| Alam Investment Group Limited | Information & communication | 2026 |
| Albion Oak Ltd | Construction | 2022 |
| Albion Scaffolding Limited | Construction | 2016 |
| Albion Tower Properties Limited | Real estate | 1983 |
| Albrighton Woodland Limited | Health & social care | 2020 |
| Alcamico Ltd | Transport & logistics | 2024 |
| Alder Real Estate UK Ltd | Financial services | 2025 |
| Alder Workspace Ltd | Real estate | 2025 |
| Aldridge Holdings & Investments Ltd | Financial services | 2025 |
| Aleah Holdings and Investments Ltd | Financial services | 2025 |
| Aleah Properties Ltd | Real estate | 2025 |
| Alekkk Express Limited | Transport & logistics | 2017 |
| Alesha-Arham Ltd | Other services | 2021 |
| Aleu&Co Ltd | Wholesale & retail | 2022 |
| Alex & Clement Limited | Manufacturing | 2020 |
| Alex French Holdings Ltd | Financial services | 2023 |
| Alex Hickman SPV Ltd | Professional & scientific | 2018 |
| Alex James Law Ltd | Professional & scientific | 2018 |
| Alexandra Court (Oldbury) Limited | Real estate | 2014 |
| Alexandra Court Management (Dudley) Limited | Households | 1985 |
| Alexandra Park (Tipton) Management Company Limited | Households | 2003 |
| Alexandru Berezanski Ltd | Transport & logistics | 2019 |
| Alexiecatalin Transport Ltd | Transport & logistics | 2025 |
| Alfa Focus Ltd | Administrative & support | 2025 |
| Alia Business Limited | Wholesale & retail | 2024 |
| ALL Green VEG Ltd | Wholesale & retail | 2026 |
| ALL Homes Holdings and Investments Ltd | Financial services | 2025 |
| ALL Logistics Solutions Ltd | Transport & logistics | 2011 |
| ALL Welcome Housing Ltd | Real estate | 2024 |
| ALL4SALE Limited | Administrative & support | 2015 |
| Alliance Doors Limited | Manufacturing | 2018 |
| Alliance for Care Ltd | Extraterritorial | 2018 |
| Alliance Industrial Doors Limited | Manufacturing | 1999 |
| Alliance of Private Sector Practitioners Limited | Other services | 2002 |
| Allied Dominion Limited | Transport & logistics | 1996 |
| Allison Plumbing and Heating Limited | Construction | 2025 |
| Allwood Joiners Ltd | Manufacturing | 2005 |
| Alma Valeting Ltd | Other services | 2019 |
| Almace Ltd | Wholesale & retail | 2026 |
| ALP Systems Ltd | Professional & scientific | 2014 |
| Alpha Products Direct Ltd | Wholesale & retail | 2026 |
| Alps Homes Highley Ltd | Construction | 2023 |
| Alps Homes Himley Ltd | Construction | 2024 |
| Alps Homes Netherton Ltd | Construction | 2026 |
| Alps Mere Green Ltd | Real estate | 2025 |
| Alrajo Barbers Ltd | Other services | 2022 |
| Alternative Provisions Ltd | Education | 2025 |
| Alvaro Trade Deal Ltd | Wholesale & retail | 2025 |
| Always Hvac Limited | Construction | 2014 |
| Alym'Pic' Locksmiths & Carpentry Ltd | Construction | 2009 |
| Alyson Sayers Safeguarding Ltd | Education | 2017 |
| AM Bocian Ltd | Transport & logistics | 2021 |
| AM Brickwork (Midlands) Ltd | Construction | 2017 |
| AM Pipework and Welding Ltd | Manufacturing | 2015 |
| AM Rainbow Properties Ltd | Real estate | 2025 |
| AM to PM Transport Ltd | Transport & logistics | 2026 |
| Amaan 6 Ltd | Wholesale & retail | 2025 |
| Amaan 7 Supermarket Ltd | Wholesale & retail | 2025 |
| Amap Ltd | Professional & scientific | 2006 |
| Amarine Limited | Real estate | 2024 |
| Amaris Staffing and Care Ltd | Health & social care | 2026 |
| Amazon Gold Limited | Wholesale & retail | 2003 |
| Amber Financial Advice Limited | Financial services | 2014 |
| Amber Property Midlands Ltd | Real estate | 2023 |
| Ambition Homes Limited | Health & social care | 2026 |
| Ambition HR Ltd | Administrative & support | 2023 |
| Amblecote Valeting Centre Ltd | Other services | 2021 |
| Ambulance & Funeral Equipment Testing Ltd | Professional & scientific | 2019 |
| Ambuskill Limited | Transport & logistics | 1988 |
| AMD2GO Limited | Transport & logistics | 2021 |
| Amelia’S Dessert Ltd | Manufacturing | 2025 |
| Amfabs (West Midlands) Limited | Manufacturing | 2011 |
| Amir-Baz Education Consultancy Ltd | Education | 2022 |
| Amiree Super Store Limited | Wholesale & retail | 2025 |
| AML Dispute Resolution Ltd | Professional & scientific | 2019 |
| AMMAR23 Mart Ltd | Wholesale & retail | 2025 |
| Amos Air Conditioning Ltd | Construction | 2024 |
| AMP Flooring Ltd | Construction | 2020 |
| Amphion Construction Limited | Construction | 2004 |
| Amphion Court Management Company Limited | Administrative & support | 2005 |
| Ampteam Limited | Manufacturing | 1990 |
| AMS Capital Investments Ltd | Construction | 2019 |
| Amsash Ltd | Professional & scientific | 2018 |
| AMT INT Limited | Real estate | 2013 |
| AMW Builders Limited | Construction | 2015 |
| Amway Property Services Ltd. | Construction | 2017 |
| Amy's Delight Limited | Hospitality | 2024 |
| Amzpro Consulting Ltd | Professional & scientific | 2024 |
| Anchor Customs Limited | Wholesale & retail | 2023 |
| Anchorhold Estates Ltd | Real estate | 2026 |
| Andersons Cars Ltd | Wholesale & retail | 2024 |
| Andotrius Ltd | Administrative & support | 2019 |
| Andrei Limited Limited | Transport & logistics | 2016 |
| Andrew Hall Construction Services Limited | Construction | 2015 |
| Andrew Ouche Consult Ltd | Professional & scientific | 2021 |
| Andrew Poole Antiques & Interiors Limited | Wholesale & retail | 2003 |
| Andrew Totney Developments Limited | Construction | 2013 |
| Andrew Whitlock Racing Ltd | Arts & recreation | 2013 |
| Andrews Facilities Management Ltd | Administrative & support | 2013 |
| Andrius Express Limited | Transport & logistics | 2015 |