| Alpert Management Limited | Wickford | 2021 |
| Alpestris Ltd | Reading | 2006 |
| Alpet Holdings Limited | Bristol | 2002 |
| Alpett Ltd | Ballymena | 2024 |
| Alpex Architecture Limited | London | 2010 |
| Alpextus Limited | Reading | 2025 |
| Alpg Consulting Services Limited | Sheffield | 2007 |
| Alph and Safety Solutions Ltd | London | 2025 |
| Alpha & Omega Consultants Limited | New Malden | 2013 |
| Alpha & Omega Management Consultants Ltd | Tamworth | 2012 |
| Alpha & Omega Marine Ltd | London | 2015 |
| Alpha & Omega MD Ltd | Chatham | 2023 |
| Alpha & Omega, Creative Consultancy Ltd | Mold, Clwyd | 1989 |
| Alpha & Yapps EOT Limited | Cardiff | 2024 |
| Alpha (Axxsys) Limited | London | 2003 |
| Alpha (Jpsb) Group Limited | London | 2019 |
| Alpha (S & P) Holdings Limited | Bristol | 2024 |
| Alpha (Teddington) Ltd | Teddington | 2014 |
| Alpha - Scientists in Reproductive Medicine | London | 2013 |
| Alpha 1 Training and Consultancy Services Limited | Oxford | 2019 |
| Alpha 2 Accountancy Services Limited | Birmingham | 2021 |
| Alpha 245 Limited | London | 1987 |
| Alpha 365.COM Limited | | 2001 |
| Alpha 4 U Services Ltd | Barking | 2019 |
| Alpha 6 Consulting Limited | Stowmarket | 2025 |
| Alpha 60 Consultancy Limited | Burton-On-Trent | 2018 |
| Alpha 777 Limited | Birmingham | 2018 |
| Alpha Accountancy & Management Services 24 Ltd | Bristol | 2024 |
| Alpha Accountancy (UK) Ltd | London | 2005 |
| Alpha Accountancy Services Ltd | Birmingham | 2022 |
| Alpha Accountants (London) Limited | | 2005 |
| Alpha Accountants A304 Ltd | London | 2021 |
| Alpha Accountants and Tax Advisors Ltd | Birmingham | 2008 |
| Alpha Accountants Limited | Berkshire | 1997 |
| Alpha Accountax Limited | Hayes | 2024 |
| Alpha Accounting (UK) Limited | London | 2011 |
| Alpha Accounting Services Limited | Sheffield | 1995 |
| Alpha Accounts Limited | Carlisle | 2022 |
| Alpha Accounts Management Limited | London | 2003 |
| Alpha Ace Media Limited | London | 2018 |
| Alpha Acquisitions (UK) Limited | Bristol | 2006 |
| Alpha Advertising Agency Limited | Preston | 2020 |
| Alpha Advertising Ltd | London | 2018 |
| Alpha Advisers Ltd | Wrexham | 2017 |
| Alpha Advisors Ltd | London | 2014 |
| Alpha Advisory Services Ltd | London | 2020 |
| Alpha Aerospace Limited | London | 2011 |
| Alpha Aliment Ltd | Crawley | 2013 |
| Alpha Alternatives UK Limited | London | 2015 |
| Alpha Analytical Laboratories Ltd | Ilford | 2013 |
| Alpha and Omega Labs UK Limited | Wirral | 2026 |
| Alpha and Omega Semiconductor (UK) Limited | London | 2025 |
| Alpha Animal Tech UK Limited | London | 2021 |
| Alpha Aquilae Consulting Ltd | London | 2026 |
| Alpha Arietis Digital Limited | London | 2018 |
| Alpha Array Ltd | London | 2016 |
| Alpha Assets Ltd | London | 2020 |
| Alpha Associates Accountants and Tax Advisors Limited | Leicester | 2024 |
| Alpha Auto Ltd | Gravesend | 2024 |
| Alpha Aviation Group Limited | London | 2006 |
| Alpha B Consulting Ltd | Wellingborough | 2016 |
| Alpha Bagel Corporation Ltd | Abingdon | 2019 |
| Alpha Beacon Ltd | London | 2018 |
| Alpha Bear Limited | London | 2022 |
| Alpha Beta Capital Limited | Stockport | 2012 |
| Alpha Beta Capital Management Limited | Farnham | 2024 |
| Alpha Beta Collections Ltd | London | 2025 |
| Alpha Beta Live Limited | Spalding | 2009 |
| Alpha Beta Management Services Limited | Aylesbury | 2018 |
| Alpha Beta PC Ltd | Middlesex | 2019 |
| Alpha Beta Solutions Limited | London | 2012 |
| Alpha Beverages International Limited | Burton-On-Trent | 2020 |
| Alpha BIO Systems Limited | Aberdeenshire | 1994 |
| Alpha Biolaboratories Analytical Ltd | Warrington | 2015 |
| Alpha Biolaboratories Corporate Limited | Warrington | 2015 |
| Alpha Biolaboratories COVID-19 Testing Limited | Warrington | 2020 |
| Alpha Biolaboratories Legal Limited | Warrington | 2012 |
| Alpha Biolaboratories Limited | Warrington | 2016 |
| Alpha Biolaboratories Retail Limited | Warrington | 2012 |
| Alpha Biopharma Consulting Ltd | Shefford | 2025 |
| Alpha BIT Consulting Ltd | Ilford | 2019 |
| Alpha Bookkeeping and Accountancy Services Limited | Bury St. Edmunds | 2017 |
| Alpha Bookkeeping Services Limited | Northwood | 2023 |
| Alpha Brain Research Ltd | London | 2026 |
| Alpha Branding Consultancy International Ltd | Manchester | 2019 |
| Alpha Branding Ltd | Lincoln | 2023 |
| Alpha Bravo Charlie Consultancy Limited | Loughton | 2012 |
| Alpha Bravo Marketing Insight Limited | Newbury | 2015 |
| Alpha Building Consultants Limited | Richmond | 2024 |
| Alpha Business and Accounting Services Limited | Draycott | 2002 |
| Alpha Business Consult Limited | London | 2012 |
| Alpha Business Management Limited | Bristol | 2014 |
| Alpha Business Services Limited | Aberdeenshire | 2003 |
| Alpha CAD Ltd | Bury St. Edmunds | 2025 |
| Alpha Canis Majoris Ltd | London | 2021 |
| Alpha Capital Holding Limited | London | 2019 |
| Alpha Care Consultancy Limited | Birmingham | 2025 |
| Alpha Catering Engineers Ltd | Redruth | 2024 |
| Alpha CC Limited | Bristol | 2018 |
| Alpha Centauri Visionary Studios Ltd | London | 2023 |