| APB Chippy Ltd | Hospitality | 2025 |
| APB Services Ltd | Real estate | 2024 |
| Apex Instruments Limited | Manufacturing | 2022 |
| Apollo Laser Therapy Limited | Professional & scientific | 2025 |
| App Project Developments & Waste Limited | Water & waste | 2014 |
| Appearance Hair Ltd | Other services | 2018 |
| Apple P.P.E. Limited | Wholesale & retail | 2006 |
| Appleton Media Limited | Professional & scientific | 2014 |
| Appleton Village Store Ltd | Wholesale & retail | 2016 |
| Approved Move Limited | Construction | 2018 |
| APT Finance Ltd | Financial services | 2024 |
| Aqua IT Consultancy Ltd | Information & communication | 2019 |
| Aquaserv (Holdings) Limited | Financial services | 2022 |
| Aquaserv Limited | Water & waste | 2005 |
| Aquatherm Solutions NW Ltd | Households | 2026 |
| AR Livestock Services Limited | Manufacturing | 2018 |
| ARC HD Services Limited | Health & social care | 2010 |
| Arcania Limited | Administrative & support | 2011 |
| Arcell Limited | Real estate | 2026 |
| Arch Private Equity Ltd | Financial services | 2013 |
| Archive Bookkeeping Consultancy Ltd | Professional & scientific | 2023 |
| Arco Health Care Clinic Ltd | Health & social care | 2024 |
| Aremuh-Medica Ltd | Professional & scientific | 2019 |
| Arise Homes Limited | Real estate | 2025 |
| Arise Millennium Construction Limited | Administrative & support | 2018 |
| ARK Energy Solutions Ltd | Construction | 2025 |
| ARK Leak Detection Ltd. | Administrative & support | 2021 |
| ARK Property Care Ltd | Construction | 2025 |
| ARL Construction Limited | Construction | 2012 |
| Armor Car Lamps & Panels Ltd | Wholesale & retail | 2025 |
| Armour Management Ltd | Professional & scientific | 2018 |
| ARO Scientific Ltd | Manufacturing | 2021 |
| Aros Kitchen Widnes Ltd | Hospitality | 2025 |
| Around the Bends Motorcycle Tours Ltd | Administrative & support | 2023 |
| Arrow Studios Limited | Construction | 2019 |
| Art 4 Your Sake CIC | Education | 2025 |
| Artemis (Northern) Ltd | Financial services | 2013 |
| Artemis Defense Technologies UK Ltd | Professional & scientific | 2023 |
| ARW Electrics Limited | Administrative & support | 2016 |
| ARX Systems Ltd | Professional & scientific | 2014 |
| AS Lettings (Widnes) Limited | Real estate | 2019 |
| Asast Ltd | Hospitality | 2025 |
| Asch Property Management Ltd | Real estate | 2019 |
| Ashcroft Automotive Limited | Wholesale & retail | 2026 |
| Ashcroft Day Trips Ltd | Administrative & support | 2023 |
| Ashcroft MOT Station Limited | Wholesale & retail | 2007 |
| Ashcroft Travel Limited | Transport & logistics | 2003 |
| Ashley James Training & Transport Ltd | Transport & logistics | 2025 |
| Ashwood Partnerships Limited | Professional & scientific | 2011 |
| Ashworth Security Ltd | Administrative & support | 2025 |
| ASK ME Anything Limited | Administrative & support | 2020 |
| ASK Rational Solutions Limited | Information & communication | 2024 |
| Asocio Ltd | Administrative & support | 2024 |
| Aspire Lettings & Management Limited | Real estate | 2025 |
| Aspire Nest Limited | Real estate | 2025 |
| Asset Movers Ltd | Wholesale & retail | 2025 |
| Association for Contextual Behavioural Science Uk&I C.I.C. | Professional & scientific | 2018 |
| Assured Defence & Assessed Security Ltd | Administrative & support | 2025 |
| Assured Driving Staff Ltd | Administrative & support | 2025 |
| Astrium Energy UK Ltd | Mining & quarrying | 2024 |
| ATA (Asset Training Academy) Ltd | Education | 2020 |
| Athenrye Events Limited | Administrative & support | 2015 |
| Atkinson Assets Ltd | Real estate | 2023 |
| Atkinson Civil Engineering Limited | Construction | 2020 |
| Atlantics Limited | Professional & scientific | 2009 |
| ATM Landmark Limited | Construction | 2008 |
| Atmosphere M&E Ltd | Construction | 2018 |
| Atras Property Ltd | Real estate | 2019 |
| Atras Transport Ltd | Transport & logistics | 2015 |
| Attention to Detail Consultancy Ltd | Professional & scientific | 2020 |
| Attila Futas Transport Limited | Transport & logistics | 2014 |
| Austin LEO Properties Limited | Real estate | 2017 |
| Austin Richardson Limited | Construction | 2007 |
| Auto Salvage Recovery UK Limited | Real estate | 2014 |
| Autobitz Car Parts Ltd | Wholesale & retail | 2020 |
| Autolift Logistics Limited | Transport & logistics | 2016 |
| Autolift Recovery Limited | Transport & logistics | 2001 |
| Automation Everywhere Limited | Other services | 2015 |
| Automotive Plastic Collections Ltd | Wholesale & retail | 2025 |
| Autotec Northwest Ltd | Wholesale & retail | 2024 |
| Autotrailer Ltd | Manufacturing | 2024 |
| AV Managed Services Limited | Information & communication | 2025 |
| AV Sundries & Distribution Ltd | Wholesale & retail | 2021 |
| Avent Global Limited | Transport & logistics | 2023 |
| AVI4ALL Ltd | Wholesale & retail | 2017 |
| Avya Ltd | Other services | 2018 |
| AWB Plumbing & Heating Ltd | Construction | 2021 |
| AWT Commercials Limited | Wholesale & retail | 2006 |
| AX Global UK Limited | Wholesale & retail | 2014 |
| Axis Cleaning Facilities Ltd | Administrative & support | 2025 |
| Axle Care Solutions Ltd | Public administration | 2023 |
| AZB Solutions Limited | Administrative & support | 2022 |
| Aztec Coin Equipment Limited | Professional & scientific | 2002 |
| Azure Business Consulting Limited | Professional & scientific | 2020 |
| B & L School Cleaning Services Ltd | Administrative & support | 2024 |
| B J S Electrical Solutions Ltd | Construction | 2019 |
| B Mcfarlane Haulage Limited | Real estate | 2001 |
| Backhouse Developments (Merseyview) Ltd | Construction | 2017 |
| Backhouse Developments Ltd | Construction | 2012 |
| Backhouse Investments Ltd | Real estate | 2012 |