| J. & a. Henderson, Limited | Perthshire | 1921 |
| J. & a. Mckenzie, Limited | Bridge Of Earn | 1926 |
| J. & C.R. Milnes Limited | Sheffield | 1999 |
| J. & D. Henderson (Bridgeton) Limited | Aberdeen | 1976 |
| J. & E. Medcalf Limited | Wetherby | 1964 |
| J. & J. Harley Ltd. | Fife | 1997 |
| J. & J. ORR Limited | Berwickshire | 1956 |
| J. & J. Scott Limited | Dumfries | 1927 |
| J. & J. Shellfish Limited | Norfolk | 1984 |
| J. & J.L.Robinson Farms Ltd | York | 2022 |
| J. & M. Barr & Sons Limited | Paisley | 1978 |
| J. & M. Seabrook (Tollesbury) Limited | Maldon | 1973 |
| J. & N. Rymer Limited | Warwick | 2004 |
| J. & P. Carr (Farms) Limited | Brighton | 1975 |
| J. & P. Hedges (Farmers) Limited | Oxford | 1964 |
| J. & R. Emerson Limited | Lincolnshire | 1976 |
| J. & R. Marwick Limited | Orkney | 2004 |
| J. & S. Douglas (Farmers) Limited | Burnley | 1980 |
| J. & S. Graham & Sons Limited | Killinchy | 1956 |
| J. & S. Wight Limited | Strathclyde | 1991 |
| J. a. Equestrian Ltd | Bristol | 2021 |
| J. a. Graham Farming Limited | Alresford | 2006 |
| J. a. Knight & SON (Farmers) Limited | Northampton | 1968 |
| J. Bascombe Contractors Limited | Ferndown | 1983 |
| J. Bealby & Sons Limited | Mansfield | 1956 |
| J. Beeley Collingham & Sons Limited | Notts | 1961 |
| J. Butler (Wholesale Meats) Limited | Milnrow | 1976 |
| J. C. Bowker & Co. | Carlisle | 2006 |
| J. C. Else Limited | Matlock | 2015 |
| J. C. Jackson and SON Limited | Driffield | 2005 |
| J. C. P. Hawken Limited | Exeter | 2006 |
| J. Cook (Tendring) Limited | Ipswich | 1959 |
| J. Craigs Limited | Northumberland | 1976 |
| J. Darlington & SON Limited | Melton Mowbray | 1977 |
| J. Deverill Services Ltd. | Shaftesbury | 1994 |
| J. Donnelly Agricultural Contractor Limited | Morpeth | 2018 |
| J. Douglas Fowlie Limited | Aberdeenshire | 1995 |
| J. G. ORR Limited | Fife | 1999 |
| J. G. Venn Limited | Winchester | 1999 |
| J. Gilbert & SON (Littleport) Limited | Littleport | 1961 |
| J. Goodley & Sons Limited | King'S Lynn | 1960 |
| J. H. Baxter & Sons Limited | Lincolnshire | 2005 |
| J. H. Patchett & Sons Limited | Brough | 1952 |
| J. Handley Limited | North Yorkshire | 1996 |
| J. Heywood Limited | Bedford | 1960 |
| J. Jones Construction Ltd | Saxmundham | 2022 |
| J. Kelly & Sons Limited | Dumfries | 1993 |
| J. L. Edwards & Sons Limited | Merseyside | 2003 |
| J. Lloyd and Sons (Farms) Limited | Aylesbury | 1977 |
| J. Marr (Commodities) Limited | Hessle | 2010 |
| J. Marr (Fishing) Limited | Ferriby Road Hessle | 1897 |
| J. Marr (Seafoods) Limited | East Yorkshire | 1924 |
| J. N. Colton & Sons Limited | Tavistock | 2003 |
| J. Neave (Saxby) Limited | Market Rasen | 1976 |
| J. Norcross Limited | Lincoln | 1977 |
| J. O. Straughan & Co. Limited | Morpeth | 1986 |
| J. ORR & Company Limited | Glasgow | 2002 |
| J. PAO & Co. Limited | Dunstable | 1984 |
| J. Pickard & Co. (Burrington) Limited | Umberleigh | 1990 |
| J. Pickard & Co. (Holdings) Limited | Umberleigh | 1949 |
| J. R. Cozens Wiley Limited | Norwich | 1963 |
| J. R. Greenall Limited | Merseyside | 2003 |
| J. R. Harper Ltd | New Aberdour | 2017 |
| J. R. Tustin & Sons Limited | Evesham | 1961 |
| J. Ralph Stevens Limited | Kent | 1963 |
| J. Rixon Limited | Thame | 1991 |
| J. Rudd (ES) Limited | Wisbech | 2011 |
| J. S. & E. Farming Limited | Newry | 2017 |
| J. Sharkey Trading Ltd | Llandysul | 2025 |
| J. Shepperson Limited | Weybridge | 1996 |
| J. Sherriff Farming Limited | Welwyn Garden City | 2009 |
| J. Taberner Plant Hire Limited | Staffordshire | 1976 |
| J. W. Beaumont Limited | Brough | 2021 |
| J. W. Stretton Limited | Leek | 2014 |
| J. Walker & SON (Agriculture) Limited | Chalfont St. Giles | 2017 |
| J. Ward Farming | Market Rasen | 1959 |
| J. Waugh Electrical Services Ltd. | Peterhead | 2004 |
| J. Wharton (Agriculture) Limited | Swaby Alford | 1964 |
| J.& D.Freeman Limited | Usk | 1959 |
| J.& E.Smillie (Growers) Limited | Perth | 1977 |
| J.& H.Robinson(Iford Farms)Limited | Lewes | 1941 |
| J.& J.R.Allen(Culcheth)Limited | Nr Warrington | 1961 |
| J.& L.K.Braybrooks Limited | Peterborough | 1949 |
| J.A Braithwaite Ltd | Hull | 2026 |
| J.A Entreprenad Ltd | Stockport | 2019 |
| J.A. & E. Montgomery Limited | Yeovil | 1968 |
| J.A. Buchan Ltd. | Peterhead | 2004 |
| J.A. Carlile (Farms) Limited | Goole | 1995 |
| J.A. Clayton Limited | Royston | 1960 |
| J.A. Cussons Limited | Malton | 1977 |
| J.A. Darke Limited | Kingsbridge | 1948 |
| J.A. Earle (Farms) Limited | Richmond | 1996 |
| J.A. Elliss Limited | Lincoln | 1963 |
| J.A. Humphrey Limited | Coleraine | 1998 |
| J.A. Jones & Sons (Churchtown) Limited | Merseyside | 1983 |
| J.A. Noyce Agricultural Ltd | Southampton | 2018 |
| J.A. Paterson & Co. Limited | North Walsham | 1952 |
| J.A. Searle & Sons Limited | Huntingdon | 1998 |
| J.A. Watts (Mareham) Limited | Spalding | 1987 |
| J.A.&G.F.Turnock Ltd | Shrewsbury, | 2009 |