| Adia Management Solutions Ltd | Real estate | 2015 |
| Adly Properties Limited | Real estate | 2016 |
| ADM Structural Limited | Construction | 2009 |
| ADM Tax Limited | Professional & scientific | 2024 |
| ADP Investments Ltd | Wholesale & retail | 2021 |
| Adrian Charles Construction Limited | Construction | 2012 |
| Adriatic Properties Ltd | Real estate | 2025 |
| Advance Motor Service and Trading Ltd | Wholesale & retail | 2023 |
| Advance Planning Limited | Other services | 1996 |
| Advanced Glass Limited | Construction | 2011 |
| Advantage Vehicle Solutions Limited | Wholesale & retail | 2011 |
| Adventure Graphics Limited | Professional & scientific | 2009 |
| Adventure Soft Publishing Limited | Information & communication | 1998 |
| Advice Wise Ltd | Financial services | 2018 |
| Advocacy Matters Ltd | Health & social care | 2012 |
| AE Cleaning Limited | Administrative & support | 2022 |
| AE Electrics Ltd | Construction | 2021 |
| AEA Property Developers Ltd | Real estate | 2024 |
| Aegis Crest Protection Ltd | Administrative & support | 2026 |
| AEJ Pharma Ltd | Health & social care | 2026 |
| Aelius Energy Ltd | Construction | 2023 |
| Aero-Phil Ltd | Professional & scientific | 2022 |
| Aeroplas Holdings Ltd. | Real estate | 2000 |
| Aeshfern Limited | Professional & scientific | 2018 |
| Aesthedomhull Ltd | Administrative & support | 2020 |
| Aesthetic Housing Ltd | Real estate | 2025 |
| Aesthetic Wellness Club Limited | Arts & recreation | 2023 |
| AEV Conversions Ltd | Wholesale & retail | 2018 |
| AEW Associates Limited | Professional & scientific | 2007 |
| AF Optical Ltd | Health & social care | 2025 |
| Affiliate Wizard Limited | Administrative & support | 2009 |
| Affirm Pharmacy Locums Ltd | Administrative & support | 2019 |
| Afri Investments Limited | Real estate | 2022 |
| African Football Consult Limited | Professional & scientific | 2015 |
| Afrihealthcare Alliance Ltd | Health & social care | 2020 |
| Afsm Limited | Health & social care | 2024 |
| Afzal Estates 2 Ltd | Real estate | 2024 |
| Afzal Estates Ltd | Real estate | 2022 |
| Afzal Investments Ltd | Financial services | 2021 |
| AGE Concern in Birmingham Trading Limited | Wholesale & retail | 1994 |
| AGE Connects Britain Limited | Health & social care | 2011 |
| AGE Connects England Limited | Health & social care | 2012 |
| AGE Connects West Midlands | Health & social care | 1987 |
| Ageless Aesthetics Bham Ltd | Health & social care | 2023 |
| Agencyconnection Ltd | Administrative & support | 2021 |
| AGF Projects Limited | Information & communication | 2024 |
| Aggriwave Ltd | Professional & scientific | 2024 |
| AGJ Industrial Ltd | Professional & scientific | 2025 |
| AGM Procurement Limited | Other services | 2010 |
| AGP Estates Group Ltd | Real estate | 2025 |
| AGR Property Solutions Ltd | Real estate | 2025 |
| Agree Recruitment Group Ltd | Administrative & support | 2020 |
| Agri Technology Limited | Information & communication | 2025 |
| AGT Precast Ltd | Construction | 2025 |
| AH Care Consultancy Limited | Professional & scientific | 2020 |
| AH Golf Limited | Wholesale & retail | 2015 |
| AH Transfers Limited | Transport & logistics | 2018 |
| Ahic Homes Limited | Real estate | 2019 |
| Ahista Holdings Limited | Financial services | 2026 |
| Ahmad Fitpro Ltd | Other services | 2025 |
| Ahmose Gynaecology Ltd | Health & social care | 2024 |
| AHT Property Ltd | Real estate | 2020 |
| AHU Sales UK Limited | Manufacturing | 2005 |
| AI Change Limited | Information & communication | 2024 |
| Ai-Ifa Ltd | Information & communication | 2025 |
| Aiaaaa Ltd | Information & communication | 2025 |
| AIB (Sutton Coldfield UK) (Ccmcc) (C.O.A. UK) Limited | Extraterritorial | 2019 |
| Aikara Ltd | Health & social care | 2015 |
| AIM Protective Services Limited | Administrative & support | 2026 |
| Aimm Group Ltd | Administrative & support | 2019 |
| Aims Private Limited | Professional & scientific | 2019 |
| AIP Limited | Extraterritorial | 2007 |
| Air Conditioning Maintenance Consultancy LLP | | 2019 |
| Air Roofing Limited | Construction | 2014 |
| Aircon House Limited | Administrative & support | 2001 |
| Airconstruct (Midlands) Limited | Construction | 1975 |
| Airtech UK Limited | Energy | 1988 |
| AJ & C Homes Ltd | Real estate | 2024 |
| AJ & TJ Ltd | Real estate | 2024 |
| AJ Carriagemasters Ltd | Administrative & support | 2012 |
| AJ Interior Renovations Ltd | Construction | 2026 |
| AJ Marshall Consulting Limited | Information & communication | 2024 |
| AJ Removals Ltd | Transport & logistics | 2024 |
| AJ SHE Consultancy Ltd | Professional & scientific | 2024 |
| AJ Simkins Services Ltd | Construction | 2014 |
| AJ Vehicle Solutions Ltd | Administrative & support | 2012 |
| AJB Consulting Ltd | Wholesale & retail | 2024 |
| AJB Refrigeration Services Limited | Other services | 2018 |
| AJD Electrical Solutions Ltd | Construction | 2020 |
| AJJ Investments Limited | Financial services | 2017 |
| AJL Print Management Ltd | Manufacturing | 2007 |
| AJP Global Ltd | Arts & recreation | 2017 |
| AJP Heating & Plumbing Services Limited | Construction | 2003 |
| AJP Local Ltd | Real estate | 2020 |
| AJP Performance (Coaching) Limited | Health & social care | 2022 |
| Ajrp Sutton Ltd | Hospitality | 2019 |
| AJS Prop 1 Limited | Real estate | 2025 |
| AJS Property Rentals Limited | Real estate | 2023 |
| AJT Interiors Ltd | Construction | 2008 |
| AK Bathrooms Limited | Construction | 2026 |