| A.J.P. Oakworks Limited | Eastleigh, Southampton | 2005 |
| A.J.Parrish Limited | Bedfordshire | 1962 |
| A.J.R. Fasteners Limited | Thirsk | 1984 |
| A.L. LEE Farms (ELY) Limited | Ely | 1981 |
| A.L. Legge & SON Limited | Norfolk | 1986 |
| A.L. Peters & Sons Limited | Hertford | 1960 |
| A.L.Alston and Company Limited | East Dereham | 1956 |
| A.L.Betts Limited | Kent | 1959 |
| A.L.M Tree Care Ltd | Bexhill On Sea | 2023 |
| A.L.Tozer Limited | Leatherhead | 1944 |
| A.M. & a. Calder Farms Limited | Berwickshire | 1957 |
| A.M. & S.M. Enterprises Limited | Newry | 2009 |
| A.M. Equestrian Ltd | Otley | 2024 |
| A.M. Equestrian Services Limited | Buckingham | 2025 |
| A.M. Greig (Farms) Limited | Haddington | 1996 |
| A.M. Jacques Ltd | Bedworth | 2018 |
| A.M.C Lifting Solutions Limited | Workington | 2014 |
| A.M.Crabtree Ltd | Village, Royton | 2004 |
| A.N. Polhill Farms Limited | London | 1996 |
| A.N. Rowland Limited | London | 1995 |
| A.N.C. Services (Scotland) Ltd | Kilmarnock | 2025 |
| A.N.Kerr Farms Limited | Sleaford | 2019 |
| A.O.Barber Limited | Berwick-Upon-Tweed | 1971 |
| A.O.D. Fishing Ltd | Belfast | 2016 |
| A.P. Burlton (Turkeys) Limited | Royston | 1982 |
| A.P. Hall Contractors Ltd | Shrewsbury | 2008 |
| A.P. Hodgson Farm Ltd | North Yorkshire | 2007 |
| A.Pinchin Contracting Ltd | Boston | 2026 |
| A.Q.F. Contractors Limited | Lockerbie | 2012 |
| A.R. Carlisle & Sons Limited | Beds | 1949 |
| A.R. Craven Farms Limited | Boston | 1995 |
| A.R. Garrett & SON Limited | Burstwick | 2018 |
| A.R. Neaves and Sons Limited | Sittingbourne | 1983 |
| A.R. Richards Limited | Market Drayton | 2003 |
| A.R. Rural Services Ltd | Coventry | 2024 |
| A.R. Waddell Limited | East Lothian | 1961 |
| A.R.B Agri Fencing Specialist Ltd | Kettering | 2017 |
| A.R.C. Rural Services Limited | Ashford | 2003 |
| A.R.Lane(Cowsden)Limited | Worcester | 1941 |
| A.R.T. Agricultural Drone Services Ltd | Lincoln | 2026 |
| A.R.Wilson Limited | Norfolk | 1940 |
| A.Rowlands & Son(Preston Brook)Limited | Nr, Wrexham, | 1961 |
| A.S. Buchan Ltd. | Peterhead | 2002 |
| A.S. Harman Limited | Colindale | 1973 |
| A.S. Maitland (Farms) Limited | Wellington | 1975 |
| A.S.Allman Limited | | 1961 |
| A.S.P. Farming Limited | Milton Keynes | 2004 |
| A.Sillett Tree Surgeon Ltd | Norwich | 2017 |
| A.T Lawn Care & Landscaping Ltd | Hayle | 2024 |
| A.T. Collings Limited | Chelmsford | 2014 |
| A.T. Livestock Ltd | Carnforth | 2024 |
| A.T. Mechanical & Welding Services Ltd | Larne | 2019 |
| A.T. Richardson & SON Limited | Ashbourne | 1972 |
| A.T.E.S. Limited | Fraserburgh | 1998 |
| A.T.G. Turnbull Limited | Barnetby | 1965 |
| A.T.Howie Limited | Bodmin | 1966 |
| A.V. Harrison (Transport) Limited | Doncaster | 1947 |
| A.V.Youngs(Farms)Limited | Norfolk | 1959 |
| A.W. & A.J. Barnard (Farms) Limited | Halstead | 1970 |
| A.W. & G.W. Day Limited | Chelmsford | 1976 |
| A.W. Doel & Sons Limited | Chippenham | 1997 |
| A.W. KAY Farming Limited | Brigg | 2018 |
| A.W. Mortier (Farms) Limited | Woodbridge | 1964 |
| A.W. Phoenix & Sons Limited | Brothertoft Boston | 2004 |
| A.W. Smith & Sons Limited | Louth | 1954 |
| A.W. Warner & Sons Limited | Canterbury, | 1963 |
| A.W.Green and Sons(Farmers)Limited | Nottingham | 1965 |
| A.W.Page and Co.(Seeds)Limited | Sleaford | 1968 |
| A.W.R. Houghton & SON Limited | Oakham | 1946 |
| A.W.Squier Limited | Canewdon | 1941 |
| A1 Agriculture Ltd | Waltham Abbey | 2025 |
| A1 Bloodstock Limited | Hemel Hemsptead | 2006 |
| A1 Pet Welfare & Rescue Ltd | Clacton-On-Sea | 2024 |
| A1 Tree & Grounds Ltd | St. Austell | 2016 |
| A19 Fire Wood Ltd | York | 2026 |
| A2BEE Ltd | Kidlington | 2025 |
| A2I Natural Horsemanship Ltd | Luton | 2022 |
| A2Z Pet Services Ltd | London | 2026 |
| A4 Farmers Limited | Calne | 2017 |
| AA Charters Ltd | Gourock | 2025 |
| AA Dewes & Sons Limited | Lutterworth | 2016 |
| AA Fishing Limited | Fraserburgh | 2024 |
| AA Hire Ltd | Caerphilly | 2021 |
| AA Industrial Property Ltd | Woodford Green | 2020 |
| AAB Farms Limited | Banchory | 2002 |
| Aafc Ltd | London | 2026 |
| Aafri Global Services Limited | London | 2024 |
| Aagri Ltd. | Grimsby | 2015 |
| Aagv Ltd | London | 2020 |
| AAH Therapies Ltd | Kinross | 2024 |
| AAI Foods Ltd | Rochdale | 2023 |
| AAM Farms | Taunton | 2017 |
| AAM Livestock Ltd | Taunton | 2021 |
| Aaron & Jayde Williams Ltd | Hereford | 2024 |
| Aaron Ferguson Ltd. | Dunblane | 2012 |
| Aaron Nicholl Farrier Services Ltd | Bideford | 2011 |
| Aaron Wallace Ltd | Ellon | 2019 |
| Aaron’S ROD Ltd | London | 2026 |
| Aast Farm Limited | Brampton | 2025 |
| AAT Bowman Limited | York | 2019 |