| Alan Gray Cattle Sales Ltd | United Kingdom | 2019 |
| Alan Griffiths Turf and Forestry Ltd | St. Helens | 2014 |
| Alan Hawkes (Farms) Limited | Spilsby | 1976 |
| Alan Hudson Limited | Wisbech | 1958 |
| Alan Irwin Farm Enterprises Ltd | Co Tyrone | 2002 |
| Alan Jackson (Westcotes) Limited | Newcastle Upon Tyne | 1965 |
| Alan Motion Tree Consulting Ltd. | Buchlyvie | 2011 |
| Alan Pudney Limited | Essex | 1959 |
| Alan Simpson Farming Ltd | Tarporley | 2011 |
| Alan Snow Agricultural Engineers Limited | Bideford | 2010 |
| Alan Stead Limited | E Yorks | 2003 |
| Alan Twatt (Potatoes) Limited | Aberdeen | 1976 |
| Alan Wallis Farming Limited | Abingdon | 2017 |
| Alan Weare Limited | | 2001 |
| Alan Woodley & SON Limited | London | 2005 |
| Alandro Imports Ltd | Redditch | 2025 |
| Alasdair Kennedy Limited | Stornoway | 2025 |
| Alasdair Lowe Ltd | Banbury | 2002 |
| Alasdair Simpson Consulting Limited | | 1982 |
| Alastair Findlay Limited | Bury St Edmunds | 2021 |
| Alastair James Leisure Limited | Bideford | 2023 |
| Alayneroy Ltd | Norwich | 2026 |
| ALB Ilie Limited | Bedford | 2025 |
| Alba GU Brath Ltd | Fraserburgh | 2007 |
| Alba Renewables Ltd | Thurso | 2006 |
| Alba Trees Limited | London | 1987 |
| Albacool Refrigeration Ltd. | Fraserburgh | 2004 |
| Albans Lakes Ltd | Rickmansworth | 2018 |
| Albanwise Farming Limited | Cambridge | 2006 |
| Albanwise Limited | Cambridge | 1978 |
| Albany Environmental Services Limited | Bristol | 1999 |
| Albar Landscapes Limited | Glasgow | 1988 |
| Albedale Farms Limited | Andover | 1996 |
| Albert Bartlett & Sons (Airdrie) Limited | Airdrie | 1962 |
| Albert Bartlett Holdings Limited | Airdrie | 2016 |
| Albert Hall (Farms) Limited | York | 2008 |
| Albert Huber Limited | Northwood | 2003 |
| Albida Agriculture 55N Ltd | Glasgow | 2020 |
| Albie Forestry Limited | Annan | 2010 |
| Albion Estates Limited | Chesham | 2018 |
| Albion Hemp Ltd | Bishop'S Stortford | 2019 |
| Albion Laboratories Ukeig | Norfolk | 1995 |
| Albrighton Anglers Limited | Willenhall | 2006 |
| Albrighton Poultry Company Limited | Shrewsbury | 1997 |
| Albury Estate Fisheries (2008) Limited | Northumberland | 2008 |
| Albury Vineyard Limited | Guildford | 2006 |
| Alby Produce Limited | Norwich Norfolk | 1997 |
| Alca Torda Dive Limited | Kirkcudbright | 2019 |
| Alchemy Agronomy Ltd | Lincoln | 2023 |
| Alchemy Alpacas Ltd | Gloucester | 2019 |
| Alchemy Bloodstock Ltd | Derby | 2020 |
| Alchemy Farms Ltd. | Boston | 2002 |
| Alcora Ltd | Fraserburgh | 2017 |
| Alcott Solutions Ltd | Tiverton | 2018 |
| ALD Labradoodles UK Limited | Fareham | 2020 |
| ALD. Agri. Limited | Cardigan | 2004 |
| Aldborough Farms Limited | Norwich | 1975 |
| Aldby Field Nurseries Limited | North Yorkshire | 2007 |
| Aldeburgh Fresh Fish Co Limited | Leiston | 2008 |
| Aldenham Renaissance Community Interest Company | Borehamwood | 2011 |
| Alder Cabin Ltd | Keighley | 2024 |
| Alder Hill Estates Ltd | Kirriemuir | 2023 |
| Alder Mill Enterprise Ltd | Atherstone | 2020 |
| Alderhanger Farm and Fishing Limited | Nuneaton | 2025 |
| Alderhill Limited | Dereham | 2005 |
| Alderley Edge Allotments and Gardens Society Limited | Alderley Edge | 2019 |
| Alderley Farms Limited | 1 Oxford St | 2002 |
| Alderley Land Limited | Chippenham | 1997 |
| Alderley Wood Farm Ltd | Macclesfield | 2023 |
| Aldermaston Services Limited | Reading | 2020 |
| Aldern Limited | Narberth | 2017 |
| Alderney Livestock Company Ltd | King'S Lynn | 2014 |
| Alderoak Accountancy Services Limited | Oswestry | 2019 |
| Alderoak Herefords Limited | Shrewsbury | 2019 |
| Alderslade Farming Limited | Gateshead | 2012 |
| Alderston Dairies Limited | | 2002 |
| Alderville Enterprises Limited | Belper | 1987 |
| Alderwood Game Farm Limited | Fivemiletown | 2022 |
| Aldham Mill Limited | Barnsley | 2023 |
| Aldie Developments Limited | Edinburgh | 1985 |
| Aldington Farms Limited | Ashford | 2010 |
| Aldrich Agricultural Limited | Louth | 2025 |
| Aldridge Farms Ltd | Huddersfield | 2014 |
| Aldridge Mill Ltd | Tiverton | 2018 |
| Aldroughty Stables Ltd | Elgin | 2022 |
| Aldsworth Farm Limited | Chichester | 2007 |
| Alec Bradley Services Ltd | Southampton | 2022 |
| Alec Coney (Farms) Limited | Boston | 1962 |
| Alec Jarrett Land Limited | Bristol | 2016 |
| Aled Davies Agricultural Contracting Ltd | Holywell | 2022 |
| Aled Jones & Daughters Limited | Builth Wells | 2021 |
| Aled Thomas Foot Trimming Limited | Swansea | 2005 |
| Alegria Polo Limited | Ascot | 2022 |
| Alegria PT Limited | Ascot | 2022 |
| Alejandro Equestrian Limited | Chipping Norton | 1994 |
| Alendo Group Ltd | Peterborough | 2023 |
| Alex Bailey Contracting Ltd | Lydney | 2024 |
| Alex Dale Ltd | Berwick-Upon-Tweed | 2008 |
| Alex J Shaw | Inverness | 2023 |
| Alex Jessett Equine Dentistry Ltd | Hungerford | 2009 |