltd | Bridgwater | 2023 |
| Dinckley Grange Produce Ltd | Blackburn | 2019 |
| Dinefwr Orchardeers Ltd | Llandeilo | 2024 |
| Dineley Farming Company Limited | Shaftesbury | 1989 |
| Dingle Heyes Farm Stud and Equestrian Limited | Ormskirk | 2016 |
| Dingo’S Dog Club Ltd | London | 2025 |
| Dingwall & Highland Marts Limited | Dingwall | 1994 |
| Dinham Services Limited | Ashby-De-La-Zouch | 2018 |
| Dinkerella Ltd | Bognor Regis | 2026 |
| Dinky Dogz Ltd | Southampton | 2025 |
| Dinkydachshunds Limited | Stockport | 2021 |
| Dinnawell Limited | Much Wenlock | 2010 |
| Dinnerwithshaun Ltd | Wimborne | 2023 |
| Dino's Dawgs and the Green Cat Cafe Ltd | Ferndale | 2021 |
| Dinoshire Limited | Lincoln | 1985 |
| Dinsdale Farming Limited | Darlington | 2012 |
| Dinton & Baverstock Manor Farms Limited | Winchester | 1957 |
| Dinwoodie Farm Management Limited | Ayr | 1988 |
| Dion's Tribe Ltd | Margate | 2025 |
| Direct 2 EWE Ltd | Halifax | 2018 |
| Direct Farm Marketing Limited | Cambridge | 1996 |
| Direct Fertilisers Ltd | St. Helens | 2022 |
| Direct Plants Limited | King'S Lynn | 2016 |
| Dirnan Limited | Cookstown | 2010 |
| Dirty Dogs 2026 Ltd | Dereham | 2026 |
| Dirtypaws Dog Grooming Ltd | Maldon | 2026 |
| Disabled Drive (Mobility Care) Limited | St. Albans | 1995 |
| Disco Seafood Co Limited | Thame | 2024 |
| Discount LOG Company Limited | Gateshead | 2019 |
| Discount Tree Services Limited | Preston | 2019 |
| Discover Energy Limited | Dunmow | 2025 |
| Dishley Farming Limited | Huntingdon | 2008 |
| Dishley Forestry Services Ltd | Derby | 2025 |
| Disley Kennels Limited | Stockport | 2017 |
| District Eating Ltd | Sheffield | 2019 |
| Diva (Sherborne) Limited | Somerset | 2003 |
| Divernagh Dairies Ltd | Newry | 2019 |
| Divers Cove Ltd | Warlingham | 2017 |
| Diverse Forests Holdings Limited | Stirling | 2023 |
| Diverse Forests Limited | Stirling | 2023 |
| Diverse Unique Growers CIC | St Ann'S Chapel | 2026 |
| Divine Haven Limited | Reading | 2024 |
| Diviny Livery Limited | Morecambe | 2008 |
| Dixon Deer Management Ltd | Newcastle Upon Tyne | 2025 |
| Dixon Farmstead Limited | Haltwhistle | 2024 |
| Dixon Smith (Lyons) Limited | Knossington | 1965 |
| DJ & SJ Renewables Limited | Hexham | 2013 |
| DJ Alchemi Limited | | 1999 |
| DJ and SA Banwell Limited | Bradford-On-Avon | 2011 |
| DJ Clarke Farming Limited | Garstang, Preston | 2011 |
| DJ Fall Limited | Richmond | 2022 |
| DJ Hideout Ltd | Skipton | 2023 |
| DJ Merryweather's Limited | Bishop Auckland | 2021 |
| DJ Pythons Ltd | Batley | 2014 |
| DJ Sidebottom Ltd | High Peak | 2019 |
| DJ Young Ltd | Kilmarnock | 2023 |
| Djbcontracting Ltd | Bridgwater | 2022 |
| DJC Farms Limited | Lynch Wood, Peterborough | 1994 |
| DJC Poultry Ltd | Omagh | 2013 |
| DJE Farms Ltd | Elsham | 2024 |
| DJH Equine Transport Limited | Lincoln | 2025 |
| Djjd Equine Ltd | Southend-On-Sea | 2025 |
| DJK Water Solutions Ltd | Leighton Buzzard | 2024 |
| DJL Amenity Ltd | Derby | 2025 |
| DJM F Ltd | Bridgnorth | 2021 |
| DJM Farming Ltd | Wick | 2014 |
| DJM Forestry Ltd | Chippenham | 2019 |
| DJM Ponds Ltd | Tonbridge | 2001 |
| DJT Group Ltd | Spalding | 2019 |
| DJT Plants Limited | Spalding | 2014 |
| DJT Poultry Services Limited | Manchester | 2020 |
| DJW Contracting Limited | Oxford | 2008 |