| Ace and Grace Limited | Wholesale & retail | 2025 |
| Ace Management Solutions Ltd | Professional & scientific | 2025 |
| Acemech Mechanical Services Limited | Construction | 2016 |
| ACH Plasticom Ltd | Professional & scientific | 2016 |
| Acip Digital Ltd | Information & communication | 2020 |
| Acocks Village Foods Limited | Hospitality | 2024 |
| Acorn Interim Management Limited | Real estate | 2007 |
| ACR Makeovers Limited | Construction | 2019 |
| Acrosswater Limited | Professional & scientific | 1996 |
| Action Indoor Sports Birmingham CIC | Arts & recreation | 2014 |
| Action Indoor Sports Ltd | Professional & scientific | 2009 |
| Active Crew Limited | Arts & recreation | 2024 |
| Active KIT Supplies Ltd | Arts & recreation | 2025 |
| Acton Court Ltd | Real estate | 2004 |
| Actual People Development Ltd | Other services | 2009 |
| Acuity Financial Consultancy Limited | Financial services | 2003 |
| AD Davies Property Limited | Real estate | 2019 |
| Adam Taxi Services Ltd | Transport & logistics | 2024 |
| Adamdene Limited | Real estate | 1988 |
| Adams Fruits Limited | Wholesale & retail | 2017 |
| Adaptable Medical Services Ltd | Information & communication | 2019 |
| Adcam Fabrications Limited | Manufacturing | 2006 |
| Adcock Solutions Limited | Administrative & support | 2019 |
| Adcocks (Holdings) Limited | Professional & scientific | 2024 |
| Adcocks Trustee Company Limited | Extraterritorial | 2019 |
| Addlington-West Group Ltd | Professional & scientific | 2018 |
| Adept Central Limited | Administrative & support | 2017 |
| ADL Construction & Demolition Services Ltd | Construction | 2008 |
| ADR Training Ltd | Education | 2025 |
| Adriana Health Ltd | Public administration | 2018 |
| Adrianne Carter Ltd | Professional & scientific | 2019 |
| Adroit Management Group Limited | Professional & scientific | 2002 |
| Adroit Management Services Limited | Professional & scientific | 2006 |
| Adroit Project Management Limited | Professional & scientific | 2006 |
| Advance the Disability Consultants Ltd | Professional & scientific | 2025 |
| Advanced Innovative Engineering (UK) Limited | Manufacturing | 2012 |
| Advanced Innovative Investments Limited | Professional & scientific | 2015 |
| Advanced Innovative Manufacturing Limited | Manufacturing | 2020 |
| Advanced Technical Welding Limited | Professional & scientific | 2002 |
| Advantage Motor Group Limited | Professional & scientific | 2006 |
| Advantage Through Service Limited | Professional & scientific | 2003 |
| ADW Brickwork Limited | Construction | 2023 |
| Aegis Quality Associates Ltd | Other services | 2023 |
| Aeniar Ltd | Transport & logistics | 2019 |
| Aeris Helicopters Ltd | Transport & logistics | 2021 |
| AES Lichfield Ltd | Construction | 2009 |
| Aesthetex Supplies Limited | Extraterritorial | 2022 |
| AF Brickworks Limited | Construction | 2021 |
| Affinitus Group Limited | Information & communication | 1991 |
| Affinity Professional Services Limited | Professional & scientific | 2010 |
| AFL Pubs Ltd | Hospitality | 2025 |
| African Heritage Food Solutions Limited | Wholesale & retail | 2025 |
| Ag&Zw Ltd | Wholesale & retail | 2025 |
| AGC Asset Developments Limited | Real estate | 2016 |
| AGE Well Naturals Ltd | Wholesale & retail | 2025 |
| Agent One (Birmingham) Limited | Wholesale & retail | 2004 |
| AGL Realty Limited | Households | 2025 |
| Agrial Fresh Farms Ltd | Agriculture & fishing | 2013 |
| Agrial Fresh Produce Ltd | Manufacturing | 1998 |
| Agrotenet Limited | Wholesale & retail | 2018 |
| AH1 Transport Limited | Transport & logistics | 2019 |
| AHL Takeaway Ltd | Hospitality | 2020 |
| Ahtohallan Limited | Professional & scientific | 2024 |
| Ai-Priori Ltd | Information & communication | 2020 |
| AIM Change Management Limited | Administrative & support | 2016 |
| Aimtrans Ltd | Transport & logistics | 2016 |
| Ainges Asset Holdings Limited | Professional & scientific | 2013 |
| Aircon West Midlands Limited | Construction | 2025 |
| Aisle 19 Solutions Limited | Wholesale & retail | 2018 |
| AJ & WS Millis Technical Services Ltd | Professional & scientific | 2022 |
| AJ Enthusiasts Ltd | Wholesale & retail | 2026 |
| AJA Couriers Ltd | Transport & logistics | 2021 |
| AJB Transport Solutions Ltd | Transport & logistics | 2018 |
| Ajdb Limited | Professional & scientific | 2018 |
| Ajfs Holdings Ltd | Financial services | 2020 |
| AJM Medical Limited | Health & social care | 2010 |
| AJN Construction (Derby) Limited | Construction | 2018 |
| AJR Electrical Services Ltd | Construction | 2001 |
| AJS Sales Ltd | Wholesale & retail | 2026 |
| AK Business Productions Ltd | Other services | 2019 |
| AK Romanza Limited | Wholesale & retail | 2020 |
| AKE Investments Ltd | Real estate | 2019 |
| Albany Terrace Management (2000) Ltd | Households | 2000 |
| Albany Vale Estates Limited | Real estate | 1973 |
| Aldershawe Management Limited | Households | 1998 |
| Alert Piling Limited | Extraterritorial | 2011 |
| Alert Piling Solutions Limited | Construction | 2009 |
| Alex Jones Business Consultancy Ltd | Administrative & support | 2024 |
| Alex Stockton Golf Ltd | Wholesale & retail | 2025 |
| Alexandra Gladstone Holdings Ltd | Financial services | 2024 |
| Alexima Ltd | Health & social care | 2014 |
| Alfauld Properties Limited | Real estate | 2015 |
| Alison Readman Consultancy Services Limited | Professional & scientific | 2019 |
| Alka Management Ltd | Professional & scientific | 2018 |
| ALL Floors 4 Ltd | Wholesale & retail | 2011 |
| ALL Moto Services Limited | Transport & logistics | 2019 |
| ALL Star Education Ltd | Education | 2017 |
| All-Fit Towbars & Trailers Limited | Wholesale & retail | 2007 |
| Allan James Financial Services Limited | Professional & scientific | 2012 |
| Allen Properties (Cannock) Limited | Real estate | 2006 |