| Antony Brothers Real Estate Ltd | Real estate | 2024 |
| Anty Limited | Health & social care | 2019 |
| Anup Ltd | Transport & logistics | 2024 |
| Anusha Medical Consultancy Ltd | Health & social care | 2019 |
| Apcl Group Limited | Professional & scientific | 2021 |
| Apex Wirral Ltd | Health & social care | 2025 |
| Apex-Elite Properties Limited | Real estate | 2024 |
| Apexclean Solutions Limited | Administrative & support | 2026 |
| Apollo Care (Wirral) Ltd | Health & social care | 2012 |
| Apollo Watches Ltd | Wholesale & retail | 2026 |
| Approved Construction Ltd | Construction | 2019 |
| APT (Wirral) Limited | Real estate | 2005 |
| Aqua Tech Bathroom & Heating Ltd | Construction | 2025 |
| Aquafinish Ltd | Administrative & support | 2025 |
| Aquannah Ltd | Manufacturing | 2025 |
| Aquatherm Plumbing and Heating(Nw) Limited | Construction | 2018 |
| Arcis Bricks Limited | Manufacturing | 2025 |
| Arctic GAS Solutions Ltd | Construction | 2020 |
| Ardent Utilities Ltd | Construction | 2018 |
| Arecomp Limited | Construction | 2018 |
| Arena Windows (Upvc) Ltd | Manufacturing | 2015 |
| Argyle Eats Collective Ltd | Hospitality | 2026 |
| Argyle News UK Ltd | Wholesale & retail | 2023 |
| Argyle UK Trading Ltd | Wholesale & retail | 2018 |
| Argyle Upvc Limited | Construction | 2009 |
| Arion Engineering Ltd | Manufacturing | 2007 |
| ARK Commercial Transport Limited | Administrative & support | 2012 |
| ARK Community Payroll Limited | Extraterritorial | 2014 |
| ARK Community Transport Ltd | Transport & logistics | 2009 |
| Armadillo Victoria Ltd | Hospitality | 2020 |
| Armitech Limited | Construction | 2001 |
| Armstrong Laing Group Limited | Information & communication | 2024 |
| Arnia Investment Company | Financial services | 2022 |
| Arno and North Coast LLP | | 2022 |
| Arnould's Gym & Fitness Limited | Arts & recreation | 2020 |
| Art on Demand Ltd | Information & communication | 2020 |
| Art ZAM ZAM Limited | Hospitality | 2025 |
| Artistic Avenue Ltd | Wholesale & retail | 2023 |
| Arviga Ltd | Wholesale & retail | 2025 |
| Asav Fitness Ltd | Other services | 2019 |
| Asgrm Limited | Construction | 2019 |
| Asguard Security Group Ltd | Financial services | 2024 |
| ASH Tree Leisure Limited | Other services | 2017 |
| Ashburton Guest House Wirral Limited | Hospitality | 2011 |
| Asiya Tandoori House Limited | Hospitality | 2024 |
| Asma & Co Ltd | Professional & scientific | 2011 |
| Aspect Eco Homes Limited | Construction | 2014 |
| Aspipeweldingservices Ltd | Professional & scientific | 2025 |
| Aspire Care Support Services Ltd | Health & social care | 2011 |
| Athena (NW) Limited | Administrative & support | 2017 |
| Athena Luxe Limited | Wholesale & retail | 2019 |
| Athena Safety Services Ltd | Professional & scientific | 2017 |
| Atherton Property Developments Limited | Real estate | 2017 |
| Athula LK Ltd | Hospitality | 2025 |
| Atlantic House Developments (NW) Limited | Real estate | 2020 |
| Atlas Fire & Security Limited | Manufacturing | 1993 |
| Atlas LY Ltd | Construction | 2025 |
| Atlas Security Patrol Limited | Extraterritorial | 2014 |
| Atlon Composites UK Limited | Administrative & support | 2025 |
| Atomitech Ltd | Professional & scientific | 2020 |
| ATV Retail Ltd | Wholesale & retail | 2026 |
| Aurora LD Limited | Health & social care | 2016 |
| Autocad Ltd | Manufacturing | 2023 |
| Autofix (GB) Limited | Wholesale & retail | 2005 |
| Autopilot GMS Limited | Information & communication | 2026 |
| Autumnscreen Limited | Real estate | 2000 |
| AVW Electrical (North West) Limited | Construction | 2012 |
| Ayad Indian Takeaway Ltd | Hospitality | 2026 |
| Ayemel Construction Limited | Construction | 2020 |
| Ayemel Properties Limited | Construction | 2016 |
| Aysha Fashion (Wirral) Ltd | Wholesale & retail | 2022 |
| Azmar Barber Birkenhead Ltd | Other services | 2025 |
| Azmar Barber Shop Ltd | Other services | 2024 |
| B.C.S.Holdings Limited | Real estate | 1958 |
| B.M.B. Industrial Cabs Limited | Manufacturing | 1999 |
| Babo Holdings Ltd | Other services | 2021 |
| Babsfilm Limited | Real estate | 1981 |
| Back in Time Games Limited | Wholesale & retail | 2026 |
| Bailey Properties Ltd | Real estate | 2022 |
| Bairan UK Ltd | Administrative & support | 2017 |
| Baked .EST21 Limited | Hospitality | 2021 |
| Baked EST21 CHAPTER2 Ltd | Hospitality | 2024 |
| Balabala Limited | Wholesale & retail | 2024 |
| Baldwin-Brown G Limited | Wholesale & retail | 2010 |
| Balls Road Dental Practice Ltd | Health & social care | 2024 |
| Balquharn Asset Management Limited | Construction | 2019 |
| Baltic Fleet Brewery Limited | Manufacturing | 2010 |
| Bamboo Estates LLP | | 2016 |
| Bamford Medical Services Ltd | Health & social care | 2021 |
| Bananas Group Limited | Arts & recreation | 2015 |
| Bandura Limited | Wholesale & retail | 2020 |
| Bangla Bazaar Wirral Limited | Wholesale & retail | 2012 |
| Bar Signature Limited | Hospitality | 2015 |
| Baran Shave Ltd | Other services | 2026 |
| Barerooms Limited | Arts & recreation | 2021 |
| Barleyfield (Pensby) Management Company Limited | Real estate | 2018 |
| Barry J Fogg Electrical Services Ltd | Construction | 2007 |
| Bartek Pawlak Trans Ltd | Transport & logistics | 2019 |
| BASE3 Limited | Information & communication | 2026 |
| Bash-P International Ltd | Extraterritorial | 2002 |