| ALL Things Clear Ltd | Administrative & support | 2025 |
| Allcare Community Care Services Trafford Limited | Health & social care | 2014 |
| Allcare Staffing Limited | Administrative & support | 2025 |
| Allen Build Northwest Ltd | Construction | 2022 |
| Allen Psychology Limited | Health & social care | 2021 |
| Allergy Diets Ltd | Health & social care | 2015 |
| Alliance Build NW Ltd | Administrative & support | 2024 |
| Alliance Facilities Management Limited | Water & waste | 2011 |
| Alliance Rentals Limited | Real estate | 2017 |
| Allinclusive U Limited | Health & social care | 2025 |
| Allintus Limited | Professional & scientific | 2008 |
| ALLOC8 Tickets Limited | Information & communication | 2019 |
| Allport Carpets & Flooring Limited | Construction | 2017 |
| Alltech Ltd | Construction | 2021 |
| ALM Drive 2 Pass Ltd | Education | 2018 |
| ALM Sales Ltd | Wholesale & retail | 2021 |
| Alma Court (Southport) Limited | Households | 1974 |
| Alma Intercultural Centre C.I.C. | Education | 2025 |
| Almari Adorn Limited | Wholesale & retail | 2023 |
| Almaroca Ltd | Information & communication | 2006 |
| Almas Property Investment Ltd | Real estate | 2025 |
| Almc Software Limited | Information & communication | 2011 |
| Alpha and Omega Labs UK Limited | Professional & scientific | 2026 |
| Alpha Funding Limited | Financial services | 2021 |
| Alpha Holding NW Ltd | Real estate | 2026 |
| Alpha Office Limited | Administrative & support | 2019 |
| Alpha Recordings Limited | Wholesale & retail | 2016 |
| Alpha Securities Ltd | Real estate | 2024 |
| Alpha Supr Medical Ltd | Wholesale & retail | 2026 |
| Alpine Property North West Ltd | Real estate | 2026 |
| Alpine Water Coolers Ltd | Wholesale & retail | 2018 |
| Alter Installation Services Ltd | Manufacturing | 2025 |
| Alternative Building Control Solutions Limited | Professional & scientific | 2001 |
| Alternative Therapies Ltd | Health & social care | 2025 |
| Alton Road (Wallasey) Management Co. Limited | Households | 1987 |
| Aludoor Ltd | Manufacturing | 2006 |
| Alutec Installations Limited | Construction | 2008 |
| ALW Marketing Consultancy Limited | Professional & scientific | 2022 |
| Amacr Ltd | Real estate | 2018 |
| Amandarosie Limited | Health & social care | 2021 |
| Amanzi Utilities Limited | Wholesale & retail | 2014 |
| Amari Developments NW Ltd | Construction | 2016 |
| Amaris Catering Ltd | Hospitality | 2026 |
| Amaris Homes Limited | Real estate | 2020 |
| Amass Digital Ltd | Professional & scientific | 2023 |
| Amatex Roofing Ltd | Construction | 2020 |
| Amazin.Club Ltd | Wholesale & retail | 2023 |
| Amazing People Schools Ltd | Administrative & support | 2008 |
| Ambelena Ltd | Financial services | 2013 |
| Amber Group Properties Limited | Real estate | 2023 |
| Amber Properties Northwest Limited | Construction | 2021 |
| Amber Vehicle Assessors Limited | Professional & scientific | 2011 |
| Ambertrace Limited | Construction | 1999 |
| AMC (UK) Limited | Wholesale & retail | 2001 |
| Amcgrathhealth Limited | Health & social care | 2023 |
| AMF Precision Engineering Limited | Manufacturing | 2008 |
| AMF Real Estate Limited | Real estate | 2017 |
| Amicus Consulting Limited | Administrative & support | 2025 |
| Amigos Fruto Limited | Real estate | 2019 |
| Amigos Vivo Ltd | Health & social care | 2021 |
| Amir Petroleum Ltd | Other services | 2017 |
| Amma's Kitchen (NW) Ltd | Hospitality | 2025 |
| Amnis RAE Limited | Real estate | 2018 |
| Amor Food Wirral Ltd | Hospitality | 2023 |
| Ampaweletz Ltd | Health & social care | 2026 |
| Ampersand Property Solutions Ltd | Real estate | 2024 |
| Ampervan Ltd | Information & communication | 2026 |
| Amptill Bedford Limited | Administrative & support | 2015 |
| AMR Management Services Ltd | Professional & scientific | 2023 |
| Amselina Ltd | Professional & scientific | 2023 |
| Amuse-Buge Limited | Arts & recreation | 2025 |
| Amvry Limited | Other services | 2016 |
| AMY Goddard Occupational Therapy Services Ltd | Health & social care | 2022 |
| AMY KAY Design Limited | Professional & scientific | 2020 |
| AN Health First Ltd | Health & social care | 2024 |
| Anamal Dance Company Ltd | Arts & recreation | 2012 |
| Anand Property Holdings Ltd | Real estate | 2024 |
| Andersons Accident Repair Specialists Ltd | Wholesale & retail | 2019 |
| Andoline Properties Limited | Real estate | 2014 |
| Andre's West Kirby Ltd | Hospitality | 2016 |
| Andrew Burrow Limited | Professional & scientific | 2013 |
| Andrew Dudley Limited | Extraterritorial | 2011 |
| Andrew Molloy Foot & Ankle Limited | Health & social care | 2025 |
| Andy's Aquatics Ltd | Wholesale & retail | 2012 |
| Anekanta AI Ltd | Administrative & support | 2021 |
| Angela Cliffe Consulting Ltd | Other services | 2019 |
| Angelyssa Consultancy Services PVT Ltd | Information & communication | 2025 |
| Anglo Swiss Maritime Company Limited | Transport & logistics | 1938 |
| Anglo Tajik Trading Company Limited | Wholesale & retail | 1970 |
| Anji Adams Marketing Consulting Limited | Professional & scientific | 2016 |
| ANM Property Consulting Limited | Professional & scientific | 2013 |
| Annai Natyalaya UK Limited | Arts & recreation | 2024 |
| Annd NOW 2 Limited | Extraterritorial | 2022 |
| Annecy Electronics Limited | Manufacturing | 1990 |
| Anodyne Air Inc. Ltd | Administrative & support | 2011 |
| Anritt Limited | Extraterritorial | 2015 |
| Anson RFP Limited | Health & social care | 2025 |
| Ansrm Ltd | Transport & logistics | 2003 |
| Antal Investments Limited | Real estate | 2017 |
| Antalya Nice Hair CUT Wirral Ltd | Other services | 2022 |