| Ascara Ltd | Construction | 2019 |
| Ascot Pharmaceuticals Ltd | Wholesale & retail | 2021 |
| ASG Homes Ltd | Real estate | 2016 |
| ASG Polymers Ltd | Financial services | 2021 |
| ASG Properties Limited | Households | 2014 |
| Asha Devi IT Solutions Limited | Information & communication | 2015 |
| Ashburnham Management Limited | Professional & scientific | 2015 |
| Ashcroft Developments Limited | Real estate | 2002 |
| Ashdale Mews (West Bromwich) Management Company Limited | Households | 2007 |
| Ashen Consulting Ltd | Professional & scientific | 2015 |
| Ashen Holdings Ltd | Real estate | 2025 |
| Ashfield Transport Ltd | Transport & logistics | 2019 |
| Ashiana (Midlands) Limited | Hospitality | 2005 |
| Ashley Cowx Electrical Services Limited | Construction | 2023 |
| Ashmore Glass & Mirrors Limited | Manufacturing | 1997 |
| Ashton Plant Hire (Dudley) Limited | Manufacturing | 1952 |
| Ashton York Limited | Professional & scientific | 2009 |
| Ashworth Europe Limited | Manufacturing | 1994 |
| Ashworth/Beco Limited | Professional & scientific | 1993 |
| ASK CARE4YOU Ltd | Health & social care | 2025 |
| ASK Ideer Limited | Professional & scientific | 2026 |
| ASK Pharm Ltd | Wholesale & retail | 2022 |
| ASM Dream Properties Ltd | Real estate | 2024 |
| ASM Structures and Surveys Ltd | Professional & scientific | 2025 |
| Asmd Sport Limited | Arts & recreation | 2025 |
| ASN Medical Services Limited | Health & social care | 2010 |
| Asphalt Surfacing Solutions Ltd | Construction | 2025 |
| Aspire & Nurture Care Ltd | Health & social care | 2024 |
| Aspire Money Limited | Financial services | 2007 |
| Aspire Pathways Housing Ltd | Health & social care | 2025 |
| Aspire UK Care Limited | Education | 2026 |
| Aspreytech Holdings and Investments Ltd | Financial services | 2024 |
| Assero Auxilium Ltd | Extraterritorial | 2017 |
| Asset Engineering (2007) Limited | Manufacturing | 2007 |
| Asset Engineering Ltd | Manufacturing | 2009 |
| Associated Metalmasters Limited | Manufacturing | 2012 |
| Association of Welding Distribution Limited | Other services | 2010 |
| Assure Facilities Limited | Administrative & support | 2024 |
| Assure Motors Ltd | Wholesale & retail | 2025 |
| Assure Properties (Midlands) Limited | Real estate | 2024 |
| AST Motorsport Limited | Wholesale & retail | 2023 |
| Astewt Consultants Limited | Professional & scientific | 2024 |
| Astle Supplies Ltd | Wholesale & retail | 2021 |
| Astley Property Group Limited | Real estate | 2026 |
| Aston's Auctioneers & Valuers Limited | Wholesale & retail | 1989 |
| Astro Fire Systems Limited | Professional & scientific | 2021 |
| AT Racking Installations Ltd | Professional & scientific | 2025 |
| ATB World Limited | Information & communication | 2020 |
| Atherstone Chem Limited | Wholesale & retail | 2023 |
| Atkinson Bespoke Engineering Ltd | Wholesale & retail | 2010 |
| Atkinson Consultancy (West Midlands) Limited | Professional & scientific | 2024 |
| Atlanta (UK) Limited | Manufacturing | 1989 |
| Atlas Disposals Ltd | Wholesale & retail | 2024 |
| Atlas Metals Ltd | Other services | 2026 |
| Atlas Roofline and Construction Ltd | Construction | 2025 |
| Attingham Education Limited | Information & communication | 2020 |
| AU Appliances Ltd | Wholesale & retail | 2025 |
| Audenshaws (Oldbury) Limited | Water & waste | 2010 |
| Audnam Manufacturing Group Limited | Professional & scientific | 2008 |
| Audrami Ltd | Wholesale & retail | 2026 |
| Audtem Care Ltd | Hospitality | 2023 |
| Augustus Co Accountants Ltd | Professional & scientific | 2015 |
| Aura Medica Ltd | Health & social care | 2025 |
| Auras Crystals Ltd | Wholesale & retail | 2022 |
| Aureation Construction Ltd | Construction | 2017 |
| Aureation Developments Ltd | Extraterritorial | 2015 |
| Aureation Properties Ltd | Real estate | 2013 |
| Aureus Honey Ltd | Wholesale & retail | 2025 |
| Aureus Midlands (Holdings) Ltd | Financial services | 2025 |
| Aureus Payment Solutions Ltd | Administrative & support | 2025 |
| Auriga Properties Limited | Real estate | 1988 |
| Aurora Fire Protection Limited | Administrative & support | 2014 |
| Aurora Premium Quality Ltd | Transport & logistics | 2024 |
| Austellgrange Limited | Wholesale & retail | 1993 |
| Auto Styling Limited | Wholesale & retail | 2009 |
| Auto Styling Truckman Group Limited | Wholesale & retail | 2002 |
| Auto Styling U.K. Limited | Extraterritorial | 2017 |
| Autojack Ltd | Extraterritorial | 2016 |
| Autokraft Service Limited | Wholesale & retail | 2009 |
| Automated Manufacturing Consultants Limited | Administrative & support | 2012 |
| Automatic Rentals Limited | Administrative & support | 1993 |
| Automobilia Auctions Limited | Wholesale & retail | 2021 |
| Automotive 356 Ltd | Wholesale & retail | 2023 |
| Automotive&Investments Ltd | Wholesale & retail | 2022 |
| Autosport Bearings & Components Limited | Wholesale & retail | 1999 |
| Autostar Components Limited | Wholesale & retail | 2011 |
| Autoswift Ltd | Wholesale & retail | 2019 |
| Autotech Dudley Limited | Wholesale & retail | 2005 |
| Auxilium Consulting Limited | Professional & scientific | 2005 |
| AVA Care Group Ltd | Health & social care | 2024 |
| Aveline Threads Limited | Wholesale & retail | 2025 |
| Avender 247 Pharma Ltd | Wholesale & retail | 2025 |
| Avender Pharma Limited | Wholesale & retail | 2024 |
| Avicenna Supported Living Limited | Health & social care | 2022 |
| Avidell Consulting Limited | Professional & scientific | 2015 |
| Aviemore Properties Ltd | Real estate | 2020 |
| AVL Construction and Scaffolding Ltd | Construction | 2018 |
| AVL Holdings and Investments Ltd | Financial services | 2024 |
| Avlm Ltd | Construction | 2026 |
| Avyan Service Centre Ltd | Wholesale & retail | 2026 |