| JMJ Logging Limited | Thurso | 2019 |
| JML Agri Limited | Kenfig Hill | 2023 |
| JMM & Sons Limited | Retford | 2022 |
| JMM Agriculture Limited | Knaresborough | 2020 |
| Jmmw Limited | Ashford | 2020 |
| JMP Farms Limited | Newry | 2016 |
| JMP Land Limited | Ipswich | 1945 |
| JMR Fishing Limited | Haverfordwest | 2019 |
| JMS Environmental Ltd | Inverness | 2016 |
| JMS Tree Care Ltd | Canterbury | 2025 |
| JMT Consulting Ltd | Watford | 2013 |
| JMT Trading Company Limited | Pitlochry | 1994 |
| JMW Arboriculture Ltd | Exeter | 2024 |
| JMW Farms Ltd | Armagh | 2005 |
| JN & AJ Austin Limited | Melton Mowbray | 2012 |
| JN Andrews Commercial and Agricultural Services Limited | Doncaster | 2015 |
| JN Coxhead Limited | Preston | 2005 |
| JN Game Farm Ltd | Daventry | 2025 |
| JN Grange Farm Limited | Wakefield | 2018 |
| JN Hoofcare Limited | Stafford | 2024 |
| JN Livestock Limited | Newtownhamilton | 2020 |
| JN Utilities Limited | Carmarthen | 2025 |
| JN Walker Ltd | Redditch | 2018 |
| JNA Shellfish Limited | Berwick-Upon-Tweed | 2013 |
| JNG Agri Ltd | Caersws | 2024 |
| Jnhc Limited | London | 2011 |
| JNL Contracting Ltd | Southampton | 2016 |
| JNS Fishing Limited | Brixham | 2017 |
| JNS Poultry Ltd | Newry | 2018 |
| JNT Pest Control Ltd | Cleckheaton | 2023 |
| JO Bagnall Ltd | Kidlington | 2010 |
| JO Carlin Ltd | Holsworthy | 2019 |
| JO MAC Fishing Ltd | Avoch | 2022 |
| Joarlies Farm and Stables (JFS) Ltd | Cardiff | 2025 |
| JOB Earnshaw & Bros.Limited | Wakefield | 1911 |
| JOB Fishing Ltd | Fraserburgh | 2019 |
| Jobs UK Aberdeen Ltd | Birmingham | 2023 |
| Jobs UK Aberystwyth Ltd | Birmingham | 2023 |
| Jobs UK Bangor Ltd | Birmingham | 2023 |
| Jobs UK Boroughbridge Ltd | Birmingham | 2023 |
| Jobs UK Bristol Ltd | Birmingham | 2023 |
| Jobs UK Buckinghamshire Ltd | Birmingham | 2023 |
| Jobs UK Cardiff Ltd | Birmingham | 2023 |
| Jobs UK Driffield Ltd | Birmingham | 2023 |
| Jobs UK Dundee Ltd | Birmingham | 2023 |
| Jobs UK Dunfermline Ltd | Birmingham | 2023 |
| Jobs UK Edinburgh Ltd | Birmingham | 2023 |
| Jobs UK FLT Driver Reach Truck and Pivot Steer Bendi Ltd | Birmingham | 2023 |
| Jobs UK Helmsley Ltd | Birmingham | 2023 |
| Jobs UK Inverness Ltd | Birmingham | 2023 |
| Jobs UK Malton Ltd | Birmingham | 2023 |
| Jobs UK Newport Ltd | Birmingham | 2023 |
| Jobs UK Northallerton Ltd | Birmingham | 2023 |
| Jobs UK Pickering Ltd | Birmingham | 2023 |
| Jobs UK Ryedale Ltd | Birmingham | 2023 |
| Jobs UK Scarborough Ltd | Birmingham | 2023 |
| Jobs UK Selby Ltd | Birmingham | 2023 |
| Jobs UK Skipton Ltd | Birmingham | 2023 |
| Jobs UK ST Asaph Ltd | Birmingham | 2023 |
| Jobs UK ST Davids Ltd | Birmingham | 2023 |
| Jobs UK Stirling Ltd | Birmingham | 2023 |
| Jobs UK Swansea Ltd | Birmingham | 2023 |
| Jobs UK Thirsk Ltd | Birmingham | 2023 |
| Jobs UK Wrexham Ltd | Birmingham | 2023 |
| JOC Forestry Ltd | Inverurie | 2026 |
| Jock Bros Ltd | Dalry | 2019 |
| Jockey Club Farming Company Limited | Newmarket | 2012 |
| JOE Carter Ltd | Skegness | 2002 |
| JOE Cartledge Limited | Bracknell | 1962 |
| JOE Court Forestry Ltd | Godalming | 2013 |
| JOE Elliot Limited | Cockermouth | 2002 |
| JOE Geer Ltd | Millom | 2017 |
| JOE Mcclurg Registered Farrier Ltd | Stoke-On-Trent | 2025 |
| JOE Smith Limited | Harleston | 2015 |
| JOE Stinson Ltd | Craigavon | 2012 |
| Joe's GOT Wood Limited | Trowbridge | 2017 |
| Joes Garden Patch Limited | Lincoln | 2022 |
| John a. Ross (Rhynie) Limited | Ross-Shire | 1961 |
| John A.Wells Limited | Nottingham | 1961 |
| John Aprahamian & Company Ltd | Towcester | 2004 |
| John Armstrong Sealand Services Ltd | Newbiggin By The Sea | 2018 |
| John B. Scott Limited | Ayrshire | 1975 |
| John Baggs (Farmers) Limited | Wareham | 1975 |
| John Beacom (Farms) Limited | Brookeborough | 2015 |
| John Bell & Sons (Farmers) Limited | Aberdeenshire | 1961 |
| John Blackhall Ltd | Banchory | 2009 |
| John Blackmore Farming Ltd | Barnstaple | 2012 |
| John Blake T/A Breckland Farriers Ltd | Norfolk | 2004 |
| John Booth & Sons (Lincoln) Limited | Market Rasen | 1984 |
| John Booth Arboricultural Consultants Ltd | Derby | 2007 |
| John Boyd (Farms) Limited | Lenham | 1956 |
| John Brown Nurseries Limited | Lichfield | 2001 |
| John Brown(Gazeley)Limited | Bury St Edmunds | 1955 |
| John Bryden (Potatoes) Limited | Inchture | 1979 |
| John Buchan Agronomy Ltd | Market Drayton | 2015 |
| John Burgess Services Ltd | Thirsk | 2006 |
| John Caldwell (Farmers) | Arbroath | 1949 |
| John Cameron. (Grazier) Limited | | 1959 |
| John Caswell Limited | Swindon | 1980 |
| John Chambers Agricultural Services Ltd | Dromore | 2011 |