| Alex Johnstone a I Services Limited | Dalry | 2012 |
| Alex Lange Ltd | Malton | 2012 |
| Alex Lingard Contractors Limited | Hastings | 2024 |
| Alex Newson Tree Services Ltd | Pulborough | 2025 |
| Alex ORR Limited | Newry | 2014 |
| Alex Paton & SON (Livestock) Ltd | Girvan | 2021 |
| Alex Rowley Limited | Banbury | 2003 |
| Alex Saunders Limited | Diss | 2026 |
| Alex Sibbald Ltd | Carlisle | 2011 |
| Alex Taylor Farriers Limited | Alcester | 2018 |
| Alex Walker Tree Care Limited | Stockton-On-Tees | 2019 |
| Alex. Colquhoun Limited | Montrose | 1965 |
| Alexander & Angell (Farms) Limited | Gloucester | 1982 |
| Alexander D Phillips Ltd | Cardiff | 2026 |
| Alexander Farming (Holdings) Limited | Dartford | 2021 |
| Alexander Farming Limited | Dartford | 1979 |
| Alexander Farms Limited | Banchory | 1992 |
| Alexander G Mackay Ltd | Tain | 2025 |
| Alexander Hall Farriery Ltd | Gloucester | 2023 |
| Alexander Harley Seeds (Milnathort) Limited | Kinross | 1989 |
| Alexander Harley Seeds Limited | Kinross | 1978 |
| Alexander Jack (Fishing) Limited | Fraserburgh | 2003 |
| Alexander Livestock Limited | Altrincham | 2018 |
| Alexander Machinery Limited | Hertford | 2015 |
| Alexander Maitland (Fishing) Ltd. | Fraserburgh | 2003 |
| Alexander Nicol Limited | Banff | 2006 |
| Alexander Park & SON | Mauchline | 2000 |
| Alexander Simpson Limited | Perth | 1962 |
| Alexander Tree Services Limited | Colchester | 2012 |
| Alexander Tree Surgeons Ltd | Elmstead, Colchester | 2023 |
| Alexander Walker (Peterhead) Ltd. | Peterhead | 2008 |
| Alexander Watt (Contracting) Ltd | Glasgow | 2016 |
| Alexanders Engineering Services Limited | Kinellar | 2010 |
| Alexandra Park Food Forest C.I.C. | Glasgow | 2017 |
| Alexandra Park Land Limited | Glasgow | 2025 |
| Alfabrook Limited | Wool | 2003 |
| Alfah Limited | Southall | 2026 |
| Alfajr Sunrise Ltd | Harrogate | 2021 |
| Alfaris Ltd | Stanmore | 2020 |
| Alfento Ltd | Manchester | 2025 |
| Alford Farming Limited | Alford | 2024 |
| Alfordon Contractors Limited | Crediton | 2019 |
| Alfordon Farms Limited | Devon | 2006 |
| Alfoxton Woodland Enterprises Ltd | Glastonbury | 2022 |
| Alfred Day and SON (Headcorn) Limited | Kent | 1950 |
| Alfred Heading & Sons Limited | Thetford | 1954 |
| Alfred Hymas Limited | Thirsk | 1956 |
| ALG Farms Ltd | Omagh | 2020 |
| Alga (Seaweed) Limited | Carmarthen | 2021 |
| Alga Finance (UK) Ltd | Billingshurst | 2026 |
| Algae Biotechnologies Ltd | Birkenhead | 2021 |
| Algae Control IRE Limited | Ballynahinch | 2020 |
| Algae Weed Control Limited | Ballynahinch | 2020 |
| Algapelago Marine Limited | Northwood | 2016 |
| Algarnick Farms Ltd. | Helston | 1997 |
| Algee Seaweed Ltd | London | 2024 |
| Algidus Holdings Ltd | Dumfries | 2025 |
| ALH Agriculture Limited | Larkhall | 2022 |
| ALH Forestry Ltd | Denbigh | 2023 |
| Alhambra Labs & Pharma Ltd | Cardiff | 2021 |
| ALI Zamam Farms Ltd | Huddersfield | 2021 |
| Alia Solutions Ltd | Newbury | 2019 |
| Alice Begg Dressage Limited | Leigh-On-Sea | 2020 |
| Alick Nicol Limited | Aberdeen | 2003 |
| Alick Patience Ltd | Cromarty | 2016 |
| Alifted Community Initiative | Southend-On-Sea | 2016 |
| Aline Fairweather Limited | Brockenhurst | 1964 |
| Alisdare M Bruce Ltd | Wigton | 2015 |
| Alison Acland Trading Limited | Liverpool | 2014 |
| Alison KAY Fishing Company Limited | Lerwick | 1999 |
| Alison Laws Horsemanship Ltd | Middlesbrough | 2023 |
| Alison Shellfish Limited | Isle Of North Uist | 2017 |
| Alivu Ltd | Malmesbury | 2015 |
| ALJ Farms Ltd | Lytham St. Annes | 2022 |
| Aljack Fishing Ltd | Macduff | 2013 |
| Alkana Corporation Limited | Newport | 2015 |
| Alkmonton Tractors Limited | Nr Derby | 1984 |
| ALL About Alpacas Ltd | Barnsley | 2024 |
| ALL Aspects Tree and Garden Limited | Basingstoke | 2010 |
| ALL Clear Pest Control (Southern) Limited | New Milton | 2019 |
| ALL Counties Farming Ltd | Worthing | 2021 |
| ALL Creatures Great and Small Ltd | Clayton Le Moors | 2017 |
| ALL Dimensions Property Services Limited | Nottingham | 2024 |
| ALL Ears and Tales Ltd | Glastonbury | 2025 |
| ALL Equestrian Ltd | Sevenoaks | 2011 |
| ALL Farmers Ltd | Tilford Farnham | 1991 |
| ALL Hydroponics Ltd | Barking | 2019 |
| ALL KOI Limited | Immingham | 2021 |
| ALL Land Services Ltd | Dunmow | 2018 |
| ALL Makes Fence Ltd | St. Neots | 2020 |
| ALL Naturals Botanica Ltd | Nottingham | 2025 |
| ALL Organic Ltd | Wisbech | 2025 |
| ALL Seasons Farming Ltd | York | 2020 |
| ALL Seasons Recruitment Limited | Southall | 2023 |
| ALL Trees Limited | Pembroke | 2001 |
| ALL Weather Leisure Ltd | Kirkby Stephen | 2019 |
| All-Terrain Logistics Ltd. | Cambridge | 1996 |
| Allabouttrees Limited | Bishop Auckland | 2004 |
| Allagri Ltd | London | 2020 |
| Allan Bright & SON Chris SAW Mills & Timber Merchant Limited | Honiton | 2006 |