| Alex Upton Architects Limited | London | 2005 |
| Alex Venables Management Ltd | London | 2016 |
| Alex W Taylor Ltd | Renfrew | 2023 |
| Alex Walden Limited | Ashtead | 2014 |
| Alex Walker Architecture Ltd | Wakefield | 1999 |
| Alex Walker Limited | Torquay | 2021 |
| Alex Wallis Sales Ltd | Worcester | 2025 |
| Alex Walton Design Ltd | London | 2017 |
| Alex Watson Orthopaedic Company Ltd | Grays | 2010 |
| Alex Webster Media Ltd | Llanrwst | 2022 |
| Alex Wentworth-Wood Ltd | Lowestoft | 2025 |
| Alex West Consulting Ltd | London | 2024 |
| Alex White Associates Limited | Hindhead | 2006 |
| Alex White Consulting Limited | Prestwick | 2024 |
| Alex Wilkinson Consulting Limited | London | 2023 |
| Alex Willson Consulting Limited | Esher | 2015 |
| Alex Wilson Photography Limited | London | 1991 |
| Alex Wilson Studio Ltd | West Sussex | 2025 |
| Alex Winship Photography Ltd | Portsmouth | 2016 |
| Alex Wiseman Associates Limited | Manchester | 2009 |
| Alex Wood Genealogy Ltd | Broxburn | 2021 |
| Alex Woolfall Consultancy Limited | Petworth | 2012 |
| Alex Wooll Ltd | London | 2026 |
| Alex Wright Consulting and Training Ltd | Stone | 2025 |
| Alex Wysocki Photography Limited | Exeter | 2022 |
| Alex Yates Engineering Ltd | Salcombe | 2016 |
| Alex Young Consulting Limited | Hove | 2021 |
| Alex Young Design Ltd | Addlestone | 2007 |
| Alex Zepherin Ltd | Croydon | 2019 |
| Alex. Interior Design Ltd | London | 2020 |
| Alex.N-Engineering Ltd | Street | 2017 |
| Alexa Brown Design Ltd | London | 2019 |
| Alexa Co. Limited | Barnet | 2003 |
| Alexa Design Limited | York | 2023 |
| Alexa Galea Design Ltd | Streatley | 2018 |
| Alexa Holding Ltd | Crawley | 2026 |
| Alexa Politano Ltd | London | 2018 |
| Alexa Roche Photography Ltd | London | 2019 |
| Alexa Ryan-Mills Garden Design Ltd | Harrogate | 2015 |
| Alexa Sirbu Ltd | Brighton | 2018 |
| Alexa Wilkinson Ltd | York | 2024 |
| ALEXA35 Ltd | London | 2025 |
| Alexacarter Ltd | Richmond | 2024 |
| Alexadri Ltd | London | 2018 |
| Alexander & Associates (Consulting) Limited | Wolverhampton | 2002 |
| Alexander & Associates Accountants Ltd | Barnet | 2008 |
| Alexander & Co Accountants Ltd | Manchester | 2022 |
| Alexander & Co Lawyers Ltd | Manchester | 2025 |
| Alexander & Co. (Accountancy) Limited | Chalfont St. Giles | 2003 |
| Alexander & Co. (Surrey) Limited | Tadworth | 2013 |
| Alexander & Nicholas Limited | Hythe | 1994 |
| Alexander 3D Limited | Priors Marston | 2014 |
| Alexander Account Relations Ltd | Glasgow | 2023 |
| Alexander Accountancy (Project 1) Ltd | Burton-On-Trent | 2024 |
| Alexander Accountancy Limited | Burton-On-Trent | 2010 |
| Alexander Accountants Limited | Stevenage | 2010 |
| Alexander Accounting Ltd | Ripe | 2014 |
| Alexander Advertising (International) Limited | Wallingford | 1970 |
| Alexander Advisors Limited | London | 2018 |
| Alexander Advisory Ltd | Kingston Upon Thames | 2025 |
| Alexander Advisory Solutions Limited | Surbiton | 2019 |
| Alexander Albert Limited | Middlesbrough | 2022 |
| Alexander Aldridge Consulting Ltd | Northwich | 2016 |
| Alexander Amatosi & Company Limited | Newcastle Upon Tyne | 2011 |
| Alexander and Alexander Bespoke Educational Consultants Limited | Tetbury | 2023 |
| Alexander and Edmond Law Limited | London | 2025 |
| Alexander and Hogg Ltd | Huddersfield | 2011 |
| Alexander and Poole NI Ltd | Antrim, Carrickfergus | 2023 |
| Alexander and Rose Limited | Shrewsbury | 2017 |
| Alexander Andrews Wealth Limited | London | 2016 |
| Alexander Anna Limited | Retford | 2017 |
| Alexander Architecture Ltd | Belper | 2023 |
| Alexander Arthur Consulting Ltd | Wirral | 2021 |
| Alexander ASH & Co. Limited | Woodford Green | 2001 |
| Alexander Associates (Salisbury) Limited | Salisbury | 2017 |
| Alexander Associates Accountants Limited | London | 2013 |
| Alexander Associates Holdings Limited | London | 1997 |
| Alexander Aziz Solicitors Limited | Luton | 2026 |
| Alexander B Lyons Ltd | London | 2024 |
| Alexander Bain and Associates Limited | Kington | 2010 |
| Alexander Beardsley Consultancy Ltd | Nottingham | 2025 |
| Alexander Birch Ltd | Romford | 2025 |
| Alexander Bottom Limited | Watford | 2013 |
| Alexander Boys Design Ltd | Abingdon | 2025 |
| Alexander Bradley Consulting Limited | Aylesbury | 2024 |
| Alexander Breeze Studio Limited | London | 2015 |
| Alexander Bulloch and Company Limited | Glasgow | 2016 |
| Alexander Bursk Limited | Manchester | 2012 |
| Alexander Cameron Consulting Limited | London | 2022 |
| Alexander Capital Management Limited | London | 2016 |
| Alexander Charles Associates Executive Search Ltd | Sleaford | 2016 |
| Alexander Clifford Limited | Warrington | 2019 |
| Alexander Commercial Services Ltd | Yarm | 2025 |
| Alexander Consultancy Group Ltd | London | 2018 |
| Alexander Consultancy Limited | Colchester | 2015 |
| Alexander Consulting (Kent) Limited | Kent | 2004 |
| Alexander Consulting (UK) Ltd | Hitchin | 2014 |
| Alexander Corporate Communications Limited | Birkdale Southport | 2002 |
| Alexander Court (Truro) Management Company Limited | Truro | 2004 |
| Alexander Court Developments Limited | Cheadle | 2004 |