| Advanced Logic Analytics Holdings Limited | Other services | 2015 |
| Advanced Logic Analytics Limited | Other services | 2015 |
| Advanced Maintenance Services (West Midlands) Ltd | Administrative & support | 2014 |
| Advanced Podiatry Limited | Health & social care | 2015 |
| Advancement Online Limited | Professional & scientific | 2022 |
| Advanshield Limited | Professional & scientific | 2015 |
| Advantage Asbestos Consultants Ltd | Professional & scientific | 2023 |
| Advantage Asset Finance Ltd | Extraterritorial | 2008 |
| Advantage Creative C.I.C. | Financial services | 2003 |
| Advantage Direct Finance Limited | Extraterritorial | 2009 |
| Advantage Finance Limited | Financial services | 1999 |
| Advantage Motor Finance Limited | Extraterritorial | 1999 |
| Advantage Partner Finance Ltd | Extraterritorial | 2009 |
| ADVANTAGE4U Ltd | Extraterritorial | 2008 |
| Advantec Systems Limited | Information & communication | 1979 |
| Advertising Matters Limited | Professional & scientific | 1986 |
| Advest Capital Management Limited | Administrative & support | 2015 |
| AE Extension Specialists Limited | Construction | 2022 |
| Aeer Properties Ltd | Real estate | 2026 |
| Aegle Medical Limited | Health & social care | 2017 |
| Aeiforo Limited | Information & communication | 2024 |
| Aequus Auctions Limited | Real estate | 2011 |
| Aero Solutions Limited | Professional & scientific | 2026 |
| AES Technology Services Limited | Professional & scientific | 2007 |
| Aesthetics Limited | Other services | 2007 |
| AEZ Family Holdings Limited | Professional & scientific | 2018 |
| AEZ Family Limited | Real estate | 2018 |
| AF Aylesbury Limited | Wholesale & retail | 2020 |
| AF Training Private Limited | Education | 2024 |
| AFA Al-Bakri Ltd | Health & social care | 2012 |
| AFA Health Ltd | Health & social care | 2023 |
| AFB Garden Maintenance Ltd | Arts & recreation | 2025 |
| AFC Crawley Town Ltd | Arts & recreation | 2023 |
| AFC Solihull Community Interest Company | Arts & recreation | 2024 |
| Affiner Ltd | Professional & scientific | 2024 |
| Affordable Lettings Limited | Real estate | 2017 |
| Affscanner Ltd | Other services | 2018 |
| Afin Farming Ltd | Agriculture & fishing | 2022 |
| AFM Construction Ltd | Administrative & support | 2016 |
| AFM Consultancy Services Ltd | Professional & scientific | 2018 |
| Afong Consulting Ltd | Health & social care | 2015 |
| Afro Nature Ltd | Wholesale & retail | 2023 |
| Aftab Business House Ltd | Wholesale & retail | 2024 |
| Aftab Rashid Ltd | Professional & scientific | 2025 |
| Aftershow Ltd | Arts & recreation | 2025 |
| AG Architecture Limited | Professional & scientific | 2011 |
| Agastia Limited | Manufacturing | 2020 |
| AGE Concern Solihull | Health & social care | 1996 |
| AGE Concern Solihull Trading Limited | Financial services | 1994 |
| AGE With Pride Community Interest Company | Other services | 2016 |
| Agent Checker Ltd | Information & communication | 2024 |
| Aggarwal Properties Ltd | Real estate | 2024 |
| Agile CLS Limited | Professional & scientific | 2016 |
| AGK Imaging Limited | Health & social care | 2012 |
| Agnar Consult Ltd | Health & social care | 2014 |
| Agni Electrical Systems Ltd | Construction | 2020 |
| Agricultural Drainage & Tank Supplies Ltd | Administrative & support | 2011 |
| AGS Electrical Contractors Ltd | Construction | 2019 |
| AGS Technical Solutions Ltd | Administrative & support | 2009 |
| Agsp (Solihull) Limited | Health & social care | 2026 |
| AH & AM Limited | Wholesale & retail | 2023 |
| AH & LH Properties Limited | Real estate | 2020 |
| AH Advisory Limited | Professional & scientific | 2017 |
| AH Auto Motor Repairs Ltd | Wholesale & retail | 2025 |
| AH Autos Limited | Manufacturing | 2018 |
| AH Medics Limited | Health & social care | 2019 |
| Ah&F Services Ltd | Real estate | 2018 |
| AHF Carpentry & Joinery Services Ltd | Construction | 2025 |
| Ahiru Ltd | Real estate | 2025 |
| AHL Group Ltd | Real estate | 2024 |
| Ahlrnt Limited | Professional & scientific | 2025 |
| Ahmed Pathology Services Ltd | Health & social care | 2025 |
| Ahoy Lettings Ltd | Real estate | 2019 |
| AHP Trader Limited | Wholesale & retail | 2025 |
| AHZ Consultancy Ltd | Professional & scientific | 2025 |
| AI Agility Limited | Information & communication | 2025 |
| AI Factories Ltd | Manufacturing | 2019 |
| AI MED Services Ltd | Health & social care | 2025 |
| AI Properties (Midlands) Limited | Real estate | 2023 |
| AI Sports Development Limited | Arts & recreation | 2024 |
| AID Fund Ltd | Health & social care | 2019 |
| Aignis Consultancy Ltd | Information & communication | 2026 |
| Ailes Mortgage Solutions Ltd | Financial services | 2020 |
| Ainge & Nicholls Heating Limited | Construction | 2002 |
| Ainsworth Construction Limited | Construction | 2012 |
| Air Fine Art Ltd | Extraterritorial | 2021 |
| Air on Board UK Limited | Wholesale & retail | 2023 |
| AIR2CAMBRIDGE Ltd | Construction | 2022 |
| AIR2ELECTRICAL Ltd | Construction | 2022 |
| AIR2HIRE Limited | Wholesale & retail | 1996 |
| Airee Fairee Limited | Wholesale & retail | 2013 |
| Aireis Limited | Professional & scientific | 2021 |
| Airforce 1 Limited | Construction | 2007 |
| Airline Connect Transport Services Ltd | Transport & logistics | 2022 |
| Airohealth Limited | Information & communication | 2025 |
| Airpark Operations Limited | Transport & logistics | 2025 |
| Airport Lodge Ltd | Hospitality | 2025 |
| Airport Transfer Birmingham Ltd | Transport & logistics | 2023 |
| Airport Transport Specialists Limited | Transport & logistics | 2024 |
| Airport Vehicle Spares Company Limited | Wholesale & retail | 2002 |