| D&G Forestry and Fencing Limited | Tonbridge | 2019 |
| D&L ROE Ltd | Preston | 2025 |
| D&N Hicks & Co Ltd | Maesteg | 2020 |
| D&O Poultry Ltd | Dungannon | 2012 |
| D&R Estate Services Ltd | Welwyn | 2024 |
| D&R Shellfish Ltd | Isle Of Skye | 2025 |
| D&R'Sfarm Limited | Chatteries | 2024 |
| D&S Grimes Poultry Ltd | Omagh | 2012 |
| D&S Spence and SON | Leyburn | 2025 |
| D&T Tree Surgery Ltd | Hove | 2019 |
| D&V Farms Ltd | Macclesfield | 2020 |
| D-Agri-S Limited | Halesworth | 2010 |
| D-Tail Plants Ltd | York | 2011 |
| D. & D. W. D. Thomson | Roxburghshire | 1954 |
| D. & J. Air Conditioning Services Limited | Manchester | 1973 |
| D. & N.J. Freeth Ltd | Malmesbury | 2012 |
| D. & R. Hankins (Manea) Holdings Limited | Cambridge | 2018 |
| D. & S. Belton Limited | Freiston Boston | 1976 |
| D. a. Ashcroft & SON Limited | Maldon | 2013 |
| D. a. Braisby Limited | Nottingham | 2012 |
| D. a. Vine Farms Ltd. | East Sussex | 1977 |
| D. Allen and SON, Butchers Limited | Spalding | 1979 |
| D. B. Earthmoving & Plant Hire Limited | Battle | 1973 |
| D. B. Gibbons (Contractors) Limited | Bristol | 1999 |
| D. Bryson (Newmilns) Limited | Ayrshire | 1945 |
| D. C. Farms Limited | York | 1995 |
| D. C. Williamson Limited | Manningtree | 2000 |
| D. Cardno Ltd. | Aberdeenshire | 2005 |
| D. Chennells Limited | Nr Chelmsford | 1960 |
| D. Dalton & SON Limited | Pimperne | 1955 |
| D. E. Brand & Sons Limited | Surfleet | 2001 |
| D. Fairnie and Sons Limited | North Berwick | 1987 |
| D. Geddes (Farms) Limited | Tayside | 1957 |
| D. Goodwin & Sons | Haywards Heath | 1996 |
| D. Haxby Farms Limited | Louth | 1977 |
| D. I. Lamont & Co. Ltd | Mallaig | 2012 |
| D. J. HAY Ltd | Turriff | 2017 |
| D. Jacklin Limited | Brigg | 2004 |
| D. L. Mills Ltd | Cheltenham | 2007 |
| D. Latham Limited | Grange-Over-Sands | 1960 |
| D. M. Hodge Limited | Royston | 1959 |
| D. Macpherson (Plant Hire) Limited | Dingwall | 2003 |
| D. Mcculloch Limited | Glasgow | 2012 |
| D. Mcharg & SON Limited | Stranraer | 1963 |
| D. Mcnair Limited | Manningtree | 1960 |
| D. N. B. Tree Surgery Limited | Liss | 2006 |
| D. Pearman (Poultry) Limited | Birmingham | 1980 |
| D. R. Davies & Sons (Farmers) Limited | Leominster | 1976 |
| D. R. Davies & Sons (Lower Derndale) Limited | Leominster | 1987 |
| D. R. Grady Tree Surgery Ltd | Horsham | 2022 |
| D. R. Wise Ltd. | Richmond | 2021 |
| D. Richardson & Company Limited | Richmond | 1992 |
| D. Robertson & Sons (POT 80) Ltd | Roxburghshire | 2010 |
| D. S. Thornhill (Rushton) Limited | Tarporley | 1995 |
| D. Scott (Cadbollmount) | Inverness | 1958 |
| D. Thurlow Limited | Dereham | 2018 |
| D. W. Lyon Agricultural Contractors Ltd | Biggar | 2007 |
| D.& M.Gedney Limited | Kent | 1962 |
| D.& R.Simmons,Limited | Spalding | 1951 |
| D.A. Nicholson Limited | Barnsley | 2003 |
| D.A. Williams & Sons Limited | Burstwick | 2019 |
| D.A.T. Blundy (Farmers) Limited | Newark | 2002 |
| D.Atkins-C.E. Contractors Limited | Maidstone | 2001 |
| D.C. Watson & Sons (Fenton Barns) Limited | North Berwick | 1929 |
| D.C.G. Tree Surgery Limited | Knottingley | 2002 |
| D.Dark Ltd. | Horsham | 2022 |
| D.E. & D.M. Drinkwater and Sons Limited | Chipping Campden | 2008 |
| D.E. Brand & Sons (Holdings) Limited | Spalding | 2015 |
| D.F. Meanwell Limited | Lincoln | 1973 |
| D.F.Calder Farms Limited | Alnwick | 1960 |
| D.Fennon Tree Solutions Ltd | Northampton | 2023 |
| D.G. Richardson & Sons (Farmers) Limited | Nottingham | 1977 |
| D.G.Bullard Limited | Wisbech | 1957 |
| D.G.E Boarding Ltd | Chorley | 2025 |
| D.H. Creed Limited | Somerset | 2002 |
| D.H. Game Limited | Southampton | 2005 |
| D.H. Pearman & Sons (Over Norton) Limited | Chipping Norton | 1976 |
| D.H. Steed Farms | Sudbury | 1965 |
| D.H. Thomas & Sons Limited | Bishops Castle | 1942 |
| D.H. Willis & Sons Limited | Richmond | 2002 |
| D.H. Wilson Ltd. | Kendal | 2002 |
| D.H.Deptford(Farms)Limited | March | 1958 |
| D.H.Sanderson and SON Limited | Norwich | 1957 |
| D.I.Alston Limited | Stowmarket | 1955 |
| D.J. & M. Parry Limited | Hexham | 1970 |
| D.J. Archer Limited | Hilton | 1983 |
| D.J. Exotic Farms Limited | London | 2018 |
| D.J. Farms Limited | Banbury | 1989 |
| D.J. Fisher (Agricultural Contractor) Limited | Kingsbridge | 2011 |
| D.J. Huxley (Farms) Limited | Whitchurch | 1987 |
| D.J. Raker Limited | Thetford | 1948 |
| D.J. Snell Limited | Birchington | 1978 |
| D.J.Boyce (Outwell) Limited | Nr Wisbech | 1959 |
| D.J.Dampney (Cranborne) Limited | Dorset | 1955 |
| D.J.Dawes(Farms)Limited | Henley-On-Thames | 1963 |
| D.J.Fisher(Farms)Limited | Southminster | 1964 |
| D.J.P. Poultry Handling Services Limited | Craven Arms | 1999 |
| D.J.Styles Limited | Tenbury Wells | 1952 |
| D.K.W. COX & Co. Limited | Devon | 1972 |
| D.L. & H. Griffiths & Sons Limited | Swansea | 1984 |