| Ajpm Consultancy Ltd | Information & communication | 2023 |
| AL Shoukat Spiritual Tours Ltd | Information & communication | 2025 |
| Alan Soutar Darts Limited | Arts & recreation | 2021 |
| Albany 1 Ltd | Construction | 2021 |
| Albion Connection Ltd | Wholesale & retail | 2024 |
| Alchemy Business Ventures Limited | Construction | 2014 |
| Aldon Automotive Limited | Wholesale & retail | 1974 |
| Alese Investment Properties Limited | Real estate | 2021 |
| Alfred George Vehicles Limited | Wholesale & retail | 2023 |
| Alif Code Ltd | Information & communication | 2025 |
| Aligant Homes Ltd | Construction | 2014 |
| Alkaline Solutions Limited | Information & communication | 2007 |
| ALL Occasions (Midlands) Limited | Wholesale & retail | 2013 |
| ALL Things Possible Ltd | Hospitality | 2025 |
| Allbreed Grooming Academy Limited | Other services | 2004 |
| Allbreed Grooming Pensnett Ltd | Wholesale & retail | 2025 |
| Allcontrast Holdings Limited | Financial services | 2025 |
| Allcontrast Limited | Health & social care | 1998 |
| Alloy Wire International Limited | Manufacturing | 1999 |
| Allsopp & Burke (Sedgley) Limited | Transport & logistics | 1983 |
| Allstick Signs & Print Limited | Manufacturing | 2003 |
| Alpha Flooring Solutions Limited | Construction | 2010 |
| Alpha Food Distributions Ltd | Wholesale & retail | 2020 |
| Alpha Sequence Technologies Ltd | Information & communication | 2024 |
| Alpha Testing Services Limited | Professional & scientific | 2022 |
| Alpol West Midlands Ltd | Wholesale & retail | 2022 |
| Alqaaim Ltd | Wholesale & retail | 2026 |
| ALS Marketing Solutions Limited | Arts & recreation | 2016 |
| Alset Automotive Ltd | Wholesale & retail | 2026 |
| Alton Piece Equestrian Centre Limited | Arts & recreation | 2019 |
| Aluminium Machined Components Limited | Manufacturing | 2024 |
| ALX IT Solutions Ltd | Information & communication | 2026 |
| Alzeek Ltd | Wholesale & retail | 2026 |
| AM26 Properties Limited | Real estate | 2020 |
| Amara Steel Ltd | Wholesale & retail | 2015 |
| Ambi-Rad Group Limited | Manufacturing | 2006 |
| Amjid Iqbal Limited | Health & social care | 2005 |
| AMK Construction Solutions Ltd | Professional & scientific | 2015 |
| Amlin Holdings Limited | Financial services | 2018 |
| Amlin Motors Limited | Wholesale & retail | 2013 |
| Amlin Vehicle Hire Ltd | Administrative & support | 2023 |
| Amour Sports Ltd | Professional & scientific | 2024 |
| AMS Refrigeration Limited | Construction | 2002 |
| Andrew Earles MC Ltd | Administrative & support | 2009 |
| Andrew Gilding Limited | Arts & recreation | 2015 |
| Andrew Phillips Insurance Brokers Ltd | Financial services | 2010 |
| Andrew's Watch Co Ltd | Wholesale & retail | 2025 |
| Andrews Electrical Limited | Construction | 1997 |
| Andrews Fire and Security Limited | Professional & scientific | 2002 |
| Androcorys Contracting Ltd | Construction | 2016 |
| Andsar Property Limited | Real estate | 2025 |
| Andy Millward - Facialist Ltd | Other services | 2019 |
| Anglia Stairlifts (Midlands) Ltd | Other services | 2024 |
| ANK Trans Ltd | Administrative & support | 2016 |
| Annotations Contracting Ltd | Transport & logistics | 2016 |
| Ansa Door Systems Limited | Manufacturing | 2003 |
| Anything N Everything Limited | Wholesale & retail | 2025 |
| Anzh Ltd | Wholesale & retail | 2019 |
| AOA Psychology Limited | Health & social care | 2019 |
| AOF Properties Limited | Real estate | 2026 |
| AOK GAS Solutions Ltd | Construction | 2021 |
| Apex Aluminium Systems Limited | Construction | 2019 |
| Apex Cranes and Service Limited | Extraterritorial | 1985 |
| Apex Tire Response Ltd | Wholesale & retail | 2026 |
| APJ Moves Ltd | Transport & logistics | 2026 |
| Apogee Aviation Group Ltd | Professional & scientific | 2020 |
| Apollo Aerospace Components Limited | Transport & logistics | 1986 |
| Apollo Group Limited | Professional & scientific | 1986 |
| Approved Stairlifts Limited | Administrative & support | 2020 |
| Apricot Day Care Limited | Health & social care | 2022 |
| Aqualift Marine Limited | Manufacturing | 2020 |
| Aquarius Limited | Water & waste | 2008 |
| AR Management Solutions Limited | Hospitality | 2014 |
| AR7 Cricket Coaching Limited | Arts & recreation | 2025 |
| ARA Consulting Limited | Professional & scientific | 2010 |
| Arboretum Nursing Home Limited | Health & social care | 2008 |
| ARC Alloys Limited | Manufacturing | 1995 |
| ARC Wellness Group Ltd | Other services | 2026 |
| ARD99 Properties Limited | Real estate | 2021 |
| Arena Combat Archery Ltd | Arts & recreation | 2019 |
| ARP4 Limited | Arts & recreation | 2024 |
| Arrowvale Electronics Limited | Extraterritorial | 2018 |
| Arshya Construction Ltd | Construction | 2026 |
| Art Works Management Limited | Other services | 2017 |
| Art Works Providers Limited | Other services | 2022 |
| Arthur James Properties Ltd | Real estate | 2019 |
| Arthur Knowles Limited | Professional & scientific | 2005 |
| Artisan Brands Limited | Manufacturing | 2013 |
| ARW Trucking Ltd | Transport & logistics | 2015 |
| ARX Asset Management Limited | Real estate | 2023 |
| Asbbawinsongreen Limited | Arts & recreation | 2024 |
| Asbestos Surveying Services Limited | Professional & scientific | 2024 |
| Ascent Property Group Limited | Real estate | 2022 |
| Ascot Lily Investments Limited | Real estate | 2020 |
| ASG11 Property Limited | Real estate | 2021 |
| Ashi and Bros Ltd | Wholesale & retail | 2025 |
| Ashiyani Limited | Wholesale & retail | 2021 |
| Ashton RAE Ltd | Other services | 2020 |
| Asizar Limited | Real estate | 2022 |
| ASK2 Group Limited | Real estate | 2017 |