| Arrow Mill Management Ltd | Transport & logistics | 2015 |
| Arshad Brother & Co VEG Ltd | Wholesale & retail | 2017 |
| Arshad Health and Wellbeing Ltd | Health & social care | 2017 |
| Arslan Couriers Ltd | Transport & logistics | 2023 |
| Art of Developments Limited | Real estate | 2026 |
| Art of WAR Limited | Wholesale & retail | 2025 |
| Artbart Logistics Ltd | Transport & logistics | 2019 |
| Artful - Make IT Happen Ltd | Arts & recreation | 2018 |
| Arthur Thomas Ltd | Information & communication | 2025 |
| Artisan Alley Ltd | Wholesale & retail | 2023 |
| Artisan Granola Ltd | Manufacturing | 2023 |
| Artistic Property Designs Ltd | Real estate | 2019 |
| Arturtrucker Limited | Transport & logistics | 2016 |
| Arumba Ltd | Hospitality | 2019 |
| ARV Management Limited | Professional & scientific | 2021 |
| Arvaya Developments Ltd | Construction | 2025 |
| Arvaya Ltd | Construction | 2025 |
| ARW Traders Ltd | Wholesale & retail | 2018 |
| Arzak Ltd | Professional & scientific | 2026 |
| AS Care Solutions Limited | Health & social care | 2013 |
| AS28 Ltd | Information & communication | 2013 |
| ASA Express Transport Ltd | Transport & logistics | 2025 |
| Asap Heights Limited | Manufacturing | 2025 |
| Asarz Enterprise Limited | Wholesale & retail | 2013 |
| Asbestos Solutions North West Limited | Construction | 2019 |
| Ascj Ltd | Construction | 2013 |
| Ascot Business Services Limited | Professional & scientific | 2008 |
| ASD Media Ltd | Information & communication | 2021 |
| ASD Optometry Limited | Health & social care | 2021 |
| Asghar Property Management Ltd | Real estate | 2022 |
| Ash's Medical Organisation Limited | Health & social care | 2022 |
| Asham Care Limited | Health & social care | 2013 |
| Ashby & Crown Limited | Manufacturing | 2025 |
| Ashii INNERWORK101 Ltd | Administrative & support | 2024 |
| Ashworth Construction North Ltd | Construction | 2024 |
| Ashworth Convenience Store Limited | Wholesale & retail | 2026 |
| Ashworth Fold Limited | Households | 2023 |
| Ashworth Interim Solutions Ltd | Professional & scientific | 2021 |
| Ashworth R.V. Limited | Manufacturing | 2007 |
| Ashworth Springs Limited | Manufacturing | 2003 |
| Ashworth Valley Water Company Limited | Other services | 1993 |
| Asia Linens Global Ltd | Wholesale & retail | 2025 |
| Asia Linens Ltd | Wholesale & retail | 2022 |
| Asia Spotland Limited | Wholesale & retail | 2023 |
| Asif Exec Ltd | Transport & logistics | 2021 |
| ASK Builders Ltd | Construction | 2023 |
| ASK Electrical Solutions Ltd | Construction | 2019 |
| ASK Trading Ltd. | Manufacturing | 1988 |
| Askthetics Ltd | Health & social care | 2022 |
| ASL Syndicate Limited | Real estate | 2020 |
| Asla Investments Ltd | Real estate | 2025 |
| Asma Awais (AA) UK Enterprise Ltd | Wholesale & retail | 2018 |
| Asma Retail Ltd | Wholesale & retail | 2026 |
| Aspden & Middleton Properties Limited | Real estate | 1965 |
| Aspire 2 Inspire Communities CIC | Other services | 2019 |
| Aspire Brow Bar Ltd | Other services | 2024 |
| Aspire Child Care Ltd | Health & social care | 2009 |
| Associated Home Fabrics Limited | Wholesale & retail | 1955 |
| Association of Volunteer Managers Limited | Other services | 2007 |
| Asst Services Ltd | Construction | 2020 |
| Assured Referrals Limited | Financial services | 2013 |
| Assured Traffic Solutions Limited | Transport & logistics | 2021 |
| AST Accountancy Services Ltd | Professional & scientific | 2022 |
| AST Consultancy Ltd | Other services | 2016 |
| Astoncraft Holding Limited | Administrative & support | 2026 |
| Astoncraft Limited | Professional & scientific | 2008 |
| Astrology Enterprises Limited | Other services | 2006 |
| Asuk Limited | Wholesale & retail | 2024 |
| Aszp Investments Ltd | Real estate | 2024 |
| AT Autos Care Limited | Wholesale & retail | 2024 |
| Atec Print Limited | Manufacturing | 2009 |
| Atech Engine Specialists Ltd | Wholesale & retail | 2024 |
| ATF Enterprise Ltd | Hospitality | 2025 |
| ATF Traders Ltd | Wholesale & retail | 2026 |
| ATK Solutions Ltd | Other services | 2020 |
| Atkins Couriers Limited | Transport & logistics | 2007 |
| Atkinson Financial Planning Limited | Professional & scientific | 2020 |
| Atlanta Crispy Chicken Ltd | Hospitality | 2025 |
| Atlantic Executive Travel Ltd | Transport & logistics | 1999 |
| Atlantis Corporation (Imports) Ltd | Wholesale & retail | 2012 |
| Atlas Driving School Manchester Ltd | Transport & logistics | 2023 |
| ATM Cleaning Services Ltd | Administrative & support | 2022 |
| Atom Accountancy Services Limited | Professional & scientific | 2012 |
| ATS Accountants Ltd | Professional & scientific | 2014 |
| AUA Retail Outlet Limited | Wholesale & retail | 2018 |
| Auckland Group Ltd | Hospitality | 2026 |
| Auditr Limited | Professional & scientific | 2010 |
| AUR Group Ltd | Construction | 2025 |
| Aura Textiles Ltd | Wholesale & retail | 2026 |
| Auraspends Ltd | Wholesale & retail | 2026 |
| Aurelius Movers Ltd | Wholesale & retail | 2026 |
| Aureva Beauty Ltd | Wholesale & retail | 2025 |
| Aurora Data Holdings Limited | Information & communication | 2023 |
| Aurora Data Limited | Information & communication | 2016 |
| Aurora Engagements Limited | Other services | 2019 |
| Aurora International Properties Ltd | Real estate | 2022 |
| AUS Online Limited | Wholesale & retail | 2023 |
| Authoriti Limited | Information & communication | 2007 |
| Auto Carbodyshop Ltd | Wholesale & retail | 2024 |
| Auto Collisions Bury Ltd | Wholesale & retail | 2025 |