| John R. Dale & Sons Limited | East Lothian | 1955 |
| John R. Graham Limited | Fife | 1960 |
| John R. Wright Limited | Newark | 1973 |
| John R.Keeble and Son(Brantham)Limited | Manningtree | 1948 |
| John Rayner Farms Limited | Hitchin | 1978 |
| John Redden (Farms) Limited | Wellingborough | 1960 |
| John Reddington Ltd | Borehamwood | 2023 |
| John Rennie & Sons (Farmers) Limited | Turriff | 1973 |
| John Richardson & SON (Gosberton) Limited | Boston | 1955 |
| John Rimmer (Sollom) Limited | Preston | 2008 |
| John Ritchie Farms Limited | Eastbourne | 2012 |
| John Roberts & Sons (Oswestry) Limited | Shropshire | 2007 |
| John Rook (Manor Farm) Limited | Hampshire | 1980 |
| John Rook Estates Limited | York | 2023 |
| John Rook Holdings Limited | York | 2023 |
| John Rowsell Limited | Hants | 1951 |
| John S. Pile (Farms) Limited | Lewes | 1966 |
| John Sadd & Sons Limited | Hartfield | 2020 |
| John Sanderson Forestry Limited | Cumbria | 2002 |
| John Saul Limited | Boston | 1989 |
| John Scott & SON (Farmers) Limited | Kirkwall | 2006 |
| John Searl Forestry Limited | St Asaph | 2013 |
| John Selby (Kirton Lindsey) Limited | Lincs | 1965 |
| John Sharp & SON Ltd | Essex | 2004 |
| John Shaw Equestrian Limited | Knutsford | 2007 |
| John Sheard(Farms)Limited | Bedford | 1962 |
| John Skidmore & Co Limited | Bishop Auckland | 2005 |
| John Smith & Sons (Kilmaurs Mains) Limited | Kilmarnock | 2011 |
| John Smith & Sons(Chorley)Limited | Chorley | 1964 |
| John Smith (Cairndinnis) Limited | East Lothian | 1964 |
| John Stacey Limited | Chelmsford | 2012 |
| John Stanley Farriers Limited | Northallerton | 2009 |
| John Steele and SON Limited | Newtownards | 2025 |
| John Strachan Fishing Services Ltd | Peterhead | 2015 |
| John Strang Contractors Ltd | Campbeltown | 2007 |
| John Stuart (Murrial) Limited | Forfar | 1990 |
| John Swain Limited | Yeovil | 1918 |
| John Swinbank Limited | Milnthorpe | 2013 |
| John T. Fall Limited | Bedale | 1977 |
| John Thatcher Farming Limited | Winscombe | 2013 |
| John Tinney & Co Limited | Harlow | 1982 |
| John Turner (Hereford) Limited | Malvern | 1964 |
| John Turner and SON Limited | Oakham | 2025 |
| John V Ltd | Grays | 2021 |
| John W. Sheppard (Wykin) Limited | Hinckley, | 1956 |
| John Watson (Walpole) Limited | Wisbech | 1967 |
| John Weaver (Dairy Farm) Limited | Redditch. | 1950 |
| John Weller (Farms) Limited | Nr Dorking | 1935 |
| John Whalley Holdings Limited | Widdington | 1950 |
| John Whyte Farms Limited | Beccles | 2020 |
| John Wickham (Cranbrook) Limited | Cranbrook | 1986 |
| John Wilson & Sons (Farmers) Limited | Berwickshire | 1993 |
| John Wiseman & Sons Limited | Beeston Kings Lynn | 1957 |
| John Wood Property Limited | Beaumaris | 1971 |
| John Worsfold Limited | Braintree | 1965 |
| John Young (Ringstead) Limited | King'S Lynn, | 1957 |
| Johns Farming Limited | Prescot | 2013 |
| Johns Farms Limited | Newton Abbot | 2023 |
| Johnsey Agricultural Contracting Services Ltd | Cardiff | 2024 |
| Johnsland Group Ltd | Crediton | 2008 |
| Johnson Forestry Limited | Purley | 2017 |
| Johnson Marine Scotland Limited | Shetland | 2015 |
| Johnson Racing Farriers Ltd | Didcot | 2021 |
| Johnson Racing Limited | Newburn | 2007 |
| Johnsons Arborist Ltd | Devizes | 2023 |
| Johnsons Farm Limited | Warrington | 2023 |
| Johnsons Nurseries Limited | York | 1958 |
| Johnston Agri Ltd | Enniskillen | 2022 |
| Johnston Agri Supplies Limited | Newtownbutler | 2017 |
| Johnston Fishing Limited | | 2002 |
| Johnston Forestry Limited | Glasgow | 2016 |
| Johnston Poultry Sales Limited | Dungannon | 2011 |
| Johnstone RAE Limited | Dumfries | 2007 |
| Johnstown Farming Ltd | London | 2026 |
| Johnstown Farms Ltd | Enniskillen | 2004 |
| John’S Tree Services Ltd | Crowborough | 2014 |
| Joice and Hill Poultry Ltd | Peterborough | 1964 |
| Jointline Limited | Witham St Hughs | 1985 |
| Jojax Ltd | Fraserburgh | 2017 |
| Jojo's Vineyard Ltd | Oxfordshire | 2006 |
| Jola Fishing Limited | Oban | 2014 |
| Joland Plant Services Limited | Holywell | 2017 |
| Jolly Brightwell Ltd | Norwich | 1994 |
| Jolly Gamekeeper Supplies Limited | Scunthorpe | 2022 |
| Jolly Pines Limited | Witney | 2026 |
| Jolpool Farming Limited | Stafford | 2012 |
| JON COE Tree Consultancy Ltd | Sheffield | 2015 |
| JON Treasure Tree Services Ltd | Haslemere | 2022 |
| JON W. M. Limited | Macduff | 2007 |
| JON Wall Fisheries Limited | Newark | 2000 |
| Jonah's Handling Limited | Canterbury | 2007 |
| Jonathan Cheetham (Contracting) Limited | Dereham | 1998 |
| Jonathan Connolly Agricultural Contractors Limited | Preston | 2012 |
| Jonathan Cook Forestry Services Limited | Pershore | 2014 |
| Jonathan Johnstone Limited | Lockerbie | 2011 |
| Jonathan Ralling Limited | Spalding | 2019 |
| Jonathan Tait Limited | Rosehearty | 2007 |
| Jonathan Waters (Potatoes) Limited | Bury St. Edmunds | 2005 |
| Jonby Limited | Oswestry | 2018 |
| Jonele Fishing Ltd. | Peterhead | 2007 |