| AIE Property Holdings Limited | Real estate | 2025 |
| AIM CNC Ltd | Manufacturing | 2008 |
| Air Heat Services UK Ltd | Construction | 2026 |
| Air Scaffolding Limited | Construction | 1996 |
| Air Techno Limited | Administrative & support | 1995 |
| Airwright (Midlands) Ltd | Administrative & support | 2011 |
| AJ & T Holdings Ltd | Professional & scientific | 2026 |
| AJ Irrigation Ltd | Construction | 2024 |
| AJB (Midlands) Ltd | Construction | 2023 |
| AJB Motors Limited | Wholesale & retail | 2017 |
| AJC Wilkes Building Contractors Ltd | Construction | 2015 |
| AJH Business Finance Ltd | Financial services | 2021 |
| Ajrak Ltd | Health & social care | 2025 |
| AJW Carpentry & Building Limited | Construction | 2022 |
| AJW Landscapes and Fencing Ltd | Administrative & support | 2025 |
| AK Surface Solutions Ltd | Wholesale & retail | 2025 |
| AK2019 Ltd | Wholesale & retail | 2019 |
| AKA Music Limited | Other services | 2019 |
| Akhs Autos Ltd | Wholesale & retail | 2025 |
| Akpd Pipe Services Ltd | Construction | 2024 |
| Al-Hera Cupping Therapy Ltd | Health & social care | 2024 |
| Alan Bailes Consultancy Limited | Professional & scientific | 2020 |
| Alan Dean Systems Ltd | Professional & scientific | 2015 |
| Alandro Imports Ltd | Agriculture & fishing | 2025 |
| Alastair FRY Ltd | Health & social care | 2018 |
| Albert Dryliner Company Limited | Construction | 2017 |
| Alcapri Holdings Limited | Real estate | 1983 |
| Alcester Locks Limited | Administrative & support | 1999 |
| Alcester Locksmiths Limited | Administrative & support | 2007 |
| Alcester Storage Ltd | Transport & logistics | 2024 |
| Aleamet Ltd | Professional & scientific | 2013 |
| Aleena Capital Ltd | Real estate | 2024 |
| Alegna Business Finance Limited | Administrative & support | 2026 |
| Alex Baranowski Limited | Information & communication | 2014 |
| Alex Ispas Services Ltd | Transport & logistics | 2025 |
| Alex Nails and Spa Limited | Other services | 2022 |
| Alex Skinner Design Limited | Professional & scientific | 2014 |
| Alex T Smith Limited | Information & communication | 2014 |
| Alex&Dan Ltd | Construction | 2023 |
| Alial Transport Ltd | Transport & logistics | 2018 |
| Alignman.Co.Uk Limited | Wholesale & retail | 2026 |
| Alive Deliveries Ltd | Transport & logistics | 2019 |
| ALL Alliance Limited | Professional & scientific | 2008 |
| ALL Clear Environmental Services Ltd | Administrative & support | 2012 |
| ALL Cruises Limited | Administrative & support | 2005 |
| ALL for YOU Home Care Limited | Health & social care | 2017 |
| ALL for YOU Home Care London Limited | Health & social care | 2026 |
| ALL PVC Installations Limited | Construction | 2011 |
| ALL Things Clean Redditch Ltd | Administrative & support | 2025 |
| ALL Things Paddle Limited | Education | 2025 |
| Allian Design Limited | Administrative & support | 2009 |
| Alliance Brushes Limited | Manufacturing | 1993 |
| Alliance Seals Limited | Wholesale & retail | 1989 |
| Allianz Facilities Management Ltd | Wholesale & retail | 2025 |
| Allostery Home Care Ltd | Health & social care | 2025 |
| Alloygator Group Limited | Financial services | 2021 |
| Alloygator Limited | Manufacturing | 2007 |
| Allpinegreen Limited | Real estate | 2003 |
| Allstyle Engineering Limited | Administrative & support | 1996 |
| ALM Electrical Solutions Limited | Wholesale & retail | 2013 |
| Aloeda Limited | Other services | 2009 |
| Alpha Homes (Midlands) Ltd | Real estate | 2024 |
| Alpha of Redditch Ltd | Manufacturing | 2013 |
| Alpha Wolf Gym Wear Ltd | Wholesale & retail | 2023 |
| Alscot Architectural Associates Limited | Professional & scientific | 2014 |
| ALT Site Services Limited | Construction | 2017 |
| Alta Bioscience Limited | Manufacturing | 2010 |
| Alta Ritual Ltd | Arts & recreation | 2021 |
| Altara Software Limited | Information & communication | 2013 |
| Alternative Tying Systems Ltd | Wholesale & retail | 2013 |
| Alto Access Products Limited | Professional & scientific | 2017 |
| Altumera Ltd | Information & communication | 2026 |
| Altus Group Ltd | Manufacturing | 2001 |
| Amal Meeru Ltd | Wholesale & retail | 2025 |
| Amans Property Limited | Real estate | 2024 |
| Amateur Golf Tour Limited | Arts & recreation | 2013 |
| Amazioo Limited | Wholesale & retail | 2025 |
| AMB Trade Ltd | Hospitality | 2026 |
| Ambal Services Limited | Hospitality | 2026 |
| Ambassador Air Conditioning Ltd | Construction | 2014 |
| Amberwest Limited | Professional & scientific | 2002 |
| Ambient Energy Limited | Construction | 2025 |
| Ambient Engineering Solutions Limited | Administrative & support | 2017 |
| Ambient Water Treatment Limited | Water & waste | 2022 |
| AMC Carpentry Ltd | Construction | 2017 |
| American CUP Car Racing (UK) Ltd | Arts & recreation | 2009 |
| American Truck Shop Limited | Wholesale & retail | 2006 |
| Amethyst Gift Wrapping Limited | Wholesale & retail | 2020 |
| Amgx Ltd | Hospitality | 2025 |
| Ampcore Electrical Limited | Construction | 2024 |
| Ample Innovation Ltd | Other services | 2023 |
| Amplestone Limited | Real estate | 2026 |
| AMQ Engineering Ltd | Professional & scientific | 2020 |
| AMT Property Management & Services Ltd | Real estate | 2024 |
| Amy-Rose Photography Ltd | Professional & scientific | 2020 |
| Amybel Limited | Information & communication | 2002 |
| AMZ Logistics Ltd | Transport & logistics | 2024 |
| AMZ Transport Ltd | Transport & logistics | 2025 |
| AN Ride Limited | Transport & logistics | 2025 |
| Anays Transport Ltd | Transport & logistics | 2022 |