| Aldini Ltd | Cardiff | 2025 |
| Aldis & Co Carpentry Ltd | Church Stretton | 2025 |
| Aldiss Marine Services Ltd | North Walsham | 2020 |
| Aldo Fabrication Ltd | Daventry | 2018 |
| Aldo Limited | Holmfirth | 1986 |
| Aldo Sartori Ltd | London | 2021 |
| Aldoc Ltd | Beverley | 2012 |
| Aldomak Limited | Glasgow | 1974 |
| Aldona Seals Ltd | Peterlee | 1988 |
| Aldor Solutions Ltd | Daventry | 2019 |
| Aldous and Stamp (Services) Limited | Beckenham | 1967 |
| Aldous Lamont Limited | Ipswich | 1998 |
| Aldred Cricket Bats Ltd | Ilkeston | 2021 |
| Aldreds the Bakers Limited | Nottingham | 2017 |
| Aldridge Bright Bar Limited | Stoke Prior | 2020 |
| Aldridge Carpentry & Property Care Ltd | Burton-On-Trent | 2018 |
| Aldridge Fabrications (AF) Limited | Burntwood | 2015 |
| Aldridge Furnishings Limited | Leigh | 2002 |
| Aldridge Glass Limited | Bishop'S Stortford | 2013 |
| Aldridge Holdings Limited | Birmingham | 1991 |
| Aldridge Plastics Limited | Bagnall Street, Hill Top | 1968 |
| Aldridge Solutions Ltd | Worcester | 2020 |
| Aldrington Press Limited | Shoreham-By-Sea | 1984 |
| Aldroubi Medical International Ltd | Epsom | 2021 |
| Aldwick Builders Ltd | Bognor Regis | 2019 |
| Aldwick Wine Limited | Bristol | 2025 |
| Aldworth Brewing Company Ltd | Reading | 2021 |
| ALE Electrical Ltd | Hornchurch | 2020 |
| ALE Engineering Repairs Ltd | Edinburgh | 2024 |
| ALE Finance Services Limited | London | 2016 |
| ALE Jewels Ltd | London | 2022 |
| Alea Jewellery London Ltd | London | 2025 |
| Alebeacakes Ltd | Sheffield | 2025 |
| Alec Clinton Civils Ltd | Skelmersdale | 2025 |
| Alec Dodd Joinery Limited | Preston | 2015 |
| Alec Doherty Jewellery Ltd | London | 2021 |
| Alec Events Ltd | Newport Pagnell | 2019 |
| Alec Jarrett Limited | Bristol | 1962 |
| Alechemist Limited | Sheffield | 2020 |
| Alechemy Brewing Ltd | Edinburgh | 2011 |
| Alecseei Limited | London Twickenham | 2020 |
| Alecta Technical Solutions Ltd | Ringwood | 2017 |
| Alector Ltd. | Glasgow | 1999 |
| Alectron Ltd | Portsmouth | 2017 |
| Aled Morgan Construction Ltd | Carmarthen | 2026 |
| Alednak Limited | Derby | 2016 |
| Aleees UK Ltd | Edgware | 2022 |
| Aleena’S Cakes Ltd | Birmingham | 2023 |
| Aleezliaqat Ltd | Glasgow | 2026 |
| Alegria Group Limited | London | 2025 |
| Alegria Ltd | Nottingham | 2015 |
| Alejamte Ltd | Whitstable | 2023 |
| Alejandro's Wines Limited | Stockport | 2018 |
| Alejo Ltd | London | 2025 |
| Aleks Zolts Ltd | London | 2025 |
| Aleksandar P&Y Ltd | Hatfield | 2024 |
| Aleksandar's Bakery Limited | Belfast | 2019 |
| Alekscleaning Limited | Lincoln | 2020 |
| Aleksma Flying Vehicles Ltd | London | 2024 |
| Aleksma Ltd | London | 2024 |
| Aleksma Technologies Ltd | London | 2024 |
| Aleluia Aircraft Technical Maintenance Services Ltd | Cambridge | 2024 |
| Alemacoffee Ltd | Bury St. Edmunds | 2022 |
| Alemar Shipping Consultancy Ltd | Glasgow | 2025 |
| Alemary Bakery Ltd | Crewe | 2022 |
| Alembic Limited | Penarth | 1989 |
| Alembic Manufacturing Limited | Penarth | 2003 |
| Alenn UK Limited | London | 2017 |
| Alentec Orion Limited | Bolton | 1928 |
| Alentejano Bakery Limited | London | 2009 |
| Alenzacandles Ltd | Watford | 2025 |
| Aleo Plating Limited | Liverpool | 1996 |
| Alepine Ltd | Shaftesbury | 2014 |
| Aleppo Premium Limited | Manchester | 2020 |
| Alere Technologies Limited | Dundee | 2004 |
| Aleri Ltd | Northwich | 2016 |
| Alero-Uk Ltd | London | 2024 |
| Alert Packaging Limited | London | 1987 |
| Alert Renewables Ltd | Paignton | 2023 |
| Alerta Medical Ltd | Irvine | 2019 |
| Alerter Group Limited | Derby | 2000 |
| Alertis Ltd | Bolton | 2001 |
| Alertsensor Tech Ltd | Beckenham | 2025 |
| Ales Garages Limited | London | 2010 |
| Ales Logistics Ltd | Grays | 2018 |
| Alessandro Balletto Aviation Ltd | Cambridge | 2023 |
| Alessandro Grasso Ltd | Cambridge | 2026 |
| Alessia’S Cakes Ltd | Cardiff | 2018 |
| Alesta Yacht Service Ltd | London | 2019 |
| Aletheia Jewellery Ltd | London | 2025 |
| Alethia Group Ltd | London | 2024 |
| Aletto Furniture Limited | Bristol | 2025 |
| Aleva Labs Limited | Hitchin | 2024 |
| Alevid Ltd | London | 2010 |
| Alevo Groups Ltd | London | 2026 |
| Alewife and Brewster Ltd | Canterbury | 2016 |
| Aleworks Brewing Company Ltd | Pulborough | 2021 |
| Alex & Alessandro Limited | London | 2022 |
| Alex & Clement Limited | Dudley | 2020 |
| Alex & TIA Ltd | Tamworth | 2016 |