| Alerbi Corp Ltd | London | 2025 |
| Alergee Limited | London | 2011 |
| Alert Care Services UK Ltd | Borehamwood | 2014 |
| Alert Piling Limited | Lichfield | 2011 |
| Alessandra Rich Limited | London | 2009 |
| Alessio Gruber Ltd | London | 2023 |
| Aletheia Nexus Ltd | London | 2025 |
| Alever Properties Limited | Crawley | 2013 |
| Alewco Limited | London | 2015 |
| Alex (International) Holding Ltd | London | 2009 |
| Alex Abram Properties Ltd | Liverpool | 2023 |
| Alex Bone Music Limited | Middlesbrough | 2023 |
| Alex Carter Limited | Fair Oak | 2013 |
| Alex Day Ltd | London | 2020 |
| Alex Eftyhiou Insight Services Ltd | London | 2023 |
| Alex Grimaldi Ltd | London | 2022 |
| Alex Group of Companies Ltd | Thirsk | 2024 |
| Alex Hutcheon & Company (FS) Ltd | Aberdeen | 2013 |
| Alex Inglis Limited | Skelmersdale | 2007 |
| Alex International Trading Limited | London | 2024 |
| Alex Lawrie Factors Limited | Banbury | 1971 |
| Alex Millar (Builders) Limited | Edinburgh | 1973 |
| Alex Siaw & Company Limited | London | 1985 |
| Alex Stewart Agriculture Limited | Liverpool | 1980 |
| Alex Theodoridis-Jones | Thame | 2022 |
| Alex Tozzi Limited | Shoreham-By-Sea | 2017 |
| Alex. Lawrie Receivables Financing Limited | Banbury | 1970 |
| Alexa Meale Ltd | Chesterfield | 2012 |
| Alexander & Co Manchester Limited | Manchester | 2010 |
| Alexander Anthony Ltd | Solihull | 2019 |
| Alexander Brian Rouse Ltd | Canvey Island | 2022 |
| Alexander Drink Distributors Limited | Newton Le Willows | 2003 |
| Alexander Giovanni Warren Limited | London | 2022 |
| Alexander Green Group Limited | Greenham | 2014 |
| Alexander Hall & Company Limited | Havant | 2025 |
| Alexander Harris (Altrincham) Limited | Sheffield | 1995 |
| Alexander James MS Limited | Camberley | 2016 |
| Alexander Joseph Limited | Manchester | 2011 |
| Alexander Knight & Associates Limited | Altrincham | 2024 |
| Alexander Kristoff Limited | London | 2010 |
| Alexander Law Fibreglass (N.I.) Limited | Newtownards | 1975 |
| Alexander Master Holdings Ltd | Essex | 2022 |
| Alexander Millar Limited | London | 2015 |
| Alexander One Ltd | London | 2021 |
| Alexander Preston Estates Limited | Reading | 2017 |
| Alexander Reece Thomson Surveyors Limited | London | 2015 |
| Alexander Road 1957 Limited | Smethwick | 2014 |
| Alexander Rumsey Real Estate Limited | Weybridge | 2023 |
| Alexander Steinbeck Limited | Cardiff | 1995 |
| Alexander Stephens Ltd | Rushden | 2008 |
| Alexander the Grate Ltd | Chard | 2012 |
| Alexander Wray Holdings Limited | Mansfield | 2010 |
| Alexanders Group Ltd | London | 2024 |
| Alexanders London Limited | London | 2014 |
| Alexanders Properties Limited | London | 2024 |
| Alexander’S Residential Care Ltd | Farnborough | 2017 |
| Alexandra & Hillyfields Vets Ltd | Bristol | 2009 |
| Alexandra 1952 Limited | Lockerbie | 2015 |
| Alexandra Bedcovers Limited | Mirfield | 1976 |
| Alexandra Cleaning Company Limited | Eastleigh | 1986 |
| Alexandra Court (Bayswater) Limited | Angmering | 1993 |
| Alexandra Elizabeth Kaye Ltd | Poole | 2022 |
| Alexandra Gardens (Frome) Management Company Limited | Leyburn | 2011 |
| Alexandra House Care Limited | Coventry | 2024 |
| Alexandra Mary Murdoch Ltd | Hayling Island | 2022 |
| Alexandra Mary Wise Ltd | Hayling Island | 2022 |
| Alexandra Murdoch Ltd | Hayling Island | 2022 |
| Alexandra Park Avenue Apartments Limited | Belfast | 2024 |
| Alexandra Real Estate Limited | Co Down | 2000 |
| Alexandra Road 1958 Limited | Hebden Bridge | 2014 |
| Alexandra Wise Ltd | Hayling Island | 2024 |
| Alexandra's Garden Limited | Rugby | 2022 |
| Alexandre of England 1988 Limited | Leeds | 1987 |
| Alexandros Theodoridis Limited | Thame | 2022 |
| Alexia Stam Limited | Beckenham | 2018 |
| Alexine Business Solutions Ltd | London | 2014 |
| Alexis Flooring (Southern) Limited | Aylesbury | 2014 |
| ALF - Corporation Ltd | London | 2016 |
| ALF1E Limited | Harrogate | 2018 |
| Alfa & Omega MEP Ltd | Salisbury | 2024 |
| Alfa Capital Limited | London | 2011 |
| Alfa Color London Ltd | London | 2019 |
| Alfa Events Ltd | Doncaster | 2013 |
| Alfa Fabrication Ltd | Perth | 2020 |
| Alfa Group Norway Limited | London | 2023 |
| Alfa Leisureplex Trustees Limited | Chorley | 2015 |
| Alfa Trustees Limited | Hadleigh | 1993 |
| Alfa-European Investments Corporation Limited | Ipswich | 2001 |
| Alfa-European Limited | Suffolk | 2000 |
| Alfagen Limited | Wrexham | 2023 |
| Alfaman Limited | Harrow | 1982 |
| Alfamir Co., Limited | Stafford, | 2023 |
| Alfatron Electronics Limited | Yateley | 2020 |
| Alfatron Services Ltd | Southampton | 2024 |
| Alfei Co., Ltd | Cambridge | 2019 |
| Alfeus Invest Ltd | London | 2018 |
| Alfie Lets Limited | London | 2016 |
| Alfies Outdoor Living Limited | Taunton | 2026 |
| Alfitu Crowd Group Ltd | Kington, | 2014 |
| Alford Limited | Hessle | 2010 |