| Jennie Stafford Rural Advisory Ltd | Barnard Castle | 2011 |
| Jennings Farmers Limited | North Yorkshire | 2006 |
| Jennings K9 Limited | Warrington | 2022 |
| Jennotto Limited | Newport | 2012 |
| Jenns Farm Ltd | Holsworthy | 2023 |
| Jenny Knoll Farm Ltd | Bishops Castle | 2016 |
| Jennymill Riding Stables Ltd | Brydekirk | 2023 |
| Jenorah Limited | Oldham | 1996 |
| Jensen Tree Services Limited | Bolton | 2020 |
| Jenx Plant Limited | Llanelli | 2014 |
| Jepa Farming Ltd | Lincoln | 2025 |
| Jepco (Glebe) Limited | Spalding | 2018 |
| Jepco (Soiless Systems) Ltd | Holbeach, Spalding | 2018 |
| Jepco Solutions Limited | Holbeach, Spalding | 2022 |
| Jephson & Co Limited | Kingsbridge | 1967 |
| Jepson Brothers Limited | Warrington | 2003 |
| Jeremy Green Agricultural Contractor Ltd | Diss | 2010 |
| Jeremy Hobson Limited | Dungannon | 2003 |
| Jeremy Smith and Sons (Farriers) Ltd | Newbury | 2018 |
| Jersey Cattle Society of the United Kingdom(The) | Carlisle | 1883 |
| Jervaulx Game Farm Ltd | Darlington | 2023 |
| Jervaulx Game Supplies Limited | Darlington | 2007 |
| Jesonwood International Co., Ltd. | London | 2018 |
| Jess Davies Dressage Ltd | Chippenham | 2025 |
| Jess's Horse Haven Community Interest Company | Milford Haven | 2025 |
| Jesse Scott Limited | Wisbech | 1958 |
| Jessica Draper Equine Limited | Stroud | 2025 |
| Jessie Drea Limited | Horsham | 2011 |
| Jessie Harriet Ltd | St. Agnes | 2023 |
| Jessop Holdings Limited | Chelmsford | 1947 |
| Jessopp's Tree Services Ltd | Cardiff | 2023 |
| Jess’ Furry Friends Ltd | Milton Keynes | 2024 |
| Jester Farm Services Limited | Bromley | 2002 |
| Jesters Equine Ltd | Middlesbrough | 2016 |
| JET (Eco) Ltd | Derby | 2021 |
| JET Farms Limited | Bedford | 2014 |
| Jethro Enterprises Limited | Tavistock | 1989 |
| Jewitt Arboriculture Ltd | Consett | 2025 |
| Jeynes Farming Ltd | Cheltenham | 2025 |
| JEZ Blackburn Bird Trapping Ltd | Thetford | 2021 |
| JF & HE Mullock Limited | Whitchurch | 2011 |
| JF Farming Ltd | Dingwall | 2013 |
| JF Feehan Limited | Belvedere | 2025 |
| JF Fencing and Tree Services Ltd | Tarporley | 2022 |
| JF Sellers Limited | Bury | 2021 |
| JFA Cobs and Hunters Ltd | Ilkeston | 2022 |
| JFA Fishing Ltd | Skeld | 2018 |
| Jfcontracting Ltd | Liphook | 2024 |
| JFD Trawlers Limited | Newton Abbot | 2007 |
| JFK Farm Services Ltd | Snailwell | 2024 |
| JFM Farming Enterprises Ltd | Middletown | 2014 |
| JFW Swiers Farming Company | Northallerton | 2012 |
| JG and JR Metcalfe Limited | Leyland | 2018 |
| JG Equestrian Ltd | Newark | 2024 |
| JG Farms Limited | Nr Coventry | 2013 |
| JG Marine Consultants Limited | Derry | 2016 |
| JG Marine Ltd | Scalloway | 2021 |
| JG Rural & Agricultural Services Ltd | Carlisle | 2022 |
| JG Scott & Sons Ltd | Northwich | 2017 |
| JG Services (UK) Ltd | Glasgow | 2011 |
| JGF Group Ltd | London | 2022 |
| Jghc Limited | Ross-On-Wye | 2011 |
| JGR Farming (Holdings) Limited | Midlothian | 1998 |
| JGS Animal Services Ltd | Sutton Coldfield | 2023 |
| JGS Forestry Ltd | Tiverton | 2024 |
| JGW Dodds Ltd | Hexham | 2025 |
| JH & a Davison Ltd | Ballymena | 2016 |
| JH & C Limited | Bishop Auckland | 2013 |
| JH and JA Nichols Limited | Darlington | 2018 |
| JH Barrow & Sons Holding Ltd | London | 2022 |
| JH Bonham & SON Limited | Buckinghamshire | 2003 |
| JH Duncan Enterprises Limited | Dunfermline | 2013 |
| JH Equestrian Services Limited | Sutton Coldfield | 2019 |
| JH EST AG Mgmt Ltd | London | 2023 |
| JH Shellfish Ltd | Orkney | 2025 |
| JH Shipping Ltd | Hull | 2024 |
| JH Tree Services Hampshire Ltd | Waterlooville | 2022 |
| JH Tree Services Ltd | Gloucester | 2021 |
| JH Trees Ltd | Driffield | 2026 |
| JH Utility Solutions Ltd | Ludlow | 2023 |
| JHB Farms Ltd | Fivemiletown | 2024 |
| JHB GAY Limited | Tetbury | 2021 |
| JHD Agri Ltd | Heathfield | 2017 |
| JHD Solutions Limited | Kingswinford | 2013 |
| Jhdtraining Ltd | Peterborough | 2022 |
| JHE Livestock Limited | Ibstock | 2010 |
| JHF Farming | Northallerton | 2010 |
| Jhfc Farming Ltd | Rochester | 2012 |
| JHS (LF) Limited | Warminster | 2004 |
| Jhstables Ltd | Alresford | 2023 |
| Jiaogulan Ltd | London | 2015 |
| JIG SAW Farm Community Interest Company | Cookstown | 2020 |
| Jijies Rest Ltd | Polegate | 2019 |
| Jill Carenza Equestrian Ltd | Bromsgrove | 2003 |
| JIM Clark (Poultry) Limited | Bradford | 1967 |
| JIM Clark Ltd | Preston | 2002 |
| JIM Cowan Limited | Lincoln | 2014 |
| JIM Pugh Limited | Shrewsbury | 2016 |
| JIM R Limited | Cheltenham | 2025 |
| JIM Shelley Carp Fishing Limited | Beccles | 2017 |