| Albrighton House Management Company Limited | Households | 2010 |
| ALC Property Services Ltd | Real estate | 2023 |
| Alderwood Medical Practice GPF Limited | Extraterritorial | 2018 |
| Aldridge Air Conditioning Limited | Construction | 2013 |
| Aldridge Building Services Ltd | Construction | 2018 |
| Aldridge Civil Engineering Ltd | Construction | 2019 |
| Ales. R. Russ Limited | Wholesale & retail | 2010 |
| Alex Hearn Construction Limited | Construction | 2021 |
| Alexander Aviation Ltd | Manufacturing | 2017 |
| Alexander Brothers 1968 Limited | Other services | 2022 |
| Alexander Brothers Holdings Limited | Financial services | 2024 |
| Alexander Hearn Holdings Limited | Financial services | 2021 |
| Alexander Hearn Investments Limited | Real estate | 2020 |
| Alexander Hearn Team Limited | Professional & scientific | 2012 |
| Alfa UK Foods Limited | Wholesale & retail | 2017 |
| ALG Property Investments Ltd | Real estate | 2025 |
| Alignment Contractors Ltd | Construction | 2025 |
| ALL Plumb Limited | Construction | 2023 |
| ALL Print Equipment Ltd | Manufacturing | 2009 |
| ALL Star Driving School Limited | Education | 2019 |
| ALL Together Beauty Ltd | Other services | 2024 |
| All-Tech Consultants Limited | Administrative & support | 2006 |
| Allcheck Inspection & Testing Limited | Administrative & support | 2017 |
| Allcutt Scaffolding Limited | Construction | 2017 |
| Allgroup Holdings Limited | Financial services | 2023 |
| Allgroup LLP | | 2009 |
| Allgroup Packaging Holdings Limited | Financial services | 2024 |
| Alliance Executive Consultancy Services Ltd | Administrative & support | 2018 |
| Allied Pacific Holdings Ltd | Financial services | 2021 |
| Alloy Wheel Equipment Ltd | Professional & scientific | 2023 |
| Allpack Limited | Administrative & support | 2009 |
| Allpack Packaging Limited | Administrative & support | 2013 |
| Allport Refrigeration Ltd | Construction | 2024 |
| Almond Hill Holdings Ltd | Financial services | 2021 |
| Almond Oak Developments Ltd | Real estate | 2026 |
| Alpha Car Care Ltd | Wholesale & retail | 2019 |
| Alpha Fire Services Limited | Public administration | 2024 |
| Alpha Midas Ltd | Other services | 2015 |
| Alpha Optima Limited | Other services | 2020 |
| Alpha Training Academy UK Ltd | Education | 2017 |
| Alpine M & E Holdings Limited | Construction | 2019 |
| ALPINE4CARE Services Ltd | Health & social care | 2022 |
| Alternative Equity Limited | Professional & scientific | 2023 |
| Alternative Equity Two Limited | Professional & scientific | 2024 |
| Alternative Sales Limited | Administrative & support | 2026 |
| Alterplex Limited | Construction | 2024 |
| Alto Renovations Ltd | Construction | 2023 |
| Aluna Interiors Limited | Manufacturing | 2022 |
| Alutec UK Limited | Manufacturing | 1995 |
| Alvari Ltd | Other services | 2008 |
| Alvvar Digital Services Limited | Manufacturing | 2014 |
| Amanat Ltd | Administrative & support | 2019 |
| Amateur Motor Cycle Association Benevolent Fund | Arts & recreation | 2009 |
| Amateur Motor Cycle Association Limited | Arts & recreation | 1983 |
| Amaya Indian Takeaway Limited | Hospitality | 2019 |
| Amba Heat Limited | Construction | 2006 |
| Amba Technologies Limited | Professional & scientific | 2018 |
| Ambient Night Productions Limited | Arts & recreation | 2017 |
| Ambrose Carpentry Limited | Manufacturing | 2023 |
| Amca Developments Limited | Other services | 2005 |
| Amca Events Limited | Arts & recreation | 2005 |
| AMG Property Services Ltd | Professional & scientific | 2019 |
| AMI Automation Ltd | Professional & scientific | 2025 |
| Amigo Limited | | 1981 |
| Amlex Contractors Ltd | Construction | 2018 |
| AMM Haulage Ltd | Transport & logistics | 2025 |
| AMP Estates Limited | Real estate | 2009 |
| AMP Midlands Limited | Construction | 2016 |
| AMR Civils Ltd | Construction | 2023 |
| AMS Electrical Installations (Midlands) Ltd | Construction | 2026 |
| AMW Driveways Limited | Construction | 2023 |
| AMW Equipment Hire Limited | Administrative & support | 2023 |
| AMW Property Management Ltd | Real estate | 2023 |
| AMW Surfacing Ltd | Construction | 2018 |
| Amwholesalers Ltd | Wholesale & retail | 2026 |
| Anavic Ltd | Arts & recreation | 2019 |
| Anchor Estates (BW) Limited | Real estate | 2016 |
| Andersons Gold & Silver Bullion Limited | Wholesale & retail | 2025 |
| Andrew Dixon (Cannock) Ltd | Real estate | 1996 |
| Andrew Tilan & Associates Ltd | Professional & scientific | 2013 |
| Andrews Telecomms Ltd | Construction | 2022 |
| Andy Flynn Brickworks Holdings Limited | Financial services | 2016 |
| Andy Flynn Brickworks Limited | Construction | 2001 |
| Andy Murphy Transport Ltd | Extraterritorial | 2020 |
| ANG Property Alliance Ltd | Real estate | 2025 |
| Angel Heating & Plumbing Limited | Construction | 2002 |
| Angelo Services Limited | Wholesale & retail | 1995 |
| Anglesey Court Development Company Limited | Households | 1989 |
| Anglesey Estates (Hednesford) Limited | Real estate | 1992 |
| Anglesey Estates Bridgtown Limited | Real estate | 1975 |
| Anglesey Estates Limited | Real estate | 1992 |
| Anglesey Group Estates Limited | Real estate | 1967 |
| Anglesley Farms (Staffs) Limited | Real estate | 1995 |
| Anglo-Hungarian Trading Co. Ltd | Wholesale & retail | 2020 |
| ANK Cleaning Services Ltd | Administrative & support | 2025 |
| Annie Mcandrew Ltd | Agriculture & fishing | 2024 |
| Ansa Express Ltd | Transport & logistics | 2019 |
| Ansell-Munden Associates Limited | Professional & scientific | 2008 |
| Antalya Barber Cannock Ltd | Other services | 2026 |
| Anthony Webb & SON Limited | Other services | 2007 |