| AMB Leisure Ltd | Wholesale & retail | 2013 |
| AMB Retail Limited | Wholesale & retail | 2020 |
| Ambato Limited | Real estate | 2020 |
| Amber Family Limited | Health & social care | 2013 |
| Ambient Construction Limited | Other services | 2018 |
| AMC Property Solutions Ltd | Real estate | 2015 |
| Amereb Corporate Law Limited | Professional & scientific | 2015 |
| American Actors UK | Information & communication | 2014 |
| AMG Newco Limited | Real estate | 2017 |
| Amit Ice Cream & Desserts Ltd | Manufacturing | 2024 |
| AMJ Counselling Ltd | Health & social care | 2015 |
| Ammarah Tech Services Ltd | Information & communication | 2019 |
| Ammonite Properties Ltd | Real estate | 2021 |
| Ammonite Solutions Ltd | Professional & scientific | 2018 |
| Amos Traffic Markings Ltd | Construction | 2003 |
| AMP Heating Ltd | Construction | 2020 |
| Amro Homes Limited | Real estate | 2018 |
| Amro Medical Ltd | Wholesale & retail | 2024 |
| AMS Reel Media Limited | Administrative & support | 2014 |
| Amstew Consultancy Limited | Other services | 2017 |
| Amtec Contractors Ltd | Construction | 2011 |
| Amuseko Ltd | Wholesale & retail | 2024 |
| AMY Louise Hair Limited | Other services | 2017 |
| ANA (Northwest) Ltd | Administrative & support | 2024 |
| Anasouthport Ltd | Wholesale & retail | 2024 |
| ANC Developments Limited | Construction | 2021 |
| Anchor MOT Station Hutton Limited | Wholesale & retail | 2014 |
| Anchorage Estates (Liverpool) Limited | Real estate | 2023 |
| Andama Consulting Ltd | Professional & scientific | 2025 |
| Andora Guesthouse Limited | Hospitality | 2024 |
| Andrea Bleackley & Co Limited | Professional & scientific | 2017 |
| Andreas Telecom Limited | Administrative & support | 2016 |
| Andrew Boyle Ltd | Health & social care | 2008 |
| Andrew Clarke Services Ltd | Transport & logistics | 2016 |
| Andrew Cunningham Building Design Limited | Professional & scientific | 2013 |
| Andrew Geddes Accountants Ltd | Professional & scientific | 2015 |
| Andrew Horner & SON Limited | Manufacturing | 1992 |
| Andrew Scott Frazer Ltd | Professional & scientific | 2006 |
| Andrews & Co Management Limited | Professional & scientific | 2025 |
| Andrews & Co Training Ltd | Education | 2025 |
| Andsome Group Ltd | Other services | 2019 |
| Andy Campbell & SON Recycling Ltd. | Administrative & support | 2020 |
| Andy Campbell Recycling (Wallasey) Ltd. | Extraterritorial | 2007 |
| Andy Campbell Recycling Limited | Water & waste | 2001 |
| Andy Christian Building Services & Maintenance Limited | Construction | 2020 |
| Andy Store Ltd | Wholesale & retail | 2025 |
| Angela Kerr Limited | Health & social care | 2014 |
| Angelic Nails Southport Ltd | Other services | 2024 |
| Angelz Prom & Evening Wear Limited | Wholesale & retail | 2024 |
| Anglo-Italian Chemometrics Limited | Professional & scientific | 2011 |
| Angloworld E-Solutions Limited | Wholesale & retail | 2025 |
| Animal Outfitters UK Ltd | Other services | 2021 |
| ANJ Estates Ltd | Real estate | 2023 |
| Annixx Limited | Administrative & support | 2017 |
| Anno Domini Publishing Limited | Information & communication | 1988 |
| ANR Engineering Services Ltd | Construction | 2014 |
| Anthony James Consultancy Ltd | Real estate | 2002 |
| Antonias News & Wines Ltd | Wholesale & retail | 2018 |
| Anvil Gym Limited | Real estate | 2022 |
| Anything ALL Trades Ltd | Construction | 2017 |
| Anzupharm Ltd | Health & social care | 2023 |
| Aonix Consulting Limited | Administrative & support | 2018 |
| Aonix Ltd. | Information & communication | 1996 |
| AP Caravan Services Limited | Manufacturing | 2012 |
| AP Interactive Ltd | Information & communication | 2025 |
| APC Rope Access Limited | Construction | 2009 |
| Apds Consulting UK Ltd | Professional & scientific | 2016 |
| Apex Aesthetics Limited | Health & social care | 2024 |
| Apex Management Solutions Group Ltd | Administrative & support | 2025 |
| APH Partners Ltd | Administrative & support | 2020 |
| APL Microsystems Limited | Professional & scientific | 2016 |
| Apnp Limited | Professional & scientific | 2014 |
| Apple Bridge Consultants Limited | Education | 2014 |
| Apple Core Consultancy Ltd | Education | 2019 |
| Apple Healthcare Products Limited | Health & social care | 2010 |
| Approve Land Ltd | Real estate | 2025 |
| Apricorn Emea Ltd | Wholesale & retail | 2016 |
| Apricot Investments Limited | Professional & scientific | 2015 |
| Aqualife (Leyland) Limited | Agriculture & fishing | 2003 |
| Aquaplast Limited | Financial services | 2017 |
| Aquarius Meditation Ltd | Information & communication | 2024 |
| Aquaspire Ltd | Information & communication | 2025 |
| Aquilux Wellness Ltd | Manufacturing | 2025 |
| AR Houghton Construction Ltd | Construction | 2025 |
| AR Johnson Plumbing & Heating Ltd | Construction | 2019 |
| AR Johnson Properties Ltd | Real estate | 2024 |
| AR Living Ltd | Real estate | 2020 |
| Araham Company Limited | Real estate | 2020 |
| ARB Brokers Holdings Limited | Financial services | 2017 |
| ARB International Limited | Financial services | 1989 |
| Arbitrum Ltd | Administrative & support | 2022 |
| Arborlight Ltd | Information & communication | 2023 |
| Arcade Project CIC | Arts & recreation | 2024 |
| Arcadia Court Flat Management (Southport) Limited | Hospitality | 1995 |
| Arcains Limited | Hospitality | 2019 |
| Arch Audio Services Ltd | Information & communication | 2023 |
| Arch Production Services Ltd | Arts & recreation | 2025 |
| Archita,S Food & Craft Ltd | Hospitality | 2020 |
| Arden and ROW Limited | Manufacturing | 2024 |
| Arete KMF Limited | Arts & recreation | 2020 |