| Amplix Technologies Ltd | Information & communication | 2025 |
| Amplus Fortis Ltd | Professional & scientific | 2017 |
| Amplyfy Construct Ltd | Manufacturing | 2025 |
| Amplyfy Group Ltd | Other services | 2023 |
| Amqas Property Group Ltd | Financial services | 2025 |
| AMR Building Company Ltd | Construction | 2018 |
| AMR Investment Properties Ltd | Real estate | 2019 |
| Amra Future UK Ltd | Real estate | 2026 |
| Amri Consulting Ltd | Health & social care | 2026 |
| Amrin Resources Limited | Construction | 2014 |
| Amrs Properties Ltd | Real estate | 2018 |
| Amry Property Limited | Real estate | 2019 |
| AMS Acquisitions 1 Ltd | Real estate | 2020 |
| AMS Acquisitions 2 Ltd | Real estate | 2020 |
| AMS Automation Ltd | Administrative & support | 2012 |
| AMS Car Leasing Ltd | Administrative & support | 2020 |
| AMS Finance Ltd | Financial services | 2019 |
| AMS Pawnbrokers Limited | Administrative & support | 2009 |
| AMS Trade GB Ltd | Real estate | 2019 |
| AMT Capital Holdings Ltd | Construction | 2022 |
| AMT Services Group Ltd | Construction | 2021 |
| Amulet Norway Ltd | Administrative & support | 2010 |
| Amuncaster Holdings Ltd | Health & social care | 2016 |
| Amweld Limited | Professional & scientific | 2024 |
| AMY Beth Administration Services Ltd | Professional & scientific | 2026 |
| AMY Broadbent Aesthetics Ltd | Other services | 2022 |
| Amyu Services Ltd | Wholesale & retail | 2025 |
| AN Abundant Abode Ltd | Real estate | 2024 |
| AN Actions Common CIC | Other services | 2025 |
| ANA Transport Ltd | Transport & logistics | 2024 |
| Analysis Legal LLP | | 2014 |
| Analytiqa Limited | Professional & scientific | 2012 |
| Anar Partnership Limited | Real estate | 2020 |
| Anas Banun Ltd | Administrative & support | 2018 |
| Anatomy of Autonomy Ltd | Information & communication | 2018 |
| Anchor Commercial Management Ltd | Agriculture & fishing | 2022 |
| Anchor Exchange Ltd | Wholesale & retail | 2026 |
| Anchor Housing Solutions Limited | Real estate | 2025 |
| Anchor Real Investments Ltd | Real estate | 2023 |
| AND Data Limited | Administrative & support | 2013 |
| AND NOW This Ltd | Professional & scientific | 2014 |
| Andersen Relatum Consultant Ltd | Professional & scientific | 2022 |
| Anderson & Heritage Ltd | Wholesale & retail | 2025 |
| Anderson Engineering and Welding Services Ltd | Manufacturing | 2022 |
| Anderson Joinery & Building Limited | Construction | 2023 |
| Anderson Opal Limited | Administrative & support | 2025 |
| Anderson Property Management Limited | Real estate | 2015 |
| Andersons Foods Limited | Hospitality | 2017 |
| Andex Consult Limited | Wholesale & retail | 2018 |
| Andrew Brannan Wealth Management Ltd | Professional & scientific | 2020 |
| Andrew Camilleri ENT Limited | Health & social care | 2020 |
| Andrew Carson Ltd | Transport & logistics | 2024 |
| Andrew Durrant Consulting Limited | Professional & scientific | 2023 |
| Andrew Garner (Holdings) Limited | Financial services | 2015 |
| Andrew Jones HR Solutions Limited | Administrative & support | 2019 |
| Andrew Kane Limited | Agriculture & fishing | 1999 |
| Andrew Kaye (Manchester) Limited | Health & social care | 2005 |
| Andrew Lane Garage Limited | Administrative & support | 2006 |
| Andrew Lavender & Associates Limited | Health & social care | 2010 |
| Andrew Lyster Ltd | Professional & scientific | 2022 |
| Andrew Mercer Limited | Wholesale & retail | 1975 |
| Andrew Newby Consulting Ltd | Professional & scientific | 2012 |
| Andrew Shepley Building and Restoration Limited | Construction | 2019 |
| Andrew Smith Training & Consultancy Ltd. | Education | 2019 |
| Andrew Ward & Co. Ltd | Construction | 2010 |
| Andrews Associates Engineers Limited | Professional & scientific | 2021 |
| Andron Manufacturing Limited | Wholesale & retail | 2017 |
| Andy Doyle Ltd | Professional & scientific | 2025 |
| Andy Horan Motion Design Limited | Professional & scientific | 2020 |
| Andy Mcglasson Ltd | Arts & recreation | 2011 |
| Andy P Collins Wealth Management Limited | Financial services | 2018 |
| Andy Preston Events & Conferences Ltd | Other services | 2023 |
| Andy Preston Limited | Administrative & support | 2020 |
| Andy Saunders Limited | Information & communication | 2005 |
| Aneeqa Properties Ltd | Real estate | 2025 |
| Anees Enterprises UK Ltd | Wholesale & retail | 2025 |
| Anesca Talent Limited | Administrative & support | 2023 |
| Anesco Energy Services (South) Limited | Administrative & support | 2012 |
| Anew Wealth Management Ltd | Financial services | 2012 |
| ANF Electrical Services Ltd | Construction | 2019 |
| ANF Holdings MCR Ltd | Financial services | 2021 |
| ANF Retail Ltd | Other services | 2022 |
| Angel Business Property Limited | Households | 2024 |
| Angel Properties (Cheshire) Limited | Real estate | 2001 |
| Angela Beer Limited | Wholesale & retail | 2015 |
| Angela Harper Resourcing Limited | Administrative & support | 2005 |
| Angela MEE Limited | Other services | 2003 |
| Angela Race Consulting Limited | Professional & scientific | 2018 |
| Angela Sundust Ltd | Information & communication | 2021 |
| Angelo Turrisi Ltd | Arts & recreation | 2024 |
| Angitu Construction Ltd | Construction | 2019 |
| Anglezarke Limited | Professional & scientific | 2014 |
| Anglo American Antiques & Collectibles Ltd | Arts & recreation | 2001 |
| ANH Social Ltd | Information & communication | 2024 |
| Animate Education Ltd | Education | 2015 |
| Anisha Kothari Ltd | Wholesale & retail | 2025 |
| Anisha Locum Services Limited | Health & social care | 2022 |
| Anita RYE Limited | Professional & scientific | 2024 |
| Anjoman Limited | Other services | 2009 |
| Anmar Consulting Company Limited | Health & social care | 2005 |